Momenta Pharmaceuticals, Inc. (MNTA)

[DewDiligence]

MNTA Major Shareholders

[Updated for 13G filing by Visium on 12/20/12 and for 3Q12
13F-HR filings from other holders. T Rowe Price, FMR, Blackrock,
and Palo Alto increased their holdings slightly during 3Q12,
while Scopia decreased its holdings slightly.)]


The table below shows all shareholders who filed their MNTA holdings
on SEC Form 13G in Feb 2012 (or later); the holdings are updated quarterly
for filings on Form 13F-HR (except Novartis) and are accurate as of 9/30/12.
The percentages in the table are based on 54.3M diluted shares (#msg-76922372)
and do not concur with the percentages on Form 13G, which use a different formula.

 
                            Shares    Stake 
 Scopia Mgmt               5,055,459   9.3% 
 Novartis                  4,708,679   8.7% 
 T Rowe Price              3,900,824   7.2% 
 Visium Asset Mgmt         3,632,895   6.7% 
 Fidelity (FMR)            2,993,801   5.5%  
 BlackRock Fund Advsrs     2,591,102   4.8% 
 Discovery Capital Mgmt    2,307,639   4.3% 
 Palo Alto Investors       1,910,476   3.5%