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Institutional Holdings of PLAINS EXPLORATION & PRODUCTION CO. L.P. (PXP) on 12/31/2011

1. Company Information

Company/StockPLAINS EXPLORATION & PRODUCTION CO. L.P. (stock symbol: PXP)
Funds Ownership296 out of total 3028 funds (10%) own this stock
Funds own total 112,771,147 shares, 79.98% of all outstanding shares
Funds SOLD -7,631,163 shares (-6.34%) in the quarter ended on 12/31/2011

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)MACKENZIE FINANCIAL CORP8,130,000Cut -1.81%1.33%5.77%
2.)VANGUARD GROUP INC5,939,440Added 2.51%0.04%4.21%
3.)RAINIER INVESTMENT MANAGEMENT INC 4,976,420Added 7.19%1.25%3.53%
4.)STATE STREET CORP4,037,019Added 2.06%0.03%2.86%
5.)BANK OF NEW YORK MELLON CORP3,821,760Added 27.32%0.06%2.71%
6.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA3,715,627Added 6.81%0.04%2.64%
7.)BLACKROCK ADVISORS LLC3,372,170Cut -5.61%0.14%2.39%
8.)SAC CAPITAL ADVISORS LP3,358,090Cut -36.02%0.78%2.38%
9.)BLACKROCK FUND ADVISORS3,019,876Added 4.01%0.06%2.14%
10.)DIMENSIONAL FUND ADVISORS INC2,689,290Added 10.23%0.13%1.91%
11.)FMR LLC2,654,141Added 43.77%0.02%1.88%
12.)GOLDMAN SACHS GROUP INC2,515,471Added 162.48%0.05%1.78%
13.)PERKINS INVESTMENT MANAGEMENT LLC2,246,805Cut -40.63%0.52%1.59%
14.)THIRD POINT LLC2,100,000New3.09%1.49%
15.)PACIFIC HEIGHTS ASSET MANAGEMENT LLC2,000,000Unchanged1.46%1.42%
16.)SAMLYN CAPITAL LLC1,963,383New2.30%1.39%
17.)WESTWOOD MANAGEMENT CORP TX1,929,211Cut -8.49%0.69%1.37%
18.)D E SHAW & CO INC1,859,218Cut -32.64%0.19%1.32%
19.)KLINGENSTEIN FIELDS & CO LLC1,856,703Cut -1.22%3.14%1.32%
20.)ADDISON CLARK MANAGEMENT LLC1,629,898Cut -16.62%7.06%1.16%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)SECTOR OMEGA ASA32,300Unchanged8.72%0.02%
2.)ADAR INVESTMENT MANAGEMENT LLC466,674Added 10.19%7.52%0.33%
3.)BIJOU CAPITAL MANAGEMENT LP9,804New7.38%0.01%
4.)ADDISON CLARK MANAGEMENT LLC1,629,898Cut -16.62%7.06%1.16%
5.)KNIGHTSBRIDGE ASSET MANAGEMENT LLC1,238,325Cut -34.22%5.58%0.88%
6.)CLOVIS CAPITAL MANAGEMENT LP880,000Cut -7.37%5.17%0.62%
7.)NEW GENERATION ADVISERS INC311,558Unchanged4.69%0.22%
8.)MSDC MANAGEMENT LP1,461,075New4.26%1.04%
9.)WESTPORT ASSET MANAGEMENT INC427,005Cut -18.49%4.15%0.30%
10.)WESTPORT ADVISERS LLC980,827Unchanged3.62%0.70%
11.)HARVEY CAPITAL MANAGEMENT INC119,403Added 141.71%3.41%0.08%
12.)KLINGENSTEIN FIELDS & CO LLC1,856,703Cut -1.22%3.14%1.32%
