Summary Prospectus | February 1, 2020

DWS GNMA Fund

Class/Ticker

GGGGX

GIGTX

GCGGX

GRGGX

GRRGX

INST

GIGGX

SGINX

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, reports to shareholders, Statement of Additional Information (SAI) and other information about the fund online at dws.com/mutualpros. You can also get this information at no cost by e-mailing a request to service@dws.com, calling (800) 728-3337 or asking your financial representative. The Prospectus and SAI, both dated February 1, 2020, as supplemented, are incorporated by reference into this Summary Prospectus.

Beginning on January 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the fund’s annual and semi-annual shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports. Instead, the reports will be made available on the fund’s Web site (dws.com), and you will be notified by mail each time a report is posted and provided with a Web site link to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive shareholder reports and other communications from the fund electronically anytime by contacting your financial intermediary (such as a broker-dealer or bank), or if you are a direct investor, by calling (800) 728-3337 or sending an email request to service@dws.com.

You may elect to receive all future reports in paper free of charge. If you invest through a financial intermediary, you can contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. If you invest directly with the fund, you can call (800) 728-3337 or send an email request to service@dws.com to continue receiving paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held in your account if you invest through your financial intermediary or all funds held with DWS if you invest directly with the fund.

Investment Objective

The fund seeks to produce a high level of income.

Fees and Expenses

These are the fees and expenses you may pay when you buy and hold shares. You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Class S shares, which are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $100,000 in

Class A shares in DWS funds or if you invest at least $250,000 in Class T shares in the fund. More information about these and other discounts and waivers is available from your financial representative and in Choosing a Share Class in the prospectus (p. 46), Sales Charge Waivers and Discounts Available Through Intermediaries in the prospectus (Appendix B, p. 108) and Purchase and Redemption of Shares in the fund’s SAI (p. II-14).

SHAREHOLDER FEES (paid directly from your investment)

	A	T	C	R	R6	INST	S
Maximum sales charge (load) imposed on purchases, as % of offering price	2.75	2.50	None	None	None	None	None
Maximum deferred sales charge (load), as % of redemption proceeds¹	None	None	1.00	None	None	None	None
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	$20	None	$20	None	None	None	$20

ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a % of the value of your investment)

	A	T	C	R	R6	INST	S
Management fee	0.31	0.31	0.31	0.31	0.31	0.31	0.31
Distribution/service (12b-1) fees	0.23	0.25	1.00	0.50	None	None	None
Other expenses	0.25	0.26	0.26	0.41	0.17	0.23	0.25
Total annual fund operating expenses	0.79	0.82	1.57	1.22	0.48	0.54	0.56
Fee waiver/expense reimbursement	0.00	0.00	0.00	0.05	0.00	0.00	0.00
Total annual fund operating expenses after fee waiver/expense reimbursement	0.79	0.82	1.57	1.17	0.48	0.54	0.56

¹ Investments of $250,000 or more may be eligible to buy Class A shares without a sales charge (load), but may be subject to a contingent deferred sales charge of 0.50% if redeemed within 12 months of the original purchase date.

The Advisor has contractually agreed through January 31, 2021 to waive its fees and/or reimburse fund expenses to the extent necessary to maintain the fund’s total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage, interest expense and acquired fund fees and expenses) at a ratio no higher than 1.17% for Class R. The agreement may only be terminated with the consent of the fund’s Board.

EXAMPLE

This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual 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 periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses (including one year of capped expenses in each period for Class R) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Years	A	T	C	R	R6	INST	S
1	$353	$332	$260	$119	$49	$55	$57
3	520	505	496	382	154	173	179
5	702	694	855	666	269	302	313
10	1,226	1,238	1,867	1,473	604	677	701

You would pay the following expenses if you did not redeem your shares:

Years	A	T	C	R	R6	INST	S
1	$353	$332	$160	$119	$49	$55	$57
3	520	505	496	382	154	173	179
5	702	694	855	666	269	302	313
10	1,226	1,238	1,867	1,473	604	677	701

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 mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 317% of the average value of its portfolio.

