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 annual report of Janus Capital Group Inc. (the "Company")
on Form 10-K for the year ended December 31, 2003 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), I, Mark B. Whiston,
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/ Mark B. Whiston
- --------------------------------------
Mark B. Whiston
Vice Chairman of the Board, President,
Chief Executive Officer and Director


Date: March 9, 2004

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.