Mutual Fund Summary Prospectus (497k)


		Summary Prospectus April 1, 2013

MassMutual Select Funds

MassMutual Select Growth Opportunities Fund

Ticker: Class S–MGRSX, Class Y–MAGYX, Class L–MAGLX, Class A–MMAAX, Class N–MMANX, Class Z–MMAZX

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 and other information about the Fund online at www.massmutual.com/funds. You can also get this information at no cost by calling 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.

INVESTMENT OBJECTIVE

This Fund seeks long-term capital appreciation.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. For Class A shares, you may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in MassMutual funds. More information about these and other discounts is available in the section titled Sales Charges by Class on page 129 of the Fund’s Prospectus or from your financial professional.

Shareholder Fees (fees paid directly from your investment)

Class Z

Class S

Class Y

Class L

Class A

Class N

Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)

None

5.75%

None

Maximum Deferred Sales Charge (Load) (as a % of the lower of the original offering price or redemption proceeds)

None

1.00%

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


	Class Z	Class S	Class Y	Class L	Class A	Class N
Management Fees	.73%	.73%	.73%	.73%	.73%	.73%
Distribution and Service (Rule 12b-1) Fees	None	None	None	None	.25%	.50%
Other Expenses	.12%	.27%	.37%	.52%	.52%	.57%
Total Annual Fund Operating Expenses	.85%	1.00%	1.10%	1.25%	1.50%	1.80%
Fee Waiver	(.15%)	(.15%)	(.15%)	(.15%)	(.15%)	(.15%)
Total Annual Fund Operating Expenses after Fee Waiver ⁽¹⁾	.70%	.85%	.95%	1.10%	1.35%	1.65%

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The expenses in the above table reflect a written agreement by MassMutual to waive .15% of the management fees of the Fund through March 31, 2014. The agreement can only be terminated by mutual consent of the Board of Trustees on behalf of the Fund and MassMutual.

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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. It assumes that you invest $10,000 in each share class of the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. For Class A shares, the example includes the initial sales charge. The example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses are exactly as described in the preceding table. 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 Z	$	72	$	256	$	457	$	1,035
Class S	$	87	$	303	$	538	$	1,211
Class Y	$	97	$	335	$	592	$	1,327
Class L	$	112	$	382	$	672	$	1,498
Class A	$	705	$	1,008	$	1,333	$	2,250
Class N	$	268	$	552	$	961	$	2,104

Except for Class N shares, the figures shown above would be the same whether you sold your shares at the end of a period or kept them. For Class N shares, you would pay the following expenses if you did not redeem your shares:


	1 Year		3 Years		5 Years		10 Years
Class N	$	168	$	552	$	961	$	2,104

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 rate 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 19% of the average value of its portfolio.

INVESTMENTS, RISKS, AND PERFORMANCE

Principal Investment Strategies

This Fund seeks to achieve its objective by investing primarily in equity securities of U.S. companies. Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities. Equity securities may include common stocks, preferred stocks, securities convertible into common or preferred stock, rights, and warrants. The Fund typically invests most of its assets in equity securities of U.S. companies, but may invest up to 20% of its total assets in foreign securities and American Depositary Receipts

(“ADRs”), including emerging market securities. The Fund may hold a portion of its assets in cash or cash equivalents. The Fund is non-diversified, which means that it may hold larger positions in a smaller number of stocks than a diversified Fund.

The Fund is managed by two subadvisers, Sands Capital Management, LLC (“Sands Capital”) and Delaware Management Company (“DMC”), each being responsible for a portion of the portfolio, but not necessarily equally weighted. Sands Capital seeks long-term capital appreciation by investing in stocks believed to have potential for dramatic wealth creation using bottom-up, fundamental research and focusing on six key investment criteria: sustainable, above average earnings growth, a leadership position in a promising business space, significant competitive advantages/unique business franchise, a clear mission and value-added focus, financial strength, and rational valuation relative to the market and business prospects. Sands Capital does not typically invest in companies with market capitalizations less than $1 billion. DMC seeks to select securities that it believes are undervalued in relation to their intrinsic value, as indicated by multiple factors, including the return on capital above its cost of capital. DMC will normally invest in common stocks of companies with market capitalizations of at least $3 billion at the time of purchase. Each subadviser may consider selling a security for the Fund, if, for example, in its judgment, the prospects for future growth do not look promising , a more attractive opportunity is identified, if fundamentals unexpectedly change or if valuations are stretched past fair value.

Principal Risks

The following are the Principal Risks of the Fund. You have the potential to make money by investing in the Fund, but you can also lose money.

Cash Position Risk The ability of the Fund to meet its objective may be limited to the extent that it holds assets in cash or otherwise uninvested.

Convertible Securities Risk Convertible securities are subject to the risks of both debt securities and equity securities. The values of convertible securities tend to decline as interest rates rise and, due to the conversion feature, tend to vary with fluctuations in the market value of the underlying common or preferred stock.

Foreign Investment Risk; Emerging Markets Risk; Currency Risk Foreign securities, including ADRs,

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are subject to additional risks compared to securities of U.S. issuers, including international trade, currency, political, regulatory, and diplomatic risks. In addition, fluctuations in currency exchange rates may adversely affect the values of foreign securities and the price of the Fund’s shares. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, and greater volatility in currency exchange rates.

