Form 497K

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 and other information about the Fund online at www.TCW.com. You can also get this information at no cost by calling 1-800-241-4671 or by sending an email request to metwestclientservices@tcw.com. The Fund’s current Prospectus and Statement of Additional Information, both dated July 29, 2019, are incorporated by reference into this Summary Prospectus. The Securities and Exchange Commission has not approved or disapproved these securities or passed on the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Beginning on January 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Funds’ 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 Funds’ website (www.TCW.com), and you will be notified by mail each time a report is posted and provided with a website 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 electronically by contacting your financial intermediary (such as a broker-dealer, bank, or retirement plan), or by calling 1-800-FUND-TCW (1-800-386-3829) if you invest directly with the Funds.

You may elect to receive all future reports in paper free of charge. Contact your financial intermediary or, if you invest directly with the Funds, call 1-800-FUND-TCW (1-800-386-3829), to request that you continue receiving paper copies of your shareholder reports. Your election to receive reports in paper will apply to all Funds held through your financial intermediary or directly with TCW.

Investment Objective

The Floating Rate Income Fund seeks primarily to maximize current income, with a secondary objective of long-term capital appreciation.

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may pay additional fees to broker-dealers or other financial intermediaries for the purchase of Class I shares of the Fund.

Shareholder Fees (Fees paid directly from your investment)

None.

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)


	M Class		I Class
Management Fees		0.55%		0.55%
Distribution (12b-1) Fees		0.25%		None
Other Expenses		0.23%		0.16%
Shareholder Servicing Expenses¹		0.10%		0.03%
Total Annual Fund Operating Expenses		1.03%		0.71%
Fee Waiver and/or Expense Reimbursement²		(0.13)%		(0.01)%
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement		0.90%		0.70%

¹	The Fund is authorized to compensate broker-dealers and other third-party intermediaries up to 0.10% (10 basis points) of the M and I Class assets serviced by those intermediaries for shareholder services.

Metropolitan West Asset Management, LLC (the “Adviser”) has contractually agreed to reduce advisory fees and/or reimburse expenses, including distribution expenses, to limit the Fund’s total annual operating expenses (excluding interest, taxes, brokerage commissions, short sale dividend expenses, swap interest expenses, acquired fund fees and expenses, and any expenses incurred in connection with any merger or reorganization or extraordinary expenses such as litigation), to the net expenses shown in the table for the applicable class. The Adviser may recoup reduced fees and expenses only within three years, provided that the recoupment does not cause the Fund’s annual expense ratio to exceed the lesser of (i) the expense limitation applicable at the time of that fee waiver and/or expense reimbursement or (ii) the expense limitation in effect at the time of recoupment. This contract will remain in place until July 31, 2020. Although it does not expect to do so, the Board of Trustees is permitted to terminate that contract sooner in its discretion with written notice to the Adviser.

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 cost for the Fund reflects the net expenses of the Fund that result from the contractual expense limitation in the first year only (through July 31, 2020). The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


	1 Year		3 Years		5 Years		10 Years
Class M		$92		$315		$556		$1,248
Class I		$72		$226		$394		$882

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 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 52% of the average value of its portfolio.

Principal Investment Strategies

The Fund pursues its objective by investing, under normal circumstances, at least 80% of its net assets, plus any borrowings for investment purposes, in floating rate investments and in investments that are the economic equivalent of floating rate investments. These economically equivalent investments may include, but are not limited to, any combination of the following items: (i) senior secured floating rate loans or debt; (ii) second lien or other subordinated or unsecured floating rate loans or debt; (iii) fixed-rate loans or debt, such as corporate bonds, preferred securities, convertible securities, mezzanine investments, collateralized loan obligations, senior loans, second lien loans, structured products and U.S. government debt securities, with respect to which the Fund has entered into derivative instruments that have the effect of converting the fixed-rate interest payments into floating-rate interest payments; and (iv) written credit derivatives, which would give the Fund exposure to the credit of a single issuer or an index. The market value of written

credit derivatives would count toward the 80% test specified above. The Fund may also purchase, without limitation, participations or assignments in senior floating rate loans or second lien floating rate loans. Debt instruments include convertible or preferred securities that produce income.

The portfolio managers may consider many factors in purchasing and selling investments for the Fund, such as a fundamental analysis of the issuer, the credit quality of the issuer and collateral for the investment, capital structure, leverage, operating results for the issuer and the business outlook for the issuer, industry or broader economy.

The Fund’s investments may have any credit quality without limitation, including investments rated below investment grade (commonly known as “junk bonds”). Under normal circumstances, a substantial portion of the Fund’s portfolio consists of leveraged loans rated below investment grade or unrated.

