News for 401(k) Plan participants

Select Indexed Equity Fund to become MM S&P 500® Index Fund*

Effective August 24, 2012, MassMutual Select Indexed Equity Fund (Northern Trust), an investment available through your MassMutual retirement plan, will undergo a name change to MM S&P 500 Index Fund (Northern Trust)*. This is a name change only and has no impact on the current value of participant accounts and will not increase the investment option's fees or expenses. The name change is intended to clearly identify the S&P 500 Index as the specific market benchmark that drives the investment approach of the Fund.

Your plan may offer a separate investment account ("SIA") called Select Indexed Equity (Northern Trust) that derives its value by investing in MassMutual Select Indexed Equity Fund (Northern Trust). Following the name change, the SIA will continue to invest in the renamed MM S&P 500 Index Fund (Northern Trust) and the SIA will be renamed MM S&P 500 Index (Northern Trust).

Where can I get more information?

Specific details about this change are available in supplements (dated August 1, 2012) to the MassMutual Select Funds prospectus and summary prospectus (dated April 2, 2012). The supplements, prospectus, and summary prospectus are available on RetireSMARTSM, MassMutual's plan participant Web site, at http://www.retiresmart.com.

Do I need to do anything in response to this update?

No, you do not need to take any action. For more information, Please call 1-800-743-5274 to speak with a MassMutual Retirement Services customer service professional, or visit RetireSMARTSM, MassMutual's plan participant Web site, at http://www.retiresmart.com. Participants can make changes or reaffirm investment selections anytime by logging on to RetireSMARTSM.

*This information may or may not apply to your personal portfolio.

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The Standard & Poor's (S&P 500) Index is a widely recognized, unmanaged index representative of common stocks of larger capitalized U.S. companies. The index does not reflect any deductions for fees or expenses, are unmanaged, and cannot be purchased directly for investment.

"Standard & Poor's®," "S&P®," "Standard & Poor's 500," "500," and "S&P 500®" are trademarks of The McGraw-Hill Companies and have been licensed for use by the Fund. The Fund is not sponsored, endorsed, sold, or promoted by Standard & Poor's, and Standard & Poor's makes no representation regarding the advisability of investing in the Fund.