Principal Investment Strategies

Main investments. Under normal circumstances, the fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in “Ginnie Maes,”

which are mortgage-backed securities that are issued or guaranteed by the Government National Mortgage Association (GNMA). For purposes of the fund's 80% investment policy, investments in “Ginnie Maes” include investments in collateralized mortgage obligations collateralized by a pool of mortgage backed securities guaranteed by GNMA. The fund may also purchase or sell securities on a when-issued, delayed delivery or forward commitment basis, including US government agency mortgage-backed to-be-announced securities (TBAs). A forward commitment transaction is an agreement by the fund to purchase or sell securities at a specified future date. The fund may sell the forward commitment securities before the settlement date or enter into new commitments to extend the delivery date into the future.

The balance of the fund’s assets, among other permitted investments, may be invested in securities issued by the US government, its agencies or instrumentalities. These securities may not be guaranteed by the US Treasury or backed by the full faith and credit of the US government. The fund may also hold up to 10% of its total net assets in uninvested cash, cash equivalents (such as money market securities), repurchase agreements or shares of money market funds or short-term bond funds, which investments may not be issued or guaranteed by the US government, its agencies or instrumentalities. Because the fund may invest in fixed income securities of varying maturities, the fund's dollar-weighted average effective portfolio maturity will vary. As of December 31, 2019, the fund had a dollar-weighted average effective portfolio maturity of 6.01 years.

Management process. In deciding which types of securities to buy and sell, portfolio management first considers the relative attractiveness of Ginnie Maes compared to other eligible securities and decides on allocations. The decisions are generally based on a number of factors, including changes in supply and demand within the bond market and prepayment rates of individual bonds.

In choosing individual bonds, portfolio management reviews each bond’s fundamentals, compares the yields of bonds and uses detailed analysis to project prepayment rates and other factors that could affect a bond’s attractiveness. Portfolio management may also adjust the duration (a measure of sensitivity to interest rate movements) of the fund’s portfolio, based upon their analysis.

Derivatives. Portfolio management generally may use interest rate futures contracts or interest rate swaps, which are types of derivatives (a contract whose value is based on, for example, indices, currencies or securities) for duration management (i.e., reducing or increasing the sensitivity of the fund’s portfolio to interest rate changes). Portfolio management may, from time to time, seek to enhance returns by employing various strategies to identify interest rate trends across developed markets using derivatives, including interest rate futures contracts, interest rate swaps and foreign currency transactions. In

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Summary Prospectus February 1, 2020

addition, portfolio management generally may use (i) options on GNMA TBAs or total return swaps to seek to enhance potential gains; and (ii) options on interest rate futures or on interest rates to hedge against potential adverse interest rate movements.

The fund may also use other types of derivatives (i) for hedging purposes; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

Securities lending. The fund may lend securities (up to one-third of total assets) to approved institutions, such as registered broker-dealers, banks and pooled investment vehicles.

Active trading. The fund may trade securities actively and this may lead to high portfolio turnover.

Main Risks

There are several risk factors that could hurt the fund’s performance, cause you to lose money or cause the fund’s performance to trail that of other investments. The fund may not achieve its investment objective, and is not intended to be a complete investment program. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

Mortgage-backed securities risk. These securities represent interests in “pools” of mortgages and often involve risks that are different from or possibly more acute than risks associated with other types of debt instruments. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, however, mortgage refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of mortgage-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the fund. Conversely, when market interest rates decline, while the value of mortgage-backed securities may increase, the rate of prepayment of the underlying mortgages also tends to increase, which shortens the effective duration of these securities and may expose the fund to a lower rate of return on investment.

Interest rate risk. When interest rates rise, prices of debt securities generally decline. The longer the duration of the fund’s debt securities, the more sensitive the fund will be to interest rate changes. (As a general rule, a 1% rise in interest rates means a 1% fall in value for every year of duration.) Recent and potential future changes in monetary policy made by central banks or governments are likely to affect the level of interest rates. Rising interest rates may prompt redemptions from the fund, which may force the

fund to sell investments at a time when it is not advantageous to do so, which could result in losses. The fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates.

Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund’s assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund’s share price and yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances.

Credit risk. The fund's performance could be hurt if an issuer of a debt security suffers an adverse change in financial condition that results in the issuer not making timely payments of interest or principal, a security downgrade or an inability to meet a financial obligation.

Because of the rising US government debt burden, it is possible that the US government may not be able to meet its financial obligations or that securities issued by the US government may experience credit downgrades. Such a credit event may also adversely impact the financial markets and the fund.

