Columbia Funds Series Trust

Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 100 F Street, NE, Washington, DC 20549. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Columbia California Intermediate Municipal Bond Fund

Annual Report

April 30, 2024

In October 2022, the Securities and Exchange Commission (SEC) adopted a final rule, "Tailored Shareholder Reports for Mutual Funds and Exchange-Traded Funds; Fee Information in Investment Company Advertisements." The rule and form amendments will, among other things, require the Fund to transmit concise and visually engaging shareholder reports that highlight key information. The amendments will require that funds tag information in a structured data format and that certain more in-depth information be made available online and available for delivery free of charge to investors on request. The amendments became effective January 24, 2023. There is an 18-month transition period after the effective date of the amendments.

Each Tailored Shareholder Report will be share-class specific and will highlight key fund information the SEC believes is most relevant to investors in assessing their investment in the Fund. Much of the information, including a Fund’s financial statements, that is currently disclosed in a Fund’s shareholder reports will instead be made available on the Fund’s website and filed on Form N-CSR on an annual and semiannual basis. This information will be delivered to investors free of charge upon request. Columbia Fund reports will follow the Tailored Shareholder Report approach beginning with reports covering the period ending May 31, 2024.

The new rule also requires the Fund to mail a printed version of the Tailored Shareholder Report to all shareholders who have not elected to receive shareholder reports electronically. Rather than receiving a postcard notifying investors that the shareholder report for Funds in which they invest is available online, investors will begin receiving the Tailored Shareholder Report in the mail unless they have elected to receive their Fund documents electronically.

Not FDIC or NCUA Insured

No Financial Institution Guarantee

May Lose Value

Table of Contents

Fund at a Glance	3
Manager Discussion of Fund Performance	5
Understanding Your Fund’s Expenses	8
Portfolio of Investments	9
Statement of Assets and Liabilities	19
Statement of Operations	20
Statement of Changes in Net Assets	21
Financial Highlights	24
Notes to Financial Statements	28
Report of Independent Registered Public Accounting Firm	37
Federal Income Tax Information	38
Trustees and Officers	38
Liquidity Risk Management Program	44

If you elect to receive the shareholder report for Columbia California Intermediate Municipal Bond Fund (the Fund) in paper, mailed to you, the Fund mails one shareholder report to each shareholder address, unless such shareholder elects to receive shareholder reports from the Fund electronically via e-mail or by having a paper notice mailed to you (Postcard Notice) that your Fund’s shareholder report is available at the Columbia funds’ website (columbiathreadneedleus.com/investor/). If you would like more than one report in paper to be mailed to you, or would like to elect to receive reports via e-mail or access them through Postcard Notice, please call shareholder services at 800.345.6611 and additional reports will be sent to you.

Proxy voting policies and procedures

The policy of the Board of Trustees is to vote the proxies of the companies in which the Fund holds investments consistent with the procedures as stated in the Statement of Additional Information (SAI). You may obtain a copy of the SAI without charge by calling 800.345.6611; contacting your financial intermediary; visiting columbiathreadneedleus.com/investor/; or searching the website of the Securities and Exchange Commission (SEC) at sec.gov. Information regarding how the Fund voted proxies relating to portfolio securities is filed with the SEC by August 31st for the most recent 12-month period ending June 30th of that year, and is available without charge by visiting columbiathreadneedleus.com/investor/, or searching the website of the SEC at sec.gov.

Quarterly schedule of investments

The Fund files a complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-PORT. The Fund’s Form N-PORT filings are available on the SEC’s website at sec.gov. The Fund’s complete schedule of portfolio holdings, as filed on Form N-PORT, is available on columbiathreadneedleus.com/investor/ or can also be obtained without charge, upon request, by calling 800.345.6611.

Additional Fund information

For more information about the Fund, please visit columbiathreadneedleus.com/investor/ or call 800.345.6611. Customer Service Representatives are available to answer your questions Monday through Friday from 8 a.m. to 7 p.m. Eastern time.

Fund investment manager

Columbia Management Investment Advisers, LLC (the Investment Manager)

290 Congress Street

Boston, MA 02210

Fund distributor

Columbia Management Investment Distributors, Inc.

290 Congress Street

Boston, MA 02210

Fund transfer agent

Columbia Management Investment Services Corp.

P.O. Box 219104

Kansas City, MO 64121-9104

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Fund at a Glance

(Unaudited)

Investment objective

The Fund seeks current income exempt from U.S. federal income tax and California individual income tax, consistent with moderate fluctuation of principal.

Portfolio management

Paul Fox, CFA

Co-Portfolio Manager

Managed Fund since 2012

Douglas Rangel, CFA

Co-Portfolio Manager

Managed the Fund since 2022

Average annual total returns (%) (for the period ended April 30, 2024)
		Inception	1 Year	5 Years	10 Years
Class A	Excluding sales charges	09/09/02	1.85	0.82	1.77
	Including sales charges		-1.17	0.22	1.46
Advisor Class		03/19/13	2.21	1.09	2.03
Institutional Class		08/19/02	2.21	1.09	2.03
Institutional 2 Class		11/08/12	2.12	1.11	2.08
Institutional 3 Class*		03/01/17	2.28	1.18	2.10
Bloomberg California 3-15 Year Blend Municipal Bond Index			1.69	1.26	2.11
Bloomberg 3-15 Year Blend Municipal Bond Index			1.75	1.37	2.22

Returns for Class A shares are shown with and without the maximum initial sales charge of 3.00%. The Fund’s other share classes are not subject to sales charges and have limited eligibility. Please see the Fund’s prospectus for details. Performance for different share classes will vary based on differences in sales charges and fees associated with each share class. All results shown assume reinvestment of distributions during the period. Returns do not reflect the deduction of taxes that a shareholder may pay on Fund distributions or on the redemption of Fund shares. Performance results reflect the effect of any fee waivers or reimbursements of Fund expenses by Columbia Management Investment Advisers, LLC and/or any of its affiliates. Absent these fee waivers or expense reimbursement arrangements, performance results would have been lower.

The performance information shown represents past performance and is not a guarantee of future results. The investment return and principal value of your investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost. Current performance may be lower or higher than the performance information shown. You may obtain performance information current to the most recent month-end by contacting your financial intermediary, visiting columbiathreadneedleus.com/investor/ or calling 800.345.6611.

The returns shown for periods prior to the share class inception date (including returns for the Life of the Fund, if shown, which are since Fund inception) include the returns of the Fund’s oldest share class. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit columbiathreadneedleus.com/investor/investment-products/mutual-funds/appended-performance for more information.

The Bloomberg California 3-15 Year Blend Municipal Bond Index is an unmanaged index that tracks the performance of investment-grade bonds issued from the state of California and its municipalities.

The Bloomberg 3–15 Year Blend Municipal Bond Index is an unmanaged index that tracks the performance of municipal bonds issued after December 31, 1990, with remaining maturities between 2 and 17 years and at least $7 million in principal amount outstanding.

Indices are not available for investment, are not professionally managed and do not reflect sales charges, fees, brokerage commissions, taxes or other expenses of investing. Securities in the Fund may not match those in an index.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Fund at a Glance (continued)

(Unaudited)

Performance of a hypothetical $10,000 investment (April 30, 2014 — April 30, 2024)

The chart above shows the change in value of a hypothetical $10,000 investment in Class A shares of Columbia California Intermediate Municipal Bond Fund during the stated time period, and does not reflect the deduction of taxes that a shareholder may pay on Fund distributions or on the redemption of Fund shares.

Quality breakdown (%) (at April 30, 2024)
AAA rating	1.1
AA rating	51.0
A rating	28.0
BBB rating	12.0
BB rating	1.3
Not rated	6.6
Total	100.0

Percentages indicated are based upon total fixed income investments.

Bond ratings apply to the underlying holdings of the Fund and not the Fund itself and are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily. The ratings assigned by credit rating agencies are but one of the considerations that the Investment Manager and/or Fund’s subadviser incorporates into its credit analysis process, along with such other issuer-specific factors as cash flows, capital structure and leverage ratios, ability to de-leverage (repay) through free cash flow, quality of management, market positioning and access to capital, as well as such security-specific factors as the terms of the security (e.g., interest rate and time to maturity) and the amount and type of any collateral.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Manager Discussion of Fund Performance

(Unaudited)

For the 12-month period that ended April 30, 2024, Class A shares of Columbia California Intermediate Municipal Bond Fund returned 1.85% excluding sales charges. Institutional Class shares of the Fund returned 2.21%. The Fund’s primary benchmark, the Bloomberg California 3-15 Year Blend Municipal Bond Index (Bloomberg Index), returned 1.69% for the same period. To compare, the Bloomberg 3-15 Year Blend Municipal Bond Index, which is national in scope, returned 1.75% for the same period.

Market overview

During the annual period, the municipal bond market, and fixed-income markets broadly, experienced notable volatility, as concerns around rising inflation and the U.S. Federal Reserve (Fed) continuing to raise interest rates dominated investor sentiment. Also weighing on the market were high short-term interest rates, such as those on savings accounts and certificates of deposit, which kept investors from extending out their fixed-income investments and which contributed to outflows from municipal bond mutual funds, although the latter trend began to reverse in the first months of 2024.

As the annual period began in May 2023, both U.S. Treasury and municipal bond yields rose, as the regional banking crisis abated and the focus on the Fed’s tightening monetary policy reignited. The municipal bond market was relatively flat in these two months, with lower quality bonds outperforming their higher quality counterparts, and longer maturity bonds generally outpacing shorter maturity bonds. Both the U.S. Treasury and municipal bond markets experienced a significant sell-off during the third quarter of 2023. The 10-year U.S. Treasury yield rose 73 basis points. (A basis point is 1/100 of a percent.) Municipal yields followed a similar but more pronounced path, with 10-year yields increasing 89 basis points. Indeed, U.S. Treasury and municipal yields reached multi-year highs, as inflation remained stubbornly elevated despite the Fed’s aggressive rate hiking cycle. Amid this backdrop, the municipal bond market underperformed U.S. Treasuries. Longer-term municipal bonds, with their greater interest rate sensitivity, underperformed their shorter-term counterparts. The municipal bond market then experienced a significant rally in the fourth quarter of 2023, lifting the Bloomberg Municipal Bond Index to finish calendar year 2023 with one of its better years since the Great Financial Crisis of 2008-9. The roller coaster continued with the municipal bond market experiencing a sell-off in the first four months of 2024. Uncertainty around the direction of Fed policy, ongoing strength of the U.S. economy and labor market, and the direction and staying power of inflation pushed consensus expectations for both the timing and number of potential interest rate cuts out to later in 2024. Yields across both the U.S. Treasury and municipal bond yield curves increased.

For the annual period overall, most state and local governments were in healthy financial positions, with many boasting record surpluses. Many revenue segments were equally healthy, and while the pace of ratings agencies’ upgrades slowed from the COVID stimulus-induced flurry of activity we saw in the prior annual period, upgrades still outpaced downgrades during the annual period ended April 30, 2024. Even within sectors that have been slower to recover, such as health care and higher education, we saw signs of stabilization and opportunities to add value via skilled credit selection. As a whole, lower quality municipal bonds outperformed higher quality securities during the annual period. That said, there was significant dispersion among different quality and maturity segments of the municipal bond market. For example, as measured by the Bloomberg Municipal Bond Index, BBB-rated issues posted a return of 4.30% for the annual period, while AAA-rated municipal bonds gained 1.37%. Similarly, municipal bonds with maturities of one- to two-years and long-term bonds with maturities of 22 years and longer returned 2.73% and 2.53%, respectively. Shorter/intermediate maturity municipal bonds gained more modestly, with the three-year and five-year market segments returning 1.90% and 1.58%, respectively.

Municipal bond supply during the annual period was more robust than the market anticipated, particularly in the first four months of 2024, which as of April 30, was approximately 30% higher than during the same period one year prior. While historically an influx of supply might push yields higher or spreads (yield differentials to duration-equivalent AAA-rated municipal bonds) wider, new supply during the annual period was met with strong demand. Driven partly by separately managed account buyers and partly by modest inflows into municipal bond funds, the increase in supply was easily digested by the municipal bond market. Lower quality and high yield municipal bond supply, which has been scarce in recent years, was met with especially strong demand.

California’s economy performed generally in line with national trends during the annual period, but there was some softness showing with its March 2024 unemployment rate of 5.3%, one of the highest in the nation. State Gross Domestic Product grew at about 6% during the annual period, with the state’s economy remaining the fifth largest in the world for the seventh consecutive year. The combination of California’s high dependence on high earners and capital gains resulted in a large

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Manager Discussion of Fund Performance (continued)

(Unaudited)

decline in tax revenues through its fiscal year 2023 and into fiscal year 2024, which resulted in a sizable budget deficit projection. The state has been prudently building up budget reserves to near record levels and approaching the deficit from a position of fiscal strength and flexibility. The California governor and legislature have been focused on resolving the deficit, which will likely be a multi-year process. No public rating agency had downgraded the state at the end of April 2024, but depending on how the state responds to the deficit, there could be some minor downgrade pressure on the state’s credit profile. That said, at the end of the annual period, we expected the state to manage through the deficit without severe credit erosion, as we do not believe this is a redux of the challenges California faced in the aftermath of the 2008-9 financial crisis.

For the annual period as a whole, the broad municipal bond market significantly outperformed U.S. Treasuries and the broad U.S. fixed-income market. The Bloomberg Municipal Bond Index returned 2.08% as compared to a -2.80% return for the Bloomberg Treasury Index and a -1.47% return for the Bloomberg U.S. Aggregate Bond Index. The broad California municipal bond market, as measured by the Bloomberg California Municipal Bond Index, returned 2.08% for the annual period.

The Fund’s notable contributors during the period

•

Duration and yield curve positioning contributed most positively to the Fund’s relative results during the annual period.

○

Shorter duration positioning relative to the Bloomberg Index proved beneficial as municipal bond yields rose during the annual period.

○

Having a rather barbelled yield curve positioning was also additive, as shorter maturity bonds, i.e., zero to two years, and longer intermediate maturities, i.e., 10 to 15 years, performed better than bonds with maturities in between.

○

The Fund’s duration was below that of the Bloomberg Index for most of the annual period by as much as approximately 0.50 years. We began lengthening the Fund’s duration in October 2023 after the selloff and ended the annual period with the Fund’s duration essentially neutral to that of the Bloomberg Index.

•

Credit quality positioning overall added value to the Fund’s relative results. Being overweight to lower investment-grade issues rated A and BBB and to select non-rated issues proved helpful, as they outperformed higher rated issues during the annual period. Spreads tightened during the annual period as the economy remained resilient and market sentiment embraced a soft landing for the economy. With that comfort in the economy, investors pursued lower-rated revenue sectors.

•

Sector allocation positioning overall further buoyed the Fund’s relative results. More specifically, having an overweighted allocation to the transportation sector and an underweighted allocation to California state general obligation bonds contributed positively.

The Fund’s notable detractors during the period

•

Having an underweighted exposure to bonds with 4% coupons detracted, as they outperformed their more prevalent 5% coupon counterparts. Notably, bonds with 4% coupons performed especially well in November and December 2023 when yields fell. In general, these bonds appreciated rapidly from discounts (below par) to premiums (above par) during those two months.

•

Having overweighted allocations to the water & sewer and special tax sectors detracted, as both sectors underperformed the Bloomberg Index during the annual period. These sectors tend to be of higher quality, which lagged lower quality sectors during the annual period. Within the special tax sector, sales tax-backed issues in the state lagged the overall market.

Fixed-income securities present issuer default risk. The Fund invests substantially in municipal securities and will be affected by tax, legislative, regulatory, demographic or political changes, as well as changes impacting a state’s financial, economic or other conditions. A relatively small number of tax-exempt issuers may necessitate the Fund investing more heavily in a single issuer and, therefore, be more exposed to the risk of loss than a fund that invests more broadly. The value of the Fund’s portfolio may be more volatile than a more geographically diversified fund. Prepayment and extension risk exists because the timing of payments on a loan, bond or other investment may accelerate when interest rates fall or decelerate when interest rates rise which may reduce investment opportunities and potential returns. A rise in interest rates may result in a price decline of fixed-income instruments held by the Fund, negatively impacting its performance and NAV. Falling rates may result in the Fund investing in lower yielding debt instruments, lowering the Fund’s income and yield. These risks may be heightened for longer maturity and duration securities. Non-investment-grade (high-yield or junk) securities present greater price volatility

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Manager Discussion of Fund Performance (continued)

(Unaudited)

and more risk to principal and income than higher rated securities. Market risk may affect a single issuer, sector of the economy, industry or the market as a whole. Federal and state tax rules apply to capital gain distributions and any gains or losses on sales. Income may be subject to state or local taxes. Liquidity risk is associated with the difficulty of selling investments at a desirable time or price. See the Fund’s prospectus for more information on these and other risks.

The views expressed in this report reflect the current views of the respective parties who have contributed to this report. These views are not guarantees of future performance and involve certain risks, uncertainties and assumptions that are difficult to predict, so actual outcomes and results may differ significantly from the views expressed. These views are subject to change at any time based upon economic, market or other conditions and the respective parties disclaim any responsibility to update such views. These views may not be relied on as investment advice and, because investment decisions for a Columbia fund are based on numerous factors, may not be relied on as an indication of trading intent on behalf of any particular Columbia fund. References to specific securities should not be construed as a recommendation or investment advice.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Understanding Your Fund’s Expenses

(Unaudited)

As an investor, you incur two types of costs. There are shareholder transaction costs, which generally include sales charges on purchases and may include redemption fees. There are also ongoing fund costs, which generally include management fees, distribution and/or service fees, and other fund expenses. The following information is intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to help you compare these costs with the ongoing costs of investing in other mutual funds.

Analyzing your Fund’s expenses

To illustrate these ongoing costs, we have provided examples and calculated the expenses paid by investors in each share class of the Fund during the period. The actual and hypothetical information in the table is based on an initial investment of $1,000 at the beginning of the period indicated and held for the entire period. Expense information is calculated two ways and each method provides you with different information. The amount listed in the “Actual” column is calculated using the Fund’s actual operating expenses and total return for the period. You may use the Actual information, together with the amount invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the results by the expenses paid during the period under the “Actual” column. The amount listed in the “Hypothetical” column assumes a 5% annual rate of return before expenses (which is not the Fund’s actual return) and then applies the Fund’s actual expense ratio for the period to the hypothetical return. You should not use the hypothetical account values and expenses to estimate either your actual account balance at the end of the period or the expenses you paid during the period. See “Compare with other funds” below for details on how to use the hypothetical data.

Compare with other funds

Since all mutual funds are required to include the same hypothetical calculations about expenses in shareholder reports, you can use this information to compare the ongoing cost of investing in the Fund with other funds. To do so, compare the hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of other funds. As you compare hypothetical examples of other funds, it is important to note that hypothetical examples are meant to highlight the ongoing costs of investing in a fund only and do not reflect any transaction costs, such as sales charges, or redemption or exchange fees. Therefore, the hypothetical calculations are useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds. If transaction costs were included in these calculations, your costs would be higher.

November 1, 2023 — April 30, 2024
	Account value at the beginning of the period ($)		Account value at the end of the period ($)		Expenses paid during the period ($)		Fund’s annualized expense ratio (%)
	Actual	Hypothetical	Actual	Hypothetical	Actual	Hypothetical	Actual
Class A	1,000.00	1,000.00	1,048.80	1,021.23	3.72	3.67	0.73
Advisor Class	1,000.00	1,000.00	1,051.30	1,022.48	2.45	2.41	0.48
Institutional Class	1,000.00	1,000.00	1,050.20	1,022.48	2.45	2.41	0.48
Institutional 2 Class	1,000.00	1,000.00	1,050.40	1,022.53	2.40	2.36	0.47
Institutional 3 Class	1,000.00	1,000.00	1,050.50	1,022.77	2.14	2.11	0.42

Expenses paid during the period are equal to the annualized expense ratio for each class as indicated above, multiplied by the average account value over the period and then multiplied by the number of days in the Fund’s most recent fiscal half year and divided by 366.

Expenses do not include fees and expenses incurred indirectly by the Fund from its investment in underlying funds, including affiliated and non-affiliated pooled investment vehicles, such as mutual funds and exchange-traded funds.

Had Columbia Management Investment Advisers, LLC and/or certain of its affiliates not waived/reimbursed certain fees and expenses, account value at the end of the period would have been reduced.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments

April 30, 2024

(Percentages represent value of investments compared to net assets)

Investments in securities

Floating Rate Notes 0.4%
Issue Description	Yield	Principal Amount ($)	Value ($)
Variable Rate Demand Notes 0.4%
New York City Transitional Finance Authority(a),(b)
Revenue Bonds
Future Tax Secured
Subordinated Series 2018 (JPMorgan Chase Bank)
08/01/2042	3.800%	1,000,000	1,000,000
Total Floating Rate Notes (Cost $1,000,000)			1,000,000

Municipal Bonds 99.6%
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Airport 13.4%
City of Los Angeles Department of Airports(c)
Refunding Revenue Bonds
Series 2018B
05/15/2028	5.000%	2,000,000	2,115,292
Revenue Bonds
Los Angeles International Airport
Subordinated Series 2019
05/15/2038	5.000%	3,500,000	3,644,408
City of Los Angeles Department of Airports
Refunding Revenue Bonds
Subordinated Series 2015C
05/15/2029	5.000%	2,410,000	2,453,063
Subordinated Series 2019
05/15/2035	5.000%	1,485,000	1,634,723
05/15/2037	5.000%	840,000	914,160
Revenue Bonds
Subordinated Series 2017B
05/15/2029	5.000%	330,000	350,480
05/15/2030	5.000%	500,000	531,195
County of Sacramento Airport System(c)
Refunding Revenue Bonds
Series 2018C
07/01/2028	5.000%	3,090,000	3,252,247
County of Sacramento Airport System
Refunding Revenue Bonds
Subordinated Series 2016B
07/01/2036	5.000%	1,750,000	1,805,246
Subordinated Series 2018E
07/01/2029	5.000%	1,035,000	1,113,494
07/01/2034	5.000%	1,000,000	1,076,473
San Diego County Regional Airport Authority
Refunding Revenue Bonds
Subordinated Series 2017A
07/01/2033	5.000%	1,000,000	1,059,241
07/01/2034	5.000%	700,000	741,273

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
San Diego County Regional Airport Authority(c)
Refunding Revenue Bonds
Subordinated Series 2019B
07/01/2036	5.000%	1,540,000	1,622,089
Subordinated Series 2020
07/01/2036	5.000%	495,000	525,926
07/01/2039	5.000%	400,000	418,097
Revenue Bonds
Subordinated Series 2021B
07/01/2039	4.000%	250,000	243,347
San Francisco City & County Airport Commission - San Francisco International Airport
Refunding Revenue Bonds
2nd Series 2016A
05/01/2026	5.000%	1,975,000	2,045,869
San Francisco Airport Commission Project
Series 2019
05/01/2036	5.000%	3,205,000	3,503,975
San Francisco City & County Airport Commission - San Francisco International Airport(c)
Revenue Bonds
Series 2019E
05/01/2037	5.000%	4,450,000	4,666,495
San Francisco City & County Airport Commission-San Francisco International Airport(c)
Refunding Revenue Bonds
Second Series 2023C
05/01/2037	5.500%	1,750,000	1,983,688
Revenue Bonds
Series 2019A
05/01/2038	5.000%	1,470,000	1,533,839
Total			37,234,620
Charter Schools 4.6%
California Infrastructure & Economic Development Bank
Revenue Bonds
Equitable School Revolving Fund
Series 2019
11/01/2039	5.000%	275,000	288,544
California School Finance Authority(d)
Refunding Revenue Bonds
Aspire Public Schools
Series 2016
08/01/2030	5.000%	1,380,000	1,394,231
08/01/2031	5.000%	850,000	858,473
Revenue Bonds
Alliance College-Ready Public Schools
Series 2015
07/01/2030	5.000%	3,400,000	3,425,841
Aspire Public Schools Obligation Group
Series 2021
08/01/2036	4.000%	325,000	308,886

