Thornburg Income Builder Opportunities Trust

Investment Goal and
Trust Overview

The Income Builder Opportunities Trust’s investment objective is to seek current income and additional total return.

Under normal market conditions, the Trust will seek to achieve its investment objective by investing, directly or indirectly, at least 80% of its Managed Assets (as defined below) in a broad range of income-producing securities. The Trust will invest in both equity and debt securities of companies located in the United States and around the globe. The Trust may invest in non-U.S. domiciled companies, including up to 20% of the Trust’s Managed Assets at the time of investment in equity and debt securities of emerging market companies.

“Managed Assets” means the total assets of the Trust, including assets attributable to leverage, minus liabilities (other than debt representing leverage and any preferred stock that may be outstanding).

Performance drivers and detractors for the reporting period ended March 31, 2024

» When reviewing performance, we believe it’s constructive to consider the Trust’s performance in terms of both market price and actual net asset value (NAV). On a price basis, the Trust returned 14.75% for the 6-month period ended March 31, 2024. On an NAV basis, the Trust returned 12.15% versus a return of 17.35% for the blended index consisting of 25% Bloomberg US Aggregate Bond Total Return Index Value USD and 75% MSCI World Net Total Return USD Index (the "Blended Index").

» The Trust’s allocation to the options writing strategy contributed positively to performance relative to the Blended Index during the trailing 6-month period, while the equity and fixed income allocations detracted from performance relative to the Blended Index during the period.

» Within equities, an underweight allocation relative to the Blended Index was a headwind as equities outperformed bonds during the period. Stock selection, driven by investments in healthcare and utilities, also detracted from results relative to the Blended Index. The Trust’s stock selection within U.S. equities outperformed relative to the Blended Index.

» Within the Trust’s fixed income holdings, a shorter duration positioning during the period was a primary driver of its underperformance relative to the Blended Index. Selection effect within asset-backed bonds was a detractor from the Trust’s performance.

Performance Summary

March 31, 2024 (Unaudited)

AVERAGE ANNUAL TOTAL RETURNS

	1-YR	SINCE INCEPTION
Common Shares (Incep: 7/28/21)
At net asset value	13.35%	3.70%
At market price	11.22%	-1.14%

30-DAY YIELDS, COMMON SHARES

Annualized Distribution Yield

6.80%

GROWTH OF A HYPOTHETICAL $10,000 INVESTMENT

FINAL VALUE

The matters discussed in this report may constitute forward-looking statements made pursuant to the safe harbor provisions of the Securities Litigation Reform Act of 1995. These include any advisor or portfolio manager prediction, assessment, analysis or outlook for individual securities, industries, investment styles, market sectors and/or markets. These statements involve risks and uncertainties. In addition to the general risks described in the Trust’s prospectus, other factors bearing on these reports include the accuracy of the advisor’s or portfolio manager’s forecasts and predictions, the appropriateness of the investment strategies designed by the advisor or portfolio manager and the ability of the advisor or portfolio manager to implement their strategies efficiently and successfully. Any one or more of these factors, as well as other risks affecting the securities markets generally, could cause the actual results of the Trust to differ materially as compared to its benchmarks.

The views expressed are subject to change and do not necessarily reflect the views of Thornburg Investment Management, Inc. This information should not be relied upon as a recommendation or investment advice and is not intended to predict the performance of any investment or market.

Performance data shown represents past performance and is no guarantee of future results. Investment return and principal value will fluctuate so shares, when sold, may be worth more or less than their original cost. Current performance may be lower or higher than quoted. For performance current to the Trust’s most recent month end, visit thornburg.com or call 800-847-0200. The performance information does not reflect the deduction of taxes that a shareholder would pay on distributions or the sale of the Trust’s common shares. Returns reflect the reinvestment of dividends and capital gains. Common shares are sold with no sales charge. As disclosed in the Trust’s most recent prospectus, the total annual fund operating expense before fee waiver or expense reimbursement is 1.65%. The Advisor entered into an “Expense Limitation and Reimbursement Agreement” with the Trust for a two-year term beginning on the date of commencement of operations of the Trust through July 28, 2023 (the “Limitation Period”) to limit the amount of Total Annual Expenses borne by the Trust to an amount not to exceed 1.65% per annum of the Trust’s net assets (the “Expense Cap”). The Expense Limitation and Reimbursement Agreement expired July 28, 2023. While the Expense Limitation and Reimbursement Agreement was in effect, to the extent that expenses for a month exceeded the Expense Cap, the Advisor reimbursed the Trust for expenses to the extent necessary to eliminate such excess.

4 | Semi-Annual Report

Fund Summary
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

PORTFOLIO COMPOSITION

KEY PORTFOLIO ATTRIBUTES
GLOBAL EQUITY STATISTICS
Equity Holdings	61
Weighted Average Market Cap	$183.6B
Median Market Cap	$76.9B
P/E Forecast 1-Fiscal Year	11.3x
Price to Cash Flow	6.0x
Active Share vs. MSCI World Index	90.0%
GLOBAL FIXED INCOME STATISTICS
Bond Holdings/Other	120
Weighted Average Coupon	5.1%
Weighted Average Price	$90.0
Average Effective Maturity	7.3 Yrs
Effective Duration	4.7 Yrs

SECURITY CREDIT RATINGS

A bond credit rating assesses the financial ability of a debt issuer to make timely payments of principal and interest. Ratings of AAA (the highest), AA, A, and BBB are investment-grade quality. Ratings of BB, B, CCC, CC, C and D (the lowest) are considered below investment grade, speculative grade, or junk bonds.

Unrated bonds are included in the not rated (NR) category.

OPTION OVERLAY
Type of options	Calls/Puts
% of Portfolio Overwritten	10.2%
Average Call Strike vs. Spot Price	101.1
Average Put Strike vs. Spot Price	105.0
Weighted Average Days to Expiration	20

TOP TEN EQUITY HOLDINGS
Roche Holding AG	3.0%
Enel SpA	2.7%
Orange SA	2.6%
AT&T, Inc.	2.5%
NN Group NV	2.1%
ING Groep NV	1.9%
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR	1.8%
Nintendo Co. Ltd.	1.8%
BHP Group Ltd.	1.8%
Mercedes-Benz Group AG	1.8%

SECTOR EXPOSURE (percent of equity holdings)
Financials	17.4%
Communication Services	17.3%
Information Technology	14.2%
Health Care	10.3%
Energy	10.1%
Materials	10.1%
Consumer Discretionary	8.8%
Utilities	8.3%
Consumer Staples	3.5%

TOP TEN INDUSTRY GROUPS
Materials	8.1%
Energy	7.7%
Telecommunication Services	6.9%
Utilities	6.1%
Pharmaceuticals, Biotechnology & Life Sciences	5.5%
Media & Entertainment	5.4%
Financial Services	4.7%
Banks	4.4%
Food, Beverage & Tobacco	4.2%
Insurance	4.1%

Semi-Annual Report | 5

Schedule of Investments
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
	Common Stock — 60.8%
	Automobiles & Components — 3.1%
	Automobiles — 3.1%
	Mercedes-Benz Group AG	133,563	$ 10,635,610
	Stellantis NV	278,210	7,873,343
			18,508,953
	Banks — 4.1%
	Banks — 4.1%
	ING Groep NV Series N,	692,299	11,387,035
	JPMorgan Chase & Co.	45,600	9,133,680
	Regions Financial Corp.	184,100	3,873,464
			24,394,179
	Consumer Discretionary Distribution & Retail — 1.4%
	Broadline Retail — 1.4%
	Alibaba Group Holding Ltd.	202,000	1,813,042
	JD.com, Inc. Class A	4,361	60,120
^a	MercadoLibre, Inc.	4,300	6,501,428
			8,374,590
	Consumer Durables & Apparel — 0.8%
	Household Durables — 0.8%
	Sony Group Corp. Sponsored ADR	53,225	4,563,511
			4,563,511
	Consumer Services — 0.0%
	Hotels, Restaurants & Leisure — 0.0%
^a,b	Meituan Class B	9,160	113,287
			113,287
	Consumer Staples Distribution & Retail — 0.6%
	Consumer Staples Distribution & Retail — 0.6%
	Tesco plc	878,000	3,286,825
			3,286,825
	Energy — 6.2%
	Oil, Gas & Consumable Fuels — 6.2%
	Enbridge, Inc.	250,870	9,065,805
	Eni SpA	173,600	2,743,400
	Equinor ASA	200,000	5,362,878
	Petroleo Brasileiro SA Sponsored ADR	302,585	4,602,318
	Shell plc	89,700	2,995,603
	TC Energy Corp.	149,675	6,015,508
	TotalEnergies SE	84,500	5,786,104
			36,571,616
	Financial Services — 2.1%
	Capital Markets — 1.8%
	CME Group, Inc.	49,000	10,549,210
	Financial Services — 0.3%
^a,b	Adyen NV	1,025	1,733,928
			12,283,138
	Food, Beverage & Tobacco — 1.6%
	Food Products — 0.2%
	Nestle SA	12,000	1,274,048
	Tobacco — 1.4%
	Altria Group, Inc.	187,900	8,196,198
			9,470,246
	Health Care Equipment & Services — 0.8%
	Health Care Equipment & Supplies — 0.8%
	Medtronic plc	55,600	4,845,540

6 | Semi-Annual Report

See notes to financial statements.

