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Institutional Holdings of IDENIX PHARMACEUTICALS, INC. (IDIX) on 12/31/2011

1. Company Information

Company/StockIDENIX PHARMACEUTICALS, INC. (stock symbol: IDIX)
Funds Ownership96 out of total 3028 funds (3%) own this stock
Funds own total 68,641,782 shares, 71.50% of all outstanding shares
Funds BOUGHT 12,958,987 more shares (+23.27%) in the quarter ended on 12/31/2011

2. Top 20 Funds Held IDIX in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)BROOKSIDE CAPITAL MANAGEMENT LLC10,987,500Added 15.81%1.96%11.45%
2.)PRICE T ROWE ASSOCIATES INC MD 8,336,002Added 8.61%0.02%8.68%
3.)FMR LLC6,664,079Cut -24.22%0.01%6.94%
4.)BAUPOST GROUP LLC MA5,665,000Added 126.60%1.26%5.90%
5.)VANGUARD GROUP INC3,540,843Added 5.90%0.00%3.69%
6.)MPM ASSET MANAGEMENT LLC3,321,534Unchanged20.93%3.46%
7.)WESTFIELD CAPITAL MANAGEMENT CO LLC2,703,435Added 17.37%0.15%2.82%
8.)BB BIOTECH AG2,482,308Unchanged2.08%2.59%
9.)D E SHAW & CO INC1,952,832Added 524.29%0.04%2.03%
10.)BLACKROCK FUND ADVISORS1,931,903Added 12.10%0.01%2.01%
11.)CITADEL ADVISORS LLC1,767,672Added 36.36%0.03%1.84%
12.)CAPITAL WORLD INVESTORS1,748,200New0.01%1.82%
13.)STATE STREET CORP1,514,830Added 64.49%0.00%1.58%
14.)J P MORGAN CHASE & CO1,447,620Cut -12.69%0.01%1.51%
15.)AMERIPRISE FINANCIAL INC1,183,900Added 112.91%0.01%1.23%
16.)AYER CAPITAL MANAGEMENT LP1,018,700CALLNew7.67%1.06%
17.)SAC CAPITAL ADVISORS LP1,007,181Added 233.70%0.05%1.05%
18.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA957,273Added 27.18%0.00%1.00%
19.)NORTHERN TRUST CORP848,482Added 9.93%0.00%0.88%
20.)JANUS CAPITAL MANAGEMENT LLC799,415New0.01%0.83%



3. Top 20 Funds Held IDIX in this Quarter (By % of Portfolio) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)MPM ASSET MANAGEMENT LLC3,321,534Unchanged20.93%3.46%
2.)AYER CAPITAL MANAGEMENT LP1,018,700CALLNew7.67%1.06%
3.)BB BIOTECH AG2,482,308Unchanged2.08%2.59%
4.)BROOKSIDE CAPITAL MANAGEMENT LLC10,987,500Added 15.81%1.96%11.45%
5.)RA CAPITAL MANAGEMENT LLC300,000New1.34%0.31%
6.)BAUPOST GROUP LLC MA5,665,000Added 126.60%1.26%5.90%
7.)ARIS WEALTH SERVICES INC30,000Unchanged0.67%0.03%
8.)BAILARD BIEHL & KAISER INC205,000Cut -47.44%0.33%0.21%
9.)EUDAIMONIA ASSET MANAGEMENT LLC91,607Cut -12.89%0.32%0.10%
10.)HEALTHCOR MANAGEMENT LP600,000New0.17%0.63%
11.)WESTFIELD CAPITAL MANAGEMENT CO LLC2,703,435Added 17.37%0.15%2.82%
12.)ELLINGTON MANAGEMENT GROUP LLC26,400New0.09%0.03%
13.)OXFORD ASSET MANAGEMENT367,918New0.07%0.38%
14.)TAURUS ASSET MANAGEMENT LLC30,000Unchanged0.07%0.03%
15.)DRIEHAUS CAPITAL MANAGEMENT LLC158,626New0.06%0.17%
16.)LIGHTBOX CAPITAL MANAGEMENT LLC13,398New0.06%0.01%
17.)DEERE & CO77,194New0.05%0.08%
18.)SAC CAPITAL ADVISORS LP1,007,181Added 233.70%0.05%1.05%
19.)DIAMONDBACK CAPITAL MANAGEMENT LLC163,200Cut -43.70%0.05%0.17%
20.)RS INVESTMENT MANAGEMENT CO LLC606,930New0.04%0.63%

4. Top 20 Funds BOUGHT NEW IDIX in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)CAPITAL WORLD INVESTORS1,748,2000.01%1.82%
2.)AYER CAPITAL MANAGEMENT LP1,018,700CALL7.67%1.06%
3.)JANUS CAPITAL MANAGEMENT LLC799,4150.01%0.83%
4.)RS INVESTMENT MANAGEMENT CO LLC606,9300.04%0.63%
5.)HEALTHCOR MANAGEMENT LP600,0000.17%0.63%
6.)TWO SIGMA INVESTMENTS LLC374,0420.03%0.39%
7.)OXFORD ASSET MANAGEMENT367,9180.07%0.38%
8.)RA CAPITAL MANAGEMENT LLC300,0001.34%0.31%
9.)FEDERATED INVESTORS INC PA 192,6000.01%0.20%
10.)DRIEHAUS CAPITAL MANAGEMENT LLC158,6260.06%0.17%
11.)MORGAN STANLEY117,1950.00%0.12%
12.)WEISS GEORGE A100,000CALL0.03%0.10%
13.)WEISS MULTI STRATEGY ADVISERS LLC100,000CALL0.03%0.10%
14.)TWO SIGMA ADVISERS LLC94,2000.04%0.10%
15.)DEERE & CO77,1940.05%0.08%
16.)WEISS GEORGE A67,3420.02%0.07%
17.)MOORE CAPITAL MANAGEMENT LLC62,5000.02%0.07%
18.)TECHNICAL FINANCIAL SERVICES LLC57,0740.02%0.06%
19.)POINTSTATE CAPITAL LP52,0000.03%0.05%
20.)JEFFERIES GROUP INC DE 48,7140.00%0.05%

5. Top 20 Funds SOLD OUT IDIX in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)WALL STREET ASSOCIATES586,6000.28%0.61%
2.)BAKER BROS ADVISORS LLC572,5760.12%0.60%
3.)SIGMA CAPITAL MANAGEMENT LLC490,7520.18%0.51%
4.)BALYASNY ASSET MANAGEMENT LLC100,0000.03%0.10%
5.)CAXTON ASSOCIATES LLC56,9800.01%0.06%
6.)AXA FINANCIAL INC27,8550.00%0.03%
7.)MINTZ HAL21,600PUT0.25%0.02%
8.)WEXFORD CAPITAL LLC21,3550.02%0.02%
9.)LOS ANGELES CAPITAL MANAGEMENT & EQUITY RESEARCH INC1,3000.00%0.00%
10.)CTC FUND MANAGEMENT LLC370.00%0.00%
11.)US BANCORP DE 200.00%0.00%