Summary Prospectus |  December 19, 2022​

Schwab® Short-Term Bond Index Fund​

Ticker Symbol: SWSBX

Before you invest, you may want to review the fund’s prospectus, which contains more information about the fund and its risks. You can find the fund’s prospectus, Statement of Additional Information (SAI), reports to shareholders and other information about the fund online at www.schwabassetmanagement.com/schwabfunds_prospectus. You can also obtain this information at no cost by calling
1-866-414-6349 or by sending an email request to orders@mysummaryprospectus.com. If you purchase or hold fund shares through a financial intermediary, the fund’s prospectus, SAI, reports to shareholders and other information about the fund are available from your financial intermediary.

The fund’s prospectus and SAI, both dated December 19, 2022, include a more detailed discussion of fund investment policies and the risks associated with various fund investments. The prospectus and SAI are incorporated by reference into the summary prospectus, making them legally a part of the summary prospectus.

Investment Objective

The fund’s goal is to track as closely as possible, before fees and expenses, the total return of an index composed of U.S. investment grade government related and corporate bonds with maturities between 1-5 years.

Fund Fees and Expenses

This table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.

Shareholder Fees (fees paid directly from your investment)
​	None

Annual Fund Operating Expenses (expenses that you pay each year as a % of the value of your investment)
Management fees	0.06
Other expenses	None
Total annual fund operating expenses	0.06

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those time periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.

Expenses on a $10,000 Investment
1 Year			3 Years			5 Years			10 Years
​	$	6	​	$	19	​	$	34	​	$	77

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 59% of the average value of its portfolio.

Principal Investment Strategies

To pursue its goal, the fund generally invests in securities that are included in the Bloomberg US Government/Credit 1-5 Year Index†. The index is a broad-based benchmark measuring the performance of U.S. dollar-denominated U.S. Treasury bonds, government related bonds (i.e., U.S. and non-U.S. agencies, sovereign, quasi-sovereign, supranational and local authority debt) and investment grade U.S. corporate bonds that have a remaining maturity of greater than or equal to one year and less than five years. To be eligible for inclusion in the index, securities must be fixed rate, non-convertible, U.S. dollar-denominated with at least $300 million or more of outstanding face value and have a remaining maturity greater than or equal to one year and less than five years. The index excludes certain types of securities, including, bonds with equity type features (e.g., warrants, convertibles and preferreds), tax-exempt municipal securities, inflation-linked bonds, floating rate

†

Index ownership — Bloomberg® and Bloomberg US Government/Credit 1-5 Year Index are service marks of Bloomberg Finance L.P. and its affiliates, including Bloomberg Index Services Limited (BISL), the administrator of the indices (collectively, “Bloomberg”). Bloomberg is not affiliated with Charles Schwab Investment Management, Inc., dba Schwab Asset Management, and Bloomberg does not approve, endorse, review, or recommend Schwab Short-Term Bond Index Fund. Bloomberg does not guarantee the timeliness, accurateness, or completeness of any data or information relating to Schwab Short-Term Bond Index Fund.

Schwab Short-Term Bond Index Fund | Summary Prospectus1​

REG95524-12   00280777​

issues, strips, private placements, U.S. dollar-denominated 25 and 50 par retail bonds, structured notes and pass-through certificates. The index is market capitalization weighted and the securities in the index are updated on the last business day of each month. As of August 31, 2022, there were approximately 3,218 securities in the index.

It is the fund’s policy that under normal circumstances it will invest at least 90% of its net assets (including, for this purpose, any borrowings for investment purposes) in securities included in the index. The fund will notify its shareholders at least 60 days before changing this policy. Under normal circumstances, the fund may invest up to 10% of its net assets in securities not included in its index. The principal types of these investments include those that the investment adviser believes will help the fund track the index, such as investments in (a) securities that are not represented in the index but the investment adviser anticipates will be added to the index; (b) high-quality liquid investments, such as securities issued by the U.S. government, its agencies or instrumentalities, including obligations that are not guaranteed by the U.S. Treasury, and obligations that are issued by private issuers; (c) other investment companies; and (d) derivatives, principally futures contracts. The fund may use futures contracts and other derivatives primarily to help manage interest rate exposure. The fund may also invest in cash and cash equivalents, including money market funds, and lend its securities to minimize the difference in performance that naturally exists between an index fund and its corresponding index.

Because it is not possible or practical to purchase all of the securities in the index, the fund’s investment adviser will seek to track the total return of the index by using sampling techniques. Sampling techniques involve investing in a limited number of index securities that, when taken together, are expected to perform similarly to the index as a whole. These techniques are based on a variety of factors, including interest rate and yield curve risk, maturity exposures, industry, sector and issuer weights, credit quality, and other risk factors and characteristics. The fund expects that its portfolio will hold less than the total number of securities in the index, but reserves the right to hold as many securities as it believes necessary to achieve the fund’s investment objective. The fund may sell securities that are represented in the index in anticipation of their removal from the index. In addition, the fund generally expects that its duration will closely correspond to the duration of the index, which as of August 31, 2022 was approximately 2.58 years.

The fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry, group of industries or sector to approximately the same extent that its index is so concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities), and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

The investment adviser seeks to achieve, over time, a correlation between the fund’s performance and that of its index, before fees and expenses, of 95% or better. However, there can be no guarantee that the fund will achieve a high degree of correlation with the index. A number of factors may affect the fund’s ability to achieve a high correlation with its index, including the degree to which the fund uses

a sampling technique (or otherwise gives a different weighting to a security than the index does). The correlation between the performance of the fund and its index may also diverge due to transaction costs, asset valuations, timing variances, and differences between the fund’s portfolio and the index resulting from legal restrictions (such as diversification requirements) that apply to the fund but not to the index.

Principal Risks

The fund is subject to risks, any of which could cause an investor to lose money. The fund’s principal risks include:

Market Risk. Financial markets rise and fall in response to a variety of factors, sometimes rapidly and unpredictably. Markets may be impacted by economic, political, regulatory and other conditions, including economic sanctions and other government actions. In addition, the occurrence of global events, such as war, terrorism, environmental disasters, natural disasters and epidemics, may also negatively affect the financial markets. As with any investment whose performance is tied to these markets, the value of an investment in the fund will fluctuate, which means that an investor could lose money over short or long periods.

Investment Style Risk. The fund is an index fund. Therefore, the fund follows the securities included in the index during upturns as well as downturns. Because of its indexing strategy, the fund does not take steps to reduce market exposure or to lessen the effects of a declining market. In addition, because of the fund’s expenses, the fund’s performance may be below that of the index. Errors relating to the index may occur from time to time and may not be identified by the index provider for a period of time. In addition, market disruptions could cause delays in the index’s rebalancing schedule. Such errors and/or market disruptions may result in losses for the fund.

Interest Rate Risk. Interest rates rise and fall over time. As with any investment whose yield reflects current interest rates, the fund’s yield will change over time. During periods when interest rates are low, the fund’s yield (and total return) also may be low. Changes in interest rates also may affect the fund’s share price: a rise in interest rates generally causes the fund’s share price to fall. The longer the fund’s portfolio duration, the more sensitive to interest rate movements its share price is likely to be. Also, a change in a central bank’s monetary policy or economic conditions, among other things, may result in a change in interest rates, which could have sudden and unpredictable effects on the markets and significantly impact the value of fixed-income securities in which the fund invests. A sudden or unpredictable rise in interest rates may cause volatility and the value of fixed-income securities to decline.

Credit Risk. A decline in the credit quality of an issuer, guarantor or liquidity provider of a portfolio investment or a counterparty could cause the fund to lose money or underperform. The fund could lose money if, due to a decline in credit quality, the issuer, guarantor or liquidity provider of a portfolio investment or a counterparty fails to make, or is perceived as being unable or unwilling to make, timely principal or interest payments or otherwise honor its obligations.

2Schwab Short-Term Bond Index Fund | Summary Prospectus

Sampling Index Tracking Risk. The fund may not fully replicate the index and may hold securities not included in the index. As a result, the fund is subject to the risk that the investment adviser’s investment management strategy, the implementation of which is subject to a number of constraints, may not produce the intended results. Because the fund utilizes a sampling approach it may not track the return of the index as well as it would if the fund purchased all of the securities in the index.

Tracking Error Risk. As an index fund, the fund seeks to track the performance of the index, although it may not be successful in doing so. The divergence between the performance of the fund and the index, positive or negative, is called “tracking error.” Tracking error can be caused by many factors and it may be significant.

Prepayment and Extension Risk. Certain fixed-income securities are subject to the risk that the securities may be paid off earlier or later than expected, especially during periods of falling or rising interest rates, respectively. Prepayments of obligations could cause the fund to forgo future interest income on the portion of the security’s principal repaid early and force the fund to reinvest that money at the lower prevailing interest rates. Extensions of obligations could cause the fund to exhibit additional volatility and hold securities paying lower-than-market rates of interest. Either case could hurt the fund’s performance.

Non-U.S. Issuer Risk. The fund may invest in U.S.-registered, dollar-denominated bonds of non-U.S. corporations, governments, agencies and supra-national entities. The fund’s investments in bonds of non-U.S. issuers may involve certain risks that are greater than those associated with investments in securities of U.S. issuers. These include risks of adverse changes in foreign economic, political, regulatory and other conditions; the imposition of economic sanctions or other government restrictions; differing accounting, auditing, financial reporting and legal standards and practices; differing securities market structures; and higher transaction costs. These risks may be heightened in connection with bonds issued by non-U.S. corporations and entities in emerging markets.