Schedule of Investments, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
			4,845,540
	Insurance — 4.0%
	Insurance — 4.0%
	Assicurazioni Generali SpA	241,687	$ 6,117,054
	Legal & General Group plc	1,643,600	5,277,450
	NN Group NV	264,961	12,240,232
			23,634,736
	Materials — 6.2%
	Chemicals — 3.0%
	Fertiglobe plc	2,294,190	1,749,263
	LyondellBasell Industries NV Class A	82,904	8,479,421
	OCI NV	279,469	7,655,215
	Metals & Mining — 2.3%
	BHP Group Ltd.	370,500	10,688,387
	Glencore plc	475,000	2,609,715
^c	MMC Norilsk Nickel PJSC	30,700	181,130
^a,c	Severstal PAO GDR	236,300	14,178
	Paper & Forest Products — 0.9%
	Mondi plc	290,908	5,123,850
			36,501,159
	Media & Entertainment — 4.0%
	Entertainment — 2.1%
	Nintendo Co. Ltd.	196,000	10,693,381
^a	Sea Ltd. ADR	36,900	1,981,899
	Interactive Media & Services — 1.9%
	Meta Platforms, Inc. Class A	15,200	7,380,816
	Tencent Holdings Ltd.	91,600	3,555,441
			23,611,537
	Pharmaceuticals, Biotechnology & Life Sciences — 5.5%
	Pharmaceuticals — 5.5%
	AstraZeneca plc	21,700	2,924,560
	Novartis AG	24,000	2,325,087
	Pfizer, Inc.	334,611	9,285,455
	Roche Holding AG	69,531	17,709,454
			32,244,556
	Semiconductors & Semiconductor Equipment — 3.0%
	Semiconductors & Semiconductor Equipment — 3.0%
	ASML Holding NV	3,450	3,320,797
	QUALCOMM, Inc.	20,396	3,453,043
	Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR	78,882	10,731,896
			17,505,736
	Software & Services — 1.9%
	Information Technology Services — 0.2%
^a	Shopify, Inc. Class A	17,500	1,350,475
	Software — 1.7%
	Microsoft Corp.	10,700	4,501,704
	Open Text Corp.	42,700	1,656,869
^a	ServiceNow, Inc.	5,000	3,812,000
			11,321,048
	Technology Hardware & Equipment — 3.8%
	Communications Equipment — 2.0%
	Cisco Systems, Inc.	174,100	8,689,331
	Telefonaktiebolaget LM Ericsson Class B	577,800	3,111,397
	Electronic Equipment, Instruments & Components — 1.8%
	Keyence Corp.	11,000	5,093,077
	Lotes Co. Ltd.	125,189	5,417,744
			22,311,549
	Telecommunication Services — 6.6%

See notes to financial statements.

Semi-Annual Report | 7

Schedule of Investments, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
	Diversified Telecommunication Services — 6.1%
	AT&T, Inc.	841,453	$ 14,809,573
	Deutsche Telekom AG	250,837	6,088,848
	Orange SA	1,271,145	14,931,527
	Wireless Telecommunication Services — 0.5%
	Vodafone Group plc	3,450,000	3,068,122
			38,898,070
	Utilities — 5.1%
	Electric Utilities — 4.3%
	Endesa SA	514,135	9,520,988
	Enel SpA	2,405,127	15,877,404
	Independent Power and Renewable Electricity Producers — 0.8%
	Capital Power Corp.	155,920	4,398,289
			29,796,681
	Total Common Stock (Cost $402,179,248)		358,236,957
	Preferred Stock — 0.4%
	Financial Services — 0.4%
	Capital Markets — 0.4%
^c,d	Gabelli Dividend & Income Trust Series J, 4.50%, 3/26/2028	102	2,406,588
			2,406,588
	Total Preferred Stock (Cost $2,358,500)		2,406,588
	Asset Backed Securities — 2.8%
	Auto Receivables — 1.0%
^b	BOF VII AL Funding Trust I, Series 2023-CAR3 Class A2, 6.291% due 7/26/2032	$ 1,453,583	1,461,568
	Carvana Auto Receivables Trust,
^b	Series 2021-P3 Class R, due 9/11/2028	2,500	494,716
^b	Series 2022-P1 Class R, due 1/10/2029	3,000	706,899
^b	Series 2022-P1 Class XS, due 1/10/2029	76,170,629	352,343
^b	Credit Suisse ABS Trust Series 2020-AT1 Class CERT, due 6/15/2026	16,617	117,638
	JPMorgan Chase Bank NA - CACLN,
^b	Series 2020-1 Class R, 33.784% due 1/25/2028	619,022	653,093
^b	Series 2020-2 Class R, 31.355% due 2/25/2028	1,186,587	1,292,213
^b	Lendbuzz Securitization Trust, Series 2022-1A Class A, 4.22% due 5/17/2027	997,285	977,914
^b	United Auto Credit Securitization Trust Series 2022-1 Class R, due 11/10/2028	6,000	75,468
			6,131,852
	Credit Card — 0.3%
^b	Mercury Financial Credit Card Master Trust, Series 2023-1A Class A, 8.04% due 9/20/2027	2,000,000	2,017,169
			2,017,169
	Other Asset Backed — 1.5%
^b	Aqua Finance Trust, Series 2020-AA Class D, 7.15% due 7/17/2046	750,000	661,301
^b	FAT Brands Fazoli’s Native I LLC, Series 2021-1 Class A2, 7.00% due 7/25/2051	2,475,000	2,276,235
^b,c	Goldman Home Improvement Trust Issuer Trust Series 2021-GRN2 Class R, due 6/20/2051	12,500	700,230
^b	LP LMS Asset Securitization Trust, Series 2021-2A Class D, 6.61% due 1/15/2029	1,000,000	876,232
^b	Marlette Funding Trust Series 2021-3A Class R, due 12/15/2031	14,510	556,818
^b	Mosaic Solar Loan Trust Series 2021-3A Class R, due 6/20/2052	8,449,247	348,354
^d	Prosper Marketplace Issuance Trust Series 2019-4A Class CERT, due 2/17/2026	44,850	353,239
	Upstart Pass-Through Trust,
^b	Series 2021-ST5 Class A, 2.00% due 7/20/2027	424,387	409,512
^b	Series 2021-ST7 Class CERT, due 9/20/2029	3,000,000	1,296,432
^b	Series 2021-ST8 Class CERT, due 10/20/2029	3,000,000	825,882
^b	Upstart Structured Pass-Through Trust, Series 2022-4A Class A, 7.01% due 11/15/2030	411,034	411,703
			8,715,938
	Total Asset Backed Securities (Cost $22,275,686)		16,864,959
	Corporate Bonds — 17.7%
	Banks — 0.3%

8 | Semi-Annual Report

See notes to financial statements.

Schedule of Investments, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
	Banks — 0.3%
^d,e	Bank of New York Mellon Corp., Series I, 3.75% (5-Yr. CMT + 2.630%) due 12/20/2026	$ 2,000,000	$ 1,834,560
			1,834,560
	Capital Goods — 0.3%
	Construction & Engineering — 0.3%
^b,f	IHS Netherlands Holdco BV, 8.00% due 9/18/2027	2,000,000	1,908,700
			1,908,700
	Commercial & Professional Services — 0.8%
	Commercial Services & Supplies — 0.8%
^b	ACCO Brands Corp., 4.25% due 3/15/2029	500,000	450,005
^f	Cimpress plc, 7.00% due 6/15/2026	2,000,000	1,999,900
	CoreCivic, Inc., 8.25% due 4/15/2029	1,867,000	1,952,751
			4,402,656
	Consumer Durables & Apparel — 0.5%
	Household Durables — 0.5%
^b	CD&R Smokey Buyer, Inc., 6.75% due 7/15/2025	3,000,000	2,972,070
			2,972,070
	Consumer Services — 0.5%
	Hotels, Restaurants & Leisure — 0.5%
^b	Nathan’s Famous, Inc., 6.625% due 11/1/2025	1,125,000	1,123,189
^b	TKC Holdings, Inc., 6.875% due 5/15/2028	2,000,000	1,897,480
			3,020,669
	Consumer Staples Distribution & Retail — 0.6%
	Consumer Staples Distribution & Retail — 0.6%
^b	Albertsons Cos., Inc./Safeway, Inc./New Albertsons LP/Albertsons LLC, 5.875% due 2/15/2028	1,500,000	1,484,355
^b	KeHE Distributors LLC/KeHE Finance Corp./NextWave Distribution, Inc., 9.00% due 2/15/2029	2,000,000	2,027,000
			3,511,355
	Energy — 1.5%
	Oil, Gas & Consumable Fuels — 1.5%
^b	Chesapeake Energy Corp., 5.50% due 2/1/2026	2,000,000	1,986,600
^b	CITGO Petroleum Corp., 7.00% due 6/15/2025	3,000,000	2,996,880
^f	Petroleos Mexicanos, 6.75% due 9/21/2047	3,000,000	1,997,520
	Sunoco LP/Sunoco Finance Corp., 5.875% due 3/15/2028	2,000,000	1,984,980
			8,965,980
	Equity Real Estate Investment Trusts (REITs) — 0.5%
	Diversified REITs — 0.5%
^b	Iron Mountain Information Management Services, Inc., 5.00% due 7/15/2032	3,000,000	2,738,310
			2,738,310
	Financial Services — 2.2%
	Capital Markets — 0.7%
^b,f	B3 SA - Brasil Bolsa Balcao, 4.125% due 9/20/2031	1,750,000	1,528,415
^b	Blue Owl Technology Finance Corp., 3.75% due 6/17/2026	3,000,000	2,772,600
	Consumer Finance — 0.7%
^b	FirstCash, Inc., 6.875% due 3/1/2032	3,750,000	3,752,550
	Financial Services — 0.8%
^b	Antares Holdings LP, 2.75% due 1/15/2027	2,000,000	1,792,460
^b	United Wholesale Mortgage LLC, 5.50% due 11/15/2025	3,000,000	2,973,150
			12,819,175
	Food, Beverage & Tobacco — 2.6%
	Beverages — 1.1%
^b,f	Bacardi Ltd., 5.15% due 5/15/2038	3,000,000	2,854,920
^b,f	Becle SAB de CV, 2.50% due 10/14/2031	2,500,000	1,993,375
^b,f	Central American Bottling Corp./CBC Bottling Holdco SL/Beliv Holdco SL, 5.25% due 4/27/2029	2,000,000	1,906,480
	Food Products — 0.5%
^b	Post Holdings, Inc., 5.50% due 12/15/2029	3,000,000	2,898,150

See notes to financial statements.

