Item 1. Report to Stockholders:
The following is a copy of the report transmitted to stockholders pursuant to Rule 30e-1 under the Investment Company Act of 1940:

Putnam Municipal
Opportunities
Trust

Semiannual report
10 | 31 | 10

Message from the Trustees

Dear Fellow Shareholder:

Stock markets around the world rallied strongly over the past few months, riding a rising tide of strengthening investor confidence and slowly improving economic and corporate data. Indeed, U.S. stocks delivered their best September in 71 years, and continued to add to those gains in October. Bond markets also have generated positive results for much of 2010 and continue to be a source of refuge for risk-averse investors.

It is important to recognize, however, that we may see periods of heightened market volatility as markets and economies seek more solid ground. The slow pace of the U.S. economic recovery and ongoing European sovereign debt concerns have made markets more susceptible to disappointing news. We believe, however, that Putnam’s research-intensive, actively managed investment approach is well suited for this environment.

In developments affecting oversight of your fund, Barbara M. Baumann has been elected to the Board of Trustees of the Putnam Funds, effective July 1, 2010. Ms. Baumann is president and owner of Cross Creek Energy Corporation of Denver, Colorado, a strategic consultant to domestic energy firms and direct investor in energy assets. We also want to thank Elizabeth T. Kennan, who has retired from the Board of Trustees, for her many years of dedicated and thoughtful leadership.

Lastly, we would like to take this opportunity to welcome new shareholders to the fund and to thank all of our investors for your continued confidence in Putnam.

About the fund

Potential for income exempt from federal income tax

Investing in municipal bonds through a fund such as Putnam Municipal Opportunities Trust can help address a significant challenge: taxes on your investment income. While the stated yields on municipal bonds are usually lower than those of taxable bonds, the income most of these bonds pay has the advantage of being exempt from federal tax.

Municipal bonds are typically issued by states and local municipalities to raise funds for building and maintaining public facilities. The bonds are backed by the issuing city or town, by revenues collected from usage fees, or by state tax revenues. Depending on the type of backing, the bonds will have varying degrees of credit risk, which is the risk that the issuer will not be able to repay the bond.

Many municipal bonds are not rated by independent rating agencies such as Standard & Poor’s and Moody’s. This is primarily because many issuers decide not to pursue a rating that might be below investment grade. As a result, portfolio managers must do additional research to determine whether these bonds are prudent investments.

Once the fund has invested in a bond, the portfolio managers continue to monitor developments that affect the overall bond market, the sector, and the issuer of the bond.

The goal of this in-depth research and active management is to stay a step ahead of the industry and pinpoint opportunities for investors.

Consider these risks before investing: Lower-rated bonds may offer higher yields in return for more risk. Funds that invest in bonds are subject to certain risks including interest-rate risk, credit risk, and inflation risk. As interest rates rise, the prices of bonds fall. Long-term bonds are more exposed to interest-rate risk than short-term bonds. Unlike bonds, bond funds have ongoing fees and expenses. The fund’s shares trade on a stock exchange at market prices, which may be lower than the fund’s net asset value.

How do closed-end funds differ from open-end funds?

More assets at work While open-end funds need to maintain a cash position to meet redemptions, closed-end funds are not subject to redemptions and can keep more of their assets invested in the market.

Traded like stocks Closed-end fund shares are traded on stock exchanges, and their market prices fluctuate in response to supply and demand, among other factors.

Net asset value vs. market price Like an open-end fund’s net asset value (NAV) per share, the NAV of a closed-end fund share is equal to the current value of the fund’s assets, minus its liabilities, divided by the number of shares outstanding. However, when buying or selling closed-end fund shares, the price you pay or receive is the market price. Market price reflects current market supply and demand and may be higher or lower than the NAV.

Data is historical. Past performance does not guarantee future results. More recent returns may be less or more than those shown. Investment return and net asset value will fluctuate, and you may have a gain or a loss when you sell your shares. Performance assumes reinvestment of distributions and does not account for taxes. Fund returns in the bar chart are at NAV. See pages 5 and 10–11 for additional performance information, including fund returns at market price. Index and Lipper results should be compared with fund performance at NAV. Lipper calculates performance differently than the closed-end funds it ranks, due to varying methods for determining a fund’s monthly reinvestment NAV.

* Returns for the six-month period are not annualized, but cumulative.

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Interview with your fund’s portfolio manager

Thalia Meehan

How did the fund and the municipal bond market perform for the semiannual period, Thalia?

