Biotech Values

[DewDiligence]

MNTA Major Shareholders

[Updated for SEC filings through 2/17/09. Samana Capital
is the only new 13G filer. Officer/director holdings shown
below are as of today and include all options, whether or
not they are currently exercisable. Institutional holdings
shown below are as reported on Form 13G and are
accurate as of 12/31/08.]

 
                        Shares   Stake 
 Novartis             4,708,679  11.8% 
 Visium Asset Mgmt    3,349,122   8.4% 
 T Rowe Price         3,338,081   8.4% 
 Federated Investors  2,824,546   7.1% 
 Samana Capital       2,109,760   5.3% 
 Palo Alto Investors  1,183,658   2.9% 
 Robert Langer*       1,046,022   2.6% 
 Craig Wheeler†         825,000   2.1% 
 Alan Crane‡ (Polaris)  652,602   1.6% 
 G. Venkataraman**      601,812   1.5% 
  
 *Director and co-founder. 
 †Director and CEO. 
 ‡Director and former CEO. 
 **CSO. 
  
 Atlas Venture Fund, which was a 6.7% holder as of 4/1/08, distributed its 
 shares to the limited partners and no longer holds shares in its own name.