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Institutional Holdings of TENARIS SA (TS) on 12/31/2011

1. Company Information

Company/StockTENARIS SA (stock symbol: TS)
Funds Ownership154 out of total 3028 funds (5%) own this stock
Funds own total 133,784,312 shares, 22.66% of all outstanding shares
Funds SOLD -1,390,129 shares (-1.03%) in the quarter ended on 12/31/2011

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)ABERDEEN ASSET MANAGEMENT PLC UK54,112,167Added 3.68%7.65%9.17%
2.)CAPITAL WORLD INVESTORS15,442,518Cut -19.67%0.22%2.62%
3.)WENTWORTH HAUSER & VIOLICH11,383,362Cut -6.06%3.81%1.93%
4.)J P MORGAN CHASE & CO8,677,501Added 12.52%0.15%1.47%
5.)OPPENHEIMER FUNDS INC8,417,162Cut -0.26%0.58%1.43%
6.)PRICE T ROWE ASSOCIATES INC MD 5,507,093Cut -4.37%0.07%0.93%
7.)WESTWOOD GLOBAL INVESTMENTS LLC3,933,691Added 11.41%13.23%0.67%
8.)BANK OF NEW YORK MELLON CORP3,166,308Added 2.08%0.05%0.54%
9.)FRANKLIN RESOURCES INC1,955,930Added 2.13%0.05%0.33%
10.)AGF FUNDS INC1,949,483Added 7.96%1.42%0.33%
11.)CITADEL ADVISORS LLC1,946,999Added 6,958.95%0.16%0.33%
12.)CAPITAL INTERNATIONAL INC CA 1,826,000Added 57.77%1.33%0.31%
13.)INVESCO LTD1,295,446Added 0.76%0.03%0.22%
14.)BLACKROCK ADVISORS LLC1,046,620Added 0.31%0.04%0.18%
15.)VAN ECK ASSOCIATES CORP945,330Added 13,071.66%0.17%0.16%
16.)CAPITAL INTERNATIONAL S A904,600Added 43.45%1.84%0.15%
17.)MASSACHUSETTS FINANCIAL SERVICES CO MA 578,208Added 23.73%0.02%0.10%
18.)FISHER ASSET MANAGEMENT LLC546,455Added 2.96%0.06%0.09%
19.)ARTISAN PARTNERS LIMITED PARTNERSHIP542,362Added 13.77%0.07%0.09%
20.)CLOUGH CAPITAL PARTNERS L P469,349New0.49%0.08%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)WESTWOOD GLOBAL INVESTMENTS LLC3,933,691Added 11.41%13.23%0.67%
2.)ABERDEEN ASSET MANAGEMENT PLC UK54,112,167Added 3.68%7.65%9.17%
3.)WENTWORTH HAUSER & VIOLICH11,383,362Cut -6.06%3.81%1.93%
4.)SAUGATUCK ENERGY LLC85,000New3.14%0.01%
5.)GEOSPHERE CAPITAL MANAGEMENT108,530New2.16%0.02%
6.)CAPITAL INTERNATIONAL S A904,600Added 43.45%1.84%0.15%
7.)SIR CAPITAL MANAGEMENT LP265,500New1.77%0.04%
8.)AGF FUNDS INC1,949,483Added 7.96%1.42%0.33%
9.)VOLLERO BEACH CAPITAL PARTNERS LLC128,044New1.33%0.02%
10.)CAPITAL INTERNATIONAL INC CA 1,826,000Added 57.77%1.33%0.31%
11.)DE BURLO GROUP INC63,300Cut -3.06%0.92%0.01%
12.)COPIA CAPITAL LLC34,270New0.61%0.01%
13.)OPPENHEIMER FUNDS INC8,417,162Cut -0.26%0.58%1.43%