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Green Dot Public School Project
Series 2015A
08/01/2035	5.000%	1,010,000	1,019,461
Series 2018
08/01/2038	5.000%	1,000,000	1,011,353
KIPP Los Angeles Projects
Series 2015A
07/01/2035	5.000%	1,250,000	1,268,171
Series 2017
07/01/2037	5.000%	3,090,000	3,170,984
Total			12,745,944
Disposal 0.6%
California Municipal Finance Authority(c)
Revenue Bonds
Republic Services, Inc.
Series 2024 (Mandatory Put 03/01/24)
02/28/2054	3.875%	1,000,000	992,255
California Municipal Finance Authority(c),(e)
Revenue Bonds
Republic Services, Inc. Project
Series 2023 (Mandatory Put 09/01/33)
09/01/2053	4.375%	750,000	770,044
Total			1,762,299
Higher Education 8.0%
California Educational Facilities Authority
Refunding Revenue Bonds
Loma Linda University
Series 2017A
04/01/2034	5.000%	1,485,000	1,539,729
04/01/2035	5.000%	2,000,000	2,072,824
Series 2018-A
12/01/2036	5.000%	1,000,000	1,044,486
Revenue Bonds
Chapman University
Series 2015
04/01/2026	5.000%	1,000,000	1,012,281
Green Bonds - Loyola Marymount University
Series 2018
10/01/2036	5.000%	760,000	803,803
California Municipal Finance Authority
Refunding Revenue Bonds
Azusa Pacific University
Series 2015B
04/01/2025	5.000%	395,000	392,809
04/01/2026	5.000%	1,000,000	991,425

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Biola University
Series 2017
10/01/2031	5.000%	540,000	560,773
10/01/2032	5.000%	615,000	637,920
10/01/2033	5.000%	625,000	647,537
10/01/2034	5.000%	570,000	589,915
California Lutheran University
Series 2018
10/01/2035	5.000%	225,000	233,633
10/01/2036	5.000%	250,000	258,431
Revenue Bonds
National University
Series 2019A
04/01/2035	5.000%	1,780,000	1,901,939
04/01/2036	5.000%	1,120,000	1,192,128
California Municipal Finance Authority(d)
Revenue Bonds
California Baptist University
Series 2016A
11/01/2026	4.000%	750,000	740,620
California State University
Revenue Bonds
Series 2023A
11/01/2041	5.000%	1,000,000	1,123,897
California Statewide Communities Development Authority(d)
Refunding Revenue Bonds
California Baptist University
Series 2017A
11/01/2032	5.000%	1,135,000	1,158,181
University of California
Refunding Revenue Bonds
Series 2023BN
05/15/2039	5.000%	2,500,000	2,834,240
Series 2024BS
05/15/2038	5.000%	2,000,000	2,309,936
Total			22,046,507
Hospital 7.0%
California Health Facilities Financing Authority
Refunding Revenue Bonds
El Camino Hospital
Series 2015A
02/01/2027	5.000%	1,500,000	1,517,493
Scripps Health
Series 2024A
11/15/2039	5.000%	2,000,000	2,267,751
Sutter Health
Series 2017A
11/15/2033	5.000%	1,000,000	1,057,901

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Revenue Bonds
Children’s Hospital of Orange County
Series 2024
11/01/2042	5.000%	500,000	557,805
El Camino Hospital
Series 2017
02/01/2033	5.000%	2,500,000	2,620,381
02/01/2034	5.000%	500,000	524,162
Kaiser Permanente
Subordinated Series 2017A-1-G
11/01/2027	5.000%	1,875,000	2,005,632
Lucile Salter Packard Children’s Hospital
Series 2017
11/15/2034	5.000%	250,000	265,052
11/15/2035	5.000%	270,000	285,675
Sutter Health
Series 2018A
11/15/2034	5.000%	1,000,000	1,056,433
California Statewide Communities Development Authority
Revenue Bonds
Green - Marin General Hospital Project
Series 2018
08/01/2033	5.000%	425,000	438,371
08/01/2034	5.000%	650,000	671,570
Methodist Hospital of Southern California
Series 2018
01/01/2036	5.000%	3,000,000	3,195,359
California Statewide Communities Development Authority(e)
Revenue Bonds
Kaiser Permanente
Series 2019 (Mandatory Put 11/01/29)
04/01/2036	5.000%	1,410,000	1,539,314
City of Upland
Refunding Certificate of Participation
San Antonio Regional Hospital
Series 2017
01/01/2034	5.000%	500,000	518,819
01/01/2036	4.000%	1,000,000	953,590
Total			19,475,308
Human Service Provider 0.4%
California Municipal Finance Authority
Refunding Revenue Bonds
Harbor Regional Center Project
Series 2015
11/01/2032	5.000%	1,120,000	1,140,339

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Joint Power Authority 2.0%
Northern California Transmission Agency
Refunding Revenue Bonds
California-Oregon Project
Series 2016
05/01/2032	5.000%	1,500,000	1,557,087
Southern California Public Power Authority(f)
Revenue Bonds
Southern Transmission System
Series 2024
07/01/2041	5.000%	3,550,000	4,014,762
Total			5,571,849
Local Appropriation 2.5%
Anaheim Public Financing Authority
Refunding Revenue Bonds
Anaheim Public Improvement Projects
Series 2019 BAM
09/01/2031	5.000%	1,470,000	1,601,305
Fresno Joint Powers Financing Authority
Refunding Revenue Bonds
Master Lease Project
Series 2017A (AGM)
04/01/2033	5.000%	1,000,000	1,053,390
Los Angeles County Public Works Financing Authority
Revenue Bonds
Green Bonds - LACMA Building for the Permanent Collection Project
Series 2020A
12/01/2037	4.000%	2,415,000	2,499,583
San Rafael Joint Powers Financing Authority
Revenue Bonds
Public Safety Facilities Project
Series 2018
06/01/2033	5.000%	850,000	921,941
06/01/2034	5.000%	775,000	840,370
Total			6,916,589
Local General Obligation 8.1%
Bellevue Union School District(g)
Unlimited General Obligation Bonds
Capital Appreciation - Election of 2008
Series 2011A (AGM)
08/01/2030	0.000%	585,000	472,047
08/01/2031	0.000%	615,000	478,685
City of San Jose
Unlimited General Obligation Bonds
Series 2021A
09/01/2040	5.000%	1,000,000	1,108,808
Conejo Valley Unified School District
Unlimited General Obligation Bonds
Series 2018B
08/01/2032	4.000%	2,000,000	2,063,983

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Corona-Norco Unified School District
Unlimited General Obligation Bonds
Election of 2014
Series 2018B
08/01/2034	4.000%	500,000	520,816
Encinitas Union School District(e)
Unlimited General Obligation Bonds
Capital Appreciation - Election of 2010
Series 2011
08/01/2035	6.750%	500,000	647,694
Long Beach Unified School District(g)
Unlimited General Obligation Bonds
Series 2015D-1
08/01/2031	0.000%	1,375,000	1,028,886
Los Angeles Unified School District
Unlimited General Obligation Bonds
Election of 2008
Series 2018B-1
07/01/2032	5.000%	4,000,000	4,266,601
Monterey Peninsula Community College District(g)
Unlimited General Obligation Refunding Bonds
Series 2016
08/01/2028	0.000%	2,125,000	1,838,344
Napa Valley Community College District(e)
Unlimited General Obligation Refunding Bonds
Series 2018
08/01/2034	4.000%	1,595,000	1,613,837
Oakland Unified School District/Alameda County
Unlimited General Obligation Bonds
Series 2015A
08/01/2025	5.000%	650,000	662,920
Pomona Unified School District(g)
Unlimited General Obligation Bonds
Election of 2008
Series 2016G (AGM)
08/01/2032	0.000%	1,000,000	750,974
Rancho Santiago Community College District(g)
Unlimited General Obligation Bonds
Capital Appreciation - Election of 2002
Series 2006C (AGM)
09/01/2031	0.000%	3,785,000	2,958,215
Rescue Union School District(g)
Unlimited General Obligation Bonds
Capital Appreciation - Election of 1998
Series 2005 (NPFGC)
09/01/2026	0.000%	1,100,000	1,012,445
Santa Monica Community College District
Unlimited General Obligation Bonds
Election of 2016
Series 2018A
08/01/2034	4.000%	500,000	517,982

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Sierra Kings Health Care District
Unlimited General Obligation Refunding Bonds
Series 2015
08/01/2028	5.000%	1,000,000	1,008,933
08/01/2032	5.000%	1,500,000	1,514,836
Total			22,466,006
Multi-Family 1.1%
California Housing Finance
Revenue Bonds
Series 2019-2 Class A
03/20/2033	4.000%	1,114,718	1,109,760
California Municipal Finance Authority
Revenue Bonds
Bowles Hall Foundation
Series 2015A
06/01/2035	5.000%	400,000	404,206
California Statewide Communities Development Authority
Revenue Bonds
Lancer Educational Student Housing Project
Series 2019
06/01/2034	5.000%	375,000	385,474
Series 2017
05/15/2032	5.000%	1,000,000	1,030,800
Total			2,930,240
Municipal Power 8.1%
City of Redding Electric System
Refunding Revenue Bonds
Series 2017
06/01/2029	5.000%	1,250,000	1,323,373
City of Riverside Electric
Refunding Revenue Bonds
Series 2019A
10/01/2037	5.000%	1,000,000	1,082,694
City of Vernon Electric System
Refunding Revenue Bonds
Series 2022A
08/01/2039	5.000%	425,000	447,609
Los Angeles Department of Water & Power
Refunding Revenue Bonds
Power System
Series 2017B
07/01/2029	5.000%	3,580,000	3,769,916
Series 2023D
07/01/2041	5.000%	6,000,000	6,720,907
Revenue Bonds
Series 2023B
07/01/2040	5.000%	2,000,000	2,251,220

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Los Angeles Department of Water & Power System
Refunding Revenue Bonds
Series 2018A
07/01/2035	5.000%	1,750,000	1,866,261
Redding Joint Powers Financing Authority
Refunding Revenue Bonds
Series 2015A
06/01/2031	5.000%	1,045,000	1,077,994
Sacramento Municipal Utility District
Revenue Bonds
Electric
Series 2020H
08/15/2033	5.000%	1,000,000	1,133,129
Green Bonds
Series 2023K
08/15/2040	5.000%	500,000	564,530
08/15/2041	5.000%	400,000	448,266
Turlock Irrigation District
Refunding Revenue Bonds
Series 2020
01/01/2038	5.000%	1,650,000	1,802,701
Total			22,488,600
Other Bond Issue 1.0%
California Infrastructure & Economic Development Bank
Refunding Revenue Bonds
Salvation Army Western Territory (The)
Series 2016
09/01/2033	4.000%	400,000	405,031
09/01/2034	4.000%	600,000	607,464
Walt Disney Family Museum
Series 2016
02/01/2032	4.000%	350,000	354,176
02/01/2033	4.000%	500,000	505,478
City of Long Beach Marina System
Revenue Bonds
Series 2015
05/15/2028	5.000%	635,000	639,459
County of San Diego
Refunding Revenue Bonds
Sanford Burnham Prebys Medical Discovery Group
Series 2015
11/01/2025	5.000%	350,000	356,885
Total			2,868,493
Ports 0.3%
City of Long Beach Harbor
Revenue Bonds
Series 2019A
05/15/2036	5.000%	700,000	770,404

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Prepaid Gas 3.2%
California Community Choice Financing Authority
Revenue Bonds
Clean Energy Project
Series 2023 (Mandatory Put 04/01/30)
11/01/2054	5.250%	1,000,000	1,064,095
Series 2024 (Mandatory Put 04/01/32)
05/01/2054	5.000%	2,000,000	2,114,554
Green Bonds - Clean Energy Project
Series 2023 (Mandatory Put 08/01/29)
12/01/2053	5.000%	1,000,000	1,047,242
M-S-R Energy Authority
Revenue Bonds
Series 2009B
11/01/2029	6.125%	1,650,000	1,747,401
Series 2009C
11/01/2039	6.500%	2,350,000	2,930,993
Total			8,904,285
Recreation 0.6%
Del Mar Race Track Authority
Refunding Revenue Bonds
Series 2015
10/01/2025	5.000%	1,665,000	1,668,676
Refunded / Escrowed 8.2%
California Educational Facilities Authority
Revenue Bonds
University of Southern California
Series 2009C Escrowed to Maturity
10/01/2024	5.250%	3,000,000	3,020,314
California Municipal Finance Authority
Prerefunded 02/01/25 Revenue Bonds
Community Medical Centers
Series 2015A
02/01/2027	5.000%	1,200,000	1,211,936
Refunding Revenue Bonds
Retirement Housing Foundation
Series 2017 Escrowed to Maturity
11/15/2029	5.000%	390,000	428,718
11/15/2030	5.000%	600,000	670,183
11/15/2032	5.000%	850,000	974,926
California School Finance Authority(d)
Revenue Bonds
River Springs Charter School Project
Series 2015 Escrowed to Maturity
07/01/2025	5.250%	605,000	610,152

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
California Statewide Communities Development Authority
Prerefunded 02/15/26 Revenue Bonds
Enloe Medical Center
Series 2015
08/15/2030	5.000%	1,990,000	2,048,129
Prerefunded 07/01/24 Revenue Bonds
Huntington Memorial Hospital
Series 2014B
07/01/2033	5.000%	2,300,000	2,304,431
Prerefunded 10/01/24 Revenue Bonds
Henry Mayo Newhall Memorial Hospital
Series 2014A (AGM)
10/01/2027	5.000%	1,000,000	1,005,137
City of Los Angeles Department of Airports
Prerefunded 05/15/29 Refunding Revenue Bonds
Subordinated Series 2019
05/15/2035	5.000%	2,490,000	2,738,345
05/15/2037	5.000%	1,410,000	1,550,629
Golden State Tobacco Securitization Corp.
Prerefunded 06/01/25 Asset-Backed Revenue Bonds
Series 2015A
06/01/2033	5.000%	4,000,000	4,072,982
Refunding Revenue Bonds
Series 2017A-1 Escrowed to Maturity
06/01/2024	5.000%	2,000,000	2,002,067
Total			22,637,949
Retirement Communities 3.4%
California Health Facilities Financing Authority
Refunding Revenue Bonds
Northern California Presbyterian Homes
Series 2015
07/01/2028	5.000%	310,000	316,753
07/01/2029	5.000%	300,000	306,557
Revenue Bonds
Episcopal Communities & Services
Series 2024
11/15/2038	5.000%	500,000	534,693
California Municipal Finance Authority
Refunding Revenue Bonds
HumanGood Obligation Group
Series 2019A
10/01/2034	4.000%	500,000	497,207
10/01/2035	4.000%	1,000,000	984,542
California Public Finance Authority(d)
Revenue Bonds
Enso Village Project - Green Bonds - TEMPS 70
Series 2021
11/15/2028	2.375%	1,680,000	1,633,679

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
California Statewide Communities Development Authority
Refunding Revenue Bonds
American Baptist Homes West
Series 2015
10/01/2024	5.000%	2,575,000	2,577,768
10/01/2026	5.000%	1,000,000	1,008,605
Front Porch Communities & Services
Series 2017
04/01/2030	5.000%	150,000	155,199
Series 2021
04/01/2039	4.000%	750,000	731,180
Revenue Bonds
Viamonte Senior Living 1, Inc.
Series 2018
07/01/2035	4.000%	300,000	308,293
07/01/2036	4.000%	430,000	440,509
Total			9,494,985
Sales Tax 1.2%
California Statewide Communities Development Authority
Certificate of Participation
Total Road Improvement Program
Series 2018B (AGM)
12/01/2035	5.000%	1,405,000	1,521,648
City of Sacramento Transient Occupancy
Revenue Bonds
Convention Center Complex
Subordinated Series 2018
06/01/2035	5.000%	615,000	652,829
06/01/2036	5.000%	1,180,000	1,248,034
Total			3,422,511
Special Non Property Tax 0.2%
Berkeley Joint Powers Financing Authority
Revenue Bonds
Series 2016 (BAM)
06/01/2033	4.000%	415,000	420,340
06/01/2034	4.000%	250,000	253,130
Total			673,470
Special Property Tax 11.6%
Carson Public Financing Authority
Revenue Bonds
Series 2019
09/02/2026	5.000%	650,000	664,997
City & County of San Francisco Community Facilities District No. 2016-1
Special Tax Bonds
Series 2021
09/01/2041	4.000%	745,000	684,417

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
City of Irvine
Refunding Special Assessment Bonds
Limited Obligation Reassessment District
Series 2015
09/02/2025	5.000%	1,295,000	1,316,296
Special Assessment Refunding Bonds
Series 2019
09/02/2032	5.000%	340,000	365,540
Concord Redevelopment Agency Successor Agency
Refunding Tax Allocation Bonds
Series 2014 (BAM)
03/01/2025	5.000%	840,000	847,456
Emeryville Redevelopment Agency Successor Agency
Refunding Tax Allocation Bonds
Series 2014A (AGM)
09/01/2030	5.000%	815,000	818,439
09/01/2031	5.000%	590,000	592,491
Garden Grove Agency Community Development Successor Agency
Refunding Tax Allocation Bonds
Garden Grove Community Project
Series 2016 (BAM)
10/01/2030	5.000%	1,040,000	1,075,081
10/01/2031	5.000%	1,640,000	1,694,703
Inglewood Redevelopment Agency Successor Agency
Refunding Tax Allocation Bonds
Merged Redevelopment Project
Subordinated Series 2017 (BAM)
05/01/2032	5.000%	500,000	523,588
05/01/2033	5.000%	1,000,000	1,047,805
Irvine Facilities Financing Authority
Special Tax Bonds
Irvine Great Park Infrastructure Project
Series 2023
09/01/2040	5.000%	2,000,000	2,238,780
Irvine Unified School District
Refunding Special Tax Bonds
Series 2015
09/01/2030	5.000%	2,065,000	2,100,153
09/01/2031	5.000%	2,720,000	2,766,547
Oakley Redevelopment Agency
Refunding Tax Allocation Bonds
Oakley Redevelopment Project Area
Series 2018 (BAM)
09/01/2032	5.000%	335,000	363,624
09/01/2033	5.000%	730,000	791,120
09/01/2034	5.000%	500,000	541,170
Orange County Community Facilities District
Special Tax Bonds
Rienda Phase 2B
Series 2023
08/15/2043	5.250%	1,350,000	1,380,366

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Palm Desert Redevelopment Agency
Refunding Tax Allocation Bonds
Series 2017A (BAM)
10/01/2029	5.000%	890,000	933,945
10/01/2030	5.000%	350,000	367,745
Poway Unified School District Public Financing Authority
Special Tax Refunding Bonds
Series 2015B
09/01/2026	5.000%	990,000	1,013,937
Riverside County Public Financing Authority
Tax Allocation Bonds
Project Area #1-Desert Communities
Series 2016 (BAM)
10/01/2031	4.000%	1,000,000	1,002,203
San Francisco City & County Redevelopment Agency
Refunding Tax Allocation Bonds
Mission Bay North Redevelopment Project
Series 2016
08/01/2030	5.000%	275,000	286,500
08/01/2031	5.000%	355,000	369,859
Mission Bay South Redevelopment Project
Series 2016
08/01/2031	5.000%	670,000	698,043
08/01/2032	5.000%	580,000	604,194
San Mateo Redevelopment Agency Successor Agency
Refunding Tax Allocation Bonds
Series 2015A
08/01/2028	5.000%	1,860,000	1,897,565
08/01/2029	5.000%	1,000,000	1,019,929
Tustin Community Facilities District
Refunding Special Tax Bonds
Legacy Villages of Columbus #06-1
Series 2015
09/01/2029	5.000%	1,200,000	1,223,624
Tustin Community Redevelopment Agency Successor Agency
Refunding Tax Allocation Bonds
Series 2016
09/01/2032	4.000%	2,295,000	2,321,442
Vista Redevelopment Agency Successor Agency
Tax Allocation Refunding Bonds
Series 2015B1 (AGM)
09/01/2026	5.000%	700,000	714,597
Total			32,266,156
State Appropriated 4.6%
California State Public Works Board
Refunding Revenue Bonds
Various Capital Projects
Series 2023
09/01/2038	5.000%	2,000,000	2,252,615

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Various Purpose
Series 2022A
08/01/2036	5.000%	5,040,000	5,628,465
Revenue Bonds
Green Bonds
Series 2021
11/01/2037	4.000%	2,665,000	2,763,747
May Lee State Office Complex
Series 2024
04/01/2040	5.000%	2,000,000	2,240,577
Total			12,885,404
State General Obligation 2.1%
State of California
Unlimited General Obligation Bonds
Series 2019
11/01/2029	5.000%	2,165,000	2,387,545
04/01/2031	5.000%	1,000,000	1,092,794
Unlimited General Obligation Refunding Bonds
Series 2023
10/01/2039	5.000%	1,000,000	1,122,996
Various Purpose
Series 2021
10/01/2028	5.000%	1,205,000	1,301,819
Total			5,905,154
Tobacco 0.8%
California County Tobacco Securitization Agency
Refunding Revenue Bonds
Series 2020A
06/01/2032	5.000%	250,000	273,494
06/01/2033	5.000%	250,000	273,223
06/01/2034	4.000%	200,000	207,149
Tobacco Securitization Authority of Southern California
Refunding Revenue Bonds
San Diego County Tobacco Asset Securitization Corp.
Series 2019
06/01/2030	5.000%	1,220,000	1,325,723
Total			2,079,589
Transportation 0.2%
Peninsula Corridor Joint Powers Board
Refunding Revenue Bonds
Series 2019A
10/01/2036	5.000%	315,000	344,537
10/01/2037	5.000%	300,000	325,333
Total			669,870

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Turnpike / Bridge / Toll Road 2.2%
Bay Area Toll Authority
Refunding Revenue Bonds
Subordinated Series 2017
04/01/2031	4.000%	2,000,000	2,040,071
Foothill-Eastern Transportation Corridor Agency(g)
Refunding Revenue Bonds
Series 2015
01/15/2033	0.000%	5,000,000	3,555,383
Riverside County Transportation Commission
Refunding Revenue Bonds
RCTC 91 Express Lanes
Series 2021
06/01/2038	4.000%	375,000	381,074
Total			5,976,528
Water & Sewer 4.2%
Beaumont Public Improvement Authority
Revenue Bonds
Series 2018-A (AGM)
09/01/2035	5.000%	830,000	874,441
City of Riverside Water
Refunding Revenue Bonds
Series 2019A
10/01/2032	5.000%	1,500,000	1,656,712
City of Tulare Sewer
Refunding Revenue Bonds
Series 2015 (AGM)
11/15/2025	5.000%	700,000	716,192
11/15/2026	5.000%	1,000,000	1,023,131
Livermore Valley Water Financing Authority
Refunding Revenue Bonds
Series 2018A
07/01/2034	4.000%	920,000	942,079
Los Angeles Department of Water & Power Water System
Refunding Revenue Bonds
Series 2022D
07/01/2040	5.000%	2,500,000	2,805,830
Series 2023A
07/01/2040	5.000%	500,000	567,605
Mountain House Public Financing Authority
Revenue Bonds
Green Bonds
Subordinated Series 2020B (BAM)
12/01/2035	4.000%	1,000,000	1,035,704

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Santa Paula Utility Authority
Refunding Revenue Bonds
Series 2019 (AGM)
02/01/2034	4.000%	575,000	593,058
02/01/2036	4.000%	1,325,000	1,348,538
Total			11,563,290
Total Municipal Bonds (Cost $279,137,847)			276,565,065

Money Market Funds 0.3%
	Shares	Value ($)
BlackRock Liquidity Funds MuniCash, Institutional Shares, 3.515%(h)	939,191	939,285
Total Money Market Funds (Cost $939,191)		939,285
Total Investments in Securities (Cost: $281,077,038)		278,504,350
Other Assets & Liabilities, Net		(945,121 )
Net Assets		277,559,229

Notes to Portfolio of Investments

(a)	The Fund is entitled to receive principal and interest from the guarantor after a day or a week’s notice or upon maturity. The maturity date disclosed represents the final maturity.
(b)	Represents a variable rate security where the coupon rate adjusts on specified dates (generally daily or weekly) using the prevailing money market rate. The interest rate shown was the current rate as of April 30, 2024.
(c)	Income from this security may be subject to alternative minimum tax.
(d)	Represents privately placed and other securities and instruments exempt from Securities and Exchange Commission registration (collectively, private placements), such as Section 4(a)(2) and Rule 144A eligible securities, which are often sold only to qualified institutional buyers. At April 30, 2024, the total value of these securities amounted to $16,600,032, which represents 5.98% of total net assets.
(e)	Represents a variable rate security with a step coupon where the rate adjusts according to a schedule for a series of periods, typically lower for an initial period and then increasing to a higher coupon rate thereafter. The interest rate shown was the current rate as of April 30, 2024.
(f)	Represents a security purchased on a when-issued basis.
(g)	Zero coupon bond.
(h)	The rate shown is the seven-day current annualized yield at April 30, 2024.

