PIMCO Dynamic Income Fund (PDI) N-CSRSCertified semi-annual shareholder report (management investment company)

We believe that bond funds have an important role to play in a well-diversified investment portfolio. It is important to note, however, that in an environment where interest rates may trend upward, rising rates would negatively impact the performance of most bond funds, and fixed-income securities and other instruments held by a Fund are likely to decrease in value. A wide variety of factors can cause interest rates

or yield of U.S. Treasury securities (or yields of other types of bonds) to rise (e.g., central bank monetary policies, inflation rates, general economic conditions). In addition, changes in interest rates can be sudden and unpredictable, and there is no guarantee that Fund management will anticipate such movement accurately. A Fund may lose money as a result of movement in interest rates.

As of the date of this report, interest rates in the U.S. and many parts of the world, including certain European countries, are near historically low levels. Thus, the Funds currently face a heightened level of risk associated with rising interest rates and/or bond yields. This could be driven by a variety of factors, including but not limited to central bank monetary policies, changing inflation or real growth rates, general economic conditions, increasing bond issuances or reduced market demand for low yielding investments. Further, while bond markets have steadily grown over the past three decades, dealer inventories of corporate bonds are near historic lows in relation to market size. As a result, there has been a significant reduction in the ability of dealers to “make markets.”

Bond funds and individual bonds with a longer duration (a measure used to determine the sensitivity of a security’s price to changes in interest rates) tend to be more sensitive to changes in interest rates, usually making them more volatile than securities or funds with shorter durations. In addition, in the current low interest rate environment, the market price of the Funds’ common shares may be particularly sensitive to changes in interest rates or the perception that there will be a change in interest rates. All of the factors mentioned above, individually or collectively, could lead to increased volatility and/or lower liquidity in the fixed income markets or negatively impact a Fund’s performance or cause a Fund to incur losses.

A Fund may enter into opposite sides of multiple interest rate swaps or other derivatives with respect to the same underlying reference instrument (e.g., a 10-year U.S. treasury) that have different effective dates with respect to interest accrual time periods also for the principal purpose of generating distributable gains (characterized as ordinary income for tax purposes) that are not part of a Fund’s duration or yield curve management strategies. In such a “paired swap transaction”, a Fund would generally enter into one or more interest rate swap agreements whereby a Fund agrees to make regular payments starting at the time a Fund enters into the agreements equal to a floating interest rate in return for payments equal to a fixed interest rate (the

exposure to interest rates, currency exchange rates or other investments. As a result, a relatively small price movement in an asset, instrument or component of the index underlying a derivative instrument may cause an immediate and substantial loss or gain, which translates into heightened volatility in a Fund’s net asset value (“NAV”). A Fund may engage in such transactions regardless of whether the Fund owns the asset, instrument or components of the index underlying the derivative instrument. A Fund may invest a significant portion of its assets in these types of instruments. If it does, a Fund’s investment exposure could far exceed the value of its portfolio securities and its investment performance could be primarily dependent upon securities it does not own.

PIMCO Global StocksPLUS^® & Income Fund’s (“PGP”) monthly distributions are expected to include, among other possible sources, interest income from its debt portfolio and payments and premiums (characterized as capital for financial accounting purposes and as ordinary income for tax purposes) generated by certain types of interest rate derivatives.

Strategies involving interest rate derivatives (including swaps that are paired) may attempt to capitalize on differences between short-term and long-term interest rates as part of PGP’s duration and yield curve active management strategies. For instance, in the event that long-term interest rates are higher than short-term interest rates, the Fund may elect to pay a floating short term interest rate and to receive a long-term fixed interest rate for a stipulated period of time, thereby generating payments as a function of the difference between current short-term interest rates and long-term interest rates, so long as the floating short-term interest rate (which may rise) is lower than the fixed long-term interest rate.

PGP’s index option strategy, to the extent utilized, seeks to generate payments and premiums from writing options that may offset some or all of the capital losses incurred as a result of paired swaps transactions. However, the Fund may use paired swap transactions to support monthly distributions where the index option strategy does not produce an equivalent amount of offsetting gains, including without limitation when such strategy is not being used to a significant extent.

In addition, gains (if any) generated from the index option strategy may be offset by the Fund’s realized capital losses, including any available capital loss carryforwards. PGP currently has significant capital loss carryforwards, some of which will expire at particular dates, and to the extent that the Fund’s capital losses exceed capital gains, the Fund cannot use its capital loss carryforwards to offset capital gains.

