X0202 4 2006-05-18 0 0000716646 CLINICAL DATA INC CLDA 0001091823 KIRK RANDAL J 1881 GROVE AVENUE RADFORD VA 24141 1 0 1 0 Common Stock 1056191 D Common Stock 2006-05-18 4 P 0 100000 20.00 A 366246 I by Staff LLC Common Stock 433410 I by Kirkfield Common Stock 579883 I by RJK Common Stock 33091 I by Zhong Mei Common Stock 555162 I by NRM II Common Stock 153356 I by NRM III Common Stock 153353 I by Radford Randal J. Kirk controls each of new River Management III, LP ("NRM III"), Third Security Staff 2001 LLC ("Staff LLC"), Radford Investments Limited Partnership ("Radford"), Kirkfield, L.L.C. ("Kirkfield"), RJK, L.L.C. ("RJK"), Zhong Mei, L.L.C. ("Zhong Mei") and New River Management II, LP ("NRM II"). Shares held by these entities may be deemed to be indirectly beneficially owned (as defined under Rule 13d-3 promulgated under the Securities Exchange Act of 1934, as amended) by Mr. Kirk. /s/ Randal J. Kirk 2006-05-22