Abbreviation Legend

AGM	Assured Guaranty Municipal Corporation
BAM	Build America Mutual Assurance Co.
NPFGC	National Public Finance Guarantee Corporation

Fair value measurements

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Fair value measurements (continued)

■

Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date. Valuation adjustments are not applied to Level 1 investments.

■

Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

■

Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.

The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.

The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.

The following table is a summary of the inputs used to value the Fund’s investments at April 30, 2024:

	Level 1 ($)	Level 2 ($)	Level 3 ($)	Total ($)
Investments in Securities
Floating Rate Notes	—	1,000,000	—	1,000,000
Municipal Bonds	—	276,565,065	—	276,565,065
Money Market Funds	939,285	—	—	939,285
Total Investments in Securities	939,285	277,565,065	—	278,504,350

See the Portfolio of Investments for all investment classifications not indicated in the table.

The Fund’s assets assigned to the Level 2 input category are generally valued using the market approach, in which a security’s value is determined through reference to prices and information from market transactions for similar or identical assets.

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Statement of Assets and Liabilities

April 30, 2024

Assets
Investments in securities, at value
Unaffiliated issuers (cost $281,077,038)	$278,504,350
Cash	1,202
Receivable for:
Capital shares sold	729,411
Dividends	1,861
Interest	3,623,169
Expense reimbursement due from Investment Manager	773
Prepaid expenses	4,603
Total assets	282,865,369
Liabilities
Payable for:
Investments purchased on a delayed delivery basis	3,994,780
Capital shares redeemed	562,518
Distributions to shareholders	618,785
Management services fees	3,560
Distribution and/or service fees	221
Transfer agent fees	12,983
Compensation of board members	584
Other expenses	5,969
Deferred compensation of board members	106,740
Total liabilities	5,306,140
Net assets applicable to outstanding capital stock	$277,559,229
Represented by
Paid in capital	292,803,884
Total distributable earnings (loss)	(15,244,655 )
Total - representing net assets applicable to outstanding capital stock	$277,559,229
Class A
Net assets	$32,130,343
Shares outstanding	3,293,943
Net asset value per share	$9.75
Maximum sales charge	3.00%
Maximum offering price per share (calculated by dividing the net asset value per share by 1.0 minus the maximum sales charge for Class A shares)	$10.05
Advisor Class
Net assets	$13,611,936
Shares outstanding	1,399,563
Net asset value per share	$9.73
Institutional Class
Net assets	$149,369,093
Shares outstanding	15,336,032
Net asset value per share	$9.74
Institutional 2 Class
Net assets	$7,951,198
Shares outstanding	819,520
Net asset value per share	$9.70
Institutional 3 Class
Net assets	$74,496,659
Shares outstanding	7,656,609
Net asset value per share	$9.73

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Statement of Operations

Year Ended April 30, 2024

Net investment income
Income:
Dividends — unaffiliated issuers	$51,654
Interest	9,361,471
Total income	9,413,125
Expenses:
Management services fees	1,391,286
Distribution and/or service fees
Class A	90,002
Class C	24,308
Transfer agent fees
Class A	25,318
Advisor Class	9,051
Class C	1,695
Institutional Class	105,025
Institutional 2 Class	5,426
Institutional 3 Class	5,181
Custodian fees	2,374
Printing and postage fees	16,608
Registration fees	16,200
Accounting services fees	30,993
Legal fees	15,280
Interest on interfund lending	844
Compensation of chief compliance officer	53
Compensation of board members	13,814
Deferred compensation of board members	22,585
Other	15,747
Total expenses	1,791,790
Fees waived or expenses reimbursed by Investment Manager and its affiliates	(313,959 )
Expense reduction	(20 )
Total net expenses	1,477,811
Net investment income	7,935,314
Realized and unrealized gain (loss) — net
Net realized gain (loss) on:
Investments — unaffiliated issuers	(1,592,738 )
Net realized loss	(1,592,738 )
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated issuers	(752,281 )
Net change in unrealized appreciation (depreciation)	(752,281 )
Net realized and unrealized loss	(2,345,019 )
Net increase in net assets resulting from operations	$5,590,295

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Statement of Changes in Net Assets (continued)

	Year Ended		Year Ended
	April 30, 2024		April 30, 2023
	Shares	Dollars ($)	Shares	Dollars ($)
Capital stock activity
Class A
Shares sold	1,246,404	12,145,689	1,388,101	13,484,325
Distributions reinvested	83,290	810,458	96,307	938,350
Shares redeemed	(2,495,941 )	(24,008,550 )	(1,570,463 )	(15,256,743 )
Net decrease	(1,166,247 )	(11,052,403 )	(86,055 )	(834,068 )
Advisor Class
Shares sold	280,713	2,744,464	1,127,065	10,749,141
Distributions reinvested	35,290	342,914	19,271	187,120
Shares redeemed	(123,653 )	(1,194,502 )	(114,264 )	(1,106,916 )
Net increase	192,350	1,892,876	1,032,072	9,829,345
Class C
Shares sold	35,755	352,215	61,305	594,796
Distributions reinvested	3,662	35,632	5,920	57,628
Shares redeemed	(364,588 )	(3,561,970 )	(188,806 )	(1,846,248 )
Net decrease	(325,171 )	(3,174,123 )	(121,581 )	(1,193,824 )
Institutional Class
Shares sold	4,351,712	42,189,058	11,042,139	107,049,493
Distributions reinvested	378,308	3,679,754	311,400	3,032,847
Shares redeemed	(4,271,275 )	(41,287,790 )	(32,069,479 )	(313,176,375 )
Net increase (decrease)	458,745	4,581,022	(20,715,940 )	(203,094,035 )
Institutional 2 Class
Shares sold	432,453	4,226,334	679,936	6,601,469
Distributions reinvested	26,181	253,435	21,332	206,883
Shares redeemed	(512,601 )	(4,905,336 )	(730,653 )	(7,065,394 )
Net decrease	(53,967 )	(425,567 )	(29,385 )	(257,042 )
Institutional 3 Class
Shares sold	457,945	4,434,689	17,610,722	172,173,489
Distributions reinvested	18,894	183,616	17,727	172,176
Shares redeemed	(3,116,248 )	(30,295,914 )	(8,020,896 )	(77,677,279 )
Net increase (decrease)	(2,639,409 )	(25,677,609 )	9,607,553	94,668,386
Total net decrease	(3,533,699 )	(33,855,804 )	(10,313,336 )	(100,881,238 )

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Financial Highlights

The following table is intended to help you understand the Fund’s financial performance. Certain information reflects financial results for a single share of a class held for the periods shown. Per share net investment income (loss) amounts are calculated based on average shares outstanding during the period. Total return assumes reinvestment of all dividends and distributions, if any. Total return does not reflect payment of sales charges, if any. Total return and portfolio turnover are not annualized for periods of less than one year. The ratios of expenses and net investment income are annualized for periods of less than one year. The portfolio turnover rate is calculated without regard to purchase and sales transactions of short-term instruments and certain derivatives, if any. If such transactions were included, the Fund’s portfolio turnover rate may be higher.

	Net asset value, beginning of period	Net investment income	Net realized and unrealized gain (loss)	Total from investment operations	Distributions from net investment income	Total distributions to shareholders
Class A
Year Ended 4/30/2024	$9.81	0.24	(0.06 )	0.18	(0.24 )	(0.24 )
Year Ended 4/30/2023	$9.77	0.23	0.04	0.27	(0.23 )	(0.23 )
Year Ended 4/30/2022	$10.71	0.21	(0.94 )	(0.73 )	(0.21 )	(0.21 )
Year Ended 4/30/2021	$10.24	0.22	0.47	0.69	(0.22 )	(0.22 )
Year Ended 4/30/2020	$10.46	0.24	(0.22 )	0.02	(0.24 )	(0.24 )
Advisor Class
Year Ended 4/30/2024	$9.78	0.26	(0.05 )	0.21	(0.26 )	(0.26 )
Year Ended 4/30/2023	$9.75	0.25	0.03	0.28	(0.25 )	(0.25 )
Year Ended 4/30/2022	$10.68	0.23	(0.93 )	(0.70 )	(0.23 )	(0.23 )
Year Ended 4/30/2021	$10.21	0.25	0.47	0.72	(0.25 )	(0.25 )
Year Ended 4/30/2020	$10.43	0.27	(0.22 )	0.05	(0.27 )	(0.27 )
Institutional Class
Year Ended 4/30/2024	$9.79	0.26	(0.05 )	0.21	(0.26 )	(0.26 )
Year Ended 4/30/2023	$9.75	0.25	0.04	0.29	(0.25 )	(0.25 )
Year Ended 4/30/2022	$10.69	0.23	(0.94 )	(0.71 )	(0.23 )	(0.23 )
Year Ended 4/30/2021	$10.21	0.25	0.48	0.73	(0.25 )	(0.25 )
Year Ended 4/30/2020	$10.44	0.27	(0.23 )	0.04	(0.27 )	(0.27 )
Institutional 2 Class
Year Ended 4/30/2024	$9.76	0.26	(0.06 )	0.20	(0.26 )	(0.26 )
Year Ended 4/30/2023	$9.72	0.25	0.04	0.29	(0.25 )	(0.25 )
Year Ended 4/30/2022	$10.66	0.24	(0.94 )	(0.70 )	(0.24 )	(0.24 )
Year Ended 4/30/2021	$10.18	0.26	0.48	0.74	(0.26 )	(0.26 )
Year Ended 4/30/2020	$10.41	0.27	(0.22 )	0.05	(0.28 )	(0.28 )

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Financial Highlights (continued)

	Net asset value, end of period	Total return	Total gross expense ratio to average net assets(a)	Total net expense ratio to average net assets(a),(b)	Net investment income ratio to average net assets	Portfolio turnover	Net assets, end of period (000’s)
Class A
Year Ended 4/30/2024	$9.75	1.85%	0.84% (c)	0.73% (c),(d)	2.45%	12%	$32,130
Year Ended 4/30/2023	$9.81	2.76%	0.83% (c)	0.73% (c),(d)	2.31%	12%	$43,752
Year Ended 4/30/2022	$9.77	(6.96% )	0.85%	0.74% (d)	1.96%	8%	$44,427
Year Ended 4/30/2021	$10.71	6.80%	0.87%	0.75% (d)	2.09%	5%	$34,289
Year Ended 4/30/2020	$10.24	0.17%	0.86%	0.75% (d)	2.30%	6%	$31,402
Advisor Class
Year Ended 4/30/2024	$9.73	2.21%	0.59% (c)	0.48% (c),(d)	2.70%	12%	$13,612
Year Ended 4/30/2023	$9.78	2.92%	0.58% (c)	0.48% (c),(d)	2.63%	12%	$11,806
Year Ended 4/30/2022	$9.75	(6.65% )	0.60%	0.49% (d)	2.21%	8%	$1,707
Year Ended 4/30/2021	$10.68	7.08%	0.62%	0.50% (d)	2.34%	5%	$2,961
Year Ended 4/30/2020	$10.21	0.41%	0.61%	0.50% (d)	2.54%	6%	$2,354
Institutional Class
Year Ended 4/30/2024	$9.74	2.21%	0.59% (c)	0.48% (c),(d)	2.70%	12%	$149,369
Year Ended 4/30/2023	$9.79	3.02%	0.58% (c)	0.48% (c),(d)	2.52%	12%	$145,710
Year Ended 4/30/2022	$9.75	(6.74% )	0.60%	0.49% (d)	2.21%	8%	$347,070
Year Ended 4/30/2021	$10.69	7.18%	0.62%	0.50% (d)	2.34%	5%	$388,017
Year Ended 4/30/2020	$10.21	0.31%	0.61%	0.50% (d)	2.54%	6%	$382,665
Institutional 2 Class
Year Ended 4/30/2024	$9.70	2.12%	0.57% (c)	0.47% (c)	2.72%	12%	$7,951
Year Ended 4/30/2023	$9.76	3.03%	0.56% (c)	0.46% (c)	2.58%	12%	$8,524
Year Ended 4/30/2022	$9.72	(6.72% )	0.55%	0.44%	2.25%	8%	$8,777
Year Ended 4/30/2021	$10.66	7.26%	0.56%	0.44%	2.40%	5%	$13,265
Year Ended 4/30/2020	$10.18	0.37%	0.55%	0.44%	2.60%	6%	$10,846

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Financial Highlights (continued)

	Net asset value, beginning of period	Net investment income	Net realized and unrealized gain (loss)	Total from investment operations	Distributions from net investment income	Total distributions to shareholders
Institutional 3 Class
Year Ended 4/30/2024	$9.78	0.27	(0.05 )	0.22	(0.27 )	(0.27 )
Year Ended 4/30/2023	$9.74	0.26	0.04	0.30	(0.26 )	(0.26 )
Year Ended 4/30/2022	$10.68	0.24	(0.94 )	(0.70 )	(0.24 )	(0.24 )
Year Ended 4/30/2021	$10.21	0.26	0.47	0.73	(0.26 )	(0.26 )
Year Ended 4/30/2020	$10.43	0.28	(0.22 )	0.06	(0.28 )	(0.28 )

Notes to Financial Highlights
(a)	In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)	Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)	Ratios include interfund lending expense which is less than 0.01%.
(d)	The benefits derived from expense reductions had an impact of less than 0.01%.

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements

April 30, 2024

Note 1. Organization

Columbia California Intermediate Municipal Bond Fund (the Fund), a series of Columbia Funds Series Trust (the Trust), is a diversified fund. The Trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Delaware statutory trust.

Fund shares

The Trust may issue an unlimited number of shares (without par value). The Fund offers each of the share classes listed in the Statement of Assets and Liabilities. Although all share classes generally have identical voting, dividend and liquidation rights, each share class votes separately when required by the Trust’s organizational documents or by law. Each share class has its own expense and sales charge structure. Different share classes may have different minimum initial investment amounts and pay different net investment income distribution amounts to the extent the expenses of distributing such share classes vary. Distributions to shareholders in a liquidation will be proportional to the net asset value of each share class.

As described in the Fund’s prospectus, Class A shares are offered to the general public for investment. Advisor Class, Institutional Class, Institutional 2 Class and Institutional 3 Class shares are available for purchase through authorized investment professionals to omnibus retirement plans or to institutional investors and to certain other investors as also described in the Fund’s prospectus.

The Fund’s Board of Trustees approved a proposal to accelerate the conversion of Class C shares into Class A shares of the Fund. Effective on February 12, 2024, Class C shares of the Fund were closed to new and existing investors and effective on April 15, 2024, shares held by Class C shareholders were converted into Class A shares in a tax-free transaction.

Note 2. Summary of significant accounting policies

Basis of preparation

The Fund is an investment company that applies the accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946, Financial Services - Investment Companies (ASC 946). The financial statements are prepared in accordance with U.S. generally accepted accounting principles (GAAP), which requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates.

The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements.

Security valuation

Debt securities generally are valued based on prices obtained from pricing services, which are intended to reflect market transactions for normal, institutional-size trading units of similar securities. The services may use various pricing techniques that take into account, as applicable, factors such as yield, quality, coupon rate, maturity, type of issue, trading characteristics and other data, as well as approved independent broker-dealer quotes. Debt securities for which quotations are not readily available or not believed to be reflective of market value may also be valued based upon a bid quote from an approved independent broker-dealer. Debt securities maturing in 60 days or less are valued primarily at amortized market value, unless this method results in a valuation that management believes does not approximate fair value.

Investments in open-end investment companies (other than exchange-traded funds (ETFs)), are valued at the latest net asset value reported by those companies as of the valuation time.

Investments for which market quotations are not readily available, or that have quotations which management believes are not reflective of market value or reliable, are valued at fair value as determined in good faith under procedures approved by the Board of Trustees. If a security or class of securities (such as foreign securities) is valued at fair value, such value is likely to be different from the quoted or published price for the security, if available.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The determination of fair value often requires significant judgment. To determine fair value, management may use assumptions including but not limited to future cash flows and estimated risk premiums. Multiple inputs from various sources may be used to determine fair value.

GAAP requires disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category. This information is disclosed following the Fund’s Portfolio of Investments.

Delayed delivery securities

The Fund may trade securities on other than normal settlement terms, including securities purchased or sold on a “when-issued” or "forward commitment" basis. This may increase risk to the Fund since the other party to the transaction may fail to deliver, which could cause the Fund to subsequently invest at less advantageous prices. The Fund designates cash or liquid securities in an amount equal to the delayed delivery commitment.

Security transactions

Security transactions are accounted for on the trade date. Cost is determined and gains (losses) are based upon the specific identification method for both financial statement and federal income tax purposes.

Income recognition

Interest income is recorded on an accrual basis. Market premiums and discounts, including original issue discounts, are amortized and accreted, respectively, over the expected life of the security on all debt securities, unless otherwise noted.

The Fund may place a debt security on non-accrual status and reduce related interest income when it becomes probable that the interest will not be collected and the amount of uncollectible interest can be reasonably estimated. The Fund may also adjust accrual rates when it becomes probable the full interest will not be collected and a partial payment will be received. A defaulted debt security is removed from non-accrual status when the issuer resumes interest payments or when collectability of interest is reasonably assured.

Dividend income is recorded on the ex-dividend date.

Expenses

General expenses of the Trust are allocated to the Fund and other funds of the Trust based upon relative net assets or other expense allocation methodologies determined by the nature of the expense. Expenses directly attributable to the Fund are charged to the Fund. Expenses directly attributable to a specific class of shares are charged to that share class.

Determination of class net asset value

All income, expenses (other than class-specific expenses, which are charged to that share class, as shown in the Statement of Operations) and realized and unrealized gains (losses) are allocated to each class of the Fund on a daily basis, based on the relative net assets of each class, for purposes of determining the net asset value of each class.

Federal income tax status

The Fund intends to qualify each year as a regulated investment company under Subchapter M of the Internal Revenue Code, as amended, and will distribute substantially all of its net tax-exempt and investment company taxable income and net capital gain, if any, for its tax year, and as such will not be subject to federal income taxes. In addition, the Fund intends to distribute in each calendar year substantially all of its ordinary income, capital gain net income and certain other amounts, if any, such that the Fund should not be subject to federal excise tax. Therefore, no federal income or excise tax provision is recorded.

Distributions to shareholders

Distributions from net investment income, if any, are declared daily and paid monthly. Net realized capital gains, if any, are distributed at least annually. Income distributions and capital gain distributions are determined in accordance with federal income tax regulations, which may differ from GAAP.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Guarantees and indemnifications

Under the Trust’s organizational documents and, in some cases, by contract, its officers and trustees are indemnified against certain liabilities arising out of the performance of their duties to the Trust or its funds. In addition, certain of the Fund’s contracts with its service providers contain general indemnification clauses. The Fund’s maximum exposure under these arrangements is unknown since the amount of any future claims that may be made against the Fund cannot be determined, and the Fund has no historical basis for predicting the likelihood of any such claims.

Recent accounting pronouncements and regulatory updates

Tailored Shareholder Reports

In October 2022, the Securities and Exchange Commission adopted a final rule, "Tailored Shareholder Reports for Mutual Funds and Exchange-Traded Funds; Fee Information in Investment Company Advertisements." The rule and form amendments will, among other things, require the Fund to transmit concise and visually engaging shareholder reports that highlight key information. The amendments will require that funds tag information in a structured data format and that certain more in-depth information be made available online and available for delivery free of charge to investors on request. The amendments became effective January 24, 2023. There is an 18-month transition period after the effective date of the amendments.

Note 3. Fees and other transactions with affiliates

Management services fees

The Fund has entered into a Management Agreement with Columbia Management Investment Advisers, LLC (the Investment Manager), a wholly-owned subsidiary of Ameriprise Financial, Inc. (Ameriprise Financial). Under the Management Agreement, the Investment Manager provides the Fund with investment research and advice, as well as administrative and accounting services. The management services fee is an annual fee that is equal to a percentage of the Fund’s daily net assets that declines from 0.47% to 0.31% as the Fund’s net assets increase. The effective management services fee rate for the year ended April 30, 2024 was 0.47% of the Fund’s average daily net assets.

Compensation of Board members

Members of the Board of Trustees who are not officers or employees of the Investment Manager or Ameriprise Financial are compensated for their services to the Fund as disclosed in the Statement of Operations. Under a Deferred Compensation Plan (the Deferred Plan), these members of the Board of Trustees may elect to defer payment of up to 100% of their compensation. Deferred amounts are treated as though equivalent dollar amounts had been invested in shares of certain funds managed by the Investment Manager. The Fund’s liability for these amounts is adjusted for market value changes and remains in the Fund until distributed in accordance with the Deferred Plan. All amounts payable under the Deferred Plan constitute a general unsecured obligation of the Fund. The expense for the Deferred Plan, which includes Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations, is included in "Deferred compensation of board members" in the Statement of Operations.

Compensation of Chief Compliance Officer

The Board of Trustees has appointed a Chief Compliance Officer for the Fund in accordance with federal securities regulations. As disclosed in the Statement of Operations, a portion of the Chief Compliance Officer’s total compensation is allocated to the Fund, along with other allocations to affiliated registered investment companies managed by the Investment Manager and its affiliates, based on relative net assets.

Transfer agency fees

Under a Transfer and Dividend Disbursing Agent Agreement, Columbia Management Investment Services Corp. (the Transfer Agent), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, is responsible for providing transfer agency services to the Fund. The Transfer Agent has contracted with SS&C GIDS, Inc. (SS&C GIDS) to serve as sub-transfer agent. The Transfer Agent pays the fees of SS&C GIDS for services as sub-transfer agent and SS&C GIDS is not entitled to reimbursement for such fees from the Fund (with the exception of out-of-pocket fees).

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The Fund pays the Transfer Agent a monthly transfer agency fee based on the number or the average value of accounts, depending on the type of account. In addition, the Fund pays the Transfer Agent a fee for shareholder services based on the number of accounts or on a percentage of the average aggregate value of the Fund’s shares maintained in omnibus accounts up to the lesser of the amount charged by the financial intermediary or a cap established by the Board of Trustees from time to time.

For the year ended April 30, 2024, the Fund’s effective transfer agency fee rates as a percentage of average daily net assets of each class were as follows:

	Effective rate (%)
Class A	0.07
Advisor Class	0.07
Class C	0.07 (a)
Institutional Class	0.07
Institutional 2 Class	0.06
Institutional 3 Class	0.01

(a)	Unannualized.

An annual minimum account balance fee of $20 may apply to certain accounts with a value below the applicable share class’s initial minimum investment requirements to reduce the impact of small accounts on transfer agency fees. These minimum account balance fees are remitted to the Fund and recorded as part of expense reductions in the Statement of Operations. For the year ended April 30, 2024, these minimum account balance fees reduced total expenses of the Fund by $20.

Distribution and service fees

The Fund has entered into an agreement with Columbia Management Investment Distributors, Inc. (the Distributor), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, for distribution and shareholder services. The Board of Trustees has approved, and the Fund has adopted, distribution and shareholder service plans (the Plans) applicable to certain share classes, which set the distribution and service fees for the Fund. These fees are calculated daily and are intended to compensate the Distributor and/or eligible selling and/or servicing agents for selling shares of the Fund and providing services to investors.

Under the Plans, the Fund pays a monthly combined distribution and service fee to the Distributor at the maximum annual rate of 0.25% of the average daily net assets attributable to Class A shares of the Fund. Also under the Plans, the Fund pays a monthly service fee to the Distributor at the maximum annual rate of 0.25% of the average daily net assets attributable to Class C shares of the Fund and a monthly distribution fee to the Distributor at the maximum annual rate of 0.75% of the average daily net assets attributable to Class C shares of the Fund. As a result of Class C shares of the Fund being converted into Class A shares, April 15, 2024 was the last day the Fund paid a distribution and service fee for Class C shares.

Sales charges (unaudited)

Sales charges, including front-end charges and contingent deferred sales charges (CDSCs), received by the Distributor for distributing Fund shares for the year ended April 30, 2024, if any, are listed below:

	Front End (%)	CDSC (%)	Amount ($)
Class A	3.00	0.75 (a)	4,118
Class C	—	1.00 (b)	—

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

(a)	This charge is imposed on certain investments of $500,000 or more if redeemed within 12 months after purchase.
(b)	This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

The Fund’s other share classes are not subject to sales charges.