For the six months ended October 31, 2010, Putnam Municipal Opportunities Trust advanced 7.09% at net asset value, topping the 3.95% return for its benchmark, the Barclays Capital Municipal Bond Index. The fund also outperformed the 6.42% average return of its peers in the Lipper General Municipal Debt Funds category [leveraged closed-end].

What role did the fund’s use of leverage play in the fund’s performance?

Leverage generally involves borrowing funds and investing the proceeds with the expectation of producing a return that exceeds the cost of borrowing. Unlike open-end funds, closed-end funds are permitted to engage in investment leverage by issuing preferred shares. Your fund has used this form of investment leverage, which offers opportunities for increased investment yield, while also effectively amplifying the common shareholders’ exposure to the effects of both investment losses and investment gains. To the extent your fund can invest the assets attributable to leverage in securities with greater return than the cost of leverage, the use of leverage should benefit your fund’s common shareholders.

Due to Federal Reserve actions that have reduced short-term borrowing costs to historical lows, and due to generally favorable municipal bond market conditions over recent periods, preferred share leverage has been generally advantageous to your fund’s common shareholders over recent periods. We will continue to monitor the overall impact of preferred share leverage on your fund’s portfolio.

This comparison shows your fund’s performance in the context of broad market indexes for the six months ended 10/31/10. See pages 4 and 10–11 for additional fund performance information. Index descriptions can be found on page 12.

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What was the market environment like during the reporting period?

The past six months represented a continuation of the themes that have been present in the market throughout 2010. Investors continued to allocate money away from cash and other safe assets into longer-term and higher-risk investments, while strong demand from yield-hungry investors pushed bond prices higher in the more credit-sensitive sectors of the municipal bond market.

The period was not without patches of volatility, as investors expressed concerns over the growing European debt crisis and fears that it might derail the global economic recovery. Investors were also uncertain about the inevitable withdrawal of stimulus funds around the globe, and how this process would affect growth. Those concerns subsided somewhat by the summer, as the European debt markets stabilized and the Federal Reserve Board again suggested that its easing policies would continue for an extended period. On the whole, the past six months were fairly solid for municipal bonds after a choppy start to the calendar year.

What other factors influenced the municipal bond market during the period?

Build America Bonds — or “BABs” — continued to have a significant impact on the municipal bond market. The program began in early 2009 as part of the federal government’s stimulus package and allows states and municipalities to issue bonds in the taxable market, providing them with access to a wider range of investors. The federal government in turn subsidizes a portion of the interest payments, currently 35%. As of October 31, nearly $90 billion worth of BABs were issued in 2010.

Credit qualities are shown as a percentage of portfolio value as of 10/31/10. A bond rated Baa or higher (MIG3/VMIG3 or higher, for short-term debt) is considered investment grade. The chart reflects Moody’s ratings; percentages may include bonds or derivatives not rated by Moody’s but rated by Standard & Poor’s or, if unrated by S&P, by Fitch, and then included in the closest equivalent Moody’s rating. Ratings will vary over time. Credit qualities are included for portfolio securities and are not included for derivative instruments and cash. The fund itself has not been rated by an independent rating agency.

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Overall, the plan has been successful in lowering financing costs for states, and has also benefited municipal bond investors by reducing the supply of tax-exempt bonds in the market, which has led to improved supply and demand dynamics. Congress is currently considering extending the program with a slightly lower subsidy, although, as of this writing, it’s unclear whether such an extension will be acted upon by the lame-duck Congress.

We also think that the health-care reform legislation should be a modest positive for the tax-exempt bond market, because it contains a 3.8% tax on capital gains, unearned interest, and dividends for individuals with income over $200,000 or households with income over $250,000. Municipal bond income would not be subject to the tax, and any tax increase improves the attractiveness of tax-exempt funds. Ultimately, we believe investors’ tax burden is likely to head higher, and that should make municipal bonds’ tax-exempt income even more attractive.

Turning back to the fund, which market segments drove performance during the semiannual period?

The biggest driver of performance was the fund’s overweight position in A- and BBB-rated securities. Early in 2009, municipal bonds across the board looked extremely undervalued by historical standards, with wider spreads occurring in the lower-rated

Top ten state allocations are shown as a percentage of the fund’s portfolio value as of 10/31/10. Investments in Puerto Rico represented 4.7% of net assets. Holdings will vary over time.