The Fund may invest up to 20% of its net assets, plus any borrowings for investment purposes, in fixed income securities with respect to which the Fund has not entered into derivative instruments to effectively convert the fixed-rate interest payments into floating-rate interest payments. Those fixed income securities may include, but are not limited to, corporate bonds, preferred securities, convertible securities, mezzanine investments, collateralized loan obligations, senior loans, second lien loans, structured products and U.S. government debt securities.

The Fund’s portfolio securities may have any duration or maturity.

The Fund may invest in securities of foreign issuers, including issuers located in emerging markets. Under normal circumstances, the Fund invests at least 80% of its net assets in loans and other securities of U.S. issuers or issuers with their primary operations, assets or management activities in the U.S. (including limited purpose controlled affiliates outside of the U.S. that borrow or issue securities primarily for the benefit of their U.S. parent companies or affiliates). The Fund may invest up to 20% of its assets in securities of foreign issuers. Investments in securities of foreign issuers that are not denominated in U.S. dollars are limited to a maximum of 20% of the Fund’s assets. The Fund may invest up to 20% of its assets in emerging market securities.

Up to 15% of the Fund’s net assets may be invested in illiquid securities.

The Fund may also invest in companies whose financial condition is uncertain, where the borrower has defaulted in the payment of interest or principal or in the performance of its covenants or agreements, or that may be involved in bankruptcy proceedings, reorganizations or financial restructurings.

The Fund may invest up to 10% of its net assets in common stocks or other equity securities. In addition, the Fund may acquire and hold those securities (or rights to acquire such securities) in unit offerings with fixed income securities, in connection with an amendment, waiver, conversion or exchange of fixed income securities, in connection with the bankruptcy or workout of a distressed fixed income security, or upon the exercise of a right or warrant obtained on account of a fixed income security.

The Fund may invest in derivatives, primarily options or futures on a security or an index of securities, options on futures, credit default swaps, and interest rate or foreign currency derivatives, including swaps and forward contracts. The Fund may use derivatives for hedging purposes, but is not required to do so, as well as to increase the total return on its portfolio investments.

The Fund may sell securities and other instruments short provided that not more than 15% of its net assets are held as collateral for those transactions.

Principal Risks

Because the Fund holds investments with fluctuating market prices, the value of the Fund’s shares will vary as its portfolio holdings increase or decrease in value. Therefore, the value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund.

The principal risks affecting the Fund that can cause a decline in value are:

•

Debt Securities Risk: the risk that the value of a debt security may increase or decrease as a result of various factors, including changes in interest rates, actual or perceived inability or unwillingness of issuers to make principal or interest payments, market fluctuations and illiquidity in the debt securities market.

•

Market Risk: the risk that returns from the investments held by the Fund may underperform returns from the general securities markets or other types of securities.

•

Interest Rate Risk: the risk that investments held by the Fund may decline in value because of changes in interest rates.

•

Credit Risk: the risk that an issuer may default in the payment of principal and/or interest on a security.

•

Price Volatility Risk: the risk that the value of the Fund’s investment portfolio will change as the prices of its investments go up or down.

•

Issuer Risk: the risk that the value of a security may decline for reasons directly related to the issuer such as management performance, financial leverage and reduced demand for the issuer’s goods or services.

•

Liquidity Risk: the risk that lack of a ready market or restrictions on resale may limit the ability of the Fund to sell a security at an advantageous time or price. In addition, the Fund, by itself or together with other accounts managed by the Adviser, may hold a position in a security that is large relative to the typical trading volume for that security, which can make it difficult for the Fund to dispose of the position at an advantageous time or price. Although the Fund is normally able to sell loans within seven days, a substantial portion of the loans held by the Fund may also experience delayed settlement beyond that period, which can impair the ability of the Fund to pay redemptions or to re-invest proceeds, or may require the Fund to borrow to meet redemptions. Over recent years, the fixed-income markets have grown more than the ability of dealers to make markets, which can further constrain liquidity and increase the volatility of portfolio valuations. High levels of redemptions in bond funds in response to market conditions could cause greater losses as a result. Regulations such as the Volcker Rule or future regulations may further constrain the ability of market participants to create liquidity, particularly in times of increased market volatility. The liquidity of the Fund’s assets may change over time.

•

Valuation Risk: the risk that the portfolio instruments may be sold at prices different from the values established by the Fund, particularly for investments that trade in low volume, in volatile markets or over the counter or that are fair valued.