Expenses waived/reimbursed by the Investment Manager and its affiliates

The Investment Manager and certain of its affiliates have contractually agreed to waive fees and/or reimburse expenses (excluding certain fees and expenses described below) for the period(s) disclosed below, unless sooner terminated at the sole discretion of the Board of Trustees, so that the Fund’s net operating expenses, after giving effect to fees waived/expenses reimbursed and any balance credits and/or overdraft charges from the Fund’s custodian, do not exceed the following annual rate(s) as a percentage of the classes’ average daily net assets:

	September 1, 2023 through August 31, 2024	Prior to September 1, 2023
Class A	0.73 %	0.75 %
Advisor Class	0.48	0.50
Institutional Class	0.48	0.50
Institutional 2 Class	0.47	0.47
Institutional 3 Class	0.42	0.42

Under the agreement governing these fee waivers and/or expense reimbursement arrangements, the following fees and expenses are excluded from the waiver/reimbursement commitment, and therefore will be paid by the Fund, if applicable: taxes (including foreign transaction taxes), expenses associated with investments in affiliated and non-affiliated pooled investment vehicles (including mutual funds and exchange-traded funds), transaction costs and brokerage commissions, costs related to any securities lending program, dividend expenses associated with securities sold short, inverse floater program fees and expenses, transaction charges and interest on borrowed money, interest, costs associated with shareholder meetings, infrequent and/or unusual expenses and any other expenses the exclusion of which is specifically approved by the Board of Trustees. This agreement may be modified or amended only with approval from the Investment Manager, certain of its affiliates and the Fund. In addition to the contractual agreement, the Investment Manager and certain of its affiliates have voluntarily agreed to waive fees and/or reimburse Fund expenses (excluding certain fees and expenses described above) so that Fund level expenses (expenses directly attributable to the Fund and not to a specific share class) are waived proportionately across all share classes. This arrangement may be revised or discontinued at any time. Any fees waived and/or expenses reimbursed under the expense reimbursement arrangements described above are not recoverable by the Investment Manager or its affiliates in future periods.

Note 4. Federal tax information

The timing and character of income and capital gain distributions are determined in accordance with income tax regulations, which may differ from GAAP because of temporary or permanent book to tax differences.

At April 30, 2024, these differences were primarily due to differing treatment for investments in partnerships and/or grantor trusts, capital loss carryforwards, trustees’ deferred compensation and distributions. To the extent these differences were permanent, reclassifications were made among the components of the Fund’s net assets. Temporary differences do not require reclassifications.

The following reclassifications were made:

Excess of distributions over net investment income ($)	Accumulated net realized (loss) ($)	Paid in capital ($)
(181 )	182	(1 )

Net investment income (loss) and net realized gains (losses), as disclosed in the Statement of Operations, and net assets were not affected by this reclassification.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The tax character of distributions paid during the years indicated was as follows:

Year Ended April 30, 2024				Year Ended April 30, 2023
Ordinary income ($)	Tax-exempt income ($)	Long-term capital gains ($)	Total ($)	Ordinary income ($)	Tax-exempt income ($)	Long-term capital gains ($)	Total ($)
13,141	7,875,300	—	7,888,441	14,808	8,647,135	—	8,661,943

Short-term capital gain distributions, if any, are considered ordinary income distributions for tax purposes.

At April 30, 2024, the components of distributable earnings on a tax basis were as follows:

Undistributed ordinary income ($)	Undistributed tax- exempt income ($)	Undistributed long-term capital gains ($)	Capital loss carryforwards ($)	Net unrealized (depreciation) ($)
—	655,287	—	(12,601,465 )	(2,572,952 )

At April 30, 2024, the cost of all investments for federal income tax purposes along with the aggregate gross unrealized appreciation and depreciation based on that cost was:

Federal tax cost ($)	Gross unrealized appreciation ($)	Gross unrealized (depreciation) ($)	Net unrealized (depreciation) ($)
281,077,302	1,921,145	(4,494,097 )	(2,572,952 )

Tax cost of investments and unrealized appreciation/(depreciation) may also include timing differences that do not constitute adjustments to tax basis.

The following capital loss carryforwards, determined at April 30, 2024, may be available to reduce future net realized gains on investments, if any, to the extent permitted by the Internal Revenue Code. In addition, for the year ended April 30, 2024, capital loss carryforwards utilized, if any, were as follows:

No expiration short-term ($)	No expiration long-term ($)	Total ($)	Utilized ($)
(5,259,899 )	(7,341,566 )	(12,601,465 )	—

Management of the Fund has concluded that there are no significant uncertain tax positions in the Fund that would require recognition in the financial statements. However, management’s conclusion may be subject to review and adjustment at a later date based on factors including, but not limited to, new tax laws, regulations, and administrative interpretations (including relevant court decisions). Generally, the Fund’s federal tax returns for the prior three fiscal years remain subject to examination by the Internal Revenue Service.

Note 5. Portfolio information

The cost of purchases and proceeds from sales of securities, excluding short-term investments and derivatives, if any, aggregated to $33,686,741 and $62,661,546, respectively, for the year ended April 30, 2024. The amount of purchase and sale activity impacts the portfolio turnover rate reported in the Financial Highlights.

Note 6. Interfund lending

Pursuant to an exemptive order granted by the Securities and Exchange Commission, the Fund participates in a program (the Interfund Program) allowing each participating Columbia Fund (each, a Participating Fund) to lend money directly to and, except for closed-end funds and money market funds, borrow money directly from other Participating Funds for temporary purposes. The amounts eligible for borrowing and lending under the Interfund Program are subject to certain restrictions.

Interfund loans are subject to the risk that the borrowing fund could be unable to repay the loan when due, and a delay in repayment to the lending fund could result in lost opportunities and/or additional lending costs. The exemptive order is subject to conditions intended to mitigate conflicts of interest arising from the Investment Manager’s relationship with each Participating Fund.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The Fund’s activity in the Interfund Program during the year ended April 30, 2024 was as follows:

Borrower or lender	Average loan balance ($)	Weighted average interest rate (%)	Number of days with outstanding loans
Borrower	2,650,000	5.73	2

Interest expense incurred by the Fund is recorded as Interest on interfund lending in the Statement of Operations. The Fund had no outstanding interfund loans at April 30, 2024.

Note 7. Line of credit

The Fund has access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. whereby the Fund may borrow for the temporary funding of shareholder redemptions or for other temporary or emergency purposes. Pursuant to an October 26, 2023 amendment and restatement, the credit facility, which is an agreement between the Fund and certain other funds managed by the Investment Manager or an affiliated investment manager, severally and not jointly, permits aggregate borrowings up to $900 million. Interest is currently charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate plus, in each case, 1.00%. Each borrowing under the credit facility matures no later than 60 days after the date of borrowing. The Fund also pays a commitment fee equal to its pro rata share of the unused amount of the credit facility at a rate of 0.15% per annum. The commitment fee is included in other expenses in the Statement of Operations. This agreement expires annually in October unless extended or renewed. Prior to the October 26, 2023 amendment and restatement, the Fund had access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. which permitted collective borrowings up to $950 million. Interest was charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate plus, in each case, 1.00%.

The Fund had no borrowings during the year ended April 30, 2024.

Note 8. Significant risks

Credit risk

Credit risk is the risk that the value of debt instruments in the Fund’s portfolio may decline because the issuer defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Credit rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Lower-rated or unrated debt instruments held by the Fund may present increased credit risk as compared to higher-rated debt instruments.

Interest rate risk

Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Actions by governments and central banking authorities can result in increases or decreases in interest rates. Higher periods of inflation could lead such authorities to raise interest rates. Increasing interest rates may negatively affect the value of debt securities held by the Fund, resulting in a negative impact on the Fund’s performance and net asset value per share. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. The Fund is subject to the risk that the income generated by its investments may not keep pace with inflation.

Liquidity risk

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Generally, the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. A less liquid market can lead to an increase in Fund redemptions, which may negatively impact Fund performance and net asset value per share, including, for example, if the Fund is forced to sell securities in a down market.

Market risk

The Fund may incur losses due to declines in the value of one or more securities in which it invests. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s) more generally. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the Fund’s ability to price or value hard-to-value assets in thinly traded and closed markets and could cause significant redemptions and operational challenges. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies worldwide. As a result, local, regional or global events such as terrorism, war, other conflicts, natural disasters, disease/virus outbreaks and epidemics or other public health issues, recessions, depressions or other events – or the potential for such events – could have a significant negative impact on global economic and market conditions.

Municipal securities risk

Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility, and include obligations of the governments of the U.S. territories, commonwealths and possessions such as Guam, Puerto Rico and the U.S. Virgin Islands to the extent such obligations are exempt from state and U.S. federal income taxes. The value of municipal securities can be significantly affected by actual or expected political and legislative changes at the federal or state level. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market.

Issuers in a state, territory, commonwealth or possession in which the Fund invests may experience significant financial difficulties for various reasons, including as the result of events that cannot be reasonably anticipated or controlled such as economic downturns or similar periods of economic stress, social conflict or unrest, labor disruption and natural disasters. Such financial difficulties may lead to credit rating downgrades or defaults of such issuers which in turn, could affect the market values and marketability of many or all municipal obligations of issuers in such state, territory, commonwealth or possession. The value of the Fund’s shares will be negatively impacted to the extent it invests in such securities. The Fund’s annual and semiannual reports show the Fund’s investment exposures at a point in time. The risk of investing in the Fund is directly correlated to the Fund’s investment exposures.

Because the Fund invests substantially in municipal securities issued by the state identified in the Fund’s name and political sub-divisions of that state, the Fund will be particularly affected by adverse tax, legislative, regulatory, demographic or political changes as well as changes impacting the state’s financial, economic or other condition and prospects. In addition, because of the relatively small number of issuers of tax-exempt securities in the state, the Fund may invest a higher percentage of assets in a single issuer and, therefore, be more exposed to the risk of loss than a fund that invests more broadly. The value of municipal and other securities owned by the Fund also may be adversely affected by future changes in federal or state income tax laws.

Shareholder concentration risk

At April 30, 2024, one unaffiliated shareholder of record owned 29.1% of the outstanding shares of the Fund in one or more accounts. The Fund has no knowledge about whether any portion of those shares was owned beneficially. Affiliated shareholders of record owned 30.2% of the outstanding shares of the Fund in one or more accounts. Fund shares sold to or redeemed by concentrated accounts may have a significant effect on the operations of the Fund. In the case of a large

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

redemption, the Fund may be forced to sell investments at inopportune times, including its liquid positions, which may result in Fund losses and the Fund holding a higher percentage of less liquid positions. Large redemptions could result in decreased economies of scale and increased operating expenses for non-redeeming Fund shareholders.

Note 9. Subsequent events

Management has evaluated the events and transactions that have occurred through the date the financial statements were issued and noted no items requiring adjustment of the financial statements or additional disclosure.

Note 10. Information regarding pending and settled legal proceedings

Ameriprise Financial and certain of its affiliates are involved in the normal course of business in legal proceedings which include regulatory inquiries, arbitration and litigation, including class actions concerning matters arising in connection with the conduct of their activities as part of a diversified financial services firm. Ameriprise Financial believes that the Fund is not currently the subject of, and that neither Ameriprise Financial nor any of its affiliates are the subject of, any pending legal, arbitration or regulatory proceedings that are likely to have a material adverse effect on the Fund or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Fund. Ameriprise Financial is required to make quarterly (10-Q), annual (10-K) and, as necessary, 8-K filings with the Securities and Exchange Commission (SEC) on legal and regulatory matters that relate to Ameriprise Financial and its affiliates. Copies of these filings may be obtained by accessing the SEC website at www.sec.gov.

There can be no assurance that these matters, or the adverse publicity associated with them, will not result in increased Fund redemptions, reduced sale of Fund shares or other adverse consequences to the Fund. Further, although we believe proceedings are not likely to have a material adverse effect on the Fund or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Fund, these proceedings are subject to uncertainties and, as such, we are unable to estimate the possible loss or range of loss that may result. An adverse outcome in one or more of these proceedings could result in adverse judgments, settlements, fines, penalties or other relief that could have a material adverse effect on the consolidated financial condition or results of operations of Ameriprise Financial or one or more of its affiliates that provide services to the Fund.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Columbia Funds Series Trust and Shareholders of Columbia California Intermediate Municipal Bond Fund

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities, including the portfolio of investments, of Columbia California Intermediate Municipal Bond Fund (one of the funds constituting Columbia Funds Series Trust, referred to hereafter as the "Fund") as of April 30, 2024, the related statement of operations for the year ended April 30, 2024, the statement of changes in net assets for each of the two years in the period ended April 30, 2024, including the related notes, and the financial highlights for each of the five years in the period ended April 30, 2024 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund as of April 30, 2024, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period ended April 30, 2024 and the financial highlights for each of the five years in the period ended April 30, 2024 in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits of these financial statements in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our procedures included confirmation of securities owned as of April 30, 2024 by correspondence with the custodian and broker. We believe that our audits provide a reasonable basis for our opinion.

/s/PricewaterhouseCoopers LLP

Minneapolis, Minnesota

June 20, 2024

We have served as the auditor of one or more investment companies within the Columbia Funds Complex since 1977.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Federal Income Tax Information

(Unaudited)

The Fund hereby designates the following tax attributes for the fiscal year ended April 30, 2024. Shareholders will be notified in early 2025 of the amounts for use in preparing 2024 income tax returns.

Exempt- interest dividends
99.83%

Exempt-interest dividends. The percentage of net investment income distributed during the fiscal year that qualifies as exempt-interest dividends for federal income tax purposes. A portion of the income may be subject to federal alternative minimum tax.

TRUSTEES AND OFFICERS

(Unaudited)

The Board oversees the Fund’s operations and appoints officers who are responsible for day-to-day business decisions based on policies set by the Board. The following table provides basic biographical information about the Fund’s Trustees as of the printing of this report, including their principal occupations during the past five years, although specific titles for individuals may have varied over the period. The year set forth beneath Length of Service in the table below is the year in which the Trustee was first appointed or elected as Trustee to any Fund currently in the Columbia Funds Complex or a predecessor thereof. Under current Board policy, each Trustee generally serves until December 31 of the year such Trustee turns seventy-five (75).

Independent trustees

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
George S. Batejan c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2017	Executive Vice President, Global Head of Technology and Operations, Janus Capital Group, Inc., 2010-2016	161	Former Chairman of the Board, NICSA (National Investment Company Services Association) (Executive Committee, Nominating Committee and Governance Committee), 2014-2016; former Director, Intech Investment Management, 2011-2016; former Board Member, Metro Denver Chamber of Commerce, 2015-2016; former Advisory Board Member, University of Colorado Business School, 2015-2018; former Board Member, Chase Bank International, 1993-1994

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Kathleen Blatz c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2006	Attorney, specializing in arbitration and mediation; Trustee of Gerald Rauenhorst 1982 Trusts, since 2020; Chief Justice, Minnesota Supreme Court, 1998-2006; Associate Justice, Minnesota Supreme Court, 1996-1998; Fourth Judicial District Court Judge, Hennepin County, 1994-1996; Attorney in private practice and public service, 1984-1993; State Representative, Minnesota House of Representatives, 1979-1993, which included service on the Tax and Financial Institutions and Insurance Committees; Member and Interim Chair, Minnesota Sports Facilities Authority, January-July 2017; Interim President and Chief Executive Officer, Blue Cross and Blue Shield of Minnesota (health care insurance), February-July 2018, April-October 2021	161	Former Trustee, Blue Cross and Blue Shield of Minnesota, 2009-2021 (Chair of the Business Development Committee, 2014-2017; Chair of the Governance Committee, 2017-2019); former Member and Chair of the Board, Minnesota Sports Facilities Authority, January 2017-July 2017; former Director, Robina Foundation, 2009-2020 (Chair, 2014-2020); Director, Richard M. Schulze Family Foundation, since 2021
Pamela G. Carlton c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Chair since 2023; Trustee since 2007	President, Springboard – Partners in Cross Cultural Leadership (consulting company), since 2003; Managing Director of US Equity Research, JP Morgan Chase, 1999-2003; Director of US Equity Research, Chase Asset Management, 1996-1999; Co-Director Latin America Research, 1993-1996, COO Global Research, 1992-1996, Co-Director of US Research, 1991-1992, Investment Banker, 1982-1991, Morgan Stanley; Attorney, Cleary Gottlieb Steen & Hamilton LLP, 1980-1982	161	Trustee, New York Presbyterian Hospital Board, since 1996; Director, DR Bank (Audit Committee, since 2017 and Audit Committee Chair, since November 2023); Director, Evercore Inc. (Audit Committee, Nominating and Governance Committee) (financial services company), since 2019; Director, Apollo Commercial Real Estate Finance, Inc. (Chair, Nominating and Governance Committee), since 2021; the Governing Council of the Independent Directors Council (IDC), since 2021
Janet Langford Carrig c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1957	Trustee since 1996	Senior Vice President, General Counsel and Corporate Secretary, ConocoPhillips (independent energy company), September 2007-October 2018	161	Director, EQT Corporation (natural gas producer), since 2019; former Director, Whiting Petroleum Corporation (independent oil and gas company), 2020-2022
J. Kevin Connaughton c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1964	Trustee since 2020	CEO and President, RhodeWay Financial (non-profit financial planning firm), since December 2022; Member, FINRA National Adjudicatory Council, January 2020-December 2023; Adjunct Professor of Finance, Bentley University January 2018-April 2023; Consultant to Independent Trustees of CFVIT and CFST I from March 2016 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Managing Director and General Manager of Mutual Fund Products, Columbia Management Investment Advisers, LLC, May 2010-February 2015; President, Columbia Funds, 2008-2015; and senior officer of Columbia Funds and affiliated funds, 2003-2015	159	Former Director, The Autism Project, March 2015-December 2021; former Member of the Investment Committee, St. Michael’s College, November 2015-February 2020; former Trustee, St. Michael’s College, June 2017-September 2019; former Trustee, New Century Portfolios (former mutual fund complex), January 2015-December 2017

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Olive M. Darragh c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1962	Trustee since 2020	Managing Director of Darragh Inc. (strategy and talent management consulting firm), since 2010; Founder and CEO, Zolio, Inc. (investment management talent identification platform), since 2004; Consultant to Independent Trustees of CFVIT and CFST I from June 2019 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Partner, Tudor Investments, 2004-2010; Senior Partner, McKinsey & Company (consulting), 1990-2004; Touche Ross CPA, 1985-1988	159	Treasurer, Edinburgh University US Trust Board, since January 2023; Member, HBS Community Action Partners Board, since September 2022; former Director, University of Edinburgh Business School (Member of US Board), 2004-2019; former Director, Boston Public Library Foundation, 2008-2017
Patricia M. Flynn c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1950	Trustee since 2004	Professor Emeritus of Economics and Management, Bentley University, since 2023; Professor of Economics and Management, Bentley University, 1976-2023; Dean, McCallum Graduate School of Business, Bentley University, 1992-2002	161	Former Trustee, MA Taxpayers Foundation, 1997-2022; former Director, The MA Business Roundtable, 2003-2019; former Chairperson, Innovation Index Advisory Committee, MA Technology Collaborative, 1997-2020
Brian J. Gallagher c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2017	Retired; Partner with Deloitte & Touche LLP and its predecessors, 1977-2016	161	Trustee, Catholic Schools Foundation, since 2004
Douglas A. Hacker c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1955	Trustee since 1996	Independent business executive, since May 2006; Executive Vice President – Strategy of United Airlines, December 2002 - May 2006; President of UAL Loyalty Services (airline marketing company), September 2001-December 2002; Executive Vice President and Chief Financial Officer of United Airlines, July 1999-September 2001	161	Director, SpartanNash Company (food distributor), since November 2013 (Chair of the Board, since May 2021); Director, Aircastle Limited (aircraft leasing), since August 2006 (Chair of Audit Committee); former Director, Nash Finch Company (food distributor), 2005-2013; former Director, SeaCube Container Leasing Ltd. (container leasing), 2010-2013; and former Director, Travelport Worldwide Limited (travel information technology), 2014-2019
Nancy T. Lukitsh c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1956	Trustee since 2011	Senior Vice President, Partner and Director of Marketing, Wellington Management Company, LLP (investment adviser), 1997-2010; Chair, Wellington Management Portfolios (commingled non-U.S. investment pools), 2007-2010; Director, Wellington Trust Company, NA and other Wellington affiliates, 1997-2010	159	None

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
David M. Moffett c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1952	Trustee since 2011	Retired; former Chief Executive Officer of Freddie Mac and Chief Financial Officer of U.S. Bank	161	Director, CSX Corporation (transportation suppliers); Director, PayPal Holdings Inc. (payment and data processing services); former Director, eBay Inc. (online trading community), 2007-2015; and former Director, CIT Bank, CIT Group Inc. (commercial and consumer finance), 2010-2016; former Senior Adviser to The Carlyle Group (financial services), March 2008-September 2008; former Governance Consultant to Bridgewater Associates, January 2013-December 2015
Catherine James Paglia c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1952	Trustee since 2004	Director, Enterprise Asset Management, Inc. (private real estate and asset management company), since September 1998; Managing Director and Partner, Interlaken Capital, Inc., 1989-1997; Vice President, 1982-1985, Principal, 1985-1987, Managing Director, 1987-1989, Morgan Stanley; Vice President, Investment Banking, 1980-1982, Associate, Investment Banking, 1976-1980, Dean Witter Reynolds, Inc.	161	Director, Valmont Industries, Inc. (irrigation systems manufacturer), since 2012; Trustee, Carleton College (on the Investment Committee), since 1987; Trustee, Carnegie Endowment for International Peace (on the Investment Committee), since 2009
Natalie A. Trunow c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1967	Trustee since 2020	Chief Executive Officer, Millennial Portfolio Solutions LLC (asset management and consulting services), January 2016-January 2021; Non-executive Member of the Investment Committee and Valuation Committee, Sarona Asset Management Inc. (private equity firm) since September 2019; Advisor, Horizon Investments (asset management and consulting services), August 2018-January 2022; Advisor, Paradigm Asset Management, November 2016-January 2022; Consultant to Independent Trustees of CFVIT and CFST I from September 2016 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Director of Investments/Consultant, Casey Family Programs, April 2016-November 2016; Senior Vice President and Chief Investment Officer, Calvert Investments, August 2008-January 2016; Section Head and Portfolio Manager, General Motors Asset Management, June 1997-August 2008	159	Independent Director, Investment Committee, Health Services for Children with Special Needs, Inc., 2010-2021; Independent Director, (Executive Committee and Chair, Audit Committee), Consumer Credit Counseling Services (formerly Guidewell Financial Solutions), since 2016; Independent Director, (Investment Committee), Sarona Asset Management, since 2019
Sandra L. Yeager c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1964	Trustee since 2017	Retired; President and founder, Hanoverian Capital, LLC (SEC registered investment advisor firm), 2008-2016; Managing Director, DuPont Capital, 2006-2008; Managing Director, Morgan Stanley Investment Management, 2004-2006; Senior Vice President, Alliance Bernstein, 1990-2004	161	Former Director, NAPE (National Alliance for Partnerships in Equity) Education Foundation, October 2016-October 2020; Advisory Board, Jennersville YMCA, June 2022-June 2023

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Interested trustee affiliated with Investment Manager**

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during the past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Daniel J. Beckman c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1962	Trustee since November 2021 and President since June 2021	President and Principal Executive Officer of the Columbia Funds, since June 2021; Vice President, Columbia Management Investment Advisers, LLC, since April 2015; formerly, Vice President – Head of North America Product, Columbia Management Investment Advisers, LLC, April 2015 – December 2023; President and Principal Executive Officer, Columbia Acorn/Wanger Funds, since July 2021	161	Director, Ameriprise Trust Company, since October 2016; Director, Columbia Management Investment Distributors, Inc., since November 2018; Board of Governors, Columbia Wanger Asset Management, LLC, since January 2022

The term “Columbia Funds Complex” as used herein includes Columbia Seligman Premium Technology Growth Fund, Tri-Continental Corporation and each series of Columbia Funds Series Trust (CFST), Columbia Funds Series Trust I (CFST I), Columbia Funds Series Trust II (CFST II), Columbia ETF Trust I (CET I), Columbia ETF Trust II (CET II), Columbia Funds Variable Insurance Trust (CFVIT) and Columbia Funds Variable Series Trust II (CFVST II). Messrs. Batejan, Beckman, Gallagher, Hacker and Moffett and Mses. Blatz, Carlton, Carrig, Flynn, Paglia, and Yeager serve as directors of Columbia Seligman Premium Technology Growth Fund and Tri-Continental Corporation.

Interested person (as defined under the 1940 Act) by reason of being an officer, director, security holder and/or employee of the Investment Manager or Ameriprise Financial.

The Statement of Additional Information has additional information about the Fund’s Board members and is available, without charge, upon request by calling 800.345.6611, visiting columbiathreadneedleus.com/investor/ or contacting your financial intermediary.

