THIRD ROCK VENTURES, LLC Information

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

Report Date: 09/30/2015

Position Statistics

Total Positions 5
New Positions 1
Increased Positions 1
Decreased Positions 2
Positions with Activity 3
Sold Out Positions 0
Total Mkt Value (in $ millions) 658

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

5 Positions as of 09/30/2015

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
GLOBAL BLOOD THERAPEUTICS INC COM 297,727 297,727 New 14,760,900
SAGE THERAPEUTICS INC COM 242,834 -87,824 (26.56) 6,442,916
BLUEPRINT MEDICINES CORP COM 112,227 New 7,393,059
ELEVEN BIOTHERAPEUTICS INC COM 4,203 New 4,841,591
ZAFGEN INC COM 1,340 -19,057 (93.43) 210,371