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Institutional Holdings of F5 NETWORKS, INC. (FFIV) on 3/31/2010

1. Company Information

Company/StockF5 NETWORKS, INC. (stock symbol: FFIV)
Funds Ownership307 out of total 2687 funds (11%) own this stock
Funds own total 75,978,118 shares, 96.03% of all outstanding shares
Funds BOUGHT 1,058,525 more shares (+1.41%) in the quarter ended on 3/31/2010

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)FMR LLC6,223,340Added 4.08%0.10%7.87%
2.)TURNER INVESTMENT PARTNERS INC3,333,191Cut -5.47%1.57%4.21%
3.)COATUE MANAGEMENT LLC3,193,401Cut -1.33%11.46%4.04%
4.)AMERICAN CENTURY COMPANIES INC3,003,380Added 1.07%0.46%3.80%
5.)VANGUARD GROUP INC2,859,410Cut -2.99%0.04%3.61%
6.)WELLS FARGO & CO MN2,837,817Added 78.33%0.16%3.59%
7.)COLUMBUS CIRCLE INVESTORS2,687,505Cut -7.76%1.57%3.40%
8.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA2,298,506Cut -26.90%0.05%2.91%
9.)STATE STREET CORP1,879,877Added 15.03%0.03%2.38%
10.)BANK OF NEW YORK MELLON CORP1,795,931Added 19.17%0.07%2.27%
11.)RCM CAPITAL MANAGEMENT LLC1,786,345Cut -3.96%0.77%2.26%
12.)BLACKROCK FUND ADVISORS1,720,259Cut -9.83%0.08%2.17%
13.)AMERIPRISE FINANCIAL INC1,602,267Added 170.76%0.10%2.03%
14.)BLACKROCK ADVISORS LLC1,317,400Added 15.37%0.16%1.67%
15.)CALAMOS ADVISORS LLC1,256,786Cut -6.70%0.42%1.59%
16.)J P MORGAN CHASE & CO1,209,178Added 11.75%0.05%1.53%
17.)US BANCORP DE 1,200,890Cut -7.46%0.16%1.52%
18.)RAINIER INVESTMENT MANAGEMENT INC 1,133,180Added 110.29%0.52%1.43%
19.)COLUMBIA WANGER ASSET MANAGEMENT LP1,128,000Cut -0.18%0.44%1.43%
20.)FIRST TRUST ADVISORS LP1,065,810Added 2.10%1.22%1.35%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)COATUE MANAGEMENT LLC3,193,401Cut -1.33%11.46%4.04%
2.)NORTHCOAST ASSET MANAGEMENT LLC229,036Cut -14.44%6.55%0.29%
3.)NAKOMA CAPITAL MANAGEMENT LLC50,700Cut -29.19%3.73%0.06%
4.)ITHAKA GROUP LLC72,655New3.48%0.09%
5.)BENNETT LAWRENCE MANAGEMENT L L C NY253,740Added 62.11%3.42%0.32%
6.)JMP ASSET MANAGEMENT LLC175,549Added 11.36%3.07%0.22%
7.)7X7 ASSET MANAGEMENT LLC150,000New3.07%0.19%
8.)CRITERION CAPITAL MANAGEMENT LLC176,000Added 252.00%2.95%0.22%
9.)INTREPID CAPITAL MANAGEMENT INC DE 50,000New2.92%0.06%
10.)MITCHELL CAPITAL MANAGEMENT CO52,830Cut -6.30%2.66%0.07%
11.)DSM CAPITAL PARTNERS LLC924,663Added 2,279.17%2.63%1.17%
12.)ZEVENBERGEN CAPITAL INVESTMENTS LLC732,716Added 27.89%2.61%0.93%
13.)APEX CAPITAL MANAGEMENT211,855Cut -2.25%2.36%0.27%