The Board has appointed officers who are responsible for day-to-day business decisions based on policies it has established. The officers serve at the pleasure of the Board. The following table provides basic information about the Officers of the Fund as of the printing of this report, including principal occupations during the past five years, although their specific titles may have varied over the period. In addition to Mr. Beckman, who is President and Principal Executive Officer, the Fund’s other officers are:

Fund officers

Name, address and year of birth	Position and year first appointed to position for any Fund in the Columbia Funds Complex or a predecessor thereof	Principal occupation(s) during past five years
Michael G. Clarke 290 Congress Street Boston, MA 02210 1969	Chief Financial Officer and Principal Financial Officer (2009); Senior Vice President (2019); Treasurer and Chief Accounting Officer (Principal Accounting Officer) (2024) for CFST, CFST I, CFST II, CFVIT and CFVST II	Senior Vice President and North America Head of Operations & Investor Services, Columbia Management Investment Advisers, LLC, since June 2023 (previously Senior Vice President and Head of Global Operations, March 2022 – June 2023, Vice President, Head of North America Operations, and Co-Head of Global Operations, June 2019 - February 2022 and Vice President – Accounting and Tax, May 2010 - May 2019); senior officer of Columbia Funds and affiliated funds, since 2002. Director, Ameriprise Trust Company, since June 2023.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Fund officers (continued)

Name, address and year of birth	Position and year first appointed to position for any Fund in the Columbia Funds Complex or a predecessor thereof	Principal occupation(s) during past five years
Marybeth Pilat 290 Congress Street Boston, MA 02210 1968	Treasurer and Chief Accounting Officer (Principal Accounting Officer) and Principal Financial Officer (2020) for CET I and CET II; Assistant Treasurer, CFST, CFST I, CFST II, CFVIT and CFVST II	Vice President – Product Pricing and Administration, Columbia Management Investment Advisers, LLC, since May 2017.
William F. Truscott 290 Congress Street Boston, MA 02210 1960	Senior Vice President (2001)	Formerly, Trustee/Director of Columbia Funds Complex or legacy funds, November 2001 - January 1, 2021; Chief Executive Officer, Global Asset Management, Ameriprise Financial, Inc., since September 2012; Chairman of the Board and President, Columbia Management Investment Advisers, LLC, since July 2004 and February 2012, respectively; Chairman of the Board and Chief Executive Officer, Columbia Management Investment Distributors, Inc., since November 2008 and February 2012, respectively; Chairman of the Board and Director, TAM UK International Holdings Limited, since July 2021; formerly Chairman of the Board and Director, Threadneedle Asset Management Holdings, Sàrl, March 2013 – December 2022 and December 2008 – December 2022, respectively; senior executive of various entities affiliated with Columbia Threadneedle Investments.
Christopher O. Petersen 5228 Ameriprise Financial Center Minneapolis, MN 55474 1970	Senior Vice President and Assistant Secretary (2021)	Formerly, Trustee/Director of funds within the Columbia Funds Complex, July 1, 2020 - November 22, 2021; Senior Vice President and Assistant General Counsel, Ameriprise Financial, Inc., since September 2021 (previously Vice President and Lead Chief Counsel, January 2015 - September 2021); formerly, President and Principal Executive Officer of the Columbia Funds, 2015 - 2021; officer of Columbia Funds and affiliated funds, since 2007.
Thomas P. McGuire 290 Congress Street Boston, MA 02210 1972	Senior Vice President and Chief Compliance Officer (2012)	Vice President – Asset Management Compliance, Ameriprise Financial, Inc., since May 2010; Chief Compliance Officer, Columbia Acorn/Wanger Funds, since December 2015; formerly, Chief Compliance Officer, Ameriprise Certificate Company, September 2010 – September 2020.
Ryan C. Larrenaga 290 Congress Street Boston, MA 02210 1970	Senior Vice President (2017), Chief Legal Officer (2017), and Secretary (2015)	Vice President and Chief Counsel, Ameriprise Financial, Inc., since August 2018 (previously Vice President and Group Counsel, August 2011 - August 2018); Chief Legal Officer, Columbia Acorn/Wanger Funds, since September 2020; officer of Columbia Funds and affiliated funds, since 2005.
Michael E. DeFao 290 Congress Street Boston, MA 02210 1968	Vice President (2011) and Assistant Secretary (2010)	Vice President and Chief Counsel, Ameriprise Financial, Inc., since May 2010; Vice President, Chief Legal Officer and Assistant Secretary, Columbia Management Investment Advisers, LLC, since October 2021 (previously Vice President and Assistant Secretary, May 2010 – September 2021).
Lyn Kephart-Strong 5903 Ameriprise Financial Center Minneapolis, MN 55474 1960	Vice President (2015)	Vice President, Global Investment Operations Services, Columbia Management Investment Advisers, LLC, since 2010; President, Columbia Management Investment Services Corp., since October 2014; President, Ameriprise Trust Company, since January 2017.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Liquidity Risk Management Program

(Unaudited)

Pursuant to Rule 22e-4 under the 1940 Act, the Fund has adopted a liquidity risk management program (Program). The Program’s principal objectives include assessing, managing and periodically reviewing the Fund’s liquidity risk. Liquidity risk is defined as the risk that the Fund could not meet redemption requests without significant dilution of remaining investors’ interests in the Fund.

The Board has appointed the Investment Manager as the program administrator for the Fund’s Program. The Investment Manager has delegated oversight of the Program to its Liquidity Risk Management Committee (the Committee). At a board meeting during the fiscal period, the Committee provided the Board with a report addressing the operations of the program and assessing its adequacy and effectiveness of implementation for the period January 1, 2023, through December 31, 2023, including:

•

the Fund had sufficient liquidity to both meet redemptions and operate effectively on behalf of shareholders;

•

there were no material changes to the Program during the period;

•

the implementation of the Program was effective to manage the Fund’s liquidity risk; and

•

the Program operated adequately during the period.

There can be no assurance that the Program will achieve its objectives in the future. Please refer to the Fund’s prospectus for more information regarding the Fund’s exposure to liquidity risk and other principal risks to which an investment in the Fund may be subject.

Columbia California Intermediate Municipal Bond Fund | Annual Report 2024

Columbia Short Duration Municipal Bond Fund

Annual Report

April 30, 2024

Not FDIC or NCUA Insured

No Financial Institution Guarantee

May Lose Value

Table of Contents

Fund at a Glance	3
Manager Discussion of Fund Performance	5
Understanding Your Fund’s Expenses	7
Portfolio of Investments	8
Statement of Assets and Liabilities	20
Statement of Operations	21
Statement of Changes in Net Assets	22
Financial Highlights	24
Notes to Financial Statements	28
Report of Independent Registered Public Accounting Firm	37
Federal Income Tax Information	38
Trustees and Officers	38
Liquidity Risk Management Program	44

If you elect to receive the shareholder report for Columbia Short Duration Municipal Bond Fund (the Fund) in paper, mailed to you, the Fund mails one shareholder report to each shareholder address, unless such shareholder elects to receive shareholder reports from the Fund electronically via e-mail or by having a paper notice mailed to you (Postcard Notice) that your Fund’s shareholder report is available at the Columbia funds’ website (columbiathreadneedleus.com/investor/). If you would like more than one report in paper to be mailed to you, or would like to elect to receive reports via e-mail or access them through Postcard Notice, please call shareholder services at 800.345.6611 and additional reports will be sent to you.

Proxy voting policies and procedures

Quarterly schedule of investments

Additional Fund information

Fund investment manager

Columbia Management Investment Advisers, LLC (the Investment Manager)

290 Congress Street

Boston, MA 02210

Fund distributor

Columbia Management Investment Distributors, Inc.

290 Congress Street

Boston, MA 02210

Fund transfer agent

Columbia Management Investment Services Corp.

P.O. Box 219104

Kansas City, MO 64121-9104

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Fund at a Glance

(Unaudited)

Investment objective

The Fund seeks current income exempt from federal income tax, consistent with minimal fluctuation of principal.

Portfolio management

Douglas Rangel, CFA

Lead Portfolio Manager

Managed the Fund since 2022

Catherine Stienstra

Portfolio Manager

Managed Fund since 2012

Average annual total returns (%) (for the period ended April 30, 2024)
		Inception	1 Year	5 Years	10 Years
Class A	Excluding sales charges	11/02/93	2.23	0.74	0.74
	Including sales charges		1.22	0.55	0.64
Advisor Class		03/19/13	2.48	0.99	1.02
Institutional Class		10/07/93	2.48	0.99	1.00
Institutional 2 Class		11/08/12	2.43	1.02	1.06
Institutional 3 Class*		03/01/17	2.58	1.08	1.06
Bloomberg 1-5 Year Municipal Bond Index			2.07	1.04	1.19

Returns for Class A shares are shown with and without the maximum initial sales charge of 1.00%. The Fund’s other share classes are not subject to sales charges and have limited eligibility. Please see the Fund’s prospectus for details. Performance for different share classes will vary based on differences in sales charges and fees associated with each share class. All results shown assume reinvestment of distributions during the period. Returns do not reflect the deduction of taxes that a shareholder may pay on Fund distributions or on the redemption of Fund shares. Performance results reflect the effect of any fee waivers or reimbursements of Fund expenses by Columbia Management Investment Advisers, LLC and/or any of its affiliates. Absent these fee waivers or expense reimbursement arrangements, performance results would have been lower.

The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.

The Bloomberg 1-5 Year Municipal Bond Index is an unmanaged index which consists of a broad selection of investment-grade general obligation and revenue municipal bonds of maturities ranging from one year to five years.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Fund at a Glance (continued)

(Unaudited)

Performance of a hypothetical $10,000 investment (April 30, 2014 — April 30, 2024)

The chart above shows the change in value of a hypothetical $10,000 investment in Class A shares of Columbia Short Duration Municipal Bond Fund during the stated time period, and does not reflect the deduction of taxes that a shareholder may pay on Fund distributions or on the redemption of Fund shares.

Quality breakdown (%) (at April 30, 2024)
AAA rating	9.8
AA rating	37.7
A rating	34.5
BBB rating	10.1
BB rating	1.0
Not rated	6.9
Total	100.0

Percentages indicated are based upon total fixed income investments.

Top Ten States/Territories (%) (at April 30, 2024)
New York	15.9
Texas	8.1
New Jersey	6.3
Massachusetts	6.1
California	4.8
Illinois	4.8
Pennsylvania	4.0
Virginia	3.2
Wisconsin	3.2
Alabama	3.1

Percentages indicated are based upon total investments excluding Money Market Funds and investments in derivatives, if any.

For further detail about these holdings, please refer to the section entitled “Portfolio of Investments.”

Fund holdings are as of the date given, are subject to change at any time, and are not recommendations to buy or sell any security.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Manager Discussion of Fund Performance

(Unaudited)

For the 12-month period that ended April 30, 2024, Class A shares of Columbia Short Duration Municipal Bond Fund returned 2.23% excluding sales charges. Institutional Class shares returned 2.48%. The Fund’s benchmark, the Bloomberg 1-5 Year Municipal Bond Index (Bloomberg Index), returned 2.07% for the same period.

Market overview

During the annual period, the municipal bond market, and fixed-income markets broadly, experienced notable volatility. Short-term municipal bond yields traded in a wide range of 150 basis points during the annual period, following the similar trend of U.S. Treasury yields, as market expectations for interest rate cuts by the U.S. Federal Reserve (Fed) were pushed to later in 2024. (A basis point is 1/100th of a percentage point.) Indeed, an increasingly resilient U.S. economy, strong labor market and slowed progress toward the Fed’s 2% inflation target left fixed-income markets to grapple with a period of “higher for longer” interest rates. While such an interest rate scenario offered some positives for the long-term fixed-income market, it also put upward pressure on shorter-term U.S. Treasury and municipal bond yields, dominating investor sentiment, weighing on returns and prompting a build-up of cash on the sidelines during the annual period.

Municipal bond supply during the annual period was more robust than the market anticipated, particularly in the first four months of 2024, which as of April 30, was approximately 30% higher than during the same period one year prior. While historically an influx of supply might push yields higher or drive spreads, or yield differentials to duration-equivalent AAA-rated municipal bonds, wider, new supply during the annual period was met with strong demand. Driven partly by separately managed account buyers and partly by modest inflows into municipal bond funds, the increase in supply was easily digested by the municipal bond market. Lower quality and high yield municipal bond supply, which has been scarce in recent years, was met with especially strong demand.

Amid this backdrop, fundamental factors were broadly supportive for the municipal bond market during the annual period. Most state and local governments were in healthy financial positions, with many boasting record surpluses. Many revenue segments were equally healthy, and while the pace of ratings agencies’ upgrades slowed from the COVID stimulus-induced flurry of activity we saw in the prior annual period, upgrades still outpaced downgrades during the annual period ended April 30, 2024. Even within sectors that have been slower to recover, such as health care and higher education, we saw signs of stabilization and opportunities to add value via skilled credit selection.

As a whole, lower quality municipal bonds outperformed higher quality securities during the annual period. That said, there was significant dispersion among different quality and maturity segments of the municipal bond market. For example, as measured by the Bloomberg Municipal Bond Index, BBB-rated issues posted a return of 4.30% for the annual period, while AAA-rated municipal bonds gained 1.37%. Similarly, municipal bonds with maturities of one- to two-years and long-term bonds with maturities of 22 years and longer returned 2.73% and 2.53%, respectively. Shorter/intermediate maturity municipal bonds gained more modestly, with the three-year and five-year market segments returning 1.90% and 1.58%, respectively.

For the annual period as a whole, the short-term municipal bond market performed in line with the broader municipal bond market. However, the short-term municipal bond market significantly outperformed U.S. Treasuries and the broad U.S. fixed-income market. The Bloomberg Index returned 2.07% as compared to a 2.08% return for the Bloomberg Municipal Bond Index, a -2.80% return for the Bloomberg Treasury Index and a -1.47% return for the Bloomberg U.S. Aggregate Bond Index for the annual period.

The Fund’s notable contributors during the period

•

Duration and yield curve positioning contributed most positively to the Fund’s relative results during the annual period.

○

The Fund’s neutral to slightly short duration positioning relative to the Bloomberg Index proved beneficial as municipal bond yields rose during the annual period.

○

Having a rather barbelled yield curve positioning was also additive given attractive short-term yields.

 More specifically, exposure to short-term notes, variable rate demand notes and cash was positive given the inversion at the short-term end of the yield curve, wherein yields on very short-term maturities were higher than those on somewhat longer maturities within the short-term segment of the yield curve.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Manager Discussion of Fund Performance (continued)

(Unaudited)

 At the same time, exposure to issues with maturities slightly longer than included in the Bloomberg Index, i.e., with maturities in the five- to seven-year range, helped keep pace during volatile times when yields rallied for extended periods.

•

Sector allocation positioning overall added value to the Fund’s relative results. Overweighted allocations to the continuing care retirement communities (CCRC), airports, transportation and housing sectors, which each outpaced the Bloomberg Index during the annual period, helped most.

•

Security selection as a whole and across most sectors boosted the Fund’s relative results during the annual period. Especially adding value was issue selection among CCRC, charter schools, education, electric and local general obligation bonds.

•

Strong demand for lower quality issues aided exposure in sectors like CCRCs and charter schools. In fact, the Fund’s overall credit quality positioning proved beneficial during the annual period. While the overall average credit quality of the Fund’s portfolio remained quite high at AA-, having only a modest exposure to the AAA portion of the municipal bond market enabled us to have greater portfolio exposure to credit quality segments with a yield advantage over AAA securities, including those in the AA, A and BBB investment-grade categories.

•

From a states perspective, an overweight to Illinois general obligation bonds and security selection in Massachusetts were additive.

The Fund’s notable detractors during the period

•

Having modest underweights to the tobacco and prepaid gas sectors, which each outpaced the Bloomberg Index during the annual period, modestly detracted from the Fund’s relative results.

•

Individual issue selection within the housing, prepaid gas and airports bonds sectors also hurt the Fund’s relative results.

Fixed-income securities present issuer default risk. The Fund invests substantially in municipal securities and will be affected by tax, legislative, regulatory, demographic or political changes, as well as changes impacting a state’s financial, economic or other conditions. A relatively small number of tax-exempt issuers may necessitate the Fund investing more heavily in a single issuer and, therefore, be more exposed to the risk of loss than a fund that invests more broadly. Prepayment and extension risk exists because the timing of payments on a loan, bond or other investment may accelerate when interest rates fall or decelerate when interest rates rise which may reduce investment opportunities and potential returns. Market risk may affect a single issuer, sector of the economy, industry or the market as a whole. A rise in interest rates may result in a price decline of fixed-income instruments held by the Fund, negatively impacting its performance and NAV. Falling rates may result in the Fund investing in lower yielding debt instruments, lowering the Fund’s income and yield. These risks may be heightened for longer maturity and duration securities. Federal and state tax rules apply to capital gain distributions and any gains or losses on sales. Income may be subject to state, local or alternative minimum taxes. See the Fund’s prospectus for more information on these and other risks.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Understanding Your Fund’s Expenses

(Unaudited)

Analyzing your Fund’s expenses

Compare with other funds

November 1, 2023 — April 30, 2024
	Account value at the beginning of the period ($)		Account value at the end of the period ($)		Expenses paid during the period ($)		Fund’s annualized expense ratio (%)
	Actual	Hypothetical	Actual	Hypothetical	Actual	Hypothetical	Actual
Class A	1,000.00	1,000.00	1,030.10	1,021.68	3.23	3.22	0.64
Advisor Class	1,000.00	1,000.00	1,031.40	1,022.92	1.97	1.96	0.39
Institutional Class	1,000.00	1,000.00	1,031.40	1,022.92	1.97	1.96	0.39
Institutional 2 Class	1,000.00	1,000.00	1,031.70	1,023.17	1.72	1.71	0.34
Institutional 3 Class	1,000.00	1,000.00	1,032.90	1,023.37	1.52	1.51	0.30

Had Columbia Management Investment Advisers, LLC and/or certain of its affiliates not waived/reimbursed certain fees and expenses, account value at the end of the period would have been reduced.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments

April 30, 2024

(Percentages represent value of investments compared to net assets)

Investments in securities

Floating Rate Notes 0.2%
Issue Description	Yield	Principal Amount ($)	Value ($)
New York 0.2%
New York City Water & Sewer System(a),(b)
Revenue Bonds
2nd General Resolution
Series 2013 (JPMorgan Chase Bank)
06/15/2050	3.800%	700,000	700,000
Total Floating Rate Notes (Cost $700,000)			700,000

Municipal Bonds 95.4%
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Alabama 3.1%
Black Belt Energy Gas District
Refunding Revenue Bonds
Series 2022D1 (Mandatory Put 06/01/27)
07/01/2052	4.000%	3,000,000	3,008,334
Revenue Bonds
Project No. 4
Series 2019A-1 (Mandatory Put 12/01/25)
12/01/2049	4.000%	2,000,000	2,001,404
County of Jefferson Sewer
Refunding Revenue Bonds
Series 2024
10/01/2028	5.000%	1,750,000	1,861,574
10/01/2029	5.000%	1,500,000	1,619,754
Industrial Development Board of the City of Mobile
Senior Revenue Bonds
Alabama Power Co. - Barry Plant Project
Series 2020 (Mandatory Put 06/26/25)
06/01/2034	1.000%	1,150,000	1,107,935
Lower Alabama Gas District (The)
Revenue Bonds
Gas Project
Series 2020 (Mandatory Put 12/01/25)
12/01/2050	4.000%	600,000	599,426
Total			10,198,427
Arizona 2.4%
Chandler Industrial Development Authority(c)
Revenue Bonds
Intel Corp. Project
Series 2022-1 (Mandatory Put 09/01/27)
09/01/2042	5.000%	5,000,000	5,105,663

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
City of Phoenix Civic Improvement Corp.(c)
Revenue Bonds
Junior Lien - Airport
Series 2019B
07/01/2026	5.000%	990,000	1,013,214
Coconino County Pollution Control Corp.
Refunding Revenue Bonds
Nevada Power Co.
Series 2023 (Mandatory Put 03/31/26)
09/01/2032	4.125%	500,000	495,234
Maricopa County Industrial Development Authority(d)
Refunding Revenue Bonds
Banner Health Obligation
Series 2019 (Mandatory Put 10/18/24)
Muni Swap Index Yield + 0.570% 01/01/2035	4.340%	1,275,000	1,273,577
Total			7,887,688
California 4.8%
Anaheim Public Financing Authority
Refunding Revenue Bonds
Anaheim Public Improvement Projects
Series 2019
09/01/2028	5.000%	1,000,000	1,068,972
California Infrastructure & Economic Development Bank(c),(e)
Revenue Bonds
Brightline West Passenger Rail Project
Series 2024 (Mandatory Put 01/30/25)
01/01/2050	3.950%	2,400,000	2,399,897
California Municipal Finance Authority(c)
Revenue Bonds
Republic Services, Inc.
Series 2024 (Mandatory Put 03/01/24)
02/28/2054	3.875%	1,000,000	992,255
California Public Finance Authority
Refunding Revenue Bonds
Henry Mayo Newhall Hospital
Series 2021
10/15/2025	4.000%	400,000	396,310
City of Vernon Electric System
Refunding Revenue Bonds
Series 2022A
08/01/2026	5.000%	600,000	614,536
Corona-Norco Unified School District(f)
Unlimited General Obligation Bonds
Capital Appreciation
Series 2002D (AGM)
09/01/2027	0.000%	2,000,000	1,777,820

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Los Angeles Unified School District
Unlimited General Obligation Refunding Bonds
Series 2024A
07/01/2029	5.000%	3,000,000	3,294,833
San Francisco City & County Airport Commission - San Francisco International Airport(c)
Refunding Revenue Bonds
Second Series 2023A
05/01/2028	5.000%	5,000,000	5,258,479
Total			15,803,102
Colorado 3.0%
City & County of Denver Airport System(c)
Refunding Revenue Bonds
Series 2017A
11/15/2030	5.000%	1,925,000	2,003,438
Revenue Bonds
Series 2022A
11/15/2028	5.000%	5,000,000	5,289,723
Colorado Health Facilities Authority
Revenue Bonds
Aberdeen Ridge
Series 2021B
05/15/2028	2.125%	1,750,000	1,656,982
E-470 Public Highway Authority(d)
Refunding Revenue Bonds
Series 2021B (Mandatory Put 09/01/24)
0.7 x SOFR + 0.350% 09/01/2039	3.914%	1,000,000	998,437
Total			9,948,580
Connecticut 0.2%
State of Connecticut Special Tax
Revenue Bonds
Series 2022A
07/01/2027	5.000%	500,000	527,256
District of Columbia 1.4%
District of Columbia Housing Finance Agency
Revenue Bonds
Faircliff Plaza East Apartments Project
Series 2022 (FHA) (Mandatory Put 12/01/25)
12/01/2026	5.000%	1,450,000	1,464,568
Metropolitan Washington Airports Authority Aviation(c)
Refunding Revenue Bonds
Series 2020A
10/01/2025	5.000%	3,000,000	3,045,597
Total			4,510,165

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Florida 2.7%
City of Pompano Beach
Revenue Bonds
John Knox Village Project
Series 2021
01/01/2027	1.450%	1,310,000	1,242,241
County of Miami-Dade Seaport Department(c)
Refunding Revenue Bonds
Series 2023A
10/01/2027	5.000%	1,650,000	1,714,135
Duval County Public Schools
Certificate of Participation
Series 2022 (AGM)
07/01/2026	5.000%	2,125,000	2,197,565
Greater Orlando Aviation Authority(c)
Revenue Bonds
Series 2019A
10/01/2025	5.000%	2,000,000	2,032,328
Miami-Dade County Housing Finance Authority
Revenue Bonds
Cutler Vista
Series 2023 (Mandatory Put 09/01/25)
03/01/2027	5.000%	1,000,000	1,010,059
St. Johns County Industrial Development Authority
Refunding Revenue Bonds
Vicar’s Landing Project
Series 2021
12/15/2024	4.000%	145,000	144,224
12/15/2025	4.000%	180,000	177,417
Village Community Development District No. 13
Special Assessment Bonds
Series 2021
05/01/2026	1.800%	400,000	384,674
Total			8,902,643
Georgia 1.7%
Development Authority of Burke County (The)
Refunding Revenue Bonds
Georgia Power Co. Plant Vogtle Project
Series 2022 (Mandatory Put 08/19/25)
12/01/2049	2.875%	750,000	732,337
Georgia Power Company Plant Vogtle Project
Series 2024 (Mandatory Put 03/12/27)
10/31/2053	3.375%	350,000	345,183
Georgia State Road & Tollway Authority(e),(f)
Revenue Bonds
I-75 S Express Lanes Project
Series 2014 Escrowed to Maturity
06/01/2024	0.000%	305,000	303,930

