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<p style="margin: 0in; margin-bottom: .0001pt;"><font size="2" style="font-family:times new roman,times"><b>MainStay S&P 500 Index Fund</b></font></p>
<p style="margin: 0in; margin-bottom: .0001pt;"><font size="2" style="font-family:times new roman,times"><b>MainStay 130/30 Core Fund</b></font></p>
<p style="margin: 0in; margin-bottom: .0001pt;"><font size="2" style="font-family:times new roman,times"><b>MainStay International Equity Fund</b></font></p>
<p style="margin: 0in; margin-bottom: .0001pt;"><font size="2" style="font-family:times new roman,times"><b>MainStay Balanced Fund</b></font></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>THE MAINSTAY GROUP OF FUNDS</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Supplement dated January 15, 2013 (“Supplement”)</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">to the following Prospectuses, Summary Prospectuses and Statement of Additional Information </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 Core Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 International Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Common Stock Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay International Equity Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay S&P 500 Index Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectuses and Prospectus, each dated February 28, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented<br /> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Balanced Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectus and Prospectus, each dated May 25, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;">Effective on or about January 25, 2012, Madison Square Investors LLC (“Madison Square Investors”), the Subadvisor to the Funds, will change its name to Cornerstone Capital Management Holdings LLC (“Cornerstone Capital Management”). Accordingly, upon the effective date of Madison Square Investors’ name change, the Summary Prospectuses, Prospectuses, and SAI are revised to reflect that Cornerstone Capital Management is the Funds’ Subadvisor.</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>THE MAINSTAY GROUP OF FUNDS</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Supplement dated January 15, 2013 (“Supplement”)</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">to the following Prospectuses, Summary Prospectuses and Statement of Additional Information</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">  </p>
<p style="font: 10pt/normal times new roman, times, serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 Core Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 International Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Common Stock Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay International Equity Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay S&P 500 Index Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectuses and Prospectus, each dated February 28, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">  </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Balanced Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectus and Prospectus, each dated May 25, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;">Effective on or about January 25, 2012, Madison Square Investors LLC (“Madison Square Investors”), the Subadvisor to the Funds, will change its name to Cornerstone Capital Management Holdings LLC (“Cornerstone Capital Management”). Accordingly, upon the effective date of Madison Square Investors’ name change, the Summary Prospectuses, Prospectuses, and SAI are revised to reflect that Cornerstone Capital Management is the Funds’ Subadvisor.</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>THE MAINSTAY GROUP OF FUNDS</b></p>
<div style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </div>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Supplement dated January 15, 2013 (“Supplement”)</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">to the following Prospectuses, Summary Prospectuses and Statement of Additional Information</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">  </p>
<p style="font: 10pt/normal times new roman, times, serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 Core Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 International Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Common Stock Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay International Equity Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay S&P 500 Index Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectuses and Prospectus, each dated February 28, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Balanced Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectus and Prospectus, each dated May 25, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><br /> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;">Effective on or about January 25, 2012, Madison Square Investors LLC (“Madison Square Investors”), the Subadvisor to the Funds, will change its name to Cornerstone Capital Management Holdings LLC (“Cornerstone Capital Management”). Accordingly, upon the effective date of Madison Square Investors’ name change, the Summary Prospectuses, Prospectuses, and SAI are revised to reflect that Cornerstone Capital Management is the Funds’ Subadvisor.</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>THE MAINSTAY GROUP OF FUNDS</b></p>
<div style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </div>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Supplement dated January 15, 2013 (“Supplement”)</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">to the following Prospectuses, Summary Prospectuses and Statement of Additional Information<br /> </p>
<p style="font: 10pt/normal times new roman, times, serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 Core Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay 130/30 International Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Common Stock Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay International Equity Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay S&P 500 Index Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectuses and Prospectus, each dated February 28, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><b>MainStay Balanced Fund</b></p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Summary Prospectus and Prospectus, each dated May 25, 2012, as supplemented, and</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">Statement of Additional Information, dated February 28, 2012, as amended December 17, 2012,</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;">and as supplemented</p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: center; font-size-adjust: none; font-stretch: normal;"><br /> </p>
<p style="font: 10pt/normal times new roman, times, serif; margin: 0pt 0px; text-align: justify; font-size-adjust: none; font-stretch: normal;">Effective on or about January 25, 2012, Madison Square Investors LLC (“Madison Square Investors”), the Subadvisor to the Funds, will change its name to Cornerstone Capital Management Holdings LLC (“Cornerstone Capital Management”). Accordingly, upon the effective date of Madison Square Investors’ name change, the Summary Prospectuses, Prospectuses, and SAI are revised to reflect that Cornerstone Capital Management is the Funds’ Subadvisor.</p>
<p style="font: 10pt times new roman, times, serif; margin: 0pt 0; text-align: center;"><b>PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.</b></p>
<p style="font: 10pt times new roman, times, serif; margin: 0pt 0; text-align: center;"><b>PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.</b></p>
<p style="font: 10pt times new roman, times, serif; margin: 0pt 0; text-align: center;"><b>PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.</b></p>
<p style="font: 10pt times new roman, times, serif; margin: 0pt 0; text-align: center;"><b>PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.</b></p>