Derivatives Risk. The fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The fund’s use of derivatives could reduce the fund’s performance, increase its volatility and cause the fund to lose more than the initial amount invested. In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the fund.

Liquidity Risk. The fund may be unable to sell certain securities, such as illiquid securities, readily at a favorable time or price, or the fund may have to sell them at a loss.

Concentration Risk. To the extent that the fund’s or the index’s portfolio is concentrated in the securities of issuers in a particular market, industry, group of industries, sector or asset class, the fund may be adversely affected by the performance of those securities,

may be subject to increased price volatility and may be more vulnerable to adverse economic, market, political or regulatory occurrences affecting that market, industry, group of industries, sector or asset class.

Leverage Risk. Certain fund transactions, such as derivatives transactions and mortgage dollar rolls, may give rise to a form of leverage and may expose the fund to greater risk. Leverage tends to magnify the effect of any decrease or increase in the value of the fund’s portfolio securities. The use of leverage may cause the fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations.

Securities Lending Risk. Securities lending involves the risk of loss of rights in, or delay in recovery of, the loaned securities if the borrower fails to return the security loaned or becomes insolvent.

Money Market Fund Risk. The fund may invest in underlying money market funds that either seek to maintain a stable $1.00 net asset value (“stable share price money market funds”) or that have a share price that fluctuates (“variable share price money market funds”). Although an underlying stable share price money market fund seeks to maintain a stable $1.00 net asset value, it is possible to lose money by investing in such a money market fund. Because the share price of an underlying variable share price money market fund will fluctuate, when the fund sells the shares it owns they may be worth more or less than what the fund originally paid for them. In addition, neither type of money market fund is designed to offer capital appreciation. Certain underlying money market funds may impose a fee upon the sale of shares or may temporarily suspend the ability to sell shares if such fund’s liquidity falls below required minimums.

For more information on the risks of investing in the fund, please see the “Fund Details” section in the prospectus.

Performance

The bar chart below shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compared to that of the index. This information provides some indication of the risks of investing in the fund. All figures assume distributions were reinvested. Keep in mind that future performance (both before and after taxes) may differ from past performance. For current performance information, please see
www.schwabassetmanagement.com/schwabfunds_prospectus.

Schwab Short-Term Bond Index Fund | Summary Prospectus3​

Annual Total Returns (%) as of 12/31

Best Quarter: 2.23% Q1 2020

Worst Quarter: (0.76%) Q4 2021

Year-to-date performance (before taxes) as of 9/30/22: (6.64%)

Average Annual Total Returns as of 12/31/21
​	1 Year		Since Inception (2/23/17)
Before taxes	​	(1.05%)	​	2.11%
After taxes on distributions	​	(1.48%)	​	1.36%
After taxes on distributions and sale of shares	​	(0.57%)	​	1.30%
Comparative Index (reflects no deduction for expenses or taxes)	​	​	​	​
Bloomberg US Government/Credit 1-5 Year Index	​	(0.97%)	​	2.24%

The after-tax figures reflect the highest individual federal income tax rates in effect during the period and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, an individual retirement account (IRA) or other tax-advantaged account. In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.

Investment Adviser

Charles Schwab Investment Management, Inc., dba Schwab Asset Management™

Portfolio Managers

Matthew Hastings, CFA, Managing Director and Head of Taxable Bond Strategies, is responsible for the day-to-day co-management of the fund. He has managed the fund since 2017.

Steven Hung, Senior Portfolio Manager, is responsible for the day-to-day co-management of the fund. He has managed the fund since 2017.

Mark McKissick, CFA, Senior Portfolio Manager, is responsible for the day-to-day co-management of the fund. He has managed the fund since 2017.

Purchase and Sale of Fund Shares

The fund is open for business each day that the New York Stock Exchange (NYSE) is open. If the NYSE is closed due to weather or

other extenuating circumstances on a day it would typically be open for business, or the NYSE has an unscheduled early closing on a day it has opened for business, the fund reserves the right to treat such day as a business day and accept purchase and redemption orders and calculate its share price as of the normally scheduled close of regular trading on the NYSE for that day.

Investors may only invest in the fund through an account at Charles Schwab & Co., Inc. (Schwab) or another financial intermediary. When you place orders to purchase, exchange or redeem fund shares through an account at Schwab or another financial intermediary, you must follow Schwab’s or the other financial intermediary’s transaction procedures.

There is no minimum initial investment for the fund.

Tax Information

Dividends and capital gains distributions received from the fund will generally be taxable as ordinary income or capital gains, unless you are investing through an IRA, 401(k) or other tax-advantaged account (in which case you may be taxed later, upon withdrawal of your investment from such account).

Payments to Financial Intermediaries

If you purchase shares of the fund through a broker-dealer or other financial intermediary (such as a bank), the adviser and its related companies may pay the intermediary for the sale of fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other financial intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

4Schwab Short-Term Bond Index Fund | Summary Prospectus