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segments of the market. We targeted those opportunities by increasing the fund’s exposure to BBB-rated securities throughout 2009 and continued to do so more selectively in 2010. This generally helped performance during the period. As the market recovered, the fund’s position in tobacco bonds rallied sharply, placing them among the top contributors in 2009. In 2010, we began reducing our exposure to tobacco bonds for two reasons: first, to lock in their strong performance, and second, because we felt their fundamentals had become somewhat less attractive. That said, tobacco bond spreads — which measure the sector’s excess yield over similar U.S. Treasuries — are currently wider than average, and we believe certain opportunities still exist within the sector.

The fund’s investments in California and Puerto Rico municipal bonds also helped fund performance, as those areas of the market performed well over the past several months. In general, however, we’ve been limiting the fund’s exposure to general obligation [G.O.] bonds, particularly those issued by local municipalities such as cities and counties, as negative headlines and potential downgrades by ratings agencies could put pressure on bond prices. Instead, we’ve been finding better opportunities in revenue bonds, which are secured by cash flows tied to specific projects. The health-care and utilities sectors are two areas of the market where we are overweight, and, in general, our positions helped performance over the period.

What is your outlook for the municipal bond market?

While we believe the U.S. economy will continue recovering, growth could remain muted for some time. The volatility that returned to stock and bond markets this spring, aggravated by growing concerns over

This chart shows how the fund’s top weightings have changed over the past six months. Weightings are shown as a percentage of net assets. Summary information may differ from the portfolio schedule included in the financial statements due to the inclusion of derivative securities and the exclusion of as-of trades, if any, and the use of different classifications of securities for presentation purposes. Holdings will vary over time. Sector concentrations listed after the portfolio schedule in the Financial Statements section of this shareholder report are exclusive of insured status and any interest accruals and may differ from the summary information above.

Data in the chart reflect a new calculation methodology placed in effect within the past six months.

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sovereign debt problems in Europe, appears unlikely to dissipate soon in our view. U.S. unemployment remains persistently high, while consumer and business spending have been sporadic, which has diminished many states’ tax revenues. However, we believe the real risk for most municipal bonds is not default risk, but “headline risk” posed by the ongoing media coverage of state budgetary woes. We believe the financial challenges faced by states like California are significant, but can be dealt with. It’s important for investors to remember that most states pass a balanced budget every year, and although it took a record-setting time to do so, California recently resolved its budget impasse for the current fiscal year.

Overall, supply/demand technicals are supportive of the market, but over the near term, we believe the market will be tested by a likely increase in supply given uncertainty surrounding the BABs extension. We believe investment opportunities continue to exist in certain areas of the market, such as the BBB-rated segment, and, as always, we are monitoring the market closely, and will seek to take advantage of new opportunities as they develop.

Thank you, Thalia, for your time and insights today.

The views expressed in this report are exclusively those of Putnam Management. They are not meant as investment advice.

Please note that the holdings discussed in this report may not have been held by the fund for the entire period. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk.

Portfolio Manager Thalia Meehan is Team Leader of Tax Exempt Fixed Income at Putnam. She holds a B.A. from Williams College. A CFA charterholder, Thalia joined Putnam in 1989 and has been in the investment industry since 1983.

In addition to Thalia, your fund’s portfolio managers are Paul Drury and Susan McCormack.

IN THE NEWS

The Federal Reserve’s “QE2” has set sail. In light of what has been a tepid economic recovery, in October the Fed announced a second round of monetary stimulus via quantitative easing — dubbed QE2 by the media — involving the purchase of an additional $600 billion of U.S. Treasury bonds through the end of June 2011. The Fed has suggested in recent months that it is particularly concerned about the prospect of deflation, which has plagued the Japanese economy for the better part of the past decade. By purchasing Treasuries, the central bank could drive down already low yields by injecting about $75 billion a month into the capital markets. The idea behind QE2 is that the money would then be reinvested, and the expected upward pressure on asset prices could create inflationary expectations sufficient to prevent deflation from becoming a problem.

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Your fund’s performance

This section shows your fund’s performance, price, and distribution information for periods ended October 31, 2010, the end of the first half of its current fiscal year. In accordance with regulatory requirements for mutual funds, we also include performance as of the most recent calendar quarter-end. Performance should always be considered in light of a fund’s investment strategy. Data represents past performance. Past performance does not guarantee future results. More recent returns may be less or more than those shown. Investment return, net asset value, and market price will fluctuate, and you may have a gain or a loss when you sell your shares.