13.)NEW MOUNTAIN VANTAGE ADVISERS LLC1,317,014Cut -10.87%3.12%0.93%
14.)THIRD POINT LLC2,100,000New3.09%1.49%
15.)SCOPIA MANAGEMENT INC1,347,224Added 18.48%2.77%0.96%
16.)KARAMAAN GROUP LLC40,000New2.40%0.03%
17.)SAMLYN CAPITAL LLC1,963,383New2.30%1.39%
18.)HOURGLASS CAPITAL LLC248,200Added 48.98%2.30%0.18%
19.)GERRY FARBER LLC65,000New2.30%0.05%
20.)BECK MACK & OLIVER LLC1,372,104Cut -2.23%1.84%0.97%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)THIRD POINT LLC2,100,0003.09%1.49%
2.)SAMLYN CAPITAL LLC1,963,3832.30%1.39%
3.)MSDC MANAGEMENT LP1,461,0754.26%1.04%
4.)PINEBRIDGE INVESTMENTS LTD905,2181.10%0.64%
5.)KINGDON CAPITAL MANAGEMENT LLC525,0001.03%0.37%
6.)ALYESKA INVESTMENT GROUP LP275,000CALL0.28%0.20%
7.)ALYESKA INVESTMENT GROUP LP275,000PUT0.28%0.20%
8.)WEISS MULTI STRATEGY ADVISERS LLC221,8000.27%0.16%
9.)WEISS GEORGE A221,8000.27%0.16%
10.)JANUS CAPITAL MANAGEMENT LLC211,6910.01%0.15%
11.)MARSHALL WACE NORTH AMERICA LP196,1081.29%0.14%
12.)SIGMA CAPITAL MANAGEMENT LLC172,2000.46%0.12%
13.)CHANNING CAPITAL MANAGEMENT LLC168,5390.74%0.12%
14.)ALTA ADVISERS LTD167,7070.87%0.12%
15.)VOLLERO BEACH CAPITAL PARTNERS LLC163,4901.68%0.12%
16.)MADISON SQUARE INVESTORS LLC106,8830.04%0.08%
17.)TWO SIGMA INVESTMENTS LLC90,9440.04%0.06%
18.)JACOBS LEVY EQUITY MANAGEMENT INC85,6400.05%0.06%
19.)ZURCHER KANTONALBANK (ZURICH CANTONALBANK)79,2520.13%0.06%
20.)GERRY FARBER LLC65,0002.30%0.05%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)RELATIONAL INVESTORS LLC5,727,7033.58%4.06%
2.)BBT CAPITAL MANAGEMENT INC652,5340.88%0.46%
3.)AXA FINANCIAL INC610,2420.09%0.43%
4.)MITCHELL GROUP INC590,9972.75%0.42%
5.)JANUS CAPITAL MANAGEMENT LLC373,7910.01%0.27%
6.)TIMBER HILL LLC334,700PUT0.02%0.24%
7.)CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM316,9530.02%0.22%
8.)HIGHBRIDGE CAPITAL MANAGEMENT LLC303,2740.07%0.22%
9.)HBK INVESTMENTS L P290,5500.15%0.21%
10.)TIMBER HILL LLC235,600CALL0.01%0.17%
11.)BLACKTHORN INVESTMENT GROUP LLC228,2541.52%0.16%
12.)ANTHION MANAGEMENT LLC211,8891.22%0.15%
13.)PEAK6 INVESTMENTS LP188,5420.02%0.13%
14.)BLACK RIVER ASSET MANAGEMENT LLC146,7000.85%0.10%
15.)SOUND ENERGY PARTNERS INC110,2000.30%0.08%
16.)CAPSTONE INVESTMENT ADVISORS LLC92,900CALL0.03%0.07%
17.)ING INVESTMENT MANAGEMENT (EUROPE) BV81,0000.02%0.06%
18.)WOLVERINE ASSET MANAGEMENT LLC76,2300.04%0.05%
19.)VALINOR MANAGEMENT LLC75,000CALL0.10%0.05%
20.)DIAMONDBACK CAPITAL MANAGEMENT LLC58,1000.05%0.04%