14.)DRIEHAUS CAPITAL MANAGEMENT LLC292,317New0.55%0.05%
15.)ICON ADVISERS INC CO182,500New0.54%0.03%
16.)BOSTON COMMON ASSET MANAGEMENT LLC113,179Cut -10.55%0.53%0.02%
17.)CLOUGH CAPITAL PARTNERS L P469,349New0.49%0.08%
18.)ROC CAPITAL MANAGEMENT LP5,572New0.46%0.00%
19.)AXIOM INTERNATIONAL INVESTORS LLC DE317Added 4.62%0.33%0.00%
20.)GLOBAL X MANAGEMENT CO LLC21,581Cut -22.01%0.24%0.00%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)CLOUGH CAPITAL PARTNERS L P469,3490.49%0.08%
2.)WELLINGTON MANAGEMENT CO LLP401,1500.01%0.07%
3.)DRIEHAUS CAPITAL MANAGEMENT LLC292,3170.55%0.05%
4.)PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO271,4710.05%0.05%
5.)SIR CAPITAL MANAGEMENT LP265,5001.77%0.04%
6.)ICON ADVISERS INC CO182,5000.54%0.03%
7.)VOLLERO BEACH CAPITAL PARTNERS LLC128,0441.33%0.02%
8.)GEOSPHERE CAPITAL MANAGEMENT108,5302.16%0.02%
9.)SAUGATUCK ENERGY LLC85,0003.14%0.01%
10.)D E SHAW & CO INC37,200CALL0.00%0.01%
11.)COPIA CAPITAL LLC34,2700.61%0.01%
12.)ZACKS INVESTMENT MANAGEMENT24,4800.07%0.00%
13.)EULAV ASSET MANAGEMENT22,0000.05%0.00%
14.)CATAPULT CAPITAL MANAGEMENT LLC15,9480.09%0.00%
15.)VINIK ASSET MANAGEMENT L P15,5270.01%0.00%
16.)SVENSON SCOTT13,0200.11%0.00%
17.)PLACEMARK INVESTMENTS INC12,5230.02%0.00%
18.)SPRINGBOK CAPITAL MANAGEMENT LLC8,5360.13%0.00%
19.)HARTWELL J M LIMITED PARTNERSHIP8,2600.08%0.00%
20.)LAIRD NORTON TYEE TRUST CO8,0200.15%0.00%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)RENAISSANCE TECHNOLOGIES LLC1,631,5000.18%0.28%
2.)TEMPUS QUO CAPITAL MANAGEMENT LLC127,6501.02%0.02%
3.)SANTA FE PARTNERS LLC112,7020.47%0.02%
4.)SOUND ENERGY PARTNERS INC100,0000.30%0.02%
5.)ARROWSTREET CAPITAL LIMITED PARTNERSHIP94,8740.03%0.02%
6.)TCW GROUP INC89,4700.01%0.02%
7.)MANAGED ACCOUNT ADVISORS LLC71,0870.00%0.01%
8.)ING INVESTMENT MANAGEMENT (EUROPE) BV70,0000.02%0.01%
9.)SPOT TRADING LLC61,100CALL0.02%0.01%
10.)CAMBIAR INVESTORS LLC54,2630.02%0.01%
11.)FIRST NEW YORK SECURITIES LLC NY50,7310.43%0.01%
12.)AXA FINANCIAL INC50,0000.01%0.01%
13.)TWO SIGMA INVESTMENTS LLC43,1210.02%0.01%
14.)QUANTITATIVE INVESTMENT MANAGEMENT LLC40,8000.07%0.01%
15.)JEFFERIES GROUP INC DE 34,5800.01%0.01%
16.)S&CO INC32,5000.17%0.01%
17.)MACQUARIE GROUP LTD24,8870.00%0.00%
18.)ALTIMA PARTNERS LLP20,0002.09%0.00%
19.)SPOT TRADING LLC18,200PUT0.01%0.00%
20.)CITIGROUP INC18,000CALL0.00%0.00%