Fund performance Total return for periods ended 10/31/10

Performance assumes reinvestment of distributions and does not account for taxes.

Index and Lipper results should be compared to fund performance at net asset value. Lipper calculates performance differently than the closed-end funds it ranks, due to varying methods for determining a fund’s monthly reinvestment NAV.

* Over the 6-month, 1-year, 3-year, 5-year, 10-year, and life-of-fund periods ended 10/31/10, there were 63, 63, 60, 59, 42, and 33 funds, respectively, in this Lipper category.

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Fund price and distribution information For the six-month period ended 10/31/10

The classification of distributions, if any, is an estimate. Final distribution information will appear on your year-end tax forms.

¹ For some investors, investment income may be subject to the federal alternative minimum tax. Income from federally exempt funds may be subject to state and local taxes.

² Capital gains, if any, are taxable for federal and, in most cases, state purposes.

³ Most recent distribution, excluding capital gains, annualized and divided by NAV or market price at end of period.

⁴ Assumes maximum 35% federal tax rate for 2010. Results for investors subject to lower tax rates would not be as advantageous.

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Terms and definitions

Important terms

Total return shows how the value of the fund’s shares changed over time, assuming you held the shares through the entire period and reinvested all distributions in the fund.

Net asset value (NAV) is the value of all your fund’s assets, minus any liabilities and the net assets allocated to any outstanding preferred shares, divided by the number of outstanding common shares.

Market price is the current trading price of one share of the fund. Market prices are set by transactions between buyers and sellers on exchanges such as the New York Stock Exchange.

Current yield is the annual rate of return earned from dividends or interest of an investment. Current yield is expressed as a percentage of the price of a security, fund share, or principal investment.

Comparative indexes

Barclays Capital Aggregate Bond Index is an unmanaged index of U.S. investment-grade fixed-income securities.

Barclays Capital Municipal Bond Index is an unmanaged index of long-term fixed-rate investment-grade tax-exempt bonds.

BofA (Bank of America) Merrill Lynch U.S. 3-Month Treasury Bill Index is an unmanaged index that seeks to measure the performance of U.S. Treasury bills available in the marketplace.

S&P 500 Index is an unmanaged index of common stock performance.

Indexes assume reinvestment of all distributions and do not account for fees. Securities and performance of a fund and an index will differ. You cannot invest directly in an index.

Lipper is a third-party industry-ranking entity that ranks mutual funds. Its rankings do not reflect sales charges. Lipper rankings are based on total return at net asset value relative to other funds that have similar current investment styles or objectives as determined by Lipper. Lipper may change a fund’s category assignment at its discretion. Lipper category averages reflect performance trends for funds within a category.

Trustee approval of management contract

General conclusions

The Board of Trustees of the Putnam funds oversees the management of each fund and, as required by law, determines annually whether to approve the continuance of your fund’s management contract with Putnam Investment Management (“Putnam Management”) and the sub-management contract with respect to your fund between Putnam Management and its affiliate, Putnam Investments Limited (“PIL”).

In this regard, the Board of Trustees, with the assistance of its Contract Committee consisting solely of Trustees who are not “interested persons” (as this term is defined in the Investment Company Act of 1940, as amended) of the Putnam funds (the “Independent Trustees”), requests and evaluates all information it deems reasonably necessary under the circumstances. Over the course of several months ending in June 2010, the Contract Committee met on a number of occasions with representatives of Putnam Management and in executive

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session to consider the information provided by Putnam Management and other information developed with the assistance of the Board’s independent counsel and independent staff. The Contract Committee reviewed and discussed key aspects of this information with all of the Independent Trustees. At the Trustees’ June 11, 2010 meeting, the Contract Committee recommended, and the Independent Trustees approved, the continuance of your fund’s management and sub-management contracts, effective July 1, 2010. (Because PIL is an affiliate of Putnam Management and Putnam Management remains fully responsible for all services provided by PIL, the Trustees have not evaluated PIL as a separate entity, and all subsequent references to Putnam Management below should be deemed to include reference to PIL as necessary or appropriate in the context.)

The Independent Trustees’ approval was based on the following conclusions:

• That the fee schedule in effect for your fund represented reasonable compensation in light of the nature and quality of the services being provided to the fund, the fees paid by competitive funds, and the costs incurred by Putnam Management in providing such services, and

• That the fee schedule represented an appropriate sharing between fund shareholders and Putnam Management of such economies of scale as may exist in the management of the fund at current asset levels.