The notional exposure of a Fund’s interest rate derivatives may represent a multiple of the Fund’s total net assets. There can be no assurance a

companies representing a small number of industries. Issuers of foreign securities are usually not subject to the same degree of regulation as U.S. issuers.

Reporting, accounting, auditing and custody standards of foreign countries differ, in some cases significantly, from U.S. standards. Also, nationalization, expropriation or other confiscation, currency blockage, political changes or diplomatic developments could adversely affect a Fund’s investments in foreign securities. In the event of nationalization, expropriation or other confiscation, a Fund could lose its entire investment in foreign securities. Investing in foreign (non-U.S.) securities may entail risk due to foreign (non-U.S.) economic and political developments; this risk may be increased when investing in emerging markets. For example, if a Fund invests in emerging market debt, it may face increased exposure to interest rate, liquidity, volatility, and redemption risk due to the specific economic, political, geographical, or legal background of the foreign (non-U.S.) issuer.

Classifications of the Funds’ portfolio holdings in this report are made according to financial reporting standards. The classification of a particular portfolio holding as shown in the Allocation Breakdown and Schedule of Investments or Consolidated Schedule of Investments, as applicable, sections of this report may differ from the classification used for the Funds’ compliance calculations, including those used in the Funds’ prospectus, investment objectives, regulatory, and other investment limitations and policies, which may be based on different asset class, sector or geographical classifications. Each Fund is separately monitored for compliance with respect to prospectus and regulatory requirements.

In June 2019, FNMA and FHLMC started issuing Uniform Mortgage Backed Securities in place of their current offerings of TBA-eligible securities (the “Single Security Initiative”). The Single Security Initiative seeks to support the overall liquidity of the TBA market and aligns the characteristics of FNMA and FHLMC certificates. The effects that the Single Security Initiative may have on the market for TBA and other mortgage-backed securities are uncertain.

Investments in loans through a purchase of a loan or a direct assignment of a financial institution’s interests with respect to a loan are generally subject to risks similar to those of investments in other types of debt obligations, including, among others, credit risk, interest rate risk, variable and floating rate securities risk, and, as applicable, risks associated with mortgage-related securities. In addition, in many cases loans are subject to the risks associated with below-investment grade securities.

In the case of a loan participation or assignment, a Fund generally has no right to enforce compliance with the terms of the loan agreement

the duration of fixed rate mortgage-related assets, making them more

sensitive to changes in interest rates. As a result, in a period of rising interest rates, if a Fund holds mortgage-related securities, it may exhibit additional volatility since individual mortgage holders are less likely to exercise prepayment options, thereby putting additional downward pressure on the value of these securities and potentially causing the Fund to lose money. The Funds’ investments in other asset-backed instruments are subject to risks similar to those associated with mortgage-related assets, as well as additional risks associated with the nature of the assets and the servicing of those assets. Payment of principal and interest on asset-backed securities may be largely dependent upon the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. Additionally, investments in subordinate mortgage-backed and other asset-backed instruments will be subject to risks arising from delinquencies and foreclosures, thereby exposing a Fund’s investment portfolio to potential losses. Subordinate securities of mortgage-backed and other asset-backed instruments are also subject to greater credit risk than those mortgage-backed or other asset-backed securities that are more highly rated.

A Fund may also invest in the residual or equity tranches of mortgage-related and other asset-backed instruments, which may be referred to as subordinate mortgage-backed or asset-backed instruments and interest-only mortgage-backed or asset-backed instruments. Because an investment in the residual or equity tranche of a mortgage-related or other asset-backed instrument will be the first to bear losses incurred by such instrument, these investments may involve a significantly greater degree of risk than investments in other tranches of a mortgage-related or other asset-backed instruments.

The risk of investing in collateralized loan obligations (“CLOs”), include prepayment risk, credit risk, liquidity risk, market risk, structural risk, legal risk and interest rate risk. CLOs may carry additional risks, including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) the possibility that the investments in CLOs are subordinate to other classes or tranches thereof; and (iv) the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results.

High-yield bonds (commonly referred to as “junk bonds”) typically have a lower credit rating than other bonds. Lower-rated bonds generally involve a greater risk to principal than higher-rated bonds. Further, markets for lower-rated bonds are typically less liquid than for higher rated bonds, and public information is usually less abundant in markets for lower-rated bonds. Thus, high yield investments increase the chance that a Fund will lose money. PIMCO does not rely solely on credit

perhaps substantially, and may continue to decline, which may adversely affect the Fund’s NAV.