Security selection risk. The securities in the fund’s portfolio may decline in value. Portfolio management could be wrong in its analysis of industries, companies, economic trends, the relative attractiveness of different securities or other matters.

Securities lending risk. Any decline in the value of a portfolio security that occurs while the security is out on loan is borne by the fund and will adversely affect performance. Also, there may be delays in recovery of securities loaned or even a loss of rights in the collateral should the borrower of the securities fail financially while holding the security.

Derivatives risk. Risks associated with derivatives may include the risk that the derivative is not well correlated with the security, index or currency to which it relates; the risk that derivatives may result in losses or missed opportunities; the risk that the fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; and the risk that the derivative transaction could expose the fund to the effects of leverage, which could increase the fund's exposure to the market and magnify potential losses.

To the extent portfolio management seeks to identify interest rate trends using derivatives, the risk of loss may be heightened during periods of rapid changes in interest rates.

3	DWS GNMA Fund

Summary Prospectus February 1, 2020

Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment and/or the fund may sell certain investments at a price or time that is not advantageous in order to meet redemption requests or other cash needs. Unusual market conditions, such as an unusually high volume of redemptions or other similar conditions could increase liquidity risk for the fund, and in extreme conditions, the fund could have difficulty meeting redemption requests.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different from the value realized upon such investment’s sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Currency risk. Changes in currency exchange rates may affect the value of the fund’s investments and the fund’s share price. The value of currencies are influenced by a variety of factors, that include: interest rates, national debt levels and trade deficits, changes in balances of payments and trade, domestic and foreign interest and inflation rates, global or regional political, economic or financial events, monetary policies of governments, actual or potential government intervention, global energy prices, political instability and government monetary policies and the buying or selling of currency by a country’s government. Investments in foreign currencies are subject to the risk that those currencies will decline in value relative to the US dollar or, in the case of hedged positions, that the US dollar will decline relative to the currency being hedged. Currency exchange rates can be volatile and can change quickly and unpredictably, thereby impacting the value of the fund’s investments.

Forward commitment risk. When a fund engages in when-issued, delayed delivery or forward commitment transactions (e.g., TBAs), the fund relies on the counterparty to consummate the sale. Failure to do so may result in the fund missing the opportunity to obtain a price or yield considered to be advantageous. Such transactions may also have the effect of leverage on the fund and may cause the fund to be more volatile. Additionally, these transactions may create a higher portfolio turnover rate.

Operational and technology risk. Cyber-attacks, disruptions, or failures that affect the fund’s service providers or counterparties, issuers of securities held by the fund, or

other market participants may adversely affect the fund and its shareholders, including by causing losses for the fund or impairing fund operations.

Active trading risk. Active securities trading could raise transaction costs (thus lowering returns) and could mean increased taxable distributions to shareholders and distributions that will be taxable to shareholders at higher federal income tax rates.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends and distributions were reinvested. For more recent performance figures, go to dws.com (the Web site does not form a part of this prospectus) or call the telephone number included in this prospectus.

The bar chart and the after-tax returns below are shown for Class A shares (instead of Class S shares, which had been used in the past) because Class A shares now have 10 or more years of annual returns and are available to most investors.

The performance figures for Class R shares prior to class inception are based on the historical performance of the fund’s Class S shares adjusted to reflect the higher expenses of Class R.

The performance figures for Class T shares prior to class inception are based on the historical performance of the fund’s Class S shares adjusted to reflect the higher expenses and applicable sales charges of Class T.

CALENDAR YEAR TOTAL RETURNS (%) (Class A)

These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.

	Returns	Period ending
Best Quarter	4.13%	June 30, 2010
Worst Quarter	-4.53%	June 30, 2013

Average Annual Total Returns
(For periods ended 12/31/2019 expressed as a %)

After-tax returns (which are shown only for Class A and would be different for other classes) reflect the historical highest individual federal income tax rates, but do not reflect any state or local taxes. Your actual after-tax returns

4	DWS GNMA Fund

Summary Prospectus February 1, 2020

may be different. After-tax returns are not relevant to shares held in an IRA, 401(k) or other tax-advantaged investment plan.

