Janus Capital (JNS) 10-Q 2010 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of Janus Capital Group Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2010, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Richard M. Weil, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Richard M. Weil

Richard M. Weil

Chief Executive Officer

Date: October 21, 2010

A signed original of this written statement required by Section 906 has been provided to Janus Capital Group Inc. and will be retained by Janus Capital Group Inc. and furnished to the Securities and Exchange Commission or its staff upon request.