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Institutional Investment Manager
MPM ASSET MANAGEMENT LLC
MPM ASSET MANAGEMENT LLC (CIK: 0001263048) incorporated in Delaware, located at 399 Boylston Street, Suite 1100, Boston, MA. Institutional holdings reported to the SEC.

Institutional Holdings (2015Q1)
Portfolio Summary: 15 holdings with a total value of $468,928,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 RADIUS HEALTH 5,831,253 240,014,000 51.18%
2 PORTOLA PHARMACEUTICALS INC 1,220,672 46,337,000 9.88%
3 EPIZYME INC COM 2,163,819 40,637,000 8.67%
4 ARATANA THERAPEUTICS INC COM 2,118,845 33,923,000 7.23%
5 NEVRO CORP 686,704 32,914,000 7.02%
6 TRIVASCULAR TECHNOLOGIES INC 1,776,692 18,637,000 3.97%
7 CELLADON CORP 800,542 15,162,000 3.23%
8 Proteon Therapeutics 983,381 11,437,000 2.44%
9 PHARMATHENE INC COM 6,347,614 10,347,000 2.21%
10 CONATUS PHARMACEUTICALS INC COM 1,192,080 8,488,000 1.81%
11 VERASTEM INC COM 816,683 8,306,000 1.77%
12 MAST THERAPEUTICS 2,551,851 1,250,000 0.27%
13 ENTEROMEDICS INC 1,113,168 1,024,000 0.22%
14 SANGAMO BIOSCIENCES INCORPORATED 22,487 353,000 0.08%
15 MACROGENICS INC 3,168 99,000 0.02%

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000950123-15-004661, filed 2015.04.27).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.