Momenta Pharmaceuticals, Inc. (MNTA)

[DewDiligence]

MNTA Major Shareholders

[Updated for BlackRock 13G filing;
13G filings from other 5% holders are due by 2/14/13.]


The table below shows all shareholders who file their MNTA holdings
on SEC Form 13G; the holdings are updated quarterly from filings on
Form 13F-HR (except Novartis). BlackRock’s holding is as of 12/31/12
and the other table entries are as of 9/30/12 (until new 13G filings are
made in the next 2 weeks).

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 uses a different formula.

 
                            Shares    Stake 
 Scopia Mgmt               5,055,459   9.3% 
 BlackRock Fund Advsrs     4,729,666   8.7% 
 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%  
 Discovery Capital Mgmt    2,307,639   4.3% 
 Palo Alto Investors       1,910,476   3.5%