Variable and floating rate securities may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. Inverse floating rate securities may decrease in value if interest rates increase. Inverse floating rate securities may also exhibit greater price volatility than a fixed rate obligation with similar credit quality. When a Fund holds variable or floating rate securities, a decrease (or, in the case of inverse floating rate securities, an increase) in market interest rates will adversely affect the income received from such securities and the NAV of the Funds’ shares.

Certain Funds may make investments in debt instruments and other securities or instruments directly or through one or more direct or indirect fully-owned subsidiaries formed by the Fund (each, a “Subsidiary”). A Subsidiary may invest, for example, in whole loans or in shares, certificates, notes or other securities representing the right to receive principal and interest payments due on fractions of whole loans or pools of whole loans, or any other security or other instrument that the parent Fund may hold directly. References herein to a Fund include references to a Subsidiary in respect of the Fund’s investment exposure. The allocation of a Fund’s portfolio in a Subsidiary will vary over time and might not always include all of the different types of investments described herein. By investing through its Subsidiaries, a Fund is exposed to the risks associated with the Subsidiaries’ investments. The Subsidiaries are not registered as investment companies under the Investment Company Act of 1940, as amended, and the rules and regulations thereunder (the “Act”) and are not subject to all of the investor protections of the Act, although each Subsidiary is managed pursuant to the compliance policies and procedures of the Fund applicable to it. Changes in the laws of the United States and/or the jurisdiction in which a Subsidiary is organized could result in the inability of certain Funds and/or their Subsidiaries to operate as described in this report and could adversely affect the Funds.

Certain Funds may acquire residential mortgage loans and unsecured consumer loans through a Subsidiary. Subsidiaries directly holding a beneficial interest in loans will be formed as domestic common law or statutory trusts with a federally chartered bank serving as trustee. Each such Subsidiary will hold the beneficial interests of loans and the federally chartered bank acting as trustee will hold legal title to the loans for the benefit of the Subsidiary and/or the trust’s beneficial owners (i.e., a Fund or its Subsidiary). State licensing laws typically exempt federally chartered banks from their licensing requirements, and federally chartered banks may also benefit from federal preemption of state laws, including any licensing requirements. The use of common law or statutory trusts with a federally chartered bank serving as

Beginning in January 2020, global financial markets have experienced and may continue to experience significant volatility resulting from the spread of a novel coronavirus known as COVID-19. The outbreak of COVID-19 has resulted in travel and border restrictions, quarantines, supply chain disruptions, lower consumer demand and general market uncertainty. The effects of COVID-19 have and may continue to adversely affect the global economy, the economies of certain nations and individual issuers, all of which may negatively impact the Funds’ performance. In addition, COVID-19 and governmental responses to COVID-19 may negatively impact the capabilities of the Funds’ service providers and disrupt the Funds’ operations.

The United States’ enforcement of restrictions on U.S. investments in certain issuers and tariffs on goods from other countries, each with a focus on China, has contributed to international trade tensions and may impact portfolio securities.

The United Kingdom’s withdrawal from the European Union may impact Fund returns. The withdrawal may cause substantial volatility in foreign exchange markets, lead to weakness in the exchange rate of the British pound, result in a sustained period of market uncertainty, and destabilize some or all of the other European Union member countries and/or the Eurozone.

The Funds may invest in certain instruments that rely in some fashion upon the London Interbank Offered Rate (“LIBOR”). LIBOR is an average interest rate, determined by the ICE Benchmark Administration, that banks charge one another for the use of short-term money. The United Kingdom’s Financial Conduct Authority, which regulates LIBOR, has announced plans to ultimately phase out the use of LIBOR. There remains uncertainty regarding future utilization of LIBOR and the nature of any replacement rate (e.g., the Secured Overnight Financing Rate, which is intended to replace U.S. dollar LIBOR and measures the cost of overnight borrowings through repurchase agreement transactions collateralized with U.S. Treasury securities). Any potential effects of the transition away from LIBOR on a Fund or on certain instruments in which a Fund invests can be difficult to ascertain, and they may vary depending on a variety of factors. The transition may also result in a reduction in the value of certain instruments held by a Fund or a reduction in the effectiveness of related Fund transactions such as hedges. Any such effects of the transition away from LIBOR, as well as other unforeseen effects, could result in losses to a Fund.

