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Institutional Holdings of ALKERMES PLC (ALKS) on 12/31/2011

1. Company Information

Company/StockALKERMES PLC (stock symbol: ALKS)
Funds Ownership128 out of total 3028 funds (4%) own this stock
Funds own total 91,317,821 shares, 70.39% of all outstanding shares
Funds BOUGHT 53,506,244 more shares (+141.51%) in the quarter ended on 12/31/2011

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)WELLINGTON MANAGEMENT CO LLP17,069,952New0.12%13.16%
2.)FMR LLC16,960,050New0.06%13.07%
3.)FEDERATED INVESTORS INC PA 6,474,088New0.58%4.99%
4.)PRICE T ROWE ASSOCIATES INC MD 6,205,614Added 3.73%0.04%4.78%
5.)DEERFIELD MANAGEMENT CO NY5,750,380New5.24%4.43%
6.)VANGUARD GROUP INC4,758,433Added 2.23%0.01%3.67%
7.)BLACKROCK FUND ADVISORS2,960,100New0.03%2.28%
8.)STATE STREET CORP2,847,832Added 8.74%0.01%2.20%
9.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA2,642,619New0.01%2.04%
10.)AMERIPRISE FINANCIAL INC2,224,770Added 7.44%0.03%1.71%
11.)GRANAHAN INVESTMENT MANAGEMENT INC MA2,003,910Cut -7.43%1.32%1.54%
12.)EPOCH INVESTMENT PARTNERS INC1,808,718New0.23%1.39%
13.)TOCQUEVILLE ASSET MANAGEMENT LP1,326,833Cut -5.85%0.24%1.02%
14.)NORTHERN TRUST CORP1,299,112New0.01%1.00%
15.)CLEARBRIDGE ADVISORS LLC1,275,980New0.05%0.98%
16.)BROADFIN CAPITAL LLC1,004,419New8.00%0.77%
17.)DIMENSIONAL FUND ADVISORS INC868,405New0.02%0.67%
18.)BLACKROCK ADVISORS LLC791,532New0.02%0.61%
19.)HAMBRECHT & QUIST CAPITAL MANAGEMENT LLC640,454New2.34%0.49%
20.)LOOMIS SAYLES & CO L P586,844New0.05%0.45%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)BROADFIN CAPITAL LLC1,004,419New8.00%0.77%
2.)DEERFIELD MANAGEMENT CO NY5,750,380New5.24%4.43%
3.)HAMBRECHT & QUIST CAPITAL MANAGEMENT LLC640,454New2.34%0.49%
4.)REXFORD HOLDING MANAGEMENT LLC57,900Added 286.00%2.33%0.04%
5.)REXFORD OFFSHORE L L C15,000Cut -74.09%2.25%0.01%
6.)GRANAHAN INVESTMENT MANAGEMENT INC MA2,003,910Cut -7.43%1.32%1.54%
7.)HATTERAS ALTERNATIVE MUTUAL FUNDS LLC63,796New0.71%0.05%
8.)APEX CAPITAL LLC563,500New0.58%0.43%
9.)FEDERATED INVESTORS INC PA 6,474,088New0.58%4.99%
10.)JP MARVEL INVESTMENT ADVISORS LLC58,820Unchanged0.49%0.05%
11.)NJ STATE EMPLOYEES DEFERRED COMPENSATION PLAN100,000New0.46%0.08%
12.)GUARDIAN INVESTMENT MANAGEMENT14,700Unchanged0.46%0.01%
13.)AMERICAN ASSETS INVESTMENT MANAGEMENT LLC37,000New0.46%0.03%
14.)AUXIER ASSET MANAGEMENT61,351Cut -0.24%0.41%0.05%
15.)KINGDON CAPITAL MANAGEMENT LLC381,200Added 16.68%0.36%0.29%
16.)WAGONHOUND INVESTMENTS LP93,505New0.30%0.07%
17.)GREEN ARROW CAPITAL MANAGEMENT LLC125,000New0.28%0.10%
18.)EMERALD MUTUAL FUND ADVISERS TRUST44,614Cut -73.13%0.25%0.03%
19.)TOCQUEVILLE ASSET MANAGEMENT LP1,326,833Cut -5.85%0.24%1.02%
20.)PASSPORT CAPITAL LLC165,083New0.23%0.13%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)WELLINGTON MANAGEMENT CO LLP17,069,9520.12%13.16%
2.)FMR LLC16,960,0500.06%13.07%
3.)FEDERATED INVESTORS INC PA 6,474,0880.58%4.99%
4.)DEERFIELD MANAGEMENT CO NY5,750,3805.24%4.43%
5.)BLACKROCK FUND ADVISORS2,960,1000.03%2.28%
6.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA2,642,6190.01%2.04%
7.)EPOCH INVESTMENT PARTNERS INC1,808,7180.23%1.39%
8.)NORTHERN TRUST CORP1,299,1120.01%1.00%
9.)CLEARBRIDGE ADVISORS LLC1,275,9800.05%0.98%
10.)BROADFIN CAPITAL LLC1,004,4198.00%0.77%
11.)DIMENSIONAL FUND ADVISORS INC868,4050.02%0.67%
12.)BLACKROCK ADVISORS LLC791,5320.02%0.61%
13.)HAMBRECHT & QUIST CAPITAL MANAGEMENT LLC640,4542.34%0.49%
14.)LOOMIS SAYLES & CO L P586,8440.05%0.45%
15.)APEX CAPITAL LLC563,5000.58%0.43%
16.)TIAA CREF INVESTMENT MANAGEMENT LLC553,3690.01%0.43%
17.)BANK OF NEW YORK MELLON CORP506,3880.00%0.39%
18.)TEACHERS ADVISORS INC428,9840.03%0.33%
19.)DEUTSCHE BANK AG 381,4500.01%0.29%
20.)BANK OF AMERICA CORP DE 302,2320.00%0.23%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)FEDERATED INVESTORS INC PA 6,575,1280.59%5.07%
2.)PASSPORT CAPITAL LLC1,556,9001.54%1.20%
3.)CITADEL ADVISORS LLC1,209,6500.04%0.93%
4.)BROADFIN CAPITAL LLC1,160,1009.23%0.89%
5.)AQR CAPITAL MANAGEMENT LLC868,5120.10%0.67%
6.)APEX CAPITAL LLC593,3000.46%0.46%
7.)DRIEHAUS CAPITAL MANAGEMENT LLC470,1260.39%0.36%
8.)MILLENNIUM MANAGEMENT LLC326,6850.05%0.25%
9.)CITIGROUP INC250,000PUT0.00%0.19%
10.)RENAISSANCE TECHNOLOGIES LLC246,8860.02%0.19%
11.)DIAMONDBACK CAPITAL MANAGEMENT LLC238,0510.15%0.18%
12.)STATE OF NEW JERSEY COMMON PENSION FUND A165,0000.02%0.13%
13.)HIGHBRIDGE CAPITAL MANAGEMENT LLC164,8440.03%0.13%
14.)CR INTRINSIC INVESTORS LLC150,0000.16%0.12%
15.)BBT CAPITAL MANAGEMENT INC150,0000.14%0.12%
16.)J P MORGAN CHASE & CO125,7000.00%0.10%
17.)SIGMA CAPITAL MANAGEMENT LLC114,4340.13%0.09%
18.)PARADIGM ASSET MANAGEMENT CO LLC NY112,4500.36%0.09%
19.)NJ STATE EMPLOYEES DEFERRED COMPENSATION PLAN100,0000.48%0.08%
20.)WEISS MULTI STRATEGY ADVISERS LLC100,0000.05%0.08%