THIRD ROCK VENTURES, LLC Information

29 NEWBURY STREET, BOSTON, Massachusetts, 02116, (617) 585-2000

Report Date: 03/31/2015

Position Statistics

Total Positions 6
New Positions 0
Increased Positions 0
Decreased Positions 4
Positions with Activity 4
Sold Out Positions 2
Total Mkt Value (in $ millions) 996

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

Sector Weighting

Basic Materials
Capital Goods
Conglomerates
Consumer Cyclical
Consumer/Non-Cyclical
Energy
Financial
Healthcare
Services
Technology
Transportation
Utilities

6 Positions as of 03/31/2015

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
SAGE THERAPEUTICS INC COM 673,462 -131,476 (16.33) 9,773,073
FOUNDATION MEDICINE INC COM 162,007 New 4,927,234
ZAFGEN INC COM 146,903 -48,944 (24.99) 4,202,045
ELEVEN BIOTHERAPEUTICS INC COM 13,895 New 4,841,591
AGIOS PHARMACEUTICALS INC COM -339,061 Sold Out 0
BLUEBIRD BIO INC COM -198,309 Sold Out 0


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