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Main Street Natural Gas, Inc.
Revenue Bonds
Series 2019A
05/15/2024	5.000%	1,250,000	1,250,237
Series 2022B (Mandatory Put 06/01/29)
12/01/2052	5.000%	2,000,000	2,076,852
Series 2023C (Mandatory Put 09/01/30)
09/01/2053	5.000%	1,000,000	1,052,892
Total			5,761,431
Guam 0.7%
Guam Power Authority(g)
Refunding Revenue Bonds
Series 2022A
10/01/2025	5.000%	2,375,000	2,394,443
Illinois 4.8%
Illinois Development Finance Authority(f)
Revenue Bonds
Regency Park
Series 1991 Escrowed to Maturity
07/15/2025	0.000%	2,010,000	1,922,140
Illinois Finance Authority
Refunding Revenue Bonds
Lifespace Communities, Inc.
Series 2015
05/15/2024	5.000%	450,000	449,852
Illinois Finance Authority(b)
Refunding Revenue Bonds
OSF Healthcare System
Series 2020 (Mandatory Put 11/15/24)
05/15/2050	5.000%	4,250,000	4,250,644
Illinois Finance Authority(d)
Refunding Revenue Bonds
Presbyterian Homes
Series 2021 (Mandatory Put 05/01/26)
Muni Swap Index Yield + 0.700% 05/01/2042	4.470%	1,250,000	1,227,572
Illinois Housing Development Authority
Revenue Bonds
Senior
Series 2016A
10/01/2031	3.125%	915,000	853,596
State of Illinois
Unlimited General Obligation Bonds
Series 2021A
03/01/2025	5.000%	500,000	504,368
Series 2023B
05/01/2028	5.000%	300,000	315,687
05/01/2032	5.000%	3,500,000	3,855,191

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Unlimited General Obligation Refunding Bonds
Series 2022B
03/01/2025	5.000%	2,400,000	2,420,185
Total			15,799,235
Indiana 0.9%
City of Whiting(c)
Refunding Revenue Bonds
BP Products North America
Series 2019 (Mandatory Put 06/05/26)
12/01/2044	5.000%	1,000,000	1,016,624
Indianapolis Local Public Improvement Bond Bank(c)
Refunding Revenue Bonds
Indianapolis Airport
Series 2019
01/01/2026	5.000%	1,050,000	1,067,272
Indianapolis Airport Authority Project
Series 2023
01/01/2030	5.000%	1,000,000	1,067,173
Total			3,151,069
Iowa 1.0%
Iowa Finance Authority(c)
Revenue Bonds
Geno NW Iowa RNG, LLC Renewable Natural Gas Project
Series 2024 (Citibank NA) (Mandatory Put 04/01/26)
12/31/2041	3.875%	2,450,000	2,437,682
PEFA, Inc.
Revenue Bonds
Series 2019 (Mandatory Put 09/01/26)
09/01/2049	5.000%	1,000,000	1,018,373
Total			3,456,055
Kentucky 2.3%
City of Henderson(c),(e)
Revenue Bonds
Pratt Paper LLC Project
Series 2022
01/01/2032	3.700%	1,000,000	965,572
Kenton County School District Finance Corp.
Refunding Revenue Bonds
Series 2015B
10/01/2025	3.000%	1,995,000	1,965,521
Kentucky Interlocal School Transportation Association
Refunding Certificate of Participation
Series 2021
03/01/2025	1.250%	1,330,000	1,282,204
03/01/2026	1.250%	1,085,000	1,012,419

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Kentucky Public Energy Authority(d)
Revenue Bonds
Series 2019A-2 (Mandatory Put 06/01/25)
0.7 x SOFR + 1.234% 12/01/2049	4.798%	1,000,000	999,072
Kentucky Public Energy Authority
Revenue Bonds
Series 2020A (Mandatory Put 06/01/26)
12/01/2050	4.000%	1,355,000	1,344,260
Total			7,569,048
Louisiana 1.1%
Louisiana Local Government Environmental Facilities & Community Development Authority
Refunding Revenue Bonds
Entergy Louisiana LLC Project
Series 2021
06/01/2030	2.000%	1,250,000	1,078,171
Louisiana Public Facilities Authority(c),(e)
Revenue Bonds
Elementus Minerals LLC Project
Series 2023 (Mandatory Put 11/01/25)
10/01/2043	5.000%	2,500,000	2,511,742
Total			3,589,913
Maryland 2.3%
Maryland Community Development Administration
Revenue Bonds
Series 2021B
03/01/2027	0.900%	860,000	786,011
Maryland Economic Development Corp.(c)
Revenue Bonds
Green Bonds - Purple Line Light Rail Project
Series 2022
11/12/2028	5.000%	2,000,000	2,032,560
State of Maryland Department of Transportation
Refunding Revenue Bonds
Series 2022B
12/01/2027	5.000%	1,205,000	1,282,727
Revenue Bonds
2nd Issue
Series 2018
10/01/2024	5.000%	3,420,000	3,438,491
Total			7,539,789
Massachusetts 3.9%
Berkshire Regional Transit Authority
Revenue Notes
RAN Series 2023
07/25/2024	4.500%	3,500,000	3,500,229

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Massachusetts Development Finance Agency
Refunding Revenue Bonds
Berklee College of Music
Series 2016
10/01/2029	5.000%	1,000,000	1,032,149
Massachusetts Educational Financing Authority(c)
Revenue Bonds
Education Loan
Series 2014-I
01/01/2025	5.000%	3,000,000	3,019,128
Senior Series 2020B
07/01/2026	5.000%	1,250,000	1,270,479
Senior Series 2022B
07/01/2025	5.000%	250,000	253,079
07/01/2029	5.000%	825,000	858,593
Massachusetts Housing Finance Agency
Revenue Bonds
Sustainability Bonds
Series 2022-D3 (FHA)
12/01/2026	3.300%	1,000,000	986,198
Massachusetts Port Authority(c)
Refunding Revenue Bonds
BosFuel Project
Series 2019A
07/01/2026	5.000%	1,000,000	1,024,284
BOSFUEL Project
Series 2019A
07/01/2025	5.000%	1,000,000	1,007,699
Total			12,951,838
Michigan 1.6%
Michigan Finance Authority
Refunding Revenue Bonds
McLaren Health Care
Series 2021D-1
10/15/2026	0.900%	2,495,000	2,330,050
10/15/2027	1.100%	1,650,000	1,517,360
Michigan Finance Authority(h)
Refunding Revenue Bonds
Trinity Health
Series 2019 (Mandatory Put 02/01/25)
12/01/2044	5.000%	1,605,000	1,617,283
Total			5,464,693
Minnesota 0.6%
City of Wayzata
Refunding Revenue Bonds
Folkstone Senior Living Co.
Series 2019
08/01/2024	3.000%	100,000	99,775
08/01/2025	3.000%	200,000	197,726
08/01/2026	3.000%	250,000	244,721

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Minnesota Housing Finance Agency(c)
Revenue Bonds
Series 2020A (GNMA)
07/01/2024	1.450%	115,000	114,066
Series 2020D (GNMA)
07/01/2026	1.650%	360,000	334,708
Series 2020H
07/01/2024	0.700%	190,000	188,319
01/01/2025	0.800%	340,000	329,681
07/01/2025	0.850%	360,000	341,493
Total			1,850,489
Mississippi 0.9%
County of Warren(c)
Refunding Revenue Bonds
International Paper Co. Project
Series 2020 (Mandatory Put 06/16/25)
08/01/2027	1.600%	1,000,000	971,985
Mississippi Business Finance Corp.(c)
Revenue Bonds
Waste Management, Inc. Project
Series 2019 (Mandatory Put 06/03/24)
03/01/2027	2.200%	1,250,000	1,247,544
State of Mississippi Gaming Tax
Revenue Bonds
Series 2019A
10/15/2024	5.000%	750,000	752,596
Total			2,972,125
Missouri 1.3%
Kansas City Industrial Development Authority(c)
Revenue Bonds
Kansas City International Airport
Series 2019
03/01/2028	5.000%	3,810,000	3,964,379
Missouri Development Finance Board
Refunding Revenue Bonds
Crackerneck Creek Project
Series 2021
03/01/2026	5.000%	300,000	301,504
Total			4,265,883
Nebraska 0.6%
Gretna Public Schools
Unlimited General Obligation Bonds
Series 2022B
12/15/2027	5.000%	2,080,000	2,126,101

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Nevada 0.1%
State of Nevada Department of Business & Industry(e)
Revenue Bonds
Somerset Academy
Series 2018A
12/15/2029	4.500%	465,000	460,328
New Hampshire 1.1%
New Hampshire Business Finance Authority
Refunding Revenue Bonds
Springpoint Senior Living
Series 2021
01/01/2025	4.000%	290,000	287,611
01/01/2026	4.000%	265,000	260,515
New Hampshire Business Finance Authority(c),(d)
Refunding Revenue Bonds
Waste Management, Inc. Project
Series 2018 (Mandatory Put 07/01/24)
Muni Swap Index Yield + 0.375% 10/01/2033	4.145%	2,000,000	1,997,187
New Hampshire Business Finance Authority(c)
Refunding Revenue Bonds
Waste Management, Inc. Project
Series 2019 (Mandatory Put 07/01/24)
07/01/2027	2.150%	1,000,000	996,205
Total			3,541,518
New Jersey 6.3%
Camden County Improvement Authority (The)
Revenue Bonds
Northgate I Apartment Project
Series 2024 (FHA) (Mandatory Put 03/01/26)
03/01/2027	5.000%	975,000	991,031
City of Newark
Unlimited General Obligation Notes
BAN Series 2023B
09/27/2024	5.000%	2,000,000	2,002,493
New Jersey Economic Development Authority(c)
Refunding Revenue Bonds
New Jersey-American Water Company, Inc. Project
Series 2020
12/01/2025	0.850%	2,750,000	2,545,619
New Jersey Economic Development Authority
Refunding Revenue Bonds
Series 2015XX
06/15/2026	4.250%	2,355,000	2,355,768
New Jersey Health Care Facilities Financing Authority
Refunding Revenue Bonds
Hospital Asset Transformation Program
Series 2017
10/01/2031	5.000%	2,000,000	2,101,648

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Hospital Asset Transformation Project
Series 2017
10/01/2026	5.000%	650,000	668,063
New Jersey Higher Education Student Assistance Authority(c)
Revenue Bonds
Series 2015-1A
12/01/2027	4.000%	1,295,000	1,287,668
Series 2017-1A
12/01/2024	5.000%	3,750,000	3,772,148
Series 2023B
12/01/2028	5.000%	4,000,000	4,138,586
Senior Revenue Bonds
Series 2022B
12/01/2024	5.000%	885,000	890,227
Total			20,753,251
New Mexico 0.6%
City of Farmington
Refunding Revenue Bonds
Public Service Co. of New Mexico San Juan Project
Series 2020 (Mandatory Put 06/01/24)
06/01/2040	1.150%	2,000,000	1,994,236
New York 15.6%
City of New York
Unlimited General Obligation Bonds
Series 2024A
08/01/2029	5.000%	2,345,000	2,560,172
Unlimited General Obligation Refunding Bonds
Series 2023C
08/01/2027	5.000%	7,000,000	7,375,715
Huntington Local Development Corp.
Revenue Bonds
Fountaingate Garden Project
Series 2021B
07/01/2027	4.000%	970,000	935,566
Long Island Power Authority
Refunding Revenue Bonds
Series 2023F
09/01/2029	5.000%	3,000,000	3,309,411
New York City Transitional Finance Authority
Revenue Bonds
Subordinated Series 2018A-2
11/01/2027	5.000%	3,235,000	3,441,533
New York Liberty Development Corp.
Refunding Revenue Bonds
Green Bonds - 4 World Trade Center Project
Series 2021
11/15/2031	1.900%	950,000	800,755

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
New York State Dormitory Authority
Refunding Revenue Bonds
Series 2023A
03/15/2029	5.000%	3,250,000	3,534,689
Revenue Bonds
Series 2024A
03/15/2031	5.000%	1,700,000	1,907,881
New York State Thruway Authority
Refunding Revenue Bonds
Series 2024P
01/01/2027	5.000%	3,000,000	3,139,801
New York Transportation Development Corp.(c)
Refunding Revenue Bonds
American Airlines, Inc. Project
Series 2021
08/01/2026	2.250%	1,550,000	1,500,236
Revenue Bonds
LaGuardia Airport Terminal B Redevelopment Project
Series 2016
07/01/2030	5.000%	1,255,000	1,255,575
Port Authority of New York & New Jersey(c)
Refunding Revenue Bonds
Series 2018-207
09/15/2029	5.000%	5,000,000	5,219,441
Series 2021-223
07/15/2026	5.000%	4,130,000	4,230,156
Revenue Bonds
Consolidated One Hundred Eighty Four
Series 2014-25A
09/01/2028	5.000%	1,275,000	1,279,269
State of New York Mortgage Agency(c)
Refunding Revenue Bonds
Social Bonds
Series 2021-235
04/01/2026	1.050%	1,275,000	1,168,448
10/01/2026	1.150%	1,335,000	1,205,045
04/01/2027	1.300%	2,705,000	2,417,510
Revenue Bonds
Social Bonds
Series 2021-240
10/01/2024	0.850%	1,970,000	1,930,166
04/01/2025	0.950%	2,485,000	2,380,007
10/01/2025	1.050%	1,000,000	935,204
04/01/2026	1.200%	1,220,000	1,122,966
Total			51,649,546
North Carolina 1.6%
North Carolina Eastern Municipal Power Agency(i)
Revenue Bonds
Series 1993 (FGIC)
01/01/2025	3.100%	600,000	592,421

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
North Carolina Housing Finance Agency
Revenue Bonds
Home Ownership
Series 2021-47 (GNMA)
01/01/2028	1.050%	1,580,000	1,372,602
North Carolina Turnpike Authority
Refunding Revenue Bonds
Senior Lien
Series 2017
01/01/2025	5.000%	1,500,000	1,511,822
Series 2018
01/01/2025	5.000%	1,110,000	1,118,748
North Carolina Turnpike Authority(f)
Refunding Revenue Bonds
Series 2016C
07/01/2026	0.000%	780,000	704,724
Total			5,300,317
North Dakota 0.8%
North Dakota Housing Finance Agency(c)
Refunding Revenue Bonds
Social Bonds
Series 2021C
07/01/2024	0.800%	1,685,000	1,670,509
01/01/2025	0.950%	975,000	943,865
Total			2,614,374
Ohio 2.1%
City of Columbus
Unlimited General Obligation Bonds
Series 2023A
08/15/2024	5.000%	725,000	727,483
Ohio Air Quality Development Authority(c)
Refunding Revenue Bonds
Duke Energy Corp. Project
Series 2022 (Mandatory Put 06/01/27)
11/01/2039	4.250%	2,500,000	2,503,251
Ohio Turnpike & Infrastructure Commission
Refunding Revenue Bonds
Junior Lien - Infrastructure Projects
Series 2022
02/15/2026	5.000%	1,250,000	1,285,722
State of Ohio
Unlimited General Obligation Refunding Bonds
Series 2022A
06/15/2028	5.000%	2,250,000	2,421,146
Total			6,937,602

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Oklahoma 1.8%
Oklahoma County Independent School District No. 89 Oklahoma City
Unlimited General Obligation Bonds
Series 2023A
07/01/2027	3.000%	6,000,000	5,880,302
Oregon 0.1%
State of Oregon Housing & Community Services Department(h)
Revenue Bonds
Plaza Los Amigos Apartments Project
Series 2022 (Mandatory Put 02/01/25)
02/01/2026	3.000%	500,000	494,626
Pennsylvania 3.9%
Geisinger Authority
Refunding Revenue Bonds
Geisinger Health System Obligated Group
Series 2020 (Mandatory Put 02/15/27)
04/01/2043	5.000%	3,350,000	3,448,577
Pennsylvania Higher Education Assistance Agency(c)
Revenue Bonds
Series 2021A
06/01/2027	5.000%	1,315,000	1,342,957
Pennsylvania Housing Finance Agency(c)
Refunding Revenue Bonds
Social Bonds
Series 2021-134B
10/01/2025	5.000%	800,000	806,977
Pennsylvania Housing Finance Agency
Revenue Bonds
Series 2019-129
10/01/2034	2.950%	1,500,000	1,352,236
Series 2020-132A
04/01/2026	1.450%	1,400,000	1,305,206
10/01/2026	1.500%	1,500,000	1,383,237
Pennsylvania Turnpike Commission
Refunding Revenue Bonds
Series 2022B
12/01/2026	5.000%	275,000	286,697
Redevelopment Authority of the City of Philadelphia(c)
Refunding Revenue Bonds
Series 2015B
04/15/2027	5.000%	2,010,000	2,035,674
Southeastern Pennsylvania Transportation Authority
Revenue Bonds
Asset Improvement Program
Series 2022
06/01/2027	5.000%	1,000,000	1,051,011
Total			13,012,572

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Puerto Rico 0.8%
Commonwealth of Puerto Rico(g)
Unlimited General Obligation Bonds
Series 2021-A1
07/01/2025	5.375%	2,500,000	2,516,838
Rhode Island 1.3%
Rhode Island Housing & Mortgage Finance Corp.(c)
Refunding Revenue Bonds
Homeownership Opportunity
Series 2016
04/01/2026	2.600%	1,235,000	1,200,987
10/01/2026	2.650%	1,575,000	1,525,674
Rhode Island Student Loan Authority(c)
Revenue Bonds
Senior Program
Series 2019A
12/01/2024	5.000%	875,000	879,467
12/01/2035	2.875%	630,000	621,029
Total			4,227,157
South Carolina 0.2%
South Carolina Jobs-Economic Development Authority(c)
Revenue Bonds
International Paper Co. Project
Series 2023 (Mandatory Put 04/01/26)
04/01/2033	4.000%	850,000	849,666
Tennessee 0.4%
Metropolitan Government of Nashville & Davidson County Electric
Refunding Revenue Bonds
Series 2024B
05/15/2029	5.000%	1,200,000	1,313,146
Texas 7.1%
City of Houston Airport System(c)
Refunding Revenue Bonds
Subordinated Series 2023A (AGM)
07/01/2031	5.000%	3,250,000	3,548,372
City of Houston Combined Utility System(j)
Refunding Revenue Bonds
First Lien
Subordinated Series 2024A
11/15/2029	5.000%	500,000	548,787
County of Collin
Limited General Obligation Bonds
Series 2023
02/15/2028	5.000%	1,000,000	1,066,758
County of Harris Toll Road
Refunding Revenue Bonds
Series 2023A
08/15/2028	5.000%	500,000	538,240

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Dallas Fort Worth International Airport
Refunding Revenue Bonds
Series 2023B
11/01/2031	5.000%	2,000,000	2,256,879
Denton Independent School District
Unlimited General Obligation Bonds
Series 2023
08/15/2029	5.000%	1,750,000	1,918,986
Harris County Cultural Education Facilities Finance Corp.
Revenue Bonds
Baylor College of Medicine
Series 2024
05/15/2029	5.000%	1,250,000	1,348,355
Harris County Cultural Education Facilities Finance Corp.(d)
Revenue Bonds
Natus Medical, Inc.
Series 2019 (Mandatory Put 12/04/24)
Muni Swap Index Yield + 0.570% 12/01/2049	4.340%	2,000,000	1,996,145
Matagorda County Navigation District No. 1
Refunding Revenue Bonds
Central Power & Light
Series 2023
05/01/2030	4.250%	2,500,000	2,487,073
North Texas Tollway Authority
Refunding Revenue Bonds
Series 2023A
01/01/2027	5.000%	1,950,000	2,036,192
Plano Independent School District
Unlimited General Obligation Bonds
Series 2023
02/15/2028	5.000%	1,750,000	1,873,938
Port Beaumont Navigation District(c),(e)
Revenue Bonds
Jefferson Gulf Coast Energy Project
Series 2021
01/01/2026	1.875%	700,000	665,412
Spring Branch Independent School District
Unlimited General Obligation Bonds
Series 2022
02/01/2025	5.000%	1,000,000	1,010,602
Texas Home Collaborative
Revenue Bonds
1518 Apartments
Series 2023 (FHA) (Mandatory Put 10/01/26)
10/01/2041	5.000%	1,725,000	1,766,777
Texas Municipal Gas Acquisition & Supply Corp. III
Refunding Revenue Bonds
Senior
Series 2021
12/15/2028	5.000%	500,000	514,985
Total			23,577,501

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Utah 1.1%
City of Salt Lake City Airport(c)
Revenue Bonds
Series 2018A
07/01/2025	5.000%	2,685,000	2,713,279
Intermountain Power Agency
Revenue Bonds
Series 2023A
07/01/2029	5.000%	750,000	822,183
Total			3,535,462
Vermont 1.0%
Vermont Student Assistance Corp.(c)
Revenue Bonds
Student Loan
Senior Series 2018A
06/15/2025	5.000%	1,010,000	1,016,383
06/15/2026	5.000%	1,375,000	1,397,736
Series 2022A
06/15/2028	5.000%	985,000	1,013,304
Total			3,427,423
Virginia 3.2%
Amelia County Industrial Development Authority(c)
Refunding Revenue Bonds
Waste Management, Inc. Project
Series 2021
04/01/2027	1.450%	1,750,000	1,601,692
Fairfax County Redevelopment & Housing Authority(h)
Revenue Bonds
Dominion Square North Project
Series 2023 (Mandatory Put 01/01/28)
01/01/2045	5.000%	2,750,000	2,836,570
Henrico County Economic Development Authority(i)
Revenue Bonds
Registered Savrs
Series 1992 Escrowed to Maturity (AGM)
08/23/2027	7.403%	700,000	700,000
Virginia Beach Development Authority
Revenue Bonds
TEMPS 50 - Westminster-Canterbury on Chesapeake Bay
Series 2023
09/01/2029	5.375%	1,000,000	1,034,756
Virginia Housing Development Authority
Revenue Bonds
Series 2023E2 (Mandatory Put 07/01/25)
07/01/2055	3.900%	1,825,000	1,814,489

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Virginia Small Business Financing Authority
Refunding Revenue Bonds
LifeSpire of Virginia
Series 2021
12/01/2024	3.000%	220,000	217,828
12/01/2025	3.000%	230,000	224,309
12/01/2026	3.000%	235,000	226,718
Virginia Small Business Financing Authority(c)
Revenue Bonds
Pure Salmon Virginia LLC Project
Series 2023 (Mandatory Put 11/15/24)
11/01/2052	5.000%	2,000,000	1,998,372
Total			10,654,734
Washington 1.8%
City of Seattle
Unlimited General Obligation Bonds
Series 2015
12/01/2031	4.000%	1,810,000	1,818,630
Douglas County Public Utility District No. 1 Wells Hydroelectric Project(c)
Refunding Revenue Bonds
Series 2015A
09/01/2027	5.000%	830,000	840,788
Port of Seattle(c)
Refunding Revenue Bonds
Intermediate Lien
Series 2022
08/01/2028	5.000%	1,500,000	1,573,918
Revenue Bonds
Series 2018A
05/01/2028	5.000%	1,715,000	1,767,146
Total			6,000,482
Wisconsin 3.2%
Public Finance Authority(c)
Refunding Revenue Bonds
Waste Management, Inc. Project
Series 2016
05/01/2027	2.875%	5,350,000	5,139,191
State of Wisconsin
Unlimited General Obligation Refunding Bonds
Series 2022-4
05/01/2026	5.000%	1,230,000	1,271,372
Wisconsin Department of Transportation
Refunding Revenue Bonds
Series 2017-1
07/01/2028	5.000%	1,185,000	1,249,366
Wisconsin Health & Educational Facilities Authority(e)
Revenue Bonds
Forensic Science and Protective Medicine Collaboration, Inc. Project
Series 2024
08/01/2027	5.000%	2,500,000	2,543,060

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Municipal Bonds (continued)
Issue Description	Coupon Rate	Principal Amount ($)	Value ($)
Wisconsin Housing & Economic Development Authority
Revenue Bonds
Social Bonds
Series 2021C (GNMA)
03/01/2025	0.700%	425,000	408,442
Total			10,611,431
Total Municipal Bonds (Cost $322,906,213)			316,022,485

Municipal Short Term 3.6%
Issue Description	Yield	Principal Amount ($)	Value ($)
Massachusetts 2.1%
Brockton Area Transit Authority
Revenue Notes
RAN Series 2023
07/26/2024	4.340%	2,500,000	2,500,055
Merrimack Valley Regional Transit Authority
Revenue Notes
RAN Series 2023
06/21/2024	4.320%	3,000,000	3,000,050
Pioneer Valley Transit Authority
Revenue Notes
RAN Series 2023
07/12/2024	4.250%	1,500,000	1,501,016
Total			7,001,121
Texas 0.9%
Mission Economic Development Corp.(c)
Refunding Revenue Bonds
Republic Services, Inc. Project
Series 2019 (Mandatory Put 05/01/24)
01/01/2026	4.100%	3,000,000	3,000,000

Municipal Short Term (continued)
Issue Description	Yield	Principal Amount ($)	Value ($)
West Virginia 0.6%
West Virginia Economic Development Authority(c)
Revenue Bonds
Allegheny Metallurgical Project
Series 2023 (Mandatory Put 08/01/24)
01/01/2048	4.760%	1,875,000	1,873,139
Total Municipal Short Term (Cost $11,884,704)			11,874,260

Money Market Funds 0.0%
	Shares	Value ($)
BlackRock Liquidity Funds MuniCash, Institutional Shares, 3.515%(k)	134,063	134,076
Total Money Market Funds (Cost $134,063)		134,076
Total Investments in Securities (Cost $335,624,980)		328,730,821
Other Assets & Liabilities, Net		2,646,328
Net Assets		$331,377,149

Notes to Portfolio of Investments

(a)	The Fund is entitled to receive principal and interest from the guarantor after a day or a week’s notice or upon maturity. The maturity date disclosed represents the final maturity.
(b)	Represents a variable rate security where the coupon rate adjusts on specified dates (generally daily or weekly) using the prevailing money market rate. The interest rate shown was the current rate as of April 30, 2024.
(c)	Income from this security may be subject to alternative minimum tax.
(d)	Variable rate security. The interest rate shown was the current rate as of April 30, 2024.
(e)	Represents privately placed and other securities and instruments exempt from Securities and Exchange Commission registration (collectively, private placements), such as Section 4(a)(2) and Rule 144A eligible securities, which are often sold only to qualified institutional buyers. At April 30, 2024, the total value of these securities amounted to $9,849,941, which represents 2.97% of total net assets.
(f)	Zero coupon bond.
(g)	Municipal obligations include debt obligations issued by or on behalf of territories, possessions, or sovereign nations within the territorial boundaries of the United States. At April 30, 2024, the total value of these securities amounted to $4,911,281, which represents 1.48% of total net assets.
(h)	Represents a variable rate security with a step coupon where the rate adjusts according to a schedule for a series of periods, typically lower for an initial period and then increasing to a higher coupon rate thereafter. The interest rate shown was the current rate as of April 30, 2024.
(i)	Represents a variable rate security where the coupon adjusts periodically through an auction process.
(j)	Represents a security purchased on a when-issued basis.