Semi-Annual Report | 9

Schedule of Investments, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
	Tobacco — 1.0%
^b	Vector Group Ltd., 10.50% due 11/1/2026	$ 5,630,000	$ 5,662,372
			15,315,297
	Health Care Equipment & Services — 0.5%
	Health Care Providers & Services — 0.5%
^b	Tenet Healthcare Corp., 6.75% due 5/15/2031	3,000,000	3,056,760
			3,056,760
	Household & Personal Products — 0.9%
	Household Products — 0.5%
	Scotts Miracle-Gro Co.,
	4.375% due 2/1/2032	1,500,000	1,293,780
	4.50% due 10/15/2029	1,500,000	1,357,470
	Personal Care Products — 0.4%
^b	Edgewell Personal Care Co., 4.125% due 4/1/2029	2,548,000	2,338,835
			4,990,085
	Insurance — 0.1%
	Insurance — 0.1%
^f	Enstar Group Ltd., 3.10% due 9/1/2031	1,000,000	830,670
			830,670
	Materials — 1.9%
	Containers & Packaging — 0.9%
^b	Matthews International Corp., Class C, 5.25% due 12/1/2025	3,414,000	3,349,339
^b	Sealed Air Corp., 5.00% due 4/15/2029	1,960,000	1,881,169
	Metals & Mining — 1.0%
^f	AngloGold Ashanti Holdings plc, 6.50% due 4/15/2040	2,000,000	1,969,680
	Cleveland-Cliffs, Inc., 7.00% due 3/15/2027	3,000,000	3,010,800
^b	Stillwater Mining Co., 4.50% due 11/16/2029	1,500,000	1,180,545
			11,391,533
	Media & Entertainment — 1.4%
	Media — 1.4%
	CCO Holdings LLC/CCO Holdings Capital Corp.,
^b	4.25% due 1/15/2034	2,000,000	1,509,440
	4.50% due 5/1/2032	2,000,000	1,606,580
^b	Sirius XM Radio, Inc., 5.50% due 7/1/2029	2,500,000	2,380,300
^b,f	Telenet Finance Luxembourg Notes SARL, 5.50% due 3/1/2028	3,000,000	2,826,300
			8,322,620
	Real Estate Management & Development — 0.3%
	Real Estate Management & Development — 0.3%
^b	Cushman & Wakefield U.S. Borrower LLC, 6.75% due 5/15/2028	2,000,000	1,975,080
			1,975,080
	Semiconductors & Semiconductor Equipment — 0.3%
	Semiconductors & Semiconductor Equipment — 0.3%
^b	Qorvo, Inc., 3.375% due 4/1/2031	2,000,000	1,712,420
			1,712,420
	Software & Services — 1.2%
	Information Technology Services — 0.5%
^b	Science Applications International Corp., 4.875% due 4/1/2028	3,000,000	2,865,000
	Internet Software & Services — 0.3%
^b,f	Prosus NV, 4.027% due 8/3/2050	3,000,000	1,917,240
	Software — 0.4%
^b	MSCI, Inc., 3.875% due 2/15/2031	2,500,000	2,228,350
			7,010,590
	Telecommunication Services — 0.3%
	Wireless Telecommunication Services — 0.3%
^b,f	Vmed O2 U.K. Financing I plc, 4.25% due 1/31/2031	2,000,000	1,694,300
			1,694,300

10 | Semi-Annual Report

See notes to financial statements.

Schedule of Investments, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
	Utilities — 1.0%
	Electric Utilities — 1.0%
^b,f	AES Espana BV, 5.70% due 5/4/2028	$ 2,000,000	$ 1,842,300
^f	Comision Federal de Electricidad, 5.00% due 9/29/2036	3,530,000	3,114,590
^b	Midland Cogeneration Venture LP, 6.00% due 3/15/2025	1,029,236	1,005,337
			5,962,227
	Total Corporate Bonds (Cost $106,287,525)		104,435,057
	Other Government — 0.7%
	Egypt Treasury Bills (EGP), Series 364D, due 3/11/2025	126,975,000	2,119,518
^b,f	Finance Department Government of Sharjah, 4.00% due 7/28/2050	3,500,000	2,299,780
	Total Other Government (Cost $4,309,551)		4,419,298
	U.S. Treasury Securities — 2.4%
	U.S. Treasury Inflation-Indexed Bonds,
	0.125%, 2/15/2051	7,994,768	4,786,439
	0.25%, 2/15/2050	3,598,230	2,274,920
	0.75%, 2/15/2042	4,094,040	3,270,527
	1.50%, 2/15/2053	4,149,480	3,628,129
	Total U.S. Treasury Securities (Cost $13,932,512)		13,960,015
	U.S. Government Agencies — 0.2%
^b,d,e	Farm Credit Bank of Texas, Series 4, 5.70% (5-Yr. CMT + 5.420%), 9/15/2025	1,000,000	981,088
	Total U.S. Government Agencies (Cost $1,032,232)		981,088
	Mortgage Backed — 6.9%
^b,d	Barclays Mortgage Loan Trust, Whole Loan Securities Trust CMO, Series 2022-INV1 Class A3, 4.53% due 2/25/2062	1,705,086	1,586,423
	Citigroup Mortgage Loan Trust, Whole Loan Securities Trust CMO,
^b,d	Series 2021-J3 Class B4, 2.859% due 9/25/2051	350,000	194,591
^b,d	Series 2021-J3 Class B6, 2.859% due 9/25/2051	200,000	67,064
	CSMC Trust, CMBS,
^b,d	Series 2020-522F Class A, 9.179% (TSFR1M + 3.85%) due 9/16/2025	2,000,000	1,136,940
^b,d	Series 2021-BPNY Class A, 9.155% (TSFR1M + 3.83%) due 8/15/2026	2,000,000	1,800,080
	CSMC Trust, Whole Loan Securities Trust CMO,
^b,d	Series 2021-NQM8 Class M1, 3.256% due 10/25/2066	3,000,000	1,977,996
^b,d	Series 2022-NQM5 Class A3, 5.169% due 5/25/2067	1,455,563	1,401,330
	Federal Home Loan Mtg Corp.,
^d	Pool 760027, 4.38% (5-Yr. CMT + 1.380%) due 11/1/2047	309,121	300,363
^d	Pool 841463, 2.154% (2.18% - SOFR30A) due 7/1/2052	3,356,220	2,912,671
	Federal Home Loan Mtg Corp., UMBS Collateral, Pool SD8373, 6.00% due 11/1/2053	3,854,780	3,888,277
	Federal National Mtg Assoc.,
^d	Pool BJ2784, 4.975% (5-Yr. CMT + 1.600%) due 12/1/2047	145,294	143,319
^d	Pool BJ4423, 4.985% (5-Yr. CMT + 1.360%) due 1/1/2048	236,949	232,944
^d	Pool BK4138, 5.475% (5-Yr. CMT + 1.600%) due 4/1/2048	382,449	381,133
^d	Pool BN7152, 5.16% (H15T1Y + 2.16%) due 11/1/2047	365,730	373,864
^d	Pool BN7153, 4.41% (H15T1Y + 2.16%) due 4/1/2048	643,439	668,704
^d	Pool BP0632, 4.445% (H15T1Y + 2.07%) due 7/1/2049	111,451	112,136
^d	Pool CB2214, 1.527% (2.20% - SOFR30A) due 11/1/2051	2,746,541	2,456,199
	Federal National Mtg Assoc., UMBS Collateral, Pool MA5166, 6.00% due 10/1/2053	1,333,754	1,345,345
^b,d	GCAT Trust, Whole Loan Securities Trust CMO, Series 2021-CM2 Class A1, 2.352% due 8/25/2066	866,321	781,750
^b,d	Homeward Opportunities Fund I Trust, Whole Loan Securities Trust CMO, Series 2020-2 Class B3, 5.468% due 5/25/2065	3,000,000	2,772,898
^b,d	Homeward Opportunities Fund Trust, Whole Loan Securities Trust CMO, Series 2022-1 A Class A1, 5.082% due 7/25/2067	1,336,057	1,316,492
^b	Houston Galleria Mall Trust, CMBS, Series 2015-HGLR Class A1A2, 3.087% due 3/5/2037	2,000,000	1,933,941
	JP Morgan Mortgage Trust, Whole Loan Securities Trust CMO,
^b,d	Series 2021-11 Class B5, 3.024% due 1/25/2052	708,205	484,597
^b,d	Series 2021-11 Class B6, 2.589% due 1/25/2052	845,796	368,795
^b,d	Series 2023-3 Class A4B, 5.50% due 10/25/2053	1,752,155	1,731,310
	Mello Mortgage Capital Acceptance, Whole Loan Securities Trust CMO,
^b,d,g	Series 2021-INV2 Class AX1, 0.123% due 8/25/2051	99,948,540	502,311
^b,d,g	Series 2021-INV2 Class AX4, 0.70% due 8/25/2051	6,848,295	274,769
^b,d	Series 2021-INV2 Class B5, 3.323% due 8/25/2051	311,595	216,039
^b,d	Series 2021-INV2 Class B6, 3.217% due 8/25/2051	1,508,420	736,149
^b,d,g	Series 2021-INV3 Class AX1, 0.164% due 10/25/2051	25,878,786	180,569

See notes to financial statements.

Semi-Annual Report | 11

Schedule of Investments, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

	Issuer-Description	SHARES/ PRINCIPAL AMOUNT	VALUE
^b,d,g	Series 2021-INV3 Class AX4, 0.55% due 10/25/2051	$ 2,100,551	$ 57,293
^b,d	Series 2021-INV3 Class B5, 3.214% due 10/25/2051	94,621	66,656
^b,d	Series 2021-INV3 Class B6, 3.078% due 10/25/2051	412,390	206,365
^b,d	MFA Trust, Whole Loan Securities Trust CMO, Series 2022-INV1 Class A3, 4.25% due 4/25/2066	750,000	627,370
	New Residential Mortgage Loan Trust, Whole Loan Securities Trust CMO,
^b,d,g	Series 2021-INV1 Class AX1, 0.75% due 6/25/2051	32,007,827	1,190,141
^b,d	Series 2021-INV1 Class B5, 3.25% due 6/25/2051	361,492	269,397
^b,d	Series 2021-INV1 Class B6, 2.771% due 6/25/2051	647,418	329,836
	Sequoia Mortgage Trust, Whole Loan Securities Trust CMO,
^b,d	Series 2021-9 Class A1, 2.50% due 1/25/2052	2,268,959	1,826,535
^b,d	Series 2023-3 Class A1, 6.00% due 9/25/2053	1,375,984	1,372,160
^b,d	Starwood Mortgage Residential Trust, Whole Loan Securities Trust CMO, Series 2021-6 Class M1, 3.386% due 11/25/2066	1,500,000	901,678
	Wells Fargo Mortgage Backed Securities Trust, Whole Loan Securities Trust CMO,
^b,d,g	Series 2021-INV1 Class AIO2, 0.50% due 8/25/2051	27,479,583	764,996
^b,d	Series 2021-INV1 Class B4, 3.313% due 8/25/2051	499,445	380,778
^b,d	Series 2021-INV1 Class B5, 3.313% due 8/25/2051	394,799	278,294
^b,d	Series 2021-INV1 Class B6, 3.313% due 8/25/2051	304,161	129,194
	Total Mortgage Backed (Cost $41,194,822)		40,679,692
	Short-Term Investments — 5.3%
^h	Thornburg Capital Management Fund	3,129,992	31,299,918
	Total Short-Term Investments (Cost $31,299,918)		31,299,918
	Total Investments — 97.2% (Cost $624,869,994)		$573,283,572
	Other Assets Less Liabilities — 2.8%		16,290,600
	Net Assets — 100.0%		$589,574,172