•

Bank Loan Risk: the risk of investing in corporate loans made by commercial banks and other financial institutions or institutional investors to companies that need capital to grow or restructure, which includes interest rate risk, liquidity risk and prepayment risk. The Fund may also be subject to the credit risk of other financial institutions and the risks associated with insufficient collateral securing a bank loan, limited available public information about a

bank loan, delayed settlement, and less protection for holders of bank loans as compared to holders of registered securities.

•

Junk Bond Risk: the risk that junk bonds have a higher degree of default risk and may be less liquid and subject to greater price volatility than investment grade bonds.

•

Unrated Securities Risk: the risk that unrated securities may be less liquid than comparable rated securities, and the risk that the Adviser may not accurately evaluate the security’s comparative credit rating.

•

Distressed and Defaulted Securities Risk: the risk that the repayment of defaulted securities and obligations of distressed issuers is subject to significant uncertainties.

•

Derivatives Risk: the risk of investing in derivative instruments, which includes liquidity, interest rate, market, credit and management risks as well as risks related to mispricing or improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, reference rate or index, and the Fund could lose more than the principal amount invested. These investments can create investment leverage and may create additional risks that may subject the Fund to greater volatility and less liquidity than investments in more traditional securities.

•

Swap Agreements Risk: the risk of investing in swaps, which, in addition to risks applicable to derivatives generally, includes: (1) the inability to assign a swap contract without the consent of the counterparty; (2) potential default of the counterparty to a swap for those not traded through a central counterparty; (3) absence of a liquid secondary market for any particular swap at any time; and (4) possible inability of the Fund to close out a swap transaction at a time that otherwise would be favorable for it to do so.

•

Leverage Risk: the risk that leverage may result from certain transactions, including the use of derivatives and borrowing. This may impair the Fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase its volatility or otherwise cause it not to achieve its intended result. To the extent required by applicable law or regulation, the Fund will reduce leverage risk either by segregating an equal amount of liquid assets or by “covering” the transactions that introduce such risk.

•

Counterparty Risk: the risk that the other party to a contract, such as a derivatives contract, may not fulfill its contractual obligations.

•

U.S. Government Securities Risk: the risk that debt securities issued or guaranteed by certain U.S. government

agencies, instrumentalities, and sponsored enterprises are not supported by the full faith and credit of the U.S. government, and as a result investments in securities or obligations issued by such entities involve credit risk greater than investments in other types of U.S. government securities.

•

Foreign Investing Risk: the risk that Fund share prices will fluctuate with market conditions, currency exchange rates and the economic and political climates of the foreign countries in which the Fund invests or has exposure. Investments in foreign securities may involve greater risks than investing in U.S. securities due to, among other factors, less publicly available information, less stringent and less uniform accounting, auditing and financial reporting standards, less liquid and more volatile markets, higher transaction and custody costs, additional taxes, less investor protection, delayed or less frequent settlement, political or social instability, civil unrest, acts of terrorism, and regional economic volatility.

•

Foreign Currency Risk: the risk that foreign currencies may decline in value relative to the U.S. dollar and affect the Fund’s investments in foreign currencies, in securities that are denominated, trade and/or receive revenues in foreign currencies, or in derivatives that provide exposure to foreign currencies.

•

Emerging Markets Risk: the risk of investing in emerging market countries, which is substantial due to, among other factors, higher brokerage costs in certain countries; different accounting standards; thinner trading markets as compared to those in developed countries; the possibility of currency transfer restrictions; and the risk of expropriation, nationalization or other adverse political, economic or social developments.

•

Short Sales Risk: the risk that the use of short sales, which are speculative investments, may cause the Fund to lose money if the value of a security does not go down as the Adviser expects. The risk of loss is theoretically unlimited if the value of the security sold short continues to increase. In addition, the use of borrowing and short sales may cause the Fund to have higher expenses (especially interest and dividend expenses) than those of other mutual funds that do not engage in short sales.

•

Equity Risk: the risk that stocks and other equity securities generally fluctuate in value more than bonds and may decline in value over short or extended periods as a result of changes in a company’s financial condition or in overall market, economic and political conditions.

•

Senior Loan Risk: the risk of investing in senior loans, which may be greater than the risk of investing in other types of securities, as a result of, among other factors, less readily available, reliable information about most senior loans than is the case for many other types of securities; possible loss of significant value before a default occurs; possible decline in value or illiquidity of collateral; and lack of an active trading market for certain senior loans.

•

Second Lien Loan Risk: the risk of investing in second lien loans, which generally are subject to similar risks as those associated with investments in senior loans as well as the additional risk that the cash flow of the borrower and property securing the loan or debt, if any, may be insufficient to meet scheduled payments after giving effect to the senior secured obligations of the borrower.

