X0202 4 2005-07-15 0 0001235010 MOMENTA PHARMACEUTICALS INC MNTA 0001294276 Sasisekharan Ram C/O MOMENTA PHARMACEUTICALS, INC. 675 WEST KENDALL STREET CAMBRIDGE MA 02142 1 0 0 0 Common Stock 2005-07-15 4 S 0 2800 23 D 855544 D Common Stock 2005-07-15 4 S 0 500 23.01 D 855044 D Common Stock 2005-07-15 4 S 0 300 23.03 D 854744 D Common Stock 2005-07-15 4 S 0 400 23.05 D 854344 D Common Stock 2005-07-15 4 S 0 1000 23.2 D 853344 D Common Stock 2005-07-15 4 S 0 400 23.28 D 852944 D Common Stock 2005-07-15 4 S 0 900 23.3 D 852044 D Common Stock 2005-07-15 4 S 0 950 23.31 D 851094 D Common Stock 2005-07-15 4 S 0 750 23.35 D 850344 D Common Stock 2005-07-15 4 S 0 1095 23.4 D 849249 D Common Stock 2005-07-15 4 S 0 2905 23.5 D 846344 D Common Stock 2005-07-15 4 S 0 500 23.73 D 845844 D Common Stock 2005-07-15 4 S 0 200 23.75 D 845644 D Common Stock 2005-07-15 4 S 0 3250 23.8 D 842394 D Common Stock 2005-07-15 4 S 0 50 23.85 D 842344 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2005. /s/ Ram Sasisekharan 2005-07-19