August 20, 2013

VIA EDGAR

Filing Desk

Securities and Exchange Commission

Office of Filings and Information Services

Branch of Registrations and Examinations

Mail Stop 0-25

100 F Street, NE

Washington, DC 20549

Re: Security Equity Fund (the “Registrant”)

File Nos. 2-19458 and 811-01136

Post-Effective Amendment No. 134 to the Registration Statement on Form N-1A (the “Amendment”)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, the undersigned hereby certifies, on behalf of the Registrant, that the form of the Registrant’s Prospectuses and Statement of Additional Information do not differ from that contained in the Amendment, which was accepted on the EDGAR system on August 14, 2013.

No fees are required in connection with this filing. If you have any questions concerning this filing, please contact me at (785) 438-3226 or Julien Bourgeois of Dechert LLP at (202) 261-3451.

Sincerely,

/s/ Amy J. Lee

Amy J. Lee

Vice President and Secretary

Security Equity Fund