BAKER BROS ADVISORS LLC Information

667 MADISON AVE, NEW YORK, New York, 10065, (212) 339-5600

Report Date: 03/31/2013

Position Statistics:

Total Positions 67
New Positions 8
Increased Positions 20
Decreased Positions 16
Positions with Activity 36
Sold Out Positions 5
Total Mkt Value
(in $ millions)
3,888

Sector Weighting

Basic Materials
Capital Goods
Conglomerates 0.09%
Consumer Cyclical
Consumer/Non-Cyclical
Energy
Financial
Healthcare 99.91%
Services
Technology
Transportation
Utilities

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

67 Positions as of 03/31/2013

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
ACADIA PHARMACEUTICALS COM 209,645 New 15,621,812
ACHILLION PHARMACEUTICALS INC COM 3,522 3,522 New 455,000
AEGERION PHARMACEUTICALS INC COM 50,313 14,519 40.56 863,743
AMICUS THERAPEUTICS INC COM 1,782 -865 (32.68) 515,072
ANACOR PHARMACEUTICALS INC COM 4,263 New 776,463
ARADIGM CORP COM NEW 15 New 100,000
ARIAD PHARMACEUTICALS INC COM 39,625 386 .98 2,150,000
ARQULE INC COM 2,467 -1,041 (29.68) 910,267
ARRAY BIOPHARMA INC COM 8,700 New 1,500,000
AUXILIUM PHARMACEUTICALS INC COM 32,135 -34,481 (51.76) 2,108,617
AVEO PHARMACEUTICALS INC COM 1,383 1,383 New 519,833
BIOCRYST PHARMACEUTICALS COM 9,347 New 5,563,615
BIODEL INC COM NEW 1,955 New 540,000
BIODELIVERY SCIENCES INTL INC COM 7,201 -1,785 (19.86) 1,714,505
BIOMARIN PHARMACEUTICAL INC COM 51,346 38,208 290.81 783,311
CERUS CORP COM 34,285 23,231 210.16 6,542,845
CHELSEA THERAPEUTICS INTL LTD COM 8,787 3,199 57.23 4,775,787
CHEMOCENTRYX INC COM 676 New 50,000
CLOVIS ONCOLOGY INC COM 33,329 -3,796 (10.22) 1,001,163
CUBIST PHARMACEUTICALS INC COM 281 New 5,000

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