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Portfolio of Investments (continued)

April 30, 2024

Notes to Portfolio of Investments (continued)

(k)	The rate shown is the seven-day current annualized yield at April 30, 2024.

Abbreviation Legend

AGM	Assured Guaranty Municipal Corporation
BAN	Bond Anticipation Note
FGIC	Financial Guaranty Insurance Corporation
FHA	Federal Housing Authority
GNMA	Government National Mortgage Association
RAN	Revenue Anticipation Note
SOFR	Secured Overnight Financing Rate

Fair value measurements

Fair value inputs are summarized in the three broad levels listed below:

■

Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

■

Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

The following table is a summary of the inputs used to value the Fund’s investments at April 30, 2024:

	Level 1 ($)	Level 2 ($)	Level 3 ($)	Total ($)
Investments in Securities
Floating Rate Notes	—	700,000	—	700,000
Municipal Bonds	—	316,022,485	—	316,022,485
Municipal Short Term	—	11,874,260	—	11,874,260
Money Market Funds	134,076	—	—	134,076
Total Investments in Securities	134,076	328,596,745	—	328,730,821

See the Portfolio of Investments for all investment classifications not indicated in the table.

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Statement of Assets and Liabilities

April 30, 2024

Assets
Investments in securities, at value
Unaffiliated issuers (cost $335,624,980)	$328,730,821
Cash	5,213
Receivable for:
Capital shares sold	472,442
Dividends	6,256
Interest	4,173,669
Expense reimbursement due from Investment Manager	1,598
Prepaid expenses	5,378
Total assets	333,395,377
Liabilities
Payable for:
Investments purchased on a delayed delivery basis	549,845
Capital shares redeemed	513,092
Distributions to shareholders	737,120
Management services fees	3,897
Distribution and/or service fees	390
Transfer agent fees	13,072
Compensation of board members	617
Other expenses	10,308
Deferred compensation of board members	189,887
Total liabilities	2,018,228
Net assets applicable to outstanding capital stock	$331,377,149
Represented by
Paid in capital	360,493,130
Total distributable earnings (loss)	(29,115,981 )
Total - representing net assets applicable to outstanding capital stock	$331,377,149
Class A
Net assets	$57,297,758
Shares outstanding	5,711,867
Net asset value per share	$10.03
Maximum sales charge	1.00%
Maximum offering price per share (calculated by dividing the net asset value per share by 1.0 minus the maximum sales charge for Class A shares)	$10.13
Advisor Class
Net assets	$32,052,446
Shares outstanding	3,192,297
Net asset value per share	$10.04
Institutional Class
Net assets	$51,406,399
Shares outstanding	5,124,270
Net asset value per share	$10.03
Institutional 2 Class
Net assets	$38,463,541
Shares outstanding	3,836,778
Net asset value per share	$10.02
Institutional 3 Class
Net assets	$152,157,005
Shares outstanding	15,174,837
Net asset value per share	$10.03

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Statement of Operations

Year Ended April 30, 2024

Net investment income
Income:
Dividends — unaffiliated issuers	$107,675
Interest	11,501,141
Total income	11,608,816
Expenses:
Management services fees	1,776,438
Distribution and/or service fees
Class A	156,242
Class C	16,175
Transfer agent fees
Class A	59,201
Advisor Class	40,649
Class C	1,537
Institutional Class	71,501
Institutional 2 Class	22,504
Institutional 3 Class	10,222
Custodian fees	11,128
Printing and postage fees	22,629
Registration fees	92,198
Accounting services fees	41,499
Legal fees	16,689
Interest on interfund lending	488
Compensation of chief compliance officer	72
Compensation of board members	15,518
Deferred compensation of board members	37,977
Other	18,620
Total expenses	2,411,287
Fees waived or expenses reimbursed by Investment Manager and its affiliates	(811,709 )
Fees waived by transfer agent
Institutional 3 Class	(10,222 )
Expense reduction	(40 )
Total net expenses	1,589,316
Net investment income	10,019,500
Realized and unrealized gain (loss) — net
Net realized gain (loss) on:
Investments — unaffiliated issuers	(6,479,419 )
Net realized loss	(6,479,419 )
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated issuers	6,300,714
Net change in unrealized appreciation (depreciation)	6,300,714
Net realized and unrealized loss	(178,705 )
Net increase in net assets resulting from operations	$9,840,795

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Statement of Changes in Net Assets (continued)

	Year Ended		Year Ended
	April 30, 2024		April 30, 2023
	Shares	Dollars ($)	Shares	Dollars ($)
Capital stock activity
Class A
Shares sold	1,243,511	12,464,562	4,585,621	45,834,971
Distributions reinvested	123,429	1,236,260	96,989	970,581
Shares redeemed	(2,729,251 )	(27,349,098 )	(5,500,323 )	(55,086,454 )
Net decrease	(1,362,311 )	(13,648,276 )	(817,713 )	(8,280,902 )
Advisor Class
Shares sold	635,099	6,372,716	2,469,079	24,718,526
Distributions reinvested	38,042	381,358	37,417	374,803
Shares redeemed	(2,771,725 )	(27,837,267 )	(4,874,214 )	(48,813,606 )
Net decrease	(2,098,584 )	(21,083,193 )	(2,367,718 )	(23,720,277 )
Class C
Shares sold	65,861	661,745	176,278	1,758,839
Distributions reinvested	2,187	21,871	1,550	15,472
Shares redeemed	(272,205 )	(2,722,718 )	(134,605 )	(1,349,669 )
Net increase (decrease)	(204,157 )	(2,039,102 )	43,223	424,642
Institutional Class
Shares sold	1,139,480	11,413,888	8,779,942	88,100,889
Distributions reinvested	152,703	1,528,243	158,885	1,590,760
Shares redeemed	(5,624,683 )	(56,455,189 )	(10,229,746 )	(102,553,635 )
Net decrease	(4,332,500 )	(43,513,058 )	(1,290,919 )	(12,861,986 )
Institutional 2 Class
Shares sold	1,807,793	18,109,467	3,513,896	35,210,315
Distributions reinvested	95,659	957,451	167,520	1,674,858
Shares redeemed	(4,297,920 )	(43,059,572 )	(10,211,677 )	(102,561,819 )
Net decrease	(2,394,468 )	(23,992,654 )	(6,530,261 )	(65,676,646 )
Institutional 3 Class
Shares sold	453,631	4,529,862	1,365,780	13,631,656
Distributions reinvested	13,736	137,574	13,572	135,824
Shares redeemed	(6,331,504 )	(63,288,674 )	(18,325,146 )	(183,166,914 )
Net decrease	(5,864,137 )	(58,621,238 )	(16,945,794 )	(169,399,434 )
Total net decrease	(16,256,157 )	(162,897,521 )	(27,909,182 )	(279,514,603 )

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Financial Highlights

	Net asset value, beginning of period	Net investment income (loss)	Net realized and unrealized gain (loss)	Total from investment operations	Distributions from net investment income	Total distributions to shareholders
Class A
Year Ended 4/30/2024	$10.03	0.22	0.00 (c),(d)	0.22	(0.22 )	(0.22 )
Year Ended 4/30/2023	$10.01	0.14	0.03	0.17	(0.15 )	(0.15 )
Year Ended 4/30/2022	$10.46	0.07	(0.45 )	(0.38 )	(0.07 )	(0.07 )
Year Ended 4/30/2021	$10.26	0.11	0.20	0.31	(0.11 )	(0.11 )
Year Ended 4/30/2020	$10.35	0.15	(0.08 )	0.07	(0.16 )	(0.16 )
Advisor Class
Year Ended 4/30/2024	$10.04	0.24	0.01 (c)	0.25	(0.25 )	(0.25 )
Year Ended 4/30/2023	$10.02	0.16	0.03	0.19	(0.17 )	(0.17 )
Year Ended 4/30/2022	$10.48	0.10	(0.47 )	(0.37 )	(0.09 )	(0.09 )
Year Ended 4/30/2021	$10.27	0.13	0.21	0.34	(0.13 )	(0.13 )
Year Ended 4/30/2020	$10.36	0.18	(0.09 )	0.09	(0.18 )	(0.18 )
Institutional Class
Year Ended 4/30/2024	$10.03	0.24	0.01 (c)	0.25	(0.25 )	(0.25 )
Year Ended 4/30/2023	$10.01	0.16	0.03	0.19	(0.17 )	(0.17 )
Year Ended 4/30/2022	$10.46	0.09	(0.45 )	(0.36 )	(0.09 )	(0.09 )
Year Ended 4/30/2021	$10.26	0.13	0.20	0.33	(0.13 )	(0.13 )
Year Ended 4/30/2020	$10.35	0.18	(0.09 )	0.09	(0.18 )	(0.18 )
Institutional 2 Class
Year Ended 4/30/2024	$10.03	0.25	(0.01 )	0.24	(0.25 )	(0.25 )
Year Ended 4/30/2023	$10.01	0.17	0.03	0.20	(0.18 )	(0.18 )
Year Ended 4/30/2022	$10.46	0.09	(0.44 )	(0.35 )	(0.10 )	(0.10 )
Year Ended 4/30/2021	$10.25	0.14	0.21	0.35	(0.14 )	(0.14 )
Year Ended 4/30/2020	$10.35	0.18	(0.09 )	0.09	(0.19 )	(0.19 )

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Financial Highlights (continued)

	Net asset value, end of period	Total return	Total gross expense ratio to average net assets(a)	Total net expense ratio to average net assets(a),(b)	Net investment income (loss) ratio to average net assets	Portfolio turnover	Net assets, end of period (000’s)
Class A
Year Ended 4/30/2024	$10.03	2.23%	0.84% (e)	0.64% (e),(f)	2.18%	22%	$57,298
Year Ended 4/30/2023	$10.03	1.67%	0.83% (e)	0.65% (e),(f)	1.41%	48%	$70,963
Year Ended 4/30/2022	$10.01	(3.68% )	0.81%	0.66% (f)	0.63%	69%	$79,026
Year Ended 4/30/2021	$10.46	2.99%	0.81%	0.66% (f)	1.02%	46%	$72,327
Year Ended 4/30/2020	$10.26	0.63%	0.80% (e)	0.66% (e),(f)	1.48%	58%	$61,987
Advisor Class
Year Ended 4/30/2024	$10.04	2.48%	0.59% (e)	0.39% (e),(f)	2.42%	22%	$32,052
Year Ended 4/30/2023	$10.04	1.92%	0.58% (e)	0.40% (e),(f)	1.65%	48%	$53,125
Year Ended 4/30/2022	$10.02	(3.53% )	0.57%	0.41% (f)	0.93%	69%	$76,764
Year Ended 4/30/2021	$10.48	3.34%	0.56%	0.41% (f)	1.26%	46%	$1,899
Year Ended 4/30/2020	$10.27	0.89%	0.55% (e)	0.41% (e),(f)	1.72%	58%	$1,701
Institutional Class
Year Ended 4/30/2024	$10.03	2.48%	0.59% (e)	0.39% (e),(f)	2.41%	22%	$51,406
Year Ended 4/30/2023	$10.03	1.92%	0.58% (e)	0.40% (e),(f)	1.64%	48%	$94,875
Year Ended 4/30/2022	$10.01	(3.44% )	0.56%	0.41% (f)	0.88%	69%	$107,620
Year Ended 4/30/2021	$10.46	3.25%	0.56%	0.41% (f)	1.27%	46%	$94,743
Year Ended 4/30/2020	$10.26	0.89%	0.55% (e)	0.41% (e),(f)	1.72%	58%	$86,870
Institutional 2 Class
Year Ended 4/30/2024	$10.02	2.43%	0.54% (e)	0.34% (e)	2.48%	22%	$38,464
Year Ended 4/30/2023	$10.03	1.97%	0.52% (e)	0.35% (e)	1.69%	48%	$62,470
Year Ended 4/30/2022	$10.01	(3.40% )	0.51%	0.37%	0.92%	69%	$127,702
Year Ended 4/30/2021	$10.46	3.39%	0.53%	0.37%	1.31%	46%	$86,120
Year Ended 4/30/2020	$10.25	0.83%	0.51% (e)	0.37% (e)	1.77%	58%	$71,372

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Financial Highlights (continued)

	Net asset value, beginning of period	Net investment income (loss)	Net realized and unrealized gain (loss)	Total from investment operations	Distributions from net investment income	Total distributions to shareholders
Institutional 3 Class
Year Ended 4/30/2024	$10.03	0.25	0.01 (c)	0.26	(0.26 )	(0.26 )
Year Ended 4/30/2023	$10.01	0.17	0.03	0.20	(0.18 )	(0.18 )
Year Ended 4/30/2022	$10.46	0.10	(0.45 )	(0.35 )	(0.10 )	(0.10 )
Year Ended 4/30/2021	$10.25	0.14	0.21	0.35	(0.14 )	(0.14 )
Year Ended 4/30/2020	$10.35	0.19	(0.10 )	0.09	(0.19 )	(0.19 )

Notes to Financial Highlights
(a)	In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)	Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)	Calculation of the net gain (loss) per share (both realized and unrealized) does not correlate to the aggregate realized and unrealized gain (loss) presented in the Statement of Operations due to timing of Fund shares sold and redeemed in relation to fluctuations in the market value of the portfolio.
(d)	Rounds to zero.
(e)	Ratios include interfund lending expense which is less than 0.01%.
(f)	The benefits derived from expense reductions had an impact of less than 0.01%.

The accompanying Notes to Financial Statements are an integral part of this statement.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements

April 30, 2024

Note 1. Organization

Columbia Short Duration Municipal Bond Fund (the Fund), a series of Columbia Funds Series Trust (the Trust), is a diversified fund. The Trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Delaware statutory trust.

Fund shares

Note 2. Summary of significant accounting policies

Basis of preparation

The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements.

Security valuation

Investments in open-end investment companies (other than exchange-traded funds (ETFs)), are valued at the latest net asset value reported by those companies as of the valuation time.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Delayed delivery securities

Security transactions

Income recognition

Dividend income is recorded on the ex-dividend date.

Expenses

Determination of class net asset value

Federal income tax status

Distributions to shareholders

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Guarantees and indemnifications

Recent accounting pronouncements and regulatory updates

Tailored Shareholder Reports

Note 3. Fees and other transactions with affiliates

Management services fees

The Fund has entered into a Management Agreement with Columbia Management Investment Advisers, LLC (the Investment Manager), a wholly-owned subsidiary of Ameriprise Financial, Inc. (Ameriprise Financial). Under the Management Agreement, the Investment Manager provides the Fund with investment research and advice, as well as administrative and accounting services. The management services fee is an annual fee that is equal to a percentage of the Fund’s daily net assets that declines from 0.43% to 0.28% as the Fund’s net assets increase. The effective management services fee rate for the year ended April 30, 2024 was 0.43% of the Fund’s average daily net assets.

Compensation of Board members

Compensation of Chief Compliance Officer

Transfer agency fees

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The Transfer Agent also receives compensation from the Fund for various shareholder services and reimbursements for certain out-of-pocket fees. Total transfer agency fees for Institutional 2 Class and Institutional 3 Class shares are subject to an annual limitation of not more than 0.07% and 0.02%, respectively, of the average daily net assets attributable to each share class. In addition, effective through August 31, 2024, Institutional 2 Class shares are subject to a contractual transfer agency fee annual limitation of not more than 0.05% and Institutional 3 Class shares are subject to a contractual transfer agency fee annual limitation of not more than 0.00% of the average daily net assets attributable to each share class.

For the year ended April 30, 2024, the Fund’s effective transfer agency fee rates as a percentage of average daily net assets of each class were as follows:

	Effective rate (%)
Class A	0.09
Advisor Class	0.10
Class C	0.09 (a)
Institutional Class	0.10
Institutional 2 Class	0.04
Institutional 3 Class	0.00

(a)	Unannualized.

Distribution and service fees

Sales charges (unaudited)

	Front End (%)	CDSC (%)	Amount ($)
Class A	1.00	0.50 (a)	33,649
Class C	—	1.00 (b)	203

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

(a)	This charge is imposed on certain investments of $500,000 or more if redeemed within 12 months after purchase.
(b)	This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

The Fund’s other share classes are not subject to sales charges.

Expenses waived/reimbursed by the Investment Manager and its affiliates

	September 1, 2023 through August 31, 2024	Prior to September 1, 2023
Class A	0.65 %	0.65 %
Advisor Class	0.40	0.40
Institutional Class	0.40	0.40
Institutional 2 Class	0.35	0.34
Institutional 3 Class	0.30	0.29

In addition, the Investment Manager and certain of its affiliates have contractually agreed to waive fees and/or reimburse expenses (excluding certain fees and expenses described below) through August 31, 2024, so that the Fund’s net operating expenses, after giving effect to fees waived/expenses reimbursed and any balance credits and/or overdraft charges from the Fund’s custodian, will not exceed the annual rates of 0.66% for Class A, 0.41% for Advisor Class, 0.41% for Institutional Class, 0.37% for Institutional 2 Class and 0.32% for Institutional 3 Class as a percentage of the classes’ average daily net assets. Effective August 31, 2023, this arrangement was terminated and an updated agreement with lower annual expense cap rates as reflected in the table above has been implemented.

Under the agreement governing these fee waivers and/or expense reimbursement arrangements, the following fees and expenses are excluded from the waiver/reimbursement commitment, and therefore will be paid by the Fund, if applicable: taxes (including foreign transaction taxes), expenses associated with investments in affiliated and non-affiliated pooled investment vehicles (including mutual funds and exchange-traded funds), transaction costs and brokerage commissions, costs related to any securities lending program, dividend expenses associated with securities sold short, inverse floater program fees and expenses, transaction charges and interest on borrowed money, interest, costs associated with shareholder meetings, infrequent and/or unusual expenses and any other expenses the exclusion of which is specifically approved by the Board of Trustees. This agreement may be modified or amended only with approval from the Investment Manager, certain of its affiliates and the Fund. In addition to the contractual agreement, the Investment Manager and certain of its affiliates have voluntarily agreed to waive fees and/or reimburse Fund expenses (excluding certain fees and expenses described above) so that Fund level expenses (expenses directly attributable to the Fund and not to a specific share class) are waived proportionately across all share classes. This arrangement may be revised or discontinued at any time. Reflected in the contractual cap commitment, effective through August 31, 2024, is the Transfer Agent’s contractual agreement to limit total transfer agency fees to an annual rate of not more than 0.05% for Institutional 2 Class and 0.00% for Institutional 3 Class of the average daily net assets attributable to each share class, unless sooner terminated at the sole discretion of the Board of Trustees. Any fees waived and/or expenses reimbursed under the expense reimbursement arrangements described above are not recoverable by the Investment Manager or its affiliates in future periods.

Note 4. Federal tax information

At April 30, 2024, these differences were primarily due to differing treatment for capital loss carryforwards, trustees’ deferred compensation and distributions. To the extent these differences were permanent, reclassifications were made among the components of the Fund’s net assets. Temporary differences do not require reclassifications.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The Fund did not have any permanent differences; therefore, no reclassifications were made.

The tax character of distributions paid during the years indicated was as follows:

Year Ended April 30, 2024				Year Ended April 30, 2023
Ordinary income ($)	Tax-exempt income ($)	Long-term capital gains ($)	Total ($)	Ordinary income ($)	Tax-exempt income ($)	Long-term capital gains ($)	Total ($)
34,913	9,958,638	—	9,993,551	36,898	11,076,553	—	11,113,451

Short-term capital gain distributions, if any, are considered ordinary income distributions for tax purposes.

At April 30, 2024, the components of distributable earnings on a tax basis were as follows:

Undistributed ordinary income ($)	Undistributed tax- exempt income ($)	Undistributed long-term capital gains ($)	Capital loss carryforwards ($)	Net unrealized (depreciation) ($)
—	829,832	—	(22,124,646 )	(6,894,159 )

At April 30, 2024, the cost of all investments for federal income tax purposes along with the aggregate gross unrealized appreciation and depreciation based on that cost was:

Federal tax cost ($)	Gross unrealized appreciation ($)	Gross unrealized (depreciation) ($)	Net unrealized (depreciation) ($)
335,624,980	342,404	(7,236,563 )	(6,894,159 )

Tax cost of investments and unrealized appreciation/(depreciation) may also include timing differences that do not constitute adjustments to tax basis.

No expiration short-term ($)	No expiration long-term ($)	Total ($)	Utilized ($)
(8,557,166 )	(13,567,480 )	(22,124,646 )	—

Note 5. Portfolio information

The cost of purchases and proceeds from sales of securities, excluding short-term investments and derivatives, if any, aggregated to $85,354,767 and $231,068,656, respectively, for the year ended April 30, 2024. The amount of purchase and sale activity impacts the portfolio turnover rate reported in the Financial Highlights.

Note 6. Interfund lending

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

The Fund’s activity in the Interfund Program during the year ended April 30, 2024 was as follows:

Borrower or lender	Average loan balance ($)	Weighted average interest rate (%)	Number of days with outstanding loans
Borrower	1,500,000	5.86	2

Interest expense incurred by the Fund is recorded as Interest on interfund lending in the Statement of Operations. The Fund had no outstanding interfund loans at April 30, 2024.

Note 7. Line of credit

The Fund had no borrowings during the year ended April 30, 2024.

Note 8. Significant risks

Credit risk

Interest rate risk

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Liquidity risk

Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may adversely affect the liquidity of the Fund’s investments. The Fund may have to accept a lower selling price for the holding, sell other investments, or forego another, more appealing investment opportunity. Generally, the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. A less liquid market can lead to an increase in Fund redemptions, which may negatively impact Fund performance and net asset value per share, including, for example, if the Fund is forced to sell securities in a down market.