	Class Inception	1 Year	5 Years	10 Years
Class A before tax	2/2/2009	3.48	1.16	2.23
After tax on distributions		2.33	-0.01	0.89
After tax on distributions and sale of fund shares		2.04	0.35	1.16
Class T before tax	6/5/2017	3.72	1.15	2.19
Class C before tax	2/2/2009	5.56	0.93	1.74
Class R before tax	5/1/2012	6.05	1.40	2.16
INST Class before tax	2/2/2009	6.73	1.98	2.81
Class S before tax	7/14/2000	6.65	1.97	2.77
Bloomberg Barclays GNMA Index (reflects no deduction for fees, expenses or taxes)		5.85	2.32	3.21

	Class Inception	1 Year	Since Inception
Class R6 before tax	2/2/2015	6.74	2.06
Bloomberg Barclays GNMA Index (reflects no deduction for fees, expenses or taxes)		5.85	2.27

Management

Investment Advisor

DWS Investment Management Americas, Inc.

Portfolio Manager(s)

Scott Agi, CFA, Director. Portfolio Manager of the fund. Began managing the fund in 2014.

Gregory M. Staples, CFA, Managing Director. Portfolio Manager of the fund. Began managing the fund in 2016.

Purchase and Sale of Fund Shares

Minimum Initial Investment ($)

	Non-IRA	IRAs	UGMAs/ UTMAs	Automatic Investment Plans
A T C	1,000	500	1,000	500
R	None	N/A	N/A	N/A
R6	None	N/A	N/A	N/A
INST	1,000,000	N/A	N/A	N/A
S	2,500	1,000	1,000	1,000

For participants in all group retirement plans for Class A, T, C and S shares, and in certain fee-based and wrap programs approved by the Advisor for Class A, C and S shares, there is no minimum initial investment and no minimum additional investment. For Section 529 college savings plans, there is no minimum initial investment and no minimum additional investment for Class S shares and Class R6 shares. Certain intermediaries that offer Class S shares in their brokerage platforms may be eligible for an investment minimum waiver. In certain instances, the minimum initial investment may be waived for Institutional Class shares. There is no minimum additional investment for Class R, Class R6 and Institutional Class shares. The minimum additional investment in all other instances is $50.

To Place Orders

Mail	New Accounts	DWS PO Box 219356 Kansas City, MO 64121-9356
	Additional Investments	DWS PO Box 219154 Kansas City, MO 64121-9154
	Exchanges and Redemptions	DWS PO Box 219557 Kansas City, MO 64121-9557
Expedited Mail		DWS 210 West 10th Street Kansas City, MO 64105-1614
Web Site		dws.com
Telephone		(800) 728-3337, M – F 8 a.m. – 7 p.m. ET
TDD Line		(800) 972-3006, M – F 8 a.m. – 7 p.m. ET

The fund is generally open on days when the New York Stock Exchange is open for regular trading. Initial investments must be sent by mail. You can make additional investments or sell shares of the fund on any business day by visiting our Web site, by mail, or by telephone; however you may have to elect certain privileges on your initial account application. If you are working with a financial representative, contact your financial representative for assistance with buying or selling fund shares. A financial representative separately may impose its own policies and procedures for buying and selling fund shares.

Class T shares are closed to new purchases, except in connection with the reinvestment of dividends or other distributions where Class T shares have been issued. Class R shares are generally available only to certain retirement plans, which may have their own policies or instructions for buying and selling fund shares. Class R6 shares are generally available only to certain qualifying plans and programs, which may have their own policies or instructions for buying and selling fund shares. Institutional Class shares are generally available only to qualified institutions. Class S shares are only available to a limited group of investors as well as through firms that have an agreement with DWS Distributors, Inc. to offer the shares on an agency basis on brokerage platforms.

5	DWS GNMA Fund

Summary Prospectus February 1, 2020

Tax Information

The fund's distributions are generally taxable to you as ordinary income or capital gains, except when your investment is in an IRA, 401(k), or other tax-advantaged investment plan. Any withdrawals you make from such tax- advantaged investment plans, however, may be taxable to you.

Payments to Broker-Dealers and
Other Financial Intermediaries

If you purchase shares of the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, the Advisor, and/or the Advisor’s affiliates 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 intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s Web site for more information.

No such payments are made with respect to Class R6 shares. To the extent the fund makes such payments with respect to another class of its shares, the expense is borne by the other share class.

6	DWS GNMA Fund

Summary Prospectus February 1, 2020 GNMA-SUM