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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 (2015Q3)
Portfolio Summary: 16 holdings with a total value of $650,050,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 RADIUS HEALTH 5,831,253 404,164,000 62.17%
2 CHIASMA INC 5,681,544 112,949,000 17.38%
3 PORTOLA PHARMACEUTICALS INC 1,220,672 52,025,000 8.00%
4 EPIZYME INC COM 1,729,674 22,244,000 3.42%
5 Proteon Therapeutics 983,381 13,679,000 2.10%
6 NEVRO CORP 211,884 9,829,000 1.51%
7 ARATANA THERAPEUTICS INC COM 1,117,875 9,457,000 1.45%
8 TRIVASCULAR TECHNOLOGIES INC 1,776,692 8,883,000 1.37%
9 PHARMATHENE INC COM 6,347,614 8,442,000 1.30%
10 CONATUS PHARMACEUTICALS INC COM 1,192,080 5,305,000 0.82%
11 MAST THERAPEUTICS 2,551,851 1,480,000 0.23%
12 VERASTEM INC COM 572,874 1,025,000 0.16%
13 ENTEROMEDICS INC 1,113,168 289,000 0.04%
14 SANGAMO BIOSCIENCES INCORPORATED 22,487 127,000 0.02%
15 COLUCID PHARMACEUTICALS INC COM 21,806 84,000 0.01%
16 MACROGENICS INC 3,168 68,000 0.01%

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000950123-15-011440, filed 2015.11.12).

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.