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Institutional Holdings of MEMC ELECTRONIC MATERIALS, INC. (WFR) on 3/31/2010

1. Company Information

Company/StockMEMC ELECTRONIC MATERIALS, INC. (stock symbol: WFR)
Funds Ownership284 out of total 2687 funds (11%) own this stock
Funds own total 202,545,408 shares, 90.60% of all outstanding shares
Funds BOUGHT 4,507,737 more shares (+2.28%) in the quarter ended on 3/31/2010

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)FMR LLC27,308,780Cut -9.53%0.06%12.22%
2.)PRICE T ROWE ASSOCIATES INC MD 15,786,814Added 34.70%0.07%7.06%
3.)THORNBURG INVESTMENT MANAGEMENT INC11,909,130Added 223.65%0.67%5.33%
4.)VANGUARD GROUP INC10,916,788Added 3.21%0.02%4.88%
5.)STATE STREET CORP7,528,010Added 3.09%0.02%3.37%
6.)ARTISAN PARTNERS LTD PARTNERSHIP6,990,940Cut -2.15%0.30%3.13%
7.)EPOCH INVESTMENT PARTNERS INC6,183,044Added 39.84%0.66%2.77%
8.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA5,916,454Added 3.62%0.02%2.65%
9.)TIAA CREF INVESTMENT MANAGEMENT LLC4,369,422Added 146.19%0.05%1.95%
10.)BLACKROCK GROUP LTD3,715,608Cut -2.52%0.04%1.66%
11.)WS MANAGEMENT LLP3,712,600CALLAdded 45.59%1.26%1.66%
12.)IG INVESTMENT MANAGEMENT LTD3,708,500Added 0.15%0.18%1.66%
13.)PUTNAM INVESTMENT MANAGEMENT LLC3,048,805Added 5,103.54%0.10%1.36%
14.)FIL LTD2,997,612Added 9.33%0.12%1.34%
15.)INVESCO LTD2,942,976Added 76.44%0.02%1.32%
16.)BLACKROCK FUND ADVISORS2,861,861Cut -5.68%0.02%1.28%
17.)PIEDMONT INVESTMENT ADVISORS LLC2,704,370New0.11%1.21%
18.)NORTHERN TRUST CORP2,667,719Added 7.09%0.02%1.19%
19.)RUSSELL FRANK CO 2,634,087Added 337.54%0.06%1.18%
20.)BANK OF NEW YORK MELLON CORP2,416,866Added 17.43%0.01%1.08%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)STANDARD PACIFIC CAPITAL LLC CA1,530,580Added 127.76%4.32%0.68%
2.)FOYSTON GORDON & PAYNE INC1,294,788Added 35.66%2.91%0.58%
3.)TIGERSHARK PARTNERS LLC800,677Added 212.54%2.64%0.36%
4.)CRITERION CAPITAL MANAGEMENT LLC940,100Added 370.05%2.27%0.42%
5.)SOUND ENERGY PARTNERS INC2,243,624Cut -41.11%2.12%1.00%
6.)SYMONS CAPITAL MANAGEMENT INC455,160Added 112.34%1.97%0.20%
7.)SIVEST GROUP INC319,130New1.86%0.14%
8.)TIGERSHARK PARTNERS LLC400,000PUTNew1.32%0.18%
9.)VAN DEN BERG MANAGEMENT INC TX2,272,056Cut -4.96%1.32%1.02%
10.)WS MANAGEMENT LLP3,712,600CALLAdded 45.59%1.26%1.66%
11.)SIGNIA CAPITAL MANAGEMENT LLC325,636Cut -3.53%1.05%0.15%
12.)SENECA CAPITAL INVESTMENTS LP500,000Cut -23.31%1.02%0.22%
13.)GREENWICH WEALTH MANAGEMENT LLC500,000Unchanged0.96%0.22%
14.)GUINNESS ATKINSON ASSET MANAGEMENT INC115,680Unchanged0.96%0.05%