The common shares of the Funds trade on the New York Stock Exchange. As with any stock, the price of a Fund’s common shares will fluctuate with market conditions and other factors. If you sell your common shares of a Fund, the price received may be more or less than your original investment. Shares of closed-end management investment

conditions, supply and demand for the Fund’s shares, or changes in the Fund’s dividends. Performance shown is net of fees and expenses. Historical NAV performance for a Fund may have been positively impacted by fee waivers or expense limitations in place during some or all of the periods shown, if applicable. Future performance (including total return or yield) and distributions may be negatively impacted by the expiration or reduction of any such fee waivers or expense limitations.

The dividend rate that a Fund pays on its common shares may vary as portfolio and market conditions change, and will depend on a number of factors, including without limit the amount of a Fund’s undistributed net investment income and net short- and long-term capital gains, as well as the costs of any leverage obtained by a Fund. As portfolio and market conditions change, the rate of distributions on the common shares and a Fund’s dividend policy could change. There can be no assurance that a change in market conditions or other factors will not result in a change in a Fund distribution rate or that the rate will be sustainable in the future.

The following table discloses the commencement of operations and diversification status of each Fund:

An investment in a Fund is not a deposit of a bank and is not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency. It is possible to lose money on investments in the Funds.

The Trustees/Directors¹ are responsible generally for overseeing the management of the Funds. The Trustees authorize the Funds to enter into service agreements with the Manager and other service providers in order to provide, and in some cases authorize service providers to procure through other parties, necessary or desirable services on behalf of the Funds. Shareholders are not parties to or third-party beneficiaries of such service agreements. Neither a Fund’s original or any subsequent prospectus or Statement of Additional Information (“SAI”), any press release or shareholder report, any contracts filed as exhibits to a Fund’s registration statement, nor any other communications, disclosure documents or regulatory filings from or on behalf of a Fund creates a contract between or among any shareholders of a Fund, on the one hand, and the Fund, a service provider to the Fund, and/or the Trustees or officers of the Fund, on the other hand.

On April 8, 2020, the SEC adopted amended rules modifying the registration, communications, and offering processes for registered closed-end funds and interval funds. Among other things, the amendments will: (1) permit qualifying closed-end funds to use a short-form registration statement to offer securities in eligible transactions and certain funds to qualify as Well Known Seasoned Issuers; (2) permit interval funds to pay registration fees based on net issuance of shares in a manner similar to mutual funds; (3) require closed-end funds and interval funds to include additional disclosures in their annual reports; and (4) require certain information to be filed in interactive data format. The new rules have phased compliance and effective dates, with some requirements already requiring compliance starting from August 1, 2020 and others requiring compliance as late as February 1, 2023.

In October 2020, the SEC adopted a rule related to the use of derivatives, short sales, reverse repurchase agreements and certain other transactions by registered investment companies that rescinds and withdraws the guidance of the SEC and its staff regarding asset segregation and cover transactions. Subject to certain exceptions, and after an eighteen-month transition period, the rule requires funds to trade derivatives and other transactions that create future payment or delivery obligations (except reverse repurchase agreements and similar financing transactions) subject to a value-at-risk leverage limit, certain derivatives risk management program and reporting requirements. These requirements may limit the ability of the Funds to use derivatives and reverse repurchase agreements and similar financing transactions as part of their investment strategies and may increase the cost of the Funds’ investments and cost of doing business, which could adversely affect investors.

In October 2020, the SEC adopted a rule regarding the ability of a fund to invest in other funds. The rule allows a fund to acquire shares of another fund in excess of certain limitations currently imposed by the Act without obtaining individual exemptive relief from the SEC, subject to certain conditions. The rule also included the rescission of certain exemptive relief from the SEC and guidance from the SEC staff for funds to invest in other funds. The impact that these changes may have on the Fund is uncertain.

In December 2020, the SEC adopted a rule addressing fair valuation of fund investments. The new rule sets forth requirements for good faith determinations of fair value as well as for the performance of fair value determinations, including related oversight and reporting obligations. The new rule also defines “readily available market quotations” for purposes of the definition of “value” under the Act, and the SEC noted that this definition will apply in all contexts under the Act. The SEC adopted an 18-month transition period beginning from the effective

Allocation Breakdown as of December 31, 2020^†§

Allocation Breakdown as of December 31, 2020^†§

Allocation Breakdown as of December 31, 2020^†§

Allocation Breakdown as of December 31, 2020^†§

Allocation Breakdown as of December 31, 2020^†§

Allocation Breakdown as of December 31, 2020^†§