X0303 4 2011-04-13 0 0000885074 AUTHENTIDATE HOLDING CORP ADAT 0001232118 LAZARUS INVESTMENT PARTNERS LLLP 2401 EAST SECOND AVENUE SUITE 600 DENVER CO 80206 0 0 1 0 Common Stock 2011-04-13 4 P 0 383869 0.992 A 6221160 D Common Stock 2011-04-14 4 P 0 150000 1.1298 A 6371160 D The reported securities are owned directly by Lazarus Investment Partners LLLP, and indirectly by Lazarus Management Company LLC, as investment adviser and general partner of Lazarus Investment Partners LLLP, and Justin B. Borus, as managing member of Lazarus Management Company LLC. Lazarus Management Company LLC and Justin B. Borus disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein. This report is filed jointly by Lazarus Investment Partners LLLP, Lazarus Management Company LLC and Justin B. Borus, all of whom may be deemed 10% owners. /s/ Justin B. Borus, Managing member of general partner 2011-04-15