Growth Company Risk The prices of growth securities are often more sensitive to market fluctuations because of their heavy dependence on future earnings expectations, and can be more volatile than the market in general.

Liquidity Risk Certain securities may be difficult (or impossible) to sell or positions difficult to close out at a desirable time and price, and the Fund may be required to hold an investment that is declining in value or be prevented from realizing capital gains.

Management Risk The Fund relies on the manager’s ability to achieve its investment objective. There can be no assurance that the Fund will achieve the desired results and the Fund may incur significant losses.

Non-Diversification Risk Because the Fund may invest its assets in a more limited number of issuers than a diversified fund, a decline in the market value of a particular security may affect the Fund’s value more than if the Fund were diversified.

Market Risk The value of the Fund’s portfolio securities may decline, at times sharply and unpredictably, as a result of unfavorable market-induced changes affecting particular industries, sectors, or issuers. Stock market prices in general may decline over short or extended periods, subjecting the Fund to unpredictable declines in the value of its shares and poor performance. The Fund is subject to risks affecting issuers, such as management performance, financial leverage, industry problems, and reduced demand for goods or services.

Preferred Stock Risk Preferred stocks are subject to the risks associated with other types of equity securities, as well as additional risks, such as potentially greater volatility and risks related to deferral, non-cumulative dividends, subordination, liquidity, limited voting rights, and special redemption rights.

Smaller and Mid-Cap Company Risk Market risk and liquidity risk are particularly pronounced for securities of smaller companies, which may trade less frequently and in smaller volumes than more widely-held securities, and may fluctuate in price more than other securities. Smaller companies may have limited product lines, markets, or financial resources and may be dependent on a limited management group; they may have been recently organized and have little or no track record of success.

Valuation Risk The Fund is subject to the risk of mispricing or improper valuation of its investments, in particular to the extent that its securities are fair valued.

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 for Class S shares. The table shows how the Fund’s average annual returns for 1, 5, and 10 years (or 1 year and since inception for Class Z shares) compare with those of a broad measure of market performance. Performance for Class A and Class N shares of the Fund reflects any applicable sales charge. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More up-to-date performance information is available at http://www.massmutual.com/funds or by calling 1-888-309-3539.

Annual Performance

Class S Shares

LOGO


Highest Quarter:			1Q ’12,				20.14%			Lowest Quarter:			4Q ’08,			-	27.26%

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 are not relevant to investors who hold Fund shares through tax-deferred arrangements, such as

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401(k) plans or individual retirement accounts. After-tax returns are shown for Class S only. After-tax returns for other classes will vary.

Average Annual Total Returns

(for the periods ended December 31, 2012)


				One Year		Since Inception (12/07/11)
Class Z	Return Before Taxes				20.14%		17.99%
Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)					15.26%		13.12%
		One Year		Five Years		Ten Years
Class S	Return Before Taxes		19.86%		4.87%		9.35%

	Return After Taxes on Distributions		19.86%		4.70%		9.26%

	Return After Taxes on Distributions and Sale of Fund Shares		12.91%		4.10%		8.29%
Class Y	Return Before Taxes		19.84%		4.79%		9.25%
Class L	Return Before Taxes		19.61%		4.65%		9.08%
Class A	Return Before Taxes		12.51%		3.16%		8.15%
Class N	Return Before Taxes		17.87%		4.02%		8.47%
Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)			15.26%		3.12%		7.52%

MANAGEMENT

Investment Adviser: Massachusetts Mutual Life Insurance Company

Subadvisers: Sands Capital Management, LLC

Delaware Management Company

Portfolio Managers:

Frank M. Sands, Jr. , CFA is the Chief Investment Officer and Chief Executive Officer at Sands Capital. He has managed the Fund since January 2004.

Thomas M. Ricketts, CFA is a Senior Research Analyst, Senior Portfolio Manager, and Executive Managing Director at Sands Capital. He has managed the Fund since September 2009.

T. Perry Williams, CFA is a Senior Research Analyst, Senior Portfolio Manager, and Executive Managing Director at Sands Capital. He has managed the Fund since September 2009.

Jeffrey S. Van Harte , CFA is a Senior Vice President and Chief Investment Officer – Focus Growth Equity at DMC. He has managed the Fund since June 2006.

Christopher J. Bonavico , CFA is a Vice President, Senior Portfolio Manager, and Equity Analyst at DMC. He has managed the Fund since June 2006.

Christopher M. Ericksen , CFA is a Vice President, Portfolio Manager, and Equity Analyst at DMC. He has managed the Fund since June 2006.

Daniel J. Prislin , CFA is a Vice President, Senior Portfolio Manager, and Equity Analyst at DMC. He has managed the Fund since June 2006.

PURCHASE AND SALE OF FUND SHARES

Shares of the Fund are generally available to retirement plans, other institutional investors, and individual retirement accounts. Fund shares are redeemable on any business day by written request, telephone or internet (available to certain customers).

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income or capital gains, unless you are an investor eligible for preferential tax treatment.

PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES

If you purchase the Fund through a broker-dealer or other financial intermediary, the intermediary may receive a one-time or continuing payments from the Fund, MassMutual or its affiliates, or others for the sale of Fund shares or continuing shareholder services provided by the intermediary. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary to recommend the Fund over another investment. You should contact your intermediary to obtain more information about the compensation it may receive in connection with your investment.

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