OUTSTANDING WRITTEN OPTIONS CONTRACTS AT MARCH 31, 2024
CONTRACT DESCRIPTION	CONTRACT PARTY*	CONTRACT AMOUNT	EXERCISE PRICE		EXPIRATION DATE	NOTIONAL AMOUNT		PREMIUMS RECEIVED USD	VALUE USD
WRITTEN CALL OPTIONS – (0.3)%
AUTOMOBILES & COMPONENTS – (0.0)%
Mercedes-Benz Group AG	JPM	36,800	EUR	76.00	4/19/2024	EUR	2,716,208	$ 46,528	$ (20,686)
BANKS – (0.1)%
Regions Financial Corp.	JPM	148,500	USD	20.00	4/19/2024	USD	3,124,440	100,980	(193,174)
ING Groep NV	GST	233,000	EUR	13.00	4/26/2024	EUR	3,552,318	15,170	(413,719)

								116,150	(606,893)
CONSUMER STAPLES DISTRIBUTION & RETAIL – (0.1)%
Tesco plc	JPM	878,000	GBP	2.80	4/19/2024	GBP	2,604,148	69,609	(208,514)
HEALTH CARE EQUIPMENT & SERVICES – (0.0)%
Medtronic plc	BOA	27,300	USD	90.00	4/19/2024	USD	2,379,195	12,285	(9,451)
INSURANCE – (0.0)%
Assicurazioni Generali SpA	JPM	123,459	EUR	22.50	4/19/2024	EUR	2,896,348	54,926	(136,674)
MATERIALS – (0.0)%
LyondellBasell Industries NV	GST	35,800	USD	105.00	4/19/2024	USD	3,661,624	28,640	(22,178)
MEDIA & ENTERTAINMENT – (0.0)%
Nintendo Co. Ltd.	JPM	62,000	JPY	9,000.00	4/12/2024	JPY	512,058,000	47,570	(3,769)
Nintendo Co. Ltd.	GST	65,000	JPY	8,500.00	4/12/2024	JPY	536,835,000	63,258	(30,801)

								110,828	(34,570)
PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES – (0.0)%
Novartis AG	UAG	24,000	CHF	89.00	4/19/2024	CHF	2,096,880	36,100	(13,969)

12 | Semi-Annual Report

See notes to financial statements.

Schedule of Investments, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

OUTSTANDING WRITTEN OPTIONS CONTRACTS AT MARCH 31, 2024
CONTRACT DESCRIPTION	CONTRACT PARTY*	CONTRACT AMOUNT	EXERCISE PRICE		EXPIRATION DATE	NOTIONAL AMOUNT		PREMIUMS RECEIVED USD	VALUE USD
SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT – (0.0)%
QUALCOMM, Inc.	BOA	20,396	USD	177.50	4/5/2024	USD	3,453,043	$ 138,081	$ (5,878)
ASML Holding NV	JPM	3,450	EUR	980.00	4/19/2024	EUR	3,078,090	63,549	(27,216)

								201,630	(33,094)
TECHNOLOGY HARDWARE & EQUIPMENT – (0.1)%
Lotes Co. Ltd.	BOA	82,000	TWD	1,250.00	4/17/2024	TWD	113,570,000	50,634	(383,382)
Lotes Co. Ltd.	BOA	43,189	TWD	1,350.00	4/17/2024	TWD	59,816,765	34,076	(102,892)

								84,710	(486,274)

TOTAL WRITTEN CALL OPTIONS								$ 761,406	$ (1,572,303)

WRITTEN PUT OPTIONS – (0.0)%
CONSUMER STAPLES DISTRIBUTION & RETAIL – (0.0)%
Tesco plc	JPM	825,000	GBP	2.80	4/19/2024	GBP	2,446,950	$ 34,346	$ (21,567)
FOOD, BEVERAGE & TOBACCO – (0.0)%
Nestle SA	UAG	44,800	CHF	93.00	4/19/2024	CHF	4,289,600	71,982	(15,932)
TELECOMMUNICATION SERVICES – (0.0)%
Orange SA	GST	257,000	EUR	10.50	5/31/2024	EUR	2,798,216	67,228	(33,125)
TRANSPORTATION – (0.0)%
Deutsche Post AG	GST	71,200	EUR	38.00	5/3/2024	EUR	2,841,948	52,771	(21,924)
UTILITIES – (0.0)%
E.ON SE	JPM	233,500	EUR	11.80	4/19/2024	EUR	3,008,647	58,678	(2,828)

TOTAL WRITTEN PUT OPTIONS								$ 285,005	$ (95,376)

TOTAL								$ 1,046,411	$ (1,667,679)

*	Counterparties include JPMorgan Chase Bank, N.A. (“JPM”), UBS AG ("UAG"), Bank of America ("BOA") and Goldman Sachs International ("GST").

Footnote Legend
a	Non-income producing.
b	Securities exempt from registration under Rule 144A of the Securities Act of 1933, as amended. These securities are restricted but liquid and may only be resold in the ordinary course of business in transactions exempt from registration, normally to qualified institutional buyers. As of March 31, 2024, the aggregate value of these securities in the Trust’s portfolio was $130,986,316, representing 22.22% of the Trust’s net assets.
c	Security currently fair valued by Thornburg Investment Management, Inc.’s Valuation and Pricing Committee.
d	Variable, floating, step, or fixed to floating rate securities are securities for which interest rate changes are based on changes in a designated base rate or on a predetermined schedule. The rates shown are those in effect on March 31, 2024.
e	Securities are perpetual and, thus, do not have a predetermined maturity date. The date shown, if applicable, reflects the next call date.
f	Yankee bond denominated in U.S. dollars and is issued in the U.S. by foreign banks and corporations.
g	Interest only.
h	Investment in Affiliates.

See notes to financial statements.

Semi-Annual Report | 13

Schedule of Investments, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

Portfolio Abbreviations
To simplify the listings of securities, abbreviations are used per the table below:

ABS	Asset Backed Securities
ADR	American Depositary Receipt
CMBS	Commercial Mortgage-Backed Securities
CMO	Collateralized Mortgage Obligation
CMT	Constant Maturity Rate
EGP	Denominated in Egyptian Pound
GDR	Global Depositary Receipt
H15T1Y	US Treasury Yield Curve Rate T-Note Constant Maturity 1 Year
Mtg	Mortgage

SOFR30A	Secured Overnight Financing Rate 30-Day Average
TSFR1M	Term SOFR 1 Month
UMBS	Uniform Mortgage Backed Securities
CHF	Swiss Franc
EUR	Euro
GBP	Great Britain Pound
JPY	Japanese Yen
TWD	Taiwan Dollar
USD	United States Dollar

COUNTRY EXPOSURE * (percent of net assets)
United States	46.8%
Netherlands	6.2%
Italy	4.2%
Canada	4.1%
France	3.5%
Japan	3.5%
Germany	2.8%
United Kingdom	2.8%
Taiwan	2.7%
Australia	2.6%
Brazil	2.1%
Spain	1.6%
China	1.3%
Mexico	1.2%
Norway	0.9%
Austria	0.9%
United Arab Emirates	0.7%
Sweden	0.5%
Bermuda	0.5%
Belgium	0.5%
Switzerland	0.4%
Egypt	0.4%
Ireland	0.3%
Singapore	0.3%
Nigeria	0.3%
Guatemala	0.3%
Dominican Republic	0.3%
South Africa	0.2%
Russian Federation	0.0%**
Other Assets Less Liabilities	8.1%

*	Holdings are classified by country of risk as determined by MSCI and Bloomberg.
**	Country percentage was less than 0.1%.

14 | Semi-Annual Report

See notes to financial statements.

Statement of Assets and Liabilities
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

ASSETS
Investments at cost
Non-affiliated issuers	$ 593,570,076
Non-controlled affiliated issuers	31,299,918
Investments at value
Non-affiliated issuers	541,983,654
Non-controlled affiliated issuers	31,299,918
Cash	8,649,218
Foreign currency at value ^(a)	129,408
Cash segregated as collateral on written options	5,840,000
Receivable for investments sold	5,530
Dividends receivable	1,218,117
Tax reclaims receivable	837,259
Principal and interest receivable	2,205,439
Prepaid expenses and other assets	43,621
Total Assets	592,212,164
Liabilities
Written options at value ^(b)	1,667,679
Payable to investment advisor and other affiliates	663,173
Accounts payable and accrued expenses	307,140
Total Liabilities	2,637,992
Net Assets	$ 589,574,172
NET ASSETS CONSIST OF
Net capital paid in on shares of beneficial interest	$ 641,637,660
Accumulated loss	(52,063,488)
Net Assets	$ 589,574,172
NET ASSET VALUE
Common Shares:
Net assets applicable to shares outstanding	$ 589,574,172
Shares outstanding	32,081,883
Net asset value and redemption price per share	$ 18.38

(a)	Cost of foreign currency is $129,885.
(b)	Premiums received $1,046,411.

See notes to financial statements.

Semi-Annual Report | 15

Notes to Financial Statements
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

NOTE 1 – ORGANIZATION

Thornburg Income Builder Opportunities Trust (the “Trust") is organized as a Delaware statutory trust and commenced operations on July 28, 2021. The Trust is registered as a diversified, closed-end management investment company under the Investment Company Act of 1940, as amended (the "1940 Act"). The Trust will terminate on or before August 2, 2033 (the "Termination Date"); provided, that if the Board of Trustees of the Trust (the "Trustees") believes that under then-current market conditions it is in the best interests of the Trust to do so, the Trust may extend the Termination Date once for up to one year, and once for an additional six months.The Trust seeks to provide current income and additional total return.

