Stock Trading History of Pai Surendra

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Pai Surendra since year 2005. The trader's CIK number is 1307703. At the time of this reporting, Pai Surendra is the Chief Executive Officer of Authentidate Holding Corp (stock ticker symbol ADAT).

Stock purchases, sales, and option exercises reported by *Pai Surendra* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-02-13	ADAT	Authentidate Holding Corp	Purchase	6,400	1.41	9,023
2007-02-12	ADAT	Authentidate Holding Corp	Purchase	53,600	1.38	73,968
2006-03-13	ADAT	Authentidate Holding Corp	Purchase	15,000	2.77	41,554
2006-03-15	ADAT	Authentidate Holding Corp	Purchase	15,000	3.00	44,925
2005-11-15	ADAT	Authentidate Holding Corp	Purchase	10,000	2.45	24,500

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Pai Surendra (Chief Executive Officer of Authentidate Holding Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.