X0202 4 2006-09-29 0001019787 PURADYN FILTER TECHNOLOGIES INC PFTI 0001137521 GLENHILL ADVISORS LLC 598 MADISON AVENUE, 12TH FLOOR NEW YORK NY 10022 0 0 1 0 0001159120 KREVLIN GLENN J GLENHILL ADVISORS, LLC 598 MADISON AVENUE, 12TH FLOOR NEW YORK NY 10022 0 0 1 0 Common Stock 2006-09-29 4 P 0 357142 .70 A 3773808 I See Footnote The reporting person, Glenn J. Krevlin, is the managing member of Glenhill Advisors, LLC, a limited liability company that has investment control and owns a minority interest in various private investment funds, including Glenhill Capital LP and Glenhill Capital Overseas Master Fund, LP, which collectively own the reported securities. Mr. Krevlin disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. Glenhill Capital, LP purchased 250,071 and Glenhill Capital Overseas Master Fund, LP purchased 107,071 of the securities reported in this Form 4. /s/ Glenn J. Krevlin 2006-10-03 /s/ Glenn J. Krevlin, Managing Member, Glenhill Advisors, LLC 2006-10-03