Putnam Convertible Securities Fund

Before you invest, you may wish to review the fund’s prospectus, which contains more information about the fund and its risks. You may obtain the prospectus and other information about the fund, including the statement of additional information (SAI) and most recent reports to shareholders, at no cost by visiting putnam.com/funddocuments, calling 1-800-225-1581, or e-mailing Putnam at funddocuments@putnam.com.

The fund’s prospectus and SAI, both dated 2/28/11, as supplemented from time to time, are incorporated by reference into this summary prospectus.

Goal

Putnam Convertible Securities Fund seeks, with equal emphasis, current income and capital appreciation. Its secondary objective is conservation of capital.

Fees and expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 14 of the fund’s prospectus and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder fees (fees paid directly from your investment)

		Maximum deferred
	Maximum sales	sales charge (load) (as
	charge (load)	a percentage of original
	imposed on purchases	purchase price or	Redemption fee (as
	(as a percentage of	redemption proceeds,	a percentage of total
Share class	offering price)	whichever is lower)	redemption proceeds)
Class A	5.75%	NONE*	1.00%
Class B	NONE	5.00%**	1.00%
Class C	NONE	1.00%	1.00%
Class M	3.50%	NONE*	1.00%
Class R	NONE	NONE	1.00%
Class Y	NONE	NONE	1.00%

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Annual fund operating expenses
(expenses you pay each year as a percentage of the value of your investment)

		Distribution		Total annual
	Management	and service	Other	fund operating
Share class	fees	(12b-1) fees	expenses	expenses
Class A	0.63%	0.25%	0.30%	1.18%
Class B	0.63%	1.00%	0.30%	1.93%
Class C	0.63%	1.00%	0.30%	1.93%
Class M	0.63%	0.75%	0.30%	1.68%
Class R	0.63%	0.50%	0.30%	1.43%
Class Y	0.63%	N/A	0.30%	0.93%

* A deferred sales charge of 1.00% on class A shares and of 0.65% on class M shares may be imposed on certain redemptions of shares bought without an initial sales charge.

** This charge is phased out over six years.

Example

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

Share class	1 year	3 years	5 years	10 years
Class A	$688	$928	$1,187	$1,924
Class B	$696	$906	$1,242	$2,059
Class B (no redemption)	$196	$606	$1,042	$2,059
Class C	$296	$606	$1,042	$2,254
Class C (no redemption)	$196	$606	$1,042	$2,254
Class M	$515	$861	$1,231	$2,267
Class R	$146	$452	$782	$1,713
Class Y	$95	$296	$515	$1,143

Portfolio turnover

The fund pays transaction-related costs when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 71%.

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Investments, risks, and performance

Investments

We invest mainly in convertible securities of U.S. companies. Convertible securities combine the investment characteristics of bonds and common stocks. Convertible securities include bonds, preferred stocks and other instruments that can be converted into or exchanged for common stock or equivalent value. Many convertible securities are below investment-grade, and a significant portion of the convertible securities we buy are below investment-grade. The convertible bonds we buy usually have intermediate-to long-term stated maturities (three years or longer), but often contain “put” features, which allow bondholders to sell the bond back to the company under specified circumstances, that result in shorter effective maturities. When deciding whether to buy or sell investments, we may consider, among other factors: (i) a security’s structural features, such as its position in a company’s capital structure and “put” and “call” features (a company’s right to repurchase the security under specified circumstances is a “call” feature); (ii) credit and prepayment risks; and (iii) with respect to a company’s common stock underlying a convertible security, the stock’s valuation and the company’s financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends.

Risks

It is important to understand that you can lose money by investing in the fund.

The prices of convertible securities in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including both general financial market conditions and factors related to specific companies or industries. These risks are generally greater for convertible securities issued by small and midsize companies (which may constitute a significant portion of the fund’s investments from time to time). The prices of convertible securities may be adversely affected by changes in the prices of underlying common stocks. Convertible securities tend to provide higher yields than common stocks. However, a higher yield may not protect investors against the risk of loss or adequately mitigate any loss associated with a decline in the price of a convertible security. Convertible securities are subject to credit risk, which is the risk that an issuer of the fund’s investments may default on payment of interest or principal. Credit risk is generally greater for below-investment-grade convertible securities (a significant part of the fund’s investments). Generally, convertible securities may be less sensitive to interest rate changes than non-convertible bonds as a result of convertible securities’ structural features (e.g., convertibility, “put” features, etc.). Interest rate risk is generally greater, however, for longer-term bonds and convertible securities whose underlying stock price has fallen significantly below the conversion price.

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The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.

Average annual total returns after sales charges
(for periods ending 12/31/10)

Share class	1 year	5 years	10 years
Class A before taxes	12.69%	4.92%	5.17%
Class A after taxes on distributions	11.79%	4.07%	4.14%
Class A after taxes on distributions and
sale of fund shares	8.46%	3.79%	3.89%
Class B before taxes	13.65%	5.06%	4.99%
Class C before taxes	17.64%	5.38%	5.00%
Class M before taxes	14.73%	4.90%	4.88%
Class R before taxes	19.19%	5.92%	5.52%
Class Y before taxes	19.79%	6.45%	6.05%
BofA Merrill Lynch All U.S. Convertibles
Index (no deduction for fees, expenses or taxes)	16.77%	5.71%	4.97%

After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.

Class B share performance does not reflect conversion to class A shares.

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Your fund’s management

Investment advisor

Putnam Investment Management, LLC

Portfolio managers

Eric Harthun, Portfolio Manager, portfolio manager of the fund since 2008

Robert Salvin, Portfolio Manager, portfolio manager of the fund since 2005

Purchase and sale of fund shares

You can open an account, purchase and/or sell fund shares, or exchange them for shares of another Putnam fund by contacting your financial advisor or by calling Putnam Investor Services at 1-800-225-1581.

When opening an account, you must complete and mail a Putnam account application, along with a check made payable to the fund, to: Putnam Investor Services, P.O. Box 8383, Boston, MA 02266-8383. The minimum initial investment of $500 is currently waived, although Putnam reserves the right to reject initial investments under $500 at its discretion. There is no minimum for subsequent investments.

You can sell your shares back to the fund or exchange them for shares of another Putnam fund any day the New York Stock Exchange is open. Shares may be sold or exchanged by mail, by phone, or online at putnam.com. Some restrictions may apply.

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Tax information

The fund’s distributions will be taxed as ordinary income or capital gains unless the shares are held through a tax-advantaged arrangement.

Financial intermediary compensation

If you purchase the fund through a broker/dealer or other financial intermediary (such as a bank or financial advisor), the fund and its related companies may pay that intermediary for the sale of fund shares and related services. Please bear in mind that these payments may create a conflict of interest by influencing the broker/dealer or other intermediary to recommend the fund over another investment. Ask your advisor or visit your advisor’s Web site for more information.

Additional information, including current performance, is available at putnam.com/funddocuments, by calling 1-800-225-1581, or by e-mailing Putnam at funddocuments@putnam.com.

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