The Trust’s investments subject it to certain risks. As of the date of this report, the principal risks of investing in the Trust include investment and market risk, management risk, equity securities risk, small and mid-cap stock risk, credit risk, interest rate risk, inflation/deflation risk, depositary receipts risk, emerging markets securities risk, below investment grade/high yield securities risk, foreign currency risk, exchange-traded funds and other investments companies risk, illiquid securities risk, loan risk, options risk, market discount risk, closed-end fund risk, and limited term and eligible tender offer risk. Please see the Trust’s prospectus and most recent annual shareholder report for a discussion of those principal risks and other risks associated with an investment in the Trust.

NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of significant accounting policies followed by the Trust in the preparation of its financial statements. The Trust prepares its financial statements in conformity with United States generally accepted accounting principles (“GAAP”), including investment company accounting and reporting guidance in the Financial Accounting Standards Board (the “FASB”) Accounting Standard Codification Topic 946.

Allocation of Income, Gains, Losses and Expenses: Net investment income and any realized and unrealized gains and losses are allocated daily to each outstanding share of the Trust at the beginning of the day (after adjusting for the current capital shares activity of the Trust). Expenses common to the Trust and each series of Thornburg Investment Trust are allocated daily among the funds based upon their relative net asset values or other appropriate allocation methods.

Dividends and Distributions to Shareholders: Dividends and distributions to shareholders, which are determined in accordance with federal income tax regulations and may differ from GAAP, are recorded on the ex-dividend date. Ordinary income dividends, if any, are declared and paid monthly. Capital gain distributions, if any, are declared and paid annually and more often if deemed necessary by Thornburg Investment Management, Inc., the Trust’s investment advisor (the “Advisor”). Dividends and distributions are paid and are reinvested in additional shares of the Trust at net asset value per share at the close of business on the ex-dividend date, or at the shareholder’s option, paid in cash.

Foreign Currency Translation: Portfolio investments and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars based on the exchange rate of such currencies against the U.S. dollar on the date of valuation. Purchases and sales of investments and income items denominated in foreign currencies are translated into U.S. dollars at the exchange rate in effect on the transaction date. When the Trust purchases or sells foreign investments, it will customarily enter into a foreign exchange contract to minimize foreign exchange risk from the trade date to the settlement date of such transactions. The values of such spot contracts are included in receivable for investments sold and payable for investments purchased on the Statement of Assets and Liabilities.

The Trust does not separately report the effect of changes in foreign exchange rates from changes in market prices on investments held. Such changes are included in net unrealized appreciation (depreciation) from investments in the Statement of Operations.

Reported net realized gains and losses from foreign currency transactions arise due to purchases and sales of foreign currencies, currency gains and losses realized between the trade and settlement dates on investment transactions and the difference between the amounts of dividends, interest, and foreign withholding taxes recorded on the Trust’s books, and the U.S. dollar equivalent of the amounts actually received or paid. These amounts are included in foreign currency transactions in the Statement of Operations.

Net change in unrealized appreciation (depreciation) on foreign currency translations arise from changes in the fair value of assets and liabilities, other than investments at period end, resulting from changes in exchange rates.

Guarantees and Indemnifications: Under the Trust’s organizational documents (and under separate agreements with the independent Trustees), its officers and Trustees are provided with an indemnification against certain liabilities arising out of the performance of their duties to the Trust. In the normal course of business the Trust may also enter into contracts with service providers that contain general indemnifications. The Trust’s maximum exposure under these arrangements is unknown. However, based on experience, the Trust expects the risk of loss to be remote.

18 | Semi-Annual Report

Notes to Financial Statements, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

Investment Income: Dividend income is recorded on the ex-dividend date. Certain income from foreign investments is recognized as soon as information is available to the Trust. Interest income is accrued as earned. Premiums and discounts are amortized and accreted, respectively, to first call dates or maturity dates using the effective yield method of the respective investments. These amounts are included in Investment Income in the Statement of Operations.

Investment Transactions: Investment transactions are accounted for on a trade date basis. Realized gains and losses from the sale of investments are recorded on an identified cost basis.

Repurchase Agreements: The Trust may invest excess cash in repurchase agreements whereby the Trust purchases investments, which serve as collateral, with an agreement to resell such collateral to the seller at an agreed upon price at the maturity date of the repurchase agreement. Investments pledged as collateral for repurchase agreements are held in custody until maturity of the repurchase agreement. Provisions in the agreements require that the market value of the collateral is at least equal to the repurchase value in the event of default. In the event of default, the Trust has the right to liquidate the collateral and apply the proceeds in satisfaction of the obligation. Under certain circumstances, in the event of default or bankruptcy by the other party to the agreement, realization and/or retention of the collateral may be subject to legal proceedings. During the six months ended March 31, 2024, the Trust did not enter into repurchase agreements.

Security Valuation: All investments in securities held by the Trust are valued as described in Note 3.

Use of Estimates: The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases (decreases) in net assets from operations during the reporting period. Actual results could differ from those estimates.

When-Issued and Delayed Delivery Transactions: The Trust may engage in when-issued or delayed delivery transactions. To the extent the Trust engages in such transactions, it will do so for the purpose of acquiring portfolio investments consistent with the Trust’s investment objectives and not for the purpose of investment leverage or to speculate on interest rate or market changes. At the time the Trust makes a commitment to purchase an investment on a when-issued or delayed delivery basis, the Trust will record the transaction and reflect the value in determining its net asset value. Pursuant to current U.S. Securities and Exchange Commission (“SEC”) guidance, a transaction involving a when-issued security will not be deemed to involve a senior security as long as the Trust intends to settle the transaction physically and the transaction settles within 35 days. Investments purchased on a when-issued or delayed delivery basis do not earn interest until the settlement date. The values of these securities held at March 31, 2024 are detailed in the Schedule of Investments.

NOTE 3 – SECURITY VALUATION

Valuation of the Trust’s portfolio investment securities is performed by the Advisor, which has been designated by the Trustees as the Trust’s “valuation designee,” as that term is defined in rule 2a-5 under the 1940 Act. The Advisor performs this valuation function under the supervision of the Trustees and in accordance with policies and procedures that have been adopted by the Advisor and approved by the Trustees (the “Valuation Policy and Procedures”).

In its capacity as the Trust’s valuation designee, the Advisor makes good faith determinations of the fair value of portfolio securities for which market quotations are not readily available, and otherwise complies with and administers the Valuation Policy and Procedures. The Advisor performs those functions in significant measure through its Valuation and Pricing Committee (the “Committee”), though the Advisor may also obtain the assistance of others, including professional pricing service providers selected and approved by the Committee. In accordance with the Valuation Policy and Procedures, the Committee: assesses and manages the material risks associated with determining the fair value of those Trust investments for which market quotations are not readily available; selects and applies methodologies for determining and calculating such fair values; periodically reviews and tests the appropriateness and accuracy of those methodologies; monitors for circumstances that may necessitate the use of fair value; and approves, monitors, and evaluates pricing services engaged to provide evaluated prices for the Trust’s investments. The Committee provides reports on its activities to the Trustees’ Audit Committee, which is responsible for overseeing the Committee’s and the Advisor’s work in discharging the functions under the Valuation Policy and Procedures.

In those instances when the Committee assists in calculating a fair value for a portfolio investment, the Committee seeks to determine the price that the Trust would reasonably expect to receive upon a sale of the investment in an orderly transaction between market participants on the valuation date. The Committee customarily utilizes quotations from securities broker dealers in calculation valuations, but also may utilize prices obtained from pricing service providers or other methods selected by the Committee. Because fair values calculated by the Committee are estimates, the calculation of a fair value for an investment may differ from the price that would be realized by the Trust upon a sale of the investment, and the difference could be material to the Trust’s financial statements. The Committee’s calculation of a fair value for an investment may also differ from the prices obtained by other persons (including other regulated investment companies) for the investment.

Semi-Annual Report | 19

Notes to Financial Statements, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

Valuation of Securities: Securities and other portfolio investments which are listed or traded on a United States securities exchange are generally valued at the last reported sale price on the valuation date or, if there has been no sale of the investment on that date, at the mean between the last reported bid and asked prices for the investment on that date. Portfolio investments reported by NASDAQ are valued at the official closing price on the valuation date. If an investment is traded on more than one exchange, the investment is considered traded on the exchange that is normally the primary market for that investment. For securities and other portfolio investments which are primarily listed or traded on an exchange outside the United States, the time for determining the investment’s value in accordance with the first sentence of this paragraph will be the close of that investment’s primary exchange preceding the Trust’s valuation time.

In any case when a market quotation is not readily available for a portfolio investment ordinarily valued by market quotation, the Committee calculates a fair value for the investment using methodologies selected and approved by the Committee as described in the Valuation Policy and Procedures, subject to changes or additions by the Committee. For this purpose, a market quotation is considered to be readily available if it is a quoted price (unadjusted) in active markets for identical investments that the Trust can access at the measurement date. Pursuant to the Valuation Policy and Procedures, the Committee shall monitor for circumstances that may necessitate the use of fair valuation methodologies, including circumstances in which a market quotation for an investment is no longer reliable or is otherwise not readily available. For that purpose, a market quotation is not readily available when the primary market or exchange for the applicable investment is not open for the entire scheduled day of trading. A market quotation may also not be readily available if: (a) developments occurring after the most recent close of the applicable investment’s primary exchange, but prior to the close of business on any business day; or (b) an unusual event or significant period of time occurring since the availability of the market quotation, create a serious question concerning the reliability of that market quotation. Additionally, a market quotation will be considered unreliable if it would require adjustment under GAAP, or where GAAP would require consideration of additional inputs in determining the value of the investment. The Committee customarily obtains valuations in those instances from pricing service providers approved by the Committee. Such pricing service providers ordinarily calculate valuations using multi-factor models to adjust market prices based upon various inputs, including exchange data, depository receipt prices, futures, index data, and other data.

Investments in U.S. closed-end funds are valued at the exchange-traded price if they are listed.

Debt obligations held by the Trust which are not listed or traded on exchanges or for which no reported market exists are ordinarily valued at the valuation obtained from a pricing service provider approved by the Committee.

Over-the-counter options are valued by a third-party pricing service provider.

