EX.99.906CERT


         CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT


Peter B. Doyle, President, and Leonid Polyakov, Treasurer, of each of Kinetics
Mutual Funds, Inc. and Kinetics Portfolio Trust (each, the "Registrant"), each
certify to the best of his knowledge that:

1.   The Registrant's periodic report on Form N-CSR for the period ended June
     30, 2004 (the "Form N-CSR") fully complies with the requirements of section
     15(d) of the Securities Exchange Act of 1934, as amended; and

2.   The information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.




 /s/ Peter B. Doyle                                          /s/ Leonid Polyakov
- ----------------------------------                          -------------------------------
Peter B. Doyle                                              Leonid Polyakov
President, Kinetics Mutual Funds, Inc. & Kinetics           Treasurer, Kinetics Mutual Funds, Inc. & Kinetics
Portfolios Trust                                            Portfolios Trust


Dated: September 8, 2004


This certification is being furnished to the Securities and Exchange Commission
pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended,
and 18 U.S.C. Section 1350 and is not being filed as part of the Form N-CSR with
the Securities and Exchange Commission.