These conclusions were based on a comprehensive consideration of all information provided to the Trustees and were not the result of any single factor. Some of the factors that figured particularly in the Trustees’ deliberations and how the Trustees considered these factors are described below, although individual Trustees may have evaluated the information presented differently, giving different weights to various factors. It is also important to recognize that the fee arrangements for your fund and the other Putnam funds are the result of many years of review and discussion between the Independent Trustees and Putnam Management, that certain aspects of the arrangements may receive greater scrutiny in some years than others, and that the Trustees’ conclusions may be based, in part, on their consideration of fee arrangements in prior years.

Management fee schedules and categories; total expenses

The Trustees reviewed the management fee schedules in effect for all Putnam funds, including fee levels and breakpoints. In reviewing management fees, the Trustees generally focus their attention on material changes in circumstances — for example, changes in assets under management or investment style, changes in Putnam Management’s operating costs, or changes in competitive practices in the mutual fund industry — that suggest that consideration of fee changes might be warranted. The Trustees concluded that the circumstances did not warrant changes to the management fee structure of your fund.

The Trustees reviewed comparative fee and expense information for a custom group of competitive funds selected by Lipper Inc. This comparative information included your fund’s percentile ranking for effective management fees and total expenses, which provides a general indication of your fund’s relative standing. In the custom peer group, your fund ranked in the 1st quintile in effective management fees (determined for your fund and the other funds in the custom peer group based on fund asset size and the applicable contractual management fee schedule) and in the 2nd quintile in total expenses as of December 31, 2009 (the first quintile representing the least expensive funds and the fifth quintile the most expensive funds).

Your fund currently has the benefit of breakpoints in its management fee that provide

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shareholders with significant economies of scale in the form of reduced fee levels as the fund’s assets under management increase. In recent years, the Trustees have examined the operation of the existing breakpoint structure during periods of both growth and decline in asset levels. The Trustees concluded that the fee schedule in effect for your fund represented an appropriate sharing of economies of scale at that time.

In connection with their review of the management fees and total expenses of the Putnam funds, the Trustees also reviewed the costs of the services provided and the profits realized by Putnam Management and its affiliates from their contractual relationships with the funds. This information included trends in revenues, expenses and profitability of Putnam Management and its affiliates relating to the investment management, investor servicing and distribution services provided to the funds. In this regard, the Trustees also reviewed an analysis of Putnam Management’s revenues, expenses and profitability, allocated on a fund-by-fund basis, with respect to the funds’ management, distribution, and investor servicing contracts. For each fund, the analysis presented information about revenues, expenses and profitability for each of the agreements separately and for the agreements taken together on a combined basis. The Trustees concluded that, at current asset levels, the fee schedules currently in place represented an appropriate sharing of economies of scale at that time.

The information examined by the Trustees as part of their annual contract review for the Putnam funds has included for many years information regarding fees charged by Putnam Management and its affiliates to institutional clients such as defined benefit pension plans, college endowments, and the like. This information included comparisons of such fees with fees charged to the funds, as well as an assessment of the differences in the services provided to these two types of clients. The Trustees observed, in this regard, that the differences in fee rates between institutional clients and mutual funds are by no means uniform when examined by individual asset sectors, suggesting that differences in the pricing of investment management services to these types of clients may reflect historical competitive forces operating in separate market places. The Trustees considered the fact that fee rates across different asset classes are typically higher on average for mutual funds than for institutional clients, as well as the differences between the services that Putnam Management provides to the Putnam funds and those that it provides to its institutional clients, and did not rely on these comparisons to any significant extent in concluding that the management fees paid by your fund are reasonable.

Investment performance

The quality of the investment process provided by Putnam Management represented a major factor in the Trustees’ evaluation of the quality of services provided by Putnam Management under your fund’s management contract. The Trustees were assisted in their review of the Putnam funds’ investment process and performance by the work of the Investment Oversight Coordinating Committee of the Trustees and the Investment Oversight Committees of the Trustees, which met on a regular basis with the funds’ portfolio teams throughout the year. The Trustees concluded that Putnam Management generally provides a high-quality investment process — based on the experience and skills of the individuals assigned to the management of fund portfolios, the resources made available to them, and in general Putnam Management’s ability to attract and retain high-quality personnel — but also recognized that this does not guarantee favorable investment results for every fund in every time period. The Trustees considered the investment performance of

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each fund over multiple time periods and considered information comparing each fund’s performance with various benchmarks and with the performance of competitive funds.