In any case when a pricing service provider fails to provide a valuation for a debt obligation held by the Trust, the Committee may calculate a fair value for the obligation using alternative methods selected and approved by the Committee. Additionally, in cases when the Committee believes that a valuation obtained from a pricing service provider is stale, does not reflect material factors affecting the valuation of the investment, is significantly different than the value the Trust is likely to obtain if they sought a bid for the investment, or is otherwise unreliable, the Committee may calculate a fair value for the obligation using an alternative method selected and approved by the Committee.

If the market quotation for an investment is expressed in a foreign currency, that market quotation will be converted to U.S. dollars using a foreign exchange quotation from a third-party service at the time of valuation. Foreign investments held by the Trust may be traded on days and at times when the Trust is not open for business. Consequently, the value of Trust’s investments may be significantly affected on days when shareholders cannot purchase or sell Trust’s shares.

Valuation Hierarchy: The Trust categorizes its investments based upon the inputs used in valuing those investments, according to a three-level hierarchy established in guidance from the FASB. Categorization of investments using this hierarchy is intended by the FASB to maximize the use of observable inputs in valuing investments and minimize the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are those that market participants would use in valuing an investment based on available market information. Unobservable inputs are those that reflect assumptions about the information market participants would use in valuing an investment. An investment’s level within the hierarchy is based on the lowest level input that is deemed significant to the valuation. The methodologies and inputs used to value investments are not necessarily indications of the risk or liquidity associated with those investments.

Various inputs are used in calculating valuations for the Trust’s investments. These inputs are generally summarized according to the three-level hierarchy below:

Level 1: Quoted prices in active markets for identical investments.

Level 2: Other direct or indirect significant observable inputs (including quoted prices for similar investments in active markets and other observable inputs, such as interest rates, prepayment rates, credit ratings, etc.).

20 | Semi-Annual Report

Notes to Financial Statements, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

Level 3: Significant unobservable inputs (including the Committee’s own assumptions in calculating the fair values of investments).

Valuations for debt obligations held by the Trust are typically calculated by pricing service providers approved by the Committee and are generally characterized as Level 2 within the valuation hierarchy.

On days when market volatility thresholds established by the Committee are exceeded, foreign securities for which valuations are obtained from pricing service providers are fair valued. On these days, the foreign securities are characterized as Level 2 within the valuation hierarchy and revert to Level 1 after the threshold is no longer exceeded.

In any case when a pricing service provider fails to provide a valuation for a debt obligation held by the Trust, the Committee calculates a fair value for the obligation using alternative methods under procedures approved by the Committee. Additionally, in cases when management believes that a valuation obtained from a pricing service provider is stale, does not reflect material factors affecting the valuation of the investment, is significantly different than the value the Trust is likely to obtain if it sought a bid for the investment, or is otherwise unreliable, the Committee calculates a fair value for the obligation using an alternative method approved by the Committee.

In a limited number of cases the Committee calculates a fair value for investments using broker quotations or other methods approved by the Committee. When the Committee uses a single broker quotation to calculate a fair value for an investment without other significant observable inputs, or if a fair value is calculated using other significant inputs that are considered unobservable, the investment is characterized as Level 3 within the hierarchy. Other significant unobservable inputs used to calculate a fair value in these instances might include an income-based valuation approach which considers discounted anticipated future cash flows from the investment and application of discounts due to the nature or duration of any restrictions on the disposition of the investment.

Valuations based upon the use of inputs from Levels 1, 2 or 3 may not represent the actual price received upon the disposition of an investment, and the Trust may receive a price that is lower than the valuation based upon these inputs when it sells the investment.

The following table displays a summary of the fair value hierarchy measurements of the Trust’s investments as of March 31, 2024:

	TOTAL	LEVEL 1	LEVEL 2	LEVEL 3
Assets
Investments in Securities
Common Stock	$ 358,236,957	$ 358,041,649	$ —	$ 195,308
Preferred Stock	2,406,588	—	—	2,406,588
Asset Backed Securities	16,864,959	—	16,164,729	700,230
Corporate Bonds	104,435,057	—	104,435,057	—
Other Government	4,419,298	—	4,419,298	—
U.S. Treasury Securities	13,960,015	13,960,015	—	—
U.S. Government Agencies	981,088	—	981,088	—
Mortgage Backed	40,679,692	—	40,679,692	—
Short-Term Investments	31,299,918	31,299,918	—	—
Total Investments in Securities	$ 573,283,572	$ 403,301,582	$ 166,679,864	$ 3,302,126
Total Assets	$ 573,283,572	$ 403,301,582	$ 166,679,864	$ 3,302,126^(a)
Liabilities
Other Financial Instruments
Written Call Options	$ (1,572,303)	$ —	$ (1,572,303)	$ —
Written Put Options	(95,376)	—	(95,376)	—
Total Other Financial Instruments	$ (1,667,679)	$ —	$ (1,667,679)	$ —
Total Liabilities	$ (1,667,679)	$ —	$ (1,667,679)	$—

^(a)	Level 3 investments at the beginning and/or end of the period in relation to net assets were not significant and accordingly, a reconciliation of Level 3 assets for the period ended March 31, 2024 is not presented.

NOTE 4 – INVESTMENT MANAGEMENT FEE AND OTHER TRANSACTIONS WITH AFFILIATES

Pursuant to an investment advisory agreement with the Trust, the Advisor serves as the investment advisor and performs services for the Trust for which the fees are payable at the end of each month. Under the investment advisory agreement, The Trust pays the Advisor a management fee based on the average daily Managed Assets of the Trust at an annual rate of 1.25%. “Managed Assets” are the total assets of the Trust, including assets attributable to leverage, minus liabilities (other than debt representing leverage and any preferred stock that may be outstanding).

Semi-Annual Report | 21

Notes to Financial Statements, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

The Trust’s effective management fee for the six months ended March 31, 2024 was 1.25% of the Trust’s average daily Managed Assets. Total management fees incurred by the Trust for the six months ended March 31, 2024 are set forth in the Statement of Operations.

The Trust has entered into an administrative services agreement with the Advisor, whereby the Advisor will perform certain administrative services related to the Trust’s common shares. The Trust pays the Advisor for the services it provides as administrator its pro rata portion of a fee computed as an annual percentage of the aggregate of the average daily Managed Assets of the Trust and the average daily net assets of each series of Thornburg Investment Trust at the rates set forth in the table below:

Administrative Services Fee Schedule
Daily Net Assets	Fee Rate
Up to $20 billion	0.100%
$20 billion to $40 billion	0.075
$40 billion to $60 billion	0.040
Over $60 billion	0.030

In May 2021, the Trust retained XA Investments LLC (“XAI”) to provide investor support and secondary market support services in connection with the ongoing operation of the Trust. Pursuant to the investor support services and secondary market support services agreement with XAI, the Trust paid XAI a service fee, payable monthly in arrears, in an annual amount equal to 0.20% of the Trust’s average daily Managed Assets. The agreement with XAI was terminated effective January 16, 2023.

The Advisor entered into an “Expense Limitation and Reimbursement Agreement” with the Trust for a two-year term beginning on the date of commencement of operations of the Trust through July 28, 2023 (the “Limitation Period”) to limit the amount of Total Annual Expenses, excluding certain expenses listed below, borne by the Trust to an amount not to exceed 1.65% per annum of the Trust’s net assets (the “Expense Cap”). The Expense Limitation and Reimbursement Agreement expired July 28, 2023. While the Expense Limitation and Reimbursement Agreement was in effect, to the extent that expenses for a month exceeded the Expense Cap, the Advisor reimbursed the Trust for expenses to the extent necessary to eliminate such excess.

Certain officers and Trustees of the Trust are also officers or directors of the Advisor. The compensation of the independent Trustees is borne by the Trust. The Trust pays no salaries or compensation to any of its interested Trustees or its officers. For their services, the independent Trustees of the Trust receive an annual retainer in the amount of $50,000. In addition, the lead Independent Trustee receives $8,000 annually, the Chair of the Audit Committee receives $6,000 annually and the Chair of the Nominating and Corporate Governance Committee receives $6,000 annually. The independent Trustees are also reimbursed for all reasonable out-of-pocket expenses relating to attendance at meetings of the Board. The Trust also pays a portion of the Chief Compliance Officer’s compensation. These amounts are reflected as Trustee and officer fees in the Statement of Operations.

For the six months ended March 31, 2024, the percentage of direct investments in the Trust held by the Trustees and officers of the Trust is 2.73%.

The Trust may purchase or sell securities from or to an affiliated fund, provided the affiliation is due solely to having a common investment advisor, common officers, or common trustees, and provided that all such transactions will comply with Rule 17a-7 under the 1940 Act. For the six months ended at March 31, 2024, the Trust had no such transactions with affiliated funds.

Shown below are holdings of voting securities of each portfolio company which is considered "affiliated" to the Trust under the 1940 Act, including companies for which the Trust’s holding represented 5% or more of the company’s voting securities, and a series of the Thornburg Investment Trust in which the Trust invested for cash management purposes during the period:

	Market Value 9/30/23	Purchases at Cost	Sales Proceeds	Realized Gain (Loss)	Change in Unrealized Appr./(Depr.)	Market Value 3/31/24	Dividend Income
Thornburg Capital Mgmt. Fund	$32,557,057	$113,485,329	$(114,742,468)	$-	$-	$31,299,918	$1,274,409

NOTE 5 – TAXES

Federal Income Taxes: It is the policy of the Trust to comply with the provisions of the Internal Revenue Code of 1986 applicable to regulated investment companies and to distribute to shareholders substantially all investment company taxable income including net realized gains on investments (if any), and tax exempt income of the Trust. Therefore, no provision for federal income or excise tax is required.

22 | Semi-Annual Report

Notes to Financial Statements, Continued

Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

The Trust files income tax returns in United States federal and applicable state jurisdictions. The statute of limitations on the Trust’s tax return filings generally remains open for the three years following a return’s filing date. The Trust has analyzed each uncertain tax position believed to be material in the preparation of the Trust’s financial statements for the six month period ended March 31, 2024, including open tax years, to assess whether it is more likely than not that the position would be sustained upon examination, based on the technical merits of the position. The Trust has not identified any such position for which an asset or liability must be reflected in the Statements of Assets and Liabilities.