14.)NAVELLIER & ASSOCIATES INC635,110New2.14%0.80%
15.)SOUTH STREET ADVISORS LLC34,020New2.02%0.04%
16.)SUMMIT CREEK ADVISORS LLC6,280Cut -41.03%1.98%0.01%
17.)GENEVA INVESTMENT MANAGEMENT OF CHICAGO LLC473,036Added 48.49%1.95%0.60%
18.)CASTLEARK MANAGEMENT LLC463,624Added 34.67%1.76%0.59%
19.)ORIGIN ASSET MANAGEMENT LLP341,715Cut -21.23%1.71%0.43%
20.)TURNER INVESTMENT PARTNERS INC3,333,191Cut -5.47%1.57%4.21%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)WELLINGTON MANAGEMENT CO LLP721,1250.02%0.91%
2.)NAVELLIER & ASSOCIATES INC635,1102.14%0.80%
3.)UBS GLOBAL ASSET MANAGEMENT AMERICAS INC316,4060.04%0.40%
4.)GREAT WEST LIFE ASSURANCE CO CAN 158,3660.10%0.20%
5.)7X7 ASSET MANAGEMENT LLC150,0003.07%0.19%
6.)NORTHERN TRUST CO OF CONNECTICUT144,2520.10%0.18%
7.)CARLSON CAPITAL L P143,9000.22%0.18%
8.)PARTNER FUND MANAGEMENT LP140,5480.99%0.18%
9.)ALYDAR PARTNERS LLC80,0000.33%0.10%
10.)DNB NOR ASSET MANAGEMENT AS74,0210.14%0.09%
11.)ITHAKA GROUP LLC72,6553.48%0.09%
12.)IG INVESTMENT MANAGEMENT LTD69,3000.02%0.09%
13.)MITSUBISHI UFJ TRUST & BANKING CORP68,4750.03%0.09%
14.)APG ALL PENSIONS GROUP66,0600.02%0.08%
15.)SUMITOMO TRUST & BANKING CO LTD FI65,9930.04%0.08%
16.)LOOMIS SAYLES & CO L P57,000PUT0.04%0.07%
17.)TEACHER RETIREMENT SYSTEM OF TEXAS55,6890.02%0.07%
18.)BALYASNY ASSET MANAGEMENT LLC50,0000.24%0.06%
19.)AVESTA CAPITAL ADVISORS LLC50,0000.77%0.06%
20.)INTREPID CAPITAL MANAGEMENT INC DE 50,0002.92%0.06%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)KINGDON CAPITAL MANAGEMENT LLC600,000PUT0.79%0.76%
2.)JAT CAPITAL MANAGEMENT LP473,4673.35%0.60%
3.)BAKER AVENUE ASSET MANAGEMENT LP292,9462.58%0.37%
4.)CAVALRY MANAGEMENT GROUP LLC222,5521.58%0.28%
5.)STATE OF NEW JERSEY COMMON PENSION FUND A200,0000.07%0.25%
6.)UNITED SERVICES AUTOMOBILE ASSOCIATION148,5520.06%0.19%
7.)HUNTER GLOBAL INVESTORS L P123,0000.53%0.16%
8.)INSIGHT CAPITAL RESEARCH & MANAGEMENT INC117,0581.09%0.15%
9.)DRIEHAUS CAPITAL MANAGEMENT LLC93,9480.25%0.12%
10.)VIRGINIA RETIREMENT SYSTEMS ET AL60,4000.10%0.08%
11.)BASCOM HILL PARTNERS LLC50,000PUT0.44%0.06%
12.)JEFFERIES GROUP INC DE 44,000PUT0.07%0.06%
13.)SG AMERICAS SECURITIES LLC43,800CALL0.00%0.06%
14.)SSI INVESTMENT MANAGEMENT INC43,7450.29%0.06%
15.)PROSPECTOR PARTNERS LLC40,000CALL0.13%0.05%
16.)BERKOWITZ CAPITAL & CO LLC30,0003.13%0.04%
17.)BRIDGEWATER ASSOCIATES INC25,1730.04%0.03%
18.)ING GROEP NV24,8110.03%0.03%
19.)BAIRD ROBERT W & CO INC WI 23,8110.05%0.03%
20.)HUSIC CAPITAL MANAGEMENT21,2901.13%0.03%