The Committee noted the substantial improvement in the performance of most Putnam funds during 2009. The Committee also noted the disappointing investment performance of a number of the funds for periods ended December 31, 2009 and considered information provided by Putnam Management regarding the factors contributing to the underperformance and actions being taken to improve performance. The Trustees indicated their intention to continue to monitor performance trends to assess the effectiveness of these efforts and to evaluate whether additional changes to address areas of underperformance are warranted.

In the case of your fund, the Trustees considered that your fund’s common share cumulative total return performance at net asset value was in the following quartiles of its Lipper Inc. peer group (Lipper General Municipal Debt Funds (Leveraged)) for the one-year, three-year and five-year periods ended December 31, 2009 (the first quartile representing the best-performing funds and the fourth quartile the worst-performing funds):

Over the one-year, three-year and five-year periods ended December 31, 2009, there were 57, 57 and 56 funds, respectively, in your fund’s Lipper peer group. (When considering performance information, shareholders should be mindful that past performance is not a guarantee of future results.)

Brokerage and soft-dollar allocations; investor servicing

The Trustees considered various potential benefits that Putnam Management may receive in connection with the services it provides under the management contract with your fund. These include benefits related to brokerage and soft-dollar allocations, whereby a portion of the commissions paid by a fund for brokerage may be used to acquire research services that are expected to be useful to Putnam Management in managing the assets of the fund and of other clients. The Trustees considered a change made, at Putnam Management’s request, to the Putnam funds’ brokerage allocation policies commencing in 2010, which increased the permitted soft dollar allocation to third-party services over what had been authorized in previous years. The Trustees noted that a portion of available soft dollars continues to be allocated to the payment of fund expenses. The Trustees indicated their continued intent to monitor regulatory developments in this area with the assistance of their Brokerage Committee and also indicated their continued intent to monitor the potential benefits associated with fund brokerage and soft-dollar allocations and trends in industry practices to ensure that the principle of seeking best price and execution remains paramount in the portfolio trading process.

Putnam Management may also receive benefits from payments that the funds make to Putnam Management’s affiliates for investor services. In conjunction with the annual review of your fund’s management contract, the Trustees reviewed your fund’s investor servicing agreement with Putnam Fiduciary Trust Company (“PFTC”), an affiliate of Putnam Management. The Trustees concluded that the fees payable by the funds to PFTC for such services are reasonable in relation to the nature and quality of such services.

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Other information for shareholders

Important notice regarding share repurchase program

In September 2010, the Trustees of your fund approved the renewal of a share repurchase program that had been in effect since 2005. This renewal will allow your fund to repurchase, in the 12 months beginning October 8, 2010, up to 10% of the fund’s common shares outstanding as of October 7, 2010.

Important notice regarding delivery of shareholder documents

In accordance with SEC regulations, Putnam sends a single copy of annual and semiannual shareholder reports, prospectuses, and proxy statements to Putnam shareholders who share the same address, unless a shareholder requests otherwise. If you prefer to receive your own copy of these documents, please call Putnam at 1-800-225-1581, and Putnam will begin sending individual copies within 30 days.

Proxy voting

Putnam is committed to managing our mutual funds in the best interests of our shareholders. The Putnam funds’ proxy voting guidelines and procedures, as well as information regarding how your fund voted proxies relating to portfolio securities during the 12-month period ended June 30, 2010, are available in the Individual Investors section of putnam.com, and on the SEC’s Web site, www.sec.gov. If you have questions about finding forms on the SEC’s Web site, you may call the SEC at 1-800-SEC-0330. You may also obtain the Putnam funds’ proxy voting guidelines and procedures at no charge by calling Putnam’s Shareholder Services at 1-800-225-1581.

Fund portfolio holdings

The fund will file a complete schedule of its portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. Shareholders may obtain the fund’s Forms N-Q on the SEC’s Web site at www.sec.gov. In addition, the fund’s Forms N-Q may be reviewed and copied at the SEC’s Public Reference Room in Washington, D.C. You may call the SEC at 1-800-SEC-0330 for information about the SEC’s Web site or the operation of the Public Reference Room.