At March 31, 2024, information on the tax components of capital was as follows:

Cost of investments for tax purposes	$ 624,869,994
Gross unrealized appreciation on a tax basis	20,467,876
Gross unrealized depreciation on a tax basis	(72,054,298)
Net unrealized appreciation (depreciation) on investments (tax basis)	$ (51,586,422)

Foreign Withholding Taxes: The Trust is subject to foreign tax withholding imposed by certain foreign countries in which the Trust may invest. Withholding taxes are incurred on certain foreign dividends and are accrued at the time the dividend is recognized based on applicable foreign tax laws. The Trust may file withholding tax reclaims in certain jurisdictions to recover a portion of amounts previously withheld, in view of various considerations, including recent decisions rendered by the courts in those and other jurisdictions. The Trust would expect to record a receivable for such a reclaim based on a variety of factors, including assessment of a jurisdiction’s legal obligation to pay reclaims, the jurisdiction’s administrative practices and payment history, and industry convention. To date the Trust has recorded no such receivable because there is limited precedent for collecting such prior year reclaims in countries other than Finland, and the likelihood of collection in those other countries remains uncertain.

Deferred Foreign Capital Gain Taxes: The Trust is subject to a tax imposed on net realized gains of securities of certain foreign countries. The Trust records an estimated deferred tax liability for net unrealized gains on these investments as reflected in the accompanying financial statements. Such changes are included in net unrealized appreciation (depreciation) from investments in the Statement of Operations.

NOTE 6 – SHARES OF BENEFICIAL INTEREST

At March 31, 2024, there were 32,081,883 shares of the Trust with $0.001 par value of beneficial interest authorized. There were no transactions in the Trust’s shares of beneficial interest during the reporting period. Additional shares of the Trust may be issued under certain circumstances, including pursuant to the Trust’s Dividend Reinvestment Plan. Additional information concerning the Dividend Reinvestment Plan is included within this report.

NOTE 7 – INVESTMENT TRANSACTIONS

For the six months ended March 31, 2024, the Trust had purchase and sale transactions of investments of $143,516,463 and $158,254,167, respectively (excluding short-term investments and U.S. Government obligations).

NOTE 8 – DERIVATIVE FINANCIAL INSTRUMENTS

The Trust may use a variety of derivative financial instruments to hedge or adjust the risks affecting its investment portfolio or to enhance investment returns. Provisions of the FASB Accounting Standards Codification 815-10-50 (“ASC 815”) require certain disclosures. The disclosures are intended to provide users of financial statements with an understanding of the use of derivative instruments by the Trust and how these derivatives affect the financial position, financial performance and cash flows of the Trust. The Trust does not designate any derivative instruments as hedging instruments under ASC 815. During the six months ended March 31, 2024, the Trust’s principal exposure to derivative financial instruments of the type addressed by ASC 815 was investment in options.

As of August 19, 2022, the Trust is subject to Rule18f-4 under the 1940 Act. Rule 18f-4 imposes limits on the amount of derivatives and other transactions a fund can enter into, eliminates the asset segregation framework that had been used by funds to comply with Section 18 of the 1940 Act, and requires funds whose use of derivatives is more than a limited specified exposure to establish and maintain a comprehensive derivatives risk management program and appoint a derivatives risk manager. The Trust intends to operate as a “limited derivatives user” for purposes of the derivatives transactions exemption in Rule 18f-4. To qualify as a limited derivatives user, the Trust’s “derivatives exposure” is limited to 10% of its net assets subject to exclusions for certain currency or interest rate hedging transactions (as calculated in accordance with Rule 18f-4). The Trust has adopted procedures in accordance with Rule 18f-4.

Semi-Annual Report | 23

Notes to Financial Statements, Continued
Thornburg Income Builder Opportunities Trust^|March 31, 2024 (Unaudited)

Option Contracts: The Trust may engage in option transactions and in doing so achieves similar objectives to what it would achieve through the sale or purchase of individual securities. A call option, upon payment of a premium, gives the purchaser of the option the right to buy, and the seller of the option the obligation to sell, the underlying security, index or other instrument at the exercise price.

A put option gives the purchaser of the option, upon payment of a premium, the right to sell, and the seller the obligation to buy, the underlying security, index, or other instrument at the exercise price. To seek to offset some of the risk of a potential decline in value of certain long positions, the Trust may also purchase put options on individual securities, broad-based securities indexes or certain exchange-traded funds (“ETFs”). The Trust may also seek to generate income from option premiums by writing (selling) options on a portion of the equity securities (including securities that are convertible into equity securities) in the Trust’s portfolio, on broad-based securities indexes, or certain ETFs.

When the Trust purchases an option, it pays a premium and an amount equal to that premium is recorded as an asset. When the Trust writes an option, it receives a premium and an amount equal to that premium is recorded as a liability. The asset or liability is adjusted daily to reflect the current market value of the option. If an option expires unexercised, the Trust realizes a gain or loss to the extent of the premium received or paid. If an option is exercised, the premium received or paid is recorded as an adjustment to the proceeds from the sale or the cost basis of the purchase. The difference between the premium and the amount received or paid on a closing purchase or sale transaction is also treated as a realized gain or loss. The cost of securities acquired through the exercise of call options is increased by premiums paid. The proceeds from securities sold through the exercise of put options are decreased by the premiums paid. Gain or loss on written options and purchased options is presented separately on the Statements of Operations as net realized gain or loss on written options and net realized gain or loss on purchased options, respectively.

Options written by the Trust do not typically give rise to counterparty credit risk since options written obligate the Trust and not the counterparty to perform. Exchange-traded purchased options have minimal counterparty credit risk to the Trust since the exchange’s clearinghouse, as counterparty to such instruments, guarantees against a possible default.

As of March 31, 2024, the Trust had no outstanding purchased options. The monthly average notional value of options written contracts for the six months ended March 31, 2024 was $54,050,695.

The value of the outstanding Written Options recognized in the Trust’s Statement of Assets and Liabilities at March 31, 2024 is disclosed in the following table:

Type of Derivative^(a)	Principal Risk	Counter Party	Asset Derivatives	Liability Derivatives	Net Amount
Written Options	Options risk	GST	$ —	$ (521,746)	$ (521,746)
Written Options	Options risk	UAG	—	(29,901)	(29,901)
Written Options	Options risk	JPM	—	(614,429)	(614,429)
Written Options	Options risk	BOA	—	(501,603)	(501,603)

(a)	Generally, the Statement of Assets and Liabilities location for written options is Liabilities - written options at value for liabilities derivatives.

The net realized gain (loss) from written options and net change in unrealized appreciation (depreciation) on outstanding written options recognized in the Trust’s Statement of Operations for the six months ended March 31, 2024 are disclosed in the following table:

		Net Realized	Net Change in Unrealized
Type of Derivative^(a)	Principal Risk	Gain (Loss)	Appreciation (Depreciation)
Written Options	Options risk	$3,752,968	$ (700,967)

(a)	Generally, the Statement of Operations location for written option contracts is Net realized gain (loss) on: options written and Net change in unrealized appreciation (depreciation) on: options written.

The following table presents the Trust’s derivative liabilities by counterparty net of the related collateral segregated by the Trust as of March 31, 2024:

Type of Derivative	Counterparty	Liability Derivatives	Cash Collateral Pledged	Net Amount
Written Options	GST	$ 521,746	$ (521,746)	$ –
Written Options	UAG	29,901	(29,901)	–
Written Options	JPM	614,429	(614,429)	–
Written Options	BOA	501,603	(501,603)	–

24 | Semi-Annual Report

Financial Highlights
Income Builder Opportunities Trust

	2024 ^(a)	2023	2022	2021 ^(b)
Per Share Performance (For a Share Outstanding throughout the Period)^(c)
Net Asset Value, Beginning of Period	$16.98	$14.97	$19.74	$20.00
Net Investment Income (Loss)	0.26	0.59	0.57	0.10
Net Realized & Unrealized Gain (Loss) on Investments	1.77	2.67	(4.09)	(0.26)
Total from Investment Operations	2.03	3.26	(3.52)	(0.16)
Dividends from Net Investment Income	(0.63)	(1.14)	(1.25)	(0.10)
Dividends from Net Realized Gains	0.00	(0.11)	0.00	0.00
Total Dividends	(0.63)	(1.25)	(1.25)	(0.10)
Net Asset Value, End of Period	$18.38	$16.98	$14.97	$19.74
Market Value, End of Period	$16.17	$14.60	$12.76	$20.05
Total Return Applicable To Common Shareholders
Total Return^(d)	12.15%	22.06%	(18.85)%	(0.79)%
Total Return, Market Value^(d)	14.75%	23.13%	(31.90)%	0.78%
Ratios to Average Net Assets
Net Investment Income (Loss) Ratio^(e)	2.93%	3.48%	3.08%	2.80%
Expenses, After Expense Reductions Ratio	1.63%	1.66%	1.65%	1.65%
Expenses, Before Expense Reductions Ratio	1.63%	1.68%	1.70%	1.69%
Supplemental Data
Portfolio Turnover Rate^(d)	28.06%	43.27%	58.30%	27.91%
Net Assets at End of Period (Thousands)	$589,574	$544,878	$480,381	$633,163

(a)	Unaudited Six Month Period Ended March 31.
(b)	The Trust commenced operations on July 28, 2021.
(c)	Unless otherwise noted, periods are fiscal years ended September 30.
(d)	Not annualized for periods less than one year.
(e)	Net investment income (loss) includes income from foreign withholding tax claims adjusted for IRS compliance fees and/or tax reclaim collection fees. Without these proceeds, the Net Investment Income (Loss) ratio for 2023 would have been 3.46%.

See notes to financial statements.

26 | Semi-Annual Report

Other Information
March 31, 2024 (Unaudited)

PORTFOLIO PROXY VOTING

Policies and Procedures:

The Trust has delegated to the Advisor voting decisions respecting proxies for the Trust’s voting securities. The Advisor makes voting decisions in accordance with its Proxy Voting Policy and Procedures. A description of the Policy and Procedures is available (i) without charge, upon request, by calling the Advisor toll-free at 1-800-847-0200, (ii) on the Thornburg website at www.thornburg.com, and (iii) on the U.S. Securities and Exchange Commission’s website at www.sec.gov.

Information regarding how proxies were voted is available on or before August 31 of each year for the twelve months ending the preceding June 30. This information is available (i) without charge, upon request by calling the Advisor toll-free at 1-800-847-0200, (ii) on the Thornburg website at www.thornburg.com, and (iii) on the U.S. Securities and Exchange Commission’s website at www.sec.gov.