•

Mezzanine Securities Risk: the risk of investing in mezzanine securities, which generally are rated below investment grade or are unrated and present many of the same risks as senior loans, second lien loans and non-investment grade bonds. Mezzanine securities present additional risks because they typically are the most subordinated debt obligation in an issuer’s capital structure and are often unsecured. Mezzanine securities are also expected to be a highly illiquid investment.

•

Securities Selection Risk: the risk that the securities held by the Fund may underperform those held by other funds investing in the same asset class or those included in benchmarks that are representative of the same asset class because of the portfolio managers’ choice of securities.

•

Portfolio Management Risk: the risk that an investment strategy may fail to produce the intended results.

Please see “Principal Risks” and “Other Risks” for a more detailed description of the risks of investing in the Fund.

Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity, or person.

Performance Information

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year. The bar chart shows performance of the Fund’s Class M shares. Class M performance is lower than Class I performance because Class I has lower expenses than Class M. The table compares the average annual total returns of the Fund to a

broad-based securities market index. Total returns would have been lower if certain fees and expenses had not been waived or reimbursed. The inception date of Class M shares and Class I shares of the Fund is June 28, 2013. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information for the Fund is available on our website at www.tcw.com or by calling (800) 241-4671.

Floating Rate Income Fund – Class M Shares

Annual Total Returns for Years Ended 12/31

LOGO

Year-to-Date Total Return of Class M Shares as of June 30, 2019: 4.91%


Highest:	2.05%	(quarter ended September 30, 2016)
Lowest:	-2.44%	(quarter ended December 31, 2018)

Average Annual Total Returns

(For Periods Ended December 31, 2018)


Share Class	1 Year		5 Years		Since Inception
M – Before Taxes		0.40%		2.60%		3.07%
- After Taxes on Distributions		-1.25%		1.00%		1.51%
- After Taxes on Distributions and Sale of Fund Shares		0.25%		1.27%		1.65%
I – Before Taxes		0.49%		2.78%		3.25%
S&P/LSTA Leveraged Loan Index		0.44%		3.04%		3.29%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from

those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class M Shares. After-tax returns for other classes will vary. In some cases, returns after taxes on distributions and sale of Fund shares may be higher than returns before taxes because the calculations assume that the investor received a tax deduction for any loss incurred on the sale of the shares.

Investment Adviser

Metropolitan West Asset Management, LLC.

Portfolio Managers


Name	Experience with the Fund	Primary Title with Investment Adviser
Stephen M. Kane, CFA	6 Years	Founding Partner and Generalist Portfolio Manager
Laird Landmann	6 Years	Founding Partner and Generalist Portfolio Manager
Jerry Cudzil	6 Years	Managing Director

Purchase and Sale of Fund Shares

You may purchase or redeem shares of the Funds on any business day (normally any day that the New York Stock Exchange is open). Generally, purchase and redemption orders for shares of the Funds are processed at the net asset value next calculated after an order is received by the Fund. You may conduct transactions by mail (Metropolitan West Funds, c/o BNY Mellon Investment Servicing, P.O. Box 9793, Providence, RI 02940), or by telephone at (800) 241-4671. You may also purchase or redeem shares of the Funds through your dealer or financial advisor. Plan Class shares offered by the Total Return Bond Fund are intended for retirement plans, including defined benefit and defined contribution plans (which may include participant-directed plans).

Purchase Minimums for Each Share Class

The following table provides the minimum initial and subsequent investment requirements for each share class. The minimums may be reduced or waived in some cases. A broker-dealer or other financial intermediary may require a higher minimum initial investment, or may aggregate or combine accounts in order to allow its customers to apply a lower minimum investment.


Share Class and Type of Account	Minimum Initial Investment		Minimum Subsequent Investment
Class M
Regular Accounts	$	5,000	$	0
Individual Retirement Accounts	$	1,000	$	0
Automatic Investment Plan	$	5,000	$	100

Class I
Regular Accounts	$	3,000,000	$	50,000

Administrative Class
Regular Accounts	$	2,500	$	0
Individual Retirement Accounts	$	1,000	$	0

Plan Class
Regular Accounts (Defined Benefit and Defined Contribution Plans)	$	25,000,000	$	50,000

Tax Information

Dividends and capital gains distributions you receive from the Fund are subject to federal income taxes and may also be subject to state and local taxes, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account. Such tax-deferred arrangements may be taxed later upon withdrawal from those arrangements.

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 and/or the Adviser may, directly or through the Fund’s principal underwriter, 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 website for more information. Plan Class shares do not make payments to broker-dealers or other financial intermediaries.