Trustee and employee fund ownership

Putnam employees and members of the Board of Trustees place their faith, confidence, and, most importantly, investment dollars in Putnam mutual funds. As of October 31, 2010, Putnam employees had approximately $324,000,000 and the Trustees had approximately $68,000,000 invested in Putnam mutual funds. These amounts include investments by the Trustees’ and employees’ immediate family members as well as investments through retirement and deferred compensation plans.

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Financial statements

A guide to financial statements

These sections of the report, as well as the accompanying Notes, constitute the fund’s financial statements.

The fund’s portfolio lists all the fund’s investments and their values as of the last day of the reporting period. Holdings are organized by asset type and industry sector, country, or state to show areas of concentration and diversification.

Statement of assets and liabilities shows how the fund’s net assets and share price are determined. All investment and non-investment assets are added together. Any unpaid expenses and other liabilities are subtracted from this total. The result is divided by the number of shares to determine the net asset value per share. (For funds with preferred shares, the amount subtracted from total assets includes the liquidation preference of preferred shares.)

Statement of operations shows the fund’s net investment gain or loss. This is done by first adding up all the fund’s earnings — from dividends and interest income — and subtracting its operating expenses to determine net investment income (or loss). Then, any net gain or loss the fund realized on the sales of its holdings — as well as any unrealized gains or losses over the period — is added to or subtracted from the net investment result to determine the fund’s net gain or loss for the fiscal period.

Statement of changes in net assets shows how the fund’s net assets were affected by the fund’s net investment gain or loss, by distributions to shareholders, and by changes in the number of the fund’s shares. It lists distributions and their sources (net investment income or realized capital gains) over the current reporting period and the most recent fiscal year-end. The distributions listed here may not match the sources listed in the Statement of operations because the distributions are determined on a tax basis and may be paid in a different period from the one in which they were earned. Dividend sources are estimated at the time of declaration. Actual results may vary. Any non-taxable return of capital cannot be determined until final tax calculations are completed after the end of the fund’s fiscal year.

Financial highlights provide an overview of the fund’s investment results, per-share distributions, expense ratios, net investment income ratios, and portfolio turnover in one summary table, reflecting the five most recent reporting periods. In a semiannual report, the highlights table also includes the current reporting period.

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The fund’s portfolio 10/31/10 (Unaudited)

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Notes to the fund’s portfolio

Unless noted otherwise, the notes to the fund’s portfolio are for the close of the fund’s reporting period, which ran from May 1, 2010 through October 31,2010 (the reporting period).

* Percentages indicated are based on net assets of $532,394,966.

** The Moody’s, Standard & Poor’s or Fitch ratings indicated are believed to be the most recent ratings available at the close of the reporting period for the securities listed. Ratings are generally ascribed to securities at the time of issuance. While the agencies may from time to time revise such ratings, they undertake no obligation to do so, and the ratings do not necessarily represent what the agencies would ascribe to these securities at the close of the reporting period. Securities rated by Putnam are indicated by “/P.” Securities rated by Fitch are indicated by “/F.” The rating of an insured security represents what is believed to be the most recent rating of the insurer’s claims-paying ability available at the close of the reporting period and does not reflect any subsequent changes.

† Non-income-producing security.

†† The interest rate and date shown parenthetically represent the new interest rate to be paid and the date the fund will begin accruing interest at this rate.

^T Underlying security in a tender option bond transaction. The security has been segregated as collateral for financing transactions.

Debt obligations are considered secured unless otherwise indicated.

144A after the name of an issuer represents securities exempt from registration under Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration, normally to qualified institutional buyers.

The rates shown on ARP, FRB, FRN, Mandatory Put Bonds and VRDN are the current interest rates at the close of the reporting period.

The dates shown parenthetically on Mandatory Put Bonds represent the next mandatory put dates.

The dates shown parenthetically on prerefunded bonds represent the next prerefunding dates.

The dates shown on debt obligations are the original maturity dates.

The fund had the following sector concentrations greater than 10% at the close of the reporting period (as a percentage of net assets):

Accounting Standards Codification ASC 820 Fair Value Measurements and Disclosures (ASC 820) establishes a three-level hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of the fund’s investments. The three levels are defined as follows:

Level 1 — Valuations based on quoted prices for identical securities in active markets.

Level 2 — Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

Level 3 — Valuations based on inputs that are unobservable and significant to the fair value measurement.

The following is a summary of the inputs used to value the fund’s net assets as of the close of the reporting period:

The accompanying notes are an integral part of these financial statements.

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