DIVIDEND REINVESTMENT PLAN

The Trust has an automatic dividend reinvestment plan (the "Plan") commonly referred to as an “opt-out” plan. Unless the registered owner of common shares elects to receive cash by contacting Computershare (the “Plan Administrator”), all dividends declared on common shares will be automatically reinvested by the Plan Administrator for shareholders in the Trust’s Automatic Dividend Reinvestment Plan (the “Plan”), in additional common shares. Common shareholders who elect not to participate in the Plan will receive all dividends and other distributions in cash paid by check mailed directly to the shareholder of record (or, if the common shares are held in street or other nominee name, then to such nominee) by the Plan Administrator as dividend disbursing agent. Participation in the Plan is completely voluntary and may be terminated or resumed at any time without penalty by notice if received and processed by the Plan Administrator prior to the dividend record date; otherwise such termination or resumption will be effective with respect to any subsequently declared dividend or other distribution. Such notice will be effective with respect to a particular dividend or other distribution (together, a “Dividend”). Some brokers may automatically elect to receive cash on behalf of common shareholders and may re-invest that cash in additional common shares. Reinvested Dividends will increase the Trust’s Managed Assets on which the management fee is payable to the Advisor.

Whenever the Trust declares a Dividend payable in cash, non-participants in the Plan will receive cash and participants in the Plan will receive the equivalent in common shares. The common shares will be acquired by the Plan Administrator for the participants’ accounts, depending upon the circumstances described below, either (i) through receipt of additional unissued but authorized common shares from the Trust (“Newly Issued common shares”) or (ii) by purchase of outstanding common shares on the open market (“Open-Market Purchases”) on the NASDAQ or elsewhere. If, on the payment date for any Dividend, the closing market price plus estimated brokerage commissions per common share is equal to or greater than the NAV per common share, the Plan Administrator will invest the Dividend amount in Newly Issued common shares on behalf of the participants. The number of Newly Issued common shares to be credited to each participant’s account will be determined by dividing the dollar amount of the Dividend by the Trust’s NAV per common share on the payment date. If, on the payment date for any Dividend, the NAV per common share is greater than the closing market value plus estimated brokerage commissions (i.e., the Trust’s common shares are trading at a discount), the Plan Administrator will invest the Dividend amount in common shares acquired on behalf of the participants in Open-Market Purchases.

In the event of a market discount on the payment date for any Dividend, the Plan Administrator will have until the last business day before the next date on which the common shares trade on an “ex-dividend” basis or 30 days after the payment date for such Dividend, whichever is sooner (the “Last Purchase Date”), to invest the Dividend amount in common shares acquired in Open-Market Purchases. It is contemplated that the Trust will pay monthly income Dividends. If, before the Plan Administrator has completed its Open-Market Purchases, the market price per common share exceeds the NAV per common share, the average per common share purchase price paid by the Plan Administrator may exceed the NAV of the common shares, resulting in the acquisition of fewer common shares than if the Dividend had been paid in Newly Issued common shares on the Dividend payment date. Because of the foregoing difficulty with respect to Open-Market Purchases, the Plan provides that if the Plan Administrator is unable to invest the full Dividend amount in Open-Market Purchases during the purchase period or if the market discount shifts to a market premium during the purchase period, the Plan Administrator may cease making Open-Market Purchases and may invest the uninvested portion of the Dividend amount in Newly Issued common shares at the NAV per common share at the close of business on the Last Purchase Date.

The Plan Administrator maintains all shareholders’ accounts in the Plan and furnishes written confirmation of all transactions in the accounts, including information needed by shareholders for tax records. Common shares in the account of each Plan participant will be held by the Plan Administrator on behalf of the Plan participant, and each shareholder proxy will include those shares purchased or received pursuant to the Plan. The Plan Administrator will forward all proxy solicitation materials to participants and vote proxies for shares held under the Plan in accordance with the instructions of the participants.

Beneficial owners of common shares who hold their common shares in the name of a broker or nominee should contact the broker or nominee to determine whether and how they may participate in the Plan. In the case of common shareholders such as banks, brokers or nominees that hold shares for others who are the beneficial owners, the Plan Administrator will administer the Plan on the basis of the

Semi-Annual Report | 27

Other Information, Continued
March 31, 2024 (Unaudited)

number of common shares certified from time to time by the record shareholder’s name and held for the account of beneficial owners who participate in the Plan.

There will be no brokerage charges with respect to common shares issued directly by the Trust. However, each participant will pay a pro rata share of brokerage commissions incurred in connection with Open-Market Purchases. The automatic reinvestment of Dividends will not relieve participants of any federal, state or local income tax that may be payable (or required to be withheld) on such Dividends, even though such participants have not received any cash with which to pay the resulting tax. Participants that request a sale of common shares through the Plan Administrator are subject to brokerage commissions.

AVAILABILITY OF QUARTERLY PORTFOLIO SCHEDULE

The Trust files with the U.S. Securities and Exchange Commission schedules of its portfolio holdings on Form N-PORT EX for the first and third quarters of each fiscal year. The Trust’s Form N-PORT EX are available on the Commission’s website at www.sec.gov. The Trust also makes this information available on its website at www.thornburg.com/product/closed-end-funds/cib or upon request by calling 1-800-847-0200.

SHAREHOLDER MEETING INFORMATION

The Trust held its Annual Meeting of Shareholders on March 14, 2024, to elect two Class II Trustees of the Trust for a term expiring at the annual meeting of shareholders in 2027 or until their successors have been duly elected and qualify. Listed below are the results of the voting.

	Votes For	Votes Against/Withheld
Nimish S. Bhatt	20,862,424	2,412,472
Dina A. Tantra	20,869,607	2,405,289

28 | Semi-Annual Report

Thornburg Funds

Thornburg Investment Management is a privately-owned global investment firm that offers a range of solutions for retail and institutional investors. Founded in 1982 and headquartered in Santa Fe, New Mexico, we manage approximately $44.3 billion (as of March 31, 2024) across U.S. mutual funds, separate accounts for high-net-worth investors, institutional accounts, and UCITS funds for non-U.S. investors.

The Fund outlined in this report is one of many equity, multi-asset, and fixed-income products available from Thornburg Investment Management.

GLOBAL EQUITY

■	Thornburg Global Opportunities Fund

INTERNATIONAL EQUITY

■	Thornburg International Equity Fund
■	Thornburg Better World International Fund
■	Thornburg International Growth Fund
■	Thornburg Developing World Fund

U.S. EQUITY

■	Thornburg Small/Mid Cap Core Fund
■	Thornburg Small/Mid Cap Growth Fund

MULTI ASSET

■	Thornburg Investment Income Builder Fund
■	Thornburg Income Builder Opportunities Trust
■	Thornburg Summit Fund

TAXABLE FIXED INCOME

■	Thornburg Ultra Short Income Fund
■	Thornburg Limited Term U.S. Government Fund
■	Thornburg Limited Term Income Fund
■	Thornburg Core Plus Bond Fund
■	Thornburg Strategic Income Fund

MUNICIPAL FIXED INCOME

■	Thornburg Short Duration Municipal Fund
■	Thornburg Limited Term Municipal Fund
■	Thornburg Intermediate Municipal Fund
■	Thornburg Strategic Municipal Income Fund
■	Thornburg California Limited Term Municipal Fund
■	Thornburg New Mexico Intermediate Municipal Fund
■	Thornburg New York Intermediate Municipal Fund

Before investing, carefully consider each Fund’s investment goals, risks, charges, and expenses. For a prospectus or summary prospectus containing this and other information, contact your financial advisor or visit thornburg.com. Read it carefully before investing.

For additional information, please visit thornburg.com

Thornburg Investment Management, Inc. 2300 North Ridgetop Road, Santa Fe, NM 87506

Semi-Annual Report | 29

SHARE CLASS	NASDAQ SYMBOL
Common Shares	TBLD

INVESTMENT INCOME
Dividend income
Non-affiliated issuers	$ 7,143,948
Non-controlled affiliated issuers	1,274,409
Dividend taxes withheld	(514,062)
Interest income	4,992,953
Total Income	12,897,248
EXPENSES
Investment management fees	3,539,153
Administration fees	249,161
Transfer agent fees	18,573
Custodian fees	65,940
Professional fees	381,255
Trustee and officer fees	88,785
Other expenses	259,582
Total Expenses	4,602,449
Net Investment Income (Loss)	$ 8,294,799
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) on:
Non-affiliated issuers investments	10,610,827
Options written	3,752,968
Foreign currency transactions	(2,863,846)
Net realized gain (loss)	11,499,949
Net change in unrealized appreciation (depreciation) on:
Non-affiliated issuers investments	45,650,532
Options written	(700,967)
Foreign currency translations	3,324
Change in net unrealized appreciation (depreciation)	44,952,889
Net Realized and Unrealized Gain (Loss)	56,452,838
Change in Net Assets Resulting from Operations	$ 64,747,637

	Six Months Ended March 31, 2024*	Year Ended September 30, 2023
INCREASE (DECREASE) IN NET ASSETS FROM
OPERATIONS
Net investment income	$ 8,294,799	$ 19,038,924
Net realized gain (loss)	11,499,949	23,340,904
Net change in unrealized appreciation (depreciation)	44,952,889	62,221,154
Net Increase (Decrease) in Net Assets Resulting from Operations	64,747,637	104,600,982
DIVIDENDS TO SHAREHOLDERS
From distributable earnings
Common Shares	(20,051,819)	(40,103,637)
Net Increase (Decrease) in Net Assets	44,695,818	64,497,345
NET ASSETS
Beginning of Period	544,878,354	480,381,009
End of Period	$ 589,574,172	$ 544,878,354


(a) (1)		Not applicable

(a) (2)		Certifications pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 70.30a-2(a)) attached hereto as Exhibit 99.CERT.

(a) (3)		Not Applicable

(b)		Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and Rule 30a-2(b) under the Investment Company Act of 1940 (17 CFR 70.30a-2(b)) attached hereto as Exhibit 99.906CERT.


By:		/s/ Nimish Bhatt
		Nimish Bhatt
		President and principal executive officer

Date:		May 15, 2024

Performance Summary	4
Fund Summary	5
Schedule of Investments	6
Statement of Assets and Liabilities	15
Statement of Operations	16
Statement of Changes in Net Assets	17
Notes to Financial Statements	18
Financial Highlights	26
Other Information	27