15.)STEWARDSHIP PARTNERS INVESTMENT COUNSEL INC148,344Cut -0.98%0.93%0.07%
16.)LONESTAR CAPITAL MANAGEMENT LLC600,000New0.85%0.27%
17.)GEOSPHERE CAPITAL MANAGEMENT262,704Cut -34.96%0.85%0.12%
18.)PRENTISS SMITH & CO INC111,150Unchanged0.82%0.05%
19.)WS MANAGEMENT LLP2,404,400Added 11.83%0.82%1.08%
20.)LOGAN CAPITAL MANAGEMENT INC704,682New0.81%0.32%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)PIEDMONT INVESTMENT ADVISORS LLC2,704,3700.11%1.21%
2.)DNB NOR ASSET MANAGEMENT AS2,249,4810.63%1.01%
3.)BAM CAPITAL LLC1,184,200PUT0.38%0.53%
4.)THIRD AVENUE MANAGEMENT LLC1,146,2470.26%0.51%
5.)BAM CAPITAL LLC1,090,2190.35%0.49%
6.)SCHNEIDER CAPITAL MANAGEMENT CORP1,086,4470.71%0.49%
7.)FORTRESS INVESTMENT GROUP LLC722,6000.51%0.32%
8.)LOGAN CAPITAL MANAGEMENT INC704,6820.81%0.32%
9.)WELLINGTON MANAGEMENT CO LLP669,1820.00%0.30%
10.)LONESTAR CAPITAL MANAGEMENT LLC600,0000.85%0.27%
11.)UBS GLOBAL ASSET MANAGEMENT AMERICAS INC404,5290.01%0.18%
12.)TIGERSHARK PARTNERS LLC400,000PUT1.32%0.18%
13.)ADAGE CAPITAL PARTNERS GP LLC322,0000.02%0.14%
14.)SIVEST GROUP INC319,1301.86%0.14%
15.)SIGMA CAPITAL MANAGEMENT LLC260,0000.17%0.12%
16.)BRITISH COLUMBIA INVESTMENT MANAGEMENT CORP244,1310.04%0.11%
17.)BLACK RIVER ASSET MANAGEMENT LLC211,8380.55%0.09%
18.)BASCOM HILL PARTNERS LLC200,0030.34%0.09%
19.)SOUND ENERGY PARTNERS INC200,000CALL0.19%0.09%
20.)BASCOM HILL PARTNERS LLC100,000PUT0.68%0.04%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)FRIESS ASSOCIATES LLC4,807,0400.84%2.15%
2.)DISCOVERY CAPITAL MANAGEMENT LLC CT2,046,6001.79%0.92%
3.)CLAIRVOYANCE CAPITAL ADVISORS PTE LTD1,874,84719.63%0.84%
4.)IVORY INVESTMENT MANAGEMENT LP1,584,7000.85%0.71%
5.)SOROS FUND MANAGEMENT LLC750,0000.13%0.34%
6.)HAWKSHAW CAPITAL MANAGEMENT LLC651,9003.92%0.29%
7.)SYMMETRY PEAK MANAGEMENT LLC600,000CALL2.39%0.27%
8.)CASTLEROCK ASSET MANAGEMENT INC578,1041.49%0.26%
9.)TURNER INVESTMENT PARTNERS INC539,0580.05%0.24%
10.)STELLIAM INVESTMENT MANAGEMENT LP475,0001.60%0.21%
11.)TECHNICAL FINANCIAL SERVICES LLC443,0000.63%0.20%
12.)EAGLE ASSET MANAGEMENT INC421,9090.07%0.19%
13.)SEASONS CAPITAL MANAGEMENT LLC411,4210.42%0.18%
14.)CANYON CAPITAL ADVISORS LLC411,0000.53%0.18%
15.)KINGDON CAPITAL MANAGEMENT LLC400,0000.13%0.18%
16.)DUQUESNE CAPITAL MANAGEMENT L L C394,3000.14%0.18%
17.)DUPONT CAPITAL MANAGEMENT325,7620.11%0.15%
18.)TRELLUS MANAGEMENT COMPANY LLC250,0001.04%0.11%
19.)PERELLA WEINBERG PARTNERS CAPITAL MANAGEMENT LP239,1000.16%0.11%
20.)RANDOLPH CO INC231,8000.72%0.10%