X0202 4 2005-07-20 0 0001235010 MOMENTA PHARMACEUTICALS INC MNTA 0001219015 CLARKE JOHN K C/O CARDINAL PARTNERS 221 NASSAU STREET PRINCETON NJ 08542 1 0 0 0 Common Stock 2005-07-20 4 J 0 7197 A 79497 D Common Stock 2005-07-20 4 J 0 1693450 D 476836 I See Footnote Shares acquired represent a pro-rata distribution in kind without consideration received to Mr. Clarke from CHP II, L.P., the General Partner of CHP II, L.P. The disposition represents a pro-rata distribution in kind without consideration to the partners of CHP II, L.P. The remaining undistributed shares are owned directly by CHP II, L.P. Mr. Clarke is a managing member of CHP II Management LLC, the general partner of CHP II, L.P. Mr. Clarke disclaims beneficial ownership of such shares except to the extent of his respective proportionate pecuniary interest. /s/ John K. Clarke 2005-07-21