Stock Trading History of Ludlum Ken

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 Ludlum Ken since year 2005. The trader's CIK number is 1255825. At the time of this reporting, Ludlum Ken is the Director of Natus Medical Inc (stock ticker symbol BABY).

Stock purchases, sales, and option exercises reported by *Ludlum Ken* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-08-21	BABY	Natus Medical Inc	Purchase	4,000	15.99	63,960
2007-07-10	BABY	Natus Medical Inc	Option Exercise	3,500	11.32	39,620
2007-01-19	BABY	Natus Medical Inc	Option Exercise	4,000	11.32	45,280
2006-08-25	BABY	Natus Medical Inc	Purchase	3,000	13.20	39,585
2006-03-23	BABY	Natus Medical Inc	Option Exercise	10,500	6.74	70,770
2005-06-03	BABY	Natus Medical Inc	Sale	22,500	9.94	223,605

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 Ludlum Ken (Director of Natus Medical Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.