Market risk

Municipal securities risk

Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. A municipal security can be significantly affected by adverse tax, legislative, regulatory, demographic or political changes as well as changes in a particular state’s (state and its instrumentalities’) financial, economic or other condition and prospects.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Notes to Financial Statements (continued)

April 30, 2024

Shareholder concentration risk

At April 30, 2024, one unaffiliated shareholder of record owned 46.3% of the outstanding shares of the Fund in one or more accounts. The Fund has no knowledge about whether any portion of those shares was owned beneficially. Fund shares sold to or redeemed by concentrated accounts may have a significant effect on the operations of the Fund. In the case of a large redemption, the Fund may be forced to sell investments at inopportune times, including its liquid positions, which may result in Fund losses and the Fund holding a higher percentage of less liquid positions. Large redemptions could result in decreased economies of scale and increased operating expenses for non-redeeming Fund shareholders.

Note 9. Subsequent events

Note 10. Information regarding pending and settled legal proceedings

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Columbia Funds Series Trust and Shareholders of Columbia Short Duration Municipal Bond Fund

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities, including the portfolio of investments, of Columbia Short Duration Municipal Bond Fund (one of the funds constituting Columbia Funds Series Trust, referred to hereafter as the "Fund") as of April 30, 2024, the related statement of operations for the year ended April 30, 2024, the statement of changes in net assets for each of the two years in the period ended April 30, 2024, including the related notes, and the financial highlights for each of the five years in the period ended April 30, 2024 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund as of April 30, 2024, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period ended April 30, 2024 and the financial highlights for each of the five years in the period ended April 30, 2024 in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our procedures included confirmation of securities owned as of April 30, 2024 by correspondence with the custodian and broker; when replies were not received from the broker, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

/s/PricewaterhouseCoopers LLP

Minneapolis, Minnesota

June 20, 2024

We have served as the auditor of one or more investment companies within the Columbia Funds Complex since 1977.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Federal Income Tax Information

(Unaudited)

Exempt- interest dividends
99.65%

TRUSTEES AND OFFICERS

(Unaudited)

Independent trustees

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
George S. Batejan c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2017	Executive Vice President, Global Head of Technology and Operations, Janus Capital Group, Inc., 2010-2016	161	Former Chairman of the Board, NICSA (National Investment Company Services Association) (Executive Committee, Nominating Committee and Governance Committee), 2014-2016; former Director, Intech Investment Management, 2011-2016; former Board Member, Metro Denver Chamber of Commerce, 2015-2016; former Advisory Board Member, University of Colorado Business School, 2015-2018; former Board Member, Chase Bank International, 1993-1994

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Kathleen Blatz c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2006	Attorney, specializing in arbitration and mediation; Trustee of Gerald Rauenhorst 1982 Trusts, since 2020; Chief Justice, Minnesota Supreme Court, 1998-2006; Associate Justice, Minnesota Supreme Court, 1996-1998; Fourth Judicial District Court Judge, Hennepin County, 1994-1996; Attorney in private practice and public service, 1984-1993; State Representative, Minnesota House of Representatives, 1979-1993, which included service on the Tax and Financial Institutions and Insurance Committees; Member and Interim Chair, Minnesota Sports Facilities Authority, January-July 2017; Interim President and Chief Executive Officer, Blue Cross and Blue Shield of Minnesota (health care insurance), February-July 2018, April-October 2021	161	Former Trustee, Blue Cross and Blue Shield of Minnesota, 2009-2021 (Chair of the Business Development Committee, 2014-2017; Chair of the Governance Committee, 2017-2019); former Member and Chair of the Board, Minnesota Sports Facilities Authority, January 2017-July 2017; former Director, Robina Foundation, 2009-2020 (Chair, 2014-2020); Director, Richard M. Schulze Family Foundation, since 2021
Pamela G. Carlton c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Chair since 2023; Trustee since 2007	President, Springboard – Partners in Cross Cultural Leadership (consulting company), since 2003; Managing Director of US Equity Research, JP Morgan Chase, 1999-2003; Director of US Equity Research, Chase Asset Management, 1996-1999; Co-Director Latin America Research, 1993-1996, COO Global Research, 1992-1996, Co-Director of US Research, 1991-1992, Investment Banker, 1982-1991, Morgan Stanley; Attorney, Cleary Gottlieb Steen & Hamilton LLP, 1980-1982	161	Trustee, New York Presbyterian Hospital Board, since 1996; Director, DR Bank (Audit Committee, since 2017 and Audit Committee Chair, since November 2023); Director, Evercore Inc. (Audit Committee, Nominating and Governance Committee) (financial services company), since 2019; Director, Apollo Commercial Real Estate Finance, Inc. (Chair, Nominating and Governance Committee), since 2021; the Governing Council of the Independent Directors Council (IDC), since 2021
Janet Langford Carrig c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1957	Trustee since 1996	Senior Vice President, General Counsel and Corporate Secretary, ConocoPhillips (independent energy company), September 2007-October 2018	161	Director, EQT Corporation (natural gas producer), since 2019; former Director, Whiting Petroleum Corporation (independent oil and gas company), 2020-2022
J. Kevin Connaughton c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1964	Trustee since 2020	CEO and President, RhodeWay Financial (non-profit financial planning firm), since December 2022; Member, FINRA National Adjudicatory Council, January 2020-December 2023; Adjunct Professor of Finance, Bentley University January 2018-April 2023; Consultant to Independent Trustees of CFVIT and CFST I from March 2016 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Managing Director and General Manager of Mutual Fund Products, Columbia Management Investment Advisers, LLC, May 2010-February 2015; President, Columbia Funds, 2008-2015; and senior officer of Columbia Funds and affiliated funds, 2003-2015	159	Former Director, The Autism Project, March 2015-December 2021; former Member of the Investment Committee, St. Michael’s College, November 2015-February 2020; former Trustee, St. Michael’s College, June 2017-September 2019; former Trustee, New Century Portfolios (former mutual fund complex), January 2015-December 2017

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Olive M. Darragh c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1962	Trustee since 2020	Managing Director of Darragh Inc. (strategy and talent management consulting firm), since 2010; Founder and CEO, Zolio, Inc. (investment management talent identification platform), since 2004; Consultant to Independent Trustees of CFVIT and CFST I from June 2019 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Partner, Tudor Investments, 2004-2010; Senior Partner, McKinsey & Company (consulting), 1990-2004; Touche Ross CPA, 1985-1988	159	Treasurer, Edinburgh University US Trust Board, since January 2023; Member, HBS Community Action Partners Board, since September 2022; former Director, University of Edinburgh Business School (Member of US Board), 2004-2019; former Director, Boston Public Library Foundation, 2008-2017
Patricia M. Flynn c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1950	Trustee since 2004	Professor Emeritus of Economics and Management, Bentley University, since 2023; Professor of Economics and Management, Bentley University, 1976-2023; Dean, McCallum Graduate School of Business, Bentley University, 1992-2002	161	Former Trustee, MA Taxpayers Foundation, 1997-2022; former Director, The MA Business Roundtable, 2003-2019; former Chairperson, Innovation Index Advisory Committee, MA Technology Collaborative, 1997-2020
Brian J. Gallagher c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1954	Trustee since 2017	Retired; Partner with Deloitte & Touche LLP and its predecessors, 1977-2016	161	Trustee, Catholic Schools Foundation, since 2004
Douglas A. Hacker c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1955	Trustee since 1996	Independent business executive, since May 2006; Executive Vice President – Strategy of United Airlines, December 2002 - May 2006; President of UAL Loyalty Services (airline marketing company), September 2001-December 2002; Executive Vice President and Chief Financial Officer of United Airlines, July 1999-September 2001	161	Director, SpartanNash Company (food distributor), since November 2013 (Chair of the Board, since May 2021); Director, Aircastle Limited (aircraft leasing), since August 2006 (Chair of Audit Committee); former Director, Nash Finch Company (food distributor), 2005-2013; former Director, SeaCube Container Leasing Ltd. (container leasing), 2010-2013; and former Director, Travelport Worldwide Limited (travel information technology), 2014-2019
Nancy T. Lukitsh c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1956	Trustee since 2011	Senior Vice President, Partner and Director of Marketing, Wellington Management Company, LLP (investment adviser), 1997-2010; Chair, Wellington Management Portfolios (commingled non-U.S. investment pools), 2007-2010; Director, Wellington Trust Company, NA and other Wellington affiliates, 1997-2010	159	None

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
David M. Moffett c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1952	Trustee since 2011	Retired; former Chief Executive Officer of Freddie Mac and Chief Financial Officer of U.S. Bank	161	Director, CSX Corporation (transportation suppliers); Director, PayPal Holdings Inc. (payment and data processing services); former Director, eBay Inc. (online trading community), 2007-2015; and former Director, CIT Bank, CIT Group Inc. (commercial and consumer finance), 2010-2016; former Senior Adviser to The Carlyle Group (financial services), March 2008-September 2008; former Governance Consultant to Bridgewater Associates, January 2013-December 2015
Catherine James Paglia c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1952	Trustee since 2004	Director, Enterprise Asset Management, Inc. (private real estate and asset management company), since September 1998; Managing Director and Partner, Interlaken Capital, Inc., 1989-1997; Vice President, 1982-1985, Principal, 1985-1987, Managing Director, 1987-1989, Morgan Stanley; Vice President, Investment Banking, 1980-1982, Associate, Investment Banking, 1976-1980, Dean Witter Reynolds, Inc.	161	Director, Valmont Industries, Inc. (irrigation systems manufacturer), since 2012; Trustee, Carleton College (on the Investment Committee), since 1987; Trustee, Carnegie Endowment for International Peace (on the Investment Committee), since 2009
Natalie A. Trunow c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1967	Trustee since 2020	Chief Executive Officer, Millennial Portfolio Solutions LLC (asset management and consulting services), January 2016-January 2021; Non-executive Member of the Investment Committee and Valuation Committee, Sarona Asset Management Inc. (private equity firm) since September 2019; Advisor, Horizon Investments (asset management and consulting services), August 2018-January 2022; Advisor, Paradigm Asset Management, November 2016-January 2022; Consultant to Independent Trustees of CFVIT and CFST I from September 2016 to June 2020 with respect to CFVIT and to December 2020 with respect to CFST I; Director of Investments/Consultant, Casey Family Programs, April 2016-November 2016; Senior Vice President and Chief Investment Officer, Calvert Investments, August 2008-January 2016; Section Head and Portfolio Manager, General Motors Asset Management, June 1997-August 2008	159	Independent Director, Investment Committee, Health Services for Children with Special Needs, Inc., 2010-2021; Independent Director, (Executive Committee and Chair, Audit Committee), Consumer Credit Counseling Services (formerly Guidewell Financial Solutions), since 2016; Independent Director, (Investment Committee), Sarona Asset Management, since 2019
Sandra L. Yeager c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1964	Trustee since 2017	Retired; President and founder, Hanoverian Capital, LLC (SEC registered investment advisor firm), 2008-2016; Managing Director, DuPont Capital, 2006-2008; Managing Director, Morgan Stanley Investment Management, 2004-2006; Senior Vice President, Alliance Bernstein, 1990-2004	161	Former Director, NAPE (National Alliance for Partnerships in Equity) Education Foundation, October 2016-October 2020; Advisory Board, Jennersville YMCA, June 2022-June 2023

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Independent trustees (continued)

Interested trustee affiliated with Investment Manager**

Name, address, year of birth	Position held with the Columbia Funds and length of service	Principal occupation(s) during the past five years and other relevant professional experience	Number of Funds in the Columbia Funds Complex* overseen	Other directorships held by Trustee during the past five years and other relevant Board experience
Daniel J. Beckman c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, MA 02210 1962	Trustee since November 2021 and President since June 2021	President and Principal Executive Officer of the Columbia Funds, since June 2021; Vice President, Columbia Management Investment Advisers, LLC, since April 2015; formerly, Vice President – Head of North America Product, Columbia Management Investment Advisers, LLC, April 2015 – December 2023; President and Principal Executive Officer, Columbia Acorn/Wanger Funds, since July 2021	161	Director, Ameriprise Trust Company, since October 2016; Director, Columbia Management Investment Distributors, Inc., since November 2018; Board of Governors, Columbia Wanger Asset Management, LLC, since January 2022

Interested person (as defined under the 1940 Act) by reason of being an officer, director, security holder and/or employee of the Investment Manager or Ameriprise Financial.

Fund officers

Name, address and year of birth	Position and year first appointed to position for any Fund in the Columbia Funds Complex or a predecessor thereof	Principal occupation(s) during past five years
Michael G. Clarke 290 Congress Street Boston, MA 02210 1969	Chief Financial Officer and Principal Financial Officer (2009); Senior Vice President (2019); Treasurer and Chief Accounting Officer (Principal Accounting Officer) (2024) for CFST, CFST I, CFST II, CFVIT and CFVST II	Senior Vice President and North America Head of Operations & Investor Services, Columbia Management Investment Advisers, LLC, since June 2023 (previously Senior Vice President and Head of Global Operations, March 2022 – June 2023, Vice President, Head of North America Operations, and Co-Head of Global Operations, June 2019 - February 2022 and Vice President – Accounting and Tax, May 2010 - May 2019); senior officer of Columbia Funds and affiliated funds, since 2002. Director, Ameriprise Trust Company, since June 2023.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

TRUSTEES AND OFFICERS (continued)

(Unaudited)

Fund officers (continued)

Name, address and year of birth	Position and year first appointed to position for any Fund in the Columbia Funds Complex or a predecessor thereof	Principal occupation(s) during past five years
Marybeth Pilat 290 Congress Street Boston, MA 02210 1968	Treasurer and Chief Accounting Officer (Principal Accounting Officer) and Principal Financial Officer (2020) for CET I and CET II; Assistant Treasurer, CFST, CFST I, CFST II, CFVIT and CFVST II	Vice President – Product Pricing and Administration, Columbia Management Investment Advisers, LLC, since May 2017.
William F. Truscott 290 Congress Street Boston, MA 02210 1960	Senior Vice President (2001)	Formerly, Trustee/Director of Columbia Funds Complex or legacy funds, November 2001 - January 1, 2021; Chief Executive Officer, Global Asset Management, Ameriprise Financial, Inc., since September 2012; Chairman of the Board and President, Columbia Management Investment Advisers, LLC, since July 2004 and February 2012, respectively; Chairman of the Board and Chief Executive Officer, Columbia Management Investment Distributors, Inc., since November 2008 and February 2012, respectively; Chairman of the Board and Director, TAM UK International Holdings Limited, since July 2021; formerly Chairman of the Board and Director, Threadneedle Asset Management Holdings, Sàrl, March 2013 – December 2022 and December 2008 – December 2022, respectively; senior executive of various entities affiliated with Columbia Threadneedle Investments.
Christopher O. Petersen 5228 Ameriprise Financial Center Minneapolis, MN 55474 1970	Senior Vice President and Assistant Secretary (2021)	Formerly, Trustee/Director of funds within the Columbia Funds Complex, July 1, 2020 - November 22, 2021; Senior Vice President and Assistant General Counsel, Ameriprise Financial, Inc., since September 2021 (previously Vice President and Lead Chief Counsel, January 2015 - September 2021); formerly, President and Principal Executive Officer of the Columbia Funds, 2015 - 2021; officer of Columbia Funds and affiliated funds, since 2007.
Thomas P. McGuire 290 Congress Street Boston, MA 02210 1972	Senior Vice President and Chief Compliance Officer (2012)	Vice President – Asset Management Compliance, Ameriprise Financial, Inc., since May 2010; Chief Compliance Officer, Columbia Acorn/Wanger Funds, since December 2015; formerly, Chief Compliance Officer, Ameriprise Certificate Company, September 2010 – September 2020.
Ryan C. Larrenaga 290 Congress Street Boston, MA 02210 1970	Senior Vice President (2017), Chief Legal Officer (2017), and Secretary (2015)	Vice President and Chief Counsel, Ameriprise Financial, Inc., since August 2018 (previously Vice President and Group Counsel, August 2011 - August 2018); Chief Legal Officer, Columbia Acorn/Wanger Funds, since September 2020; officer of Columbia Funds and affiliated funds, since 2005.
Michael E. DeFao 290 Congress Street Boston, MA 02210 1968	Vice President (2011) and Assistant Secretary (2010)	Vice President and Chief Counsel, Ameriprise Financial, Inc., since May 2010; Vice President, Chief Legal Officer and Assistant Secretary, Columbia Management Investment Advisers, LLC, since October 2021 (previously Vice President and Assistant Secretary, May 2010 – September 2021).
Lyn Kephart-Strong 5903 Ameriprise Financial Center Minneapolis, MN 55474 1960	Vice President (2015)	Vice President, Global Investment Operations Services, Columbia Management Investment Advisers, LLC, since 2010; President, Columbia Management Investment Services Corp., since October 2014; President, Ameriprise Trust Company, since January 2017.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

Liquidity Risk Management Program

(Unaudited)

•

the Fund had sufficient liquidity to both meet redemptions and operate effectively on behalf of shareholders;

•

there were no material changes to the Program during the period;

•

the implementation of the Program was effective to manage the Fund’s liquidity risk; and

•

the Program operated adequately during the period.

Columbia Short Duration Municipal Bond Fund | Annual Report 2024

The registrant has adopted a code of ethics (the “Code”) that applies to the registrant’s principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. During the period covered by this report, there were not any amendments to a provision of the Code that relates to any element of the code of ethics definition enumerated in paragraph (b) of Item 2 of Form N-CSR. During the period covered by this report, there were no waivers, including any implicit waivers, from a provision of the Code that relates to one or more of the items set forth in paragraph (b) of Item 2 of Form N-CSR. A copy of the Code is attached hereto.

The registrant’s Board of Trustees has determined that David M. Moffett, Brian J. Gallagher, J. Kevin Connaughton, Sandra L. Yeager, and Douglas A. Hacker, each of whom are members of the registrant’s Board of Trustees and Audit Committee, each qualify as an audit committee financial expert. Mr. Moffett, Mr. Gallagher, Mr. Connaughton, Ms. Yeager, and Mr. Hacker are each independent trustees, as defined in paragraph (a)(2) of this item’s instructions.

Fee information below is disclosed for the series of the relevant registrant whose reports to shareholders are included in this annual filing.

(a) Audit Fees. Aggregate Audit Fees billed by the principal accountant for professional services rendered during the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

Audit Fees include amounts related to the audit of the registrant’s annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years.

(b) Audit-Related Fees. Aggregate Audit-Related Fees billed to the registrant by the principal accountant for professional services rendered during the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

Audit-Related Fees, if any, include amounts for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant’s financial statements and are not reported in Audit Fees above.

During the fiscal years ended April 30, 2024 and April 30, 2023, there were no Audit-Related Fees billed by the registrant’s principal accountant to the registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for an engagement that related directly to the operations and financial reporting of the registrant.

(c) Tax Fees. Aggregate Tax Fees billed by the principal accountant to the registrant for professional services rendered during the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

Tax Fees include amounts for the review of annual tax returns, the review of required shareholder distribution calculations and typically include amounts for professional services by the principal accountant for tax compliance, tax advice and tax planning.

During the fiscal years ended April 30, 2024 and April 30, 2023, there were no Tax Fees billed by the registrant’s principal accountant to the registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for an engagement that related directly to the operations and financial reporting of the registrant.

(d) All Other Fees. Aggregate All Other Fees billed by the principal accountant to the registrant for professional services rendered during the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

All Other Fees, if any, include amounts for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) above.

Aggregate All Other Fees billed by the registrant’s principal accountant to the registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for an engagement that related directly to the operations and financial reporting of the registrant during the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

In fiscal years 2024 and 2023, All Other Fees primarily consists of fees billed for internal control examinations of the registrant’s transfer agent and investment adviser.

The registrant’s Audit Committee is required to pre-approve the engagement of the registrant’s independent auditors to provide audit and non-audit services to the registrant and non-audit services to its investment adviser (excluding any sub-adviser whose role is primarily portfolio management and is sub-contracted or overseen by another investment adviser (the “Adviser”) or any entity controlling, controlled by or under common control with the Adviser that provides ongoing services to the Fund (a “Control Affiliate”) if the engagement relates directly to the operations and financial reporting of the registrant.

The Audit Committee has adopted a Policy for Engagement of Independent Auditors for Audit and Non-Audit Services (the “Policy”). The Policy sets forth the understanding of the Audit Committee regarding the engagement of the registrant’s independent accountants to provide (i) audit and permissible audit-related, tax and other services to the registrant (“Fund Services”); (ii) non-audit services to the registrant’s Adviser and any Control Affiliates, that relates directly to the operations and financial reporting of a Fund (“Fund-related Adviser Services”); and (iii) certain other audit and non-audit services to the registrant’s Adviser and its Control Affiliates. A service will require specific pre-approval by the Audit Committee if it is to be provided by the Fund’s independent auditor; provided, however, that pre-approval of non-audit services to the Fund, the Adviser or Control Affiliates may be waived if certain de minimis requirements set forth in the SEC’s rules are met.

Under the Policy, the Audit Committee may delegate pre-approval authority to any pre-designated member or members who are independent board members. The member(s) to whom such authority is delegated must report, for informational purposes only, any pre-approval decisions to the Audit Committee at its next regular meeting. The Audit Committee's responsibilities with respect to the pre-approval of services performed by the independent auditor may not be delegated to management.

On an annual basis, at a regularly scheduled Audit Committee meeting, the Fund’s Treasurer or other Fund officer shall submit to the Audit Committee a schedule of the types of Fund Services and Fund-related Adviser Services that are subject to specific pre-approval. This schedule will provide a description of each type of service that is subject to specific pre-approval, along with total projected fees for each service. The pre-approval will generally cover a one-year period. The Audit Committee will review and approve the types of services and the projected fees for the next one-year period and may add to, or subtract from, the list of pre-approved services from time to time, based on subsequent determinations. This specific approval acknowledges that the Audit Committee is in agreement with the specific types of services that the independent auditor will be permitted to perform and the projected fees for each service.

The Fund’s Treasurer or other Fund officer shall report to the Audit Committee at each of its regular meetings regarding all Fund Services or Fund-related Adviser Services provided since the last such report was rendered, including a description of the services, by category, with forecasted fees for the annual reporting period, proposed changes requiring specific pre-approval and a description of services provided by the independent auditor, by category, with actual fees during the current reporting period.

(e)(2) None, or 0%, of the Audit-Related Fees, Tax Fees and All Other Fees paid by the Fund or affiliated entities relating directly to the operations and financial reporting of the Registrant disclosed above were approved by the audit committee pursuant to paragraphs (c)(7)(i)(C) of Rule 2-01 of Regulation S-X (which permits audit committee approval after the start of the engagement with respect to services other than audit, review or attest services, if certain conditions are satisfied).

(g) The aggregate non-audit fees billed by the registrant’s accountant for services rendered to the registrant, and rendered to the registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for the fiscal years ended April 30, 2024 and April 30, 2023 are approximately as follows:

(h) The registrant’s Audit Committee of the Board of Directors has considered whether the provision of non-audit services that were rendered to the registrant’s adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X, is compatible with maintaining the principal accountant’s independence.

Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

There were no material changes to the procedures by which shareholders may recommend nominees to the registrant's board of directors.

Item 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

	Year Ended April 30, 2024	Year Ended April 30, 2023
Operations
Net investment income	$7,935,314	$8,642,866
Net realized loss	(1,592,738 )	(6,312,604 )
Net change in unrealized appreciation (depreciation)	(752,281 )	7,873,119
Net increase in net assets resulting from operations	5,590,295	10,203,381
Distributions to shareholders
Net investment income and net realized gains
Class A	(873,674 )	(1,020,973 )
Advisor Class	(343,274 )	(187,364 )
Class C	(40,848 )	(61,373 )
Institutional Class	(3,987,695 )	(4,812,440 )
Institutional 2 Class	(254,711 )	(208,125 )
Institutional 3 Class	(2,388,239 )	(2,371,668 )
Total distributions to shareholders	(7,888,441 )	(8,661,943 )
Decrease in net assets from capital stock activity	(33,855,804 )	(100,881,238 )
Total decrease in net assets	(36,153,950 )	(99,339,800 )
Net assets at beginning of year	313,713,179	413,052,979
Net assets at end of year	$277,559,229	$313,713,179

(registrant)	Columbia Funds Series Trust

By (Signature and Title)	/s/ Daniel J. Beckman
	Daniel J. Beckman, President and Principal Executive Officer

Date	June 20, 2024

By (Signature and Title)	/s/ Michael G. Clarke
	Michael G. Clarke, Chief Financial Officer,
	Treasurer, Chief Accounting Officer, Principal Financial Officer and Senior Vice President

Date	June 20, 2024