Shareholder Breakdown
  Holders Values ($) % O/S Shares
Institution 194 1,477,267,670.00 76.40 61,069,354
Mutual Fund 375 884,019,465.00 45.72 36,544,831

Institutional Shareholder Rotation
  Holders Values Change ($) % O/S Shares Change
Buyers 86 232,031,442.00 35.73 9,592,040
Sellers 78 -128,875,154.00 36.30 -5,327,621
Net -- 103,156,288.00 -0.57 4,264,419

Institutional Shareholder Concentration
  Values ($) % O/S Shares
Top 10 Inst. 1,000,332,190 51.74 41,353,129
Top 20 Inst. 1,182,214,576.00 61.14 48,872,037
Top 50 Inst. 1,354,290,793.00 70.04 55,985,564
Total Inst. 1,477,267,670.00 76.40 61,069,354

Institutional Shareholder Style
  Holders Values ($) % O/S Shares
Value 79 494,564,500 33.48 20,444,998
GARP 74 179,909,665 12.18 7,437,357
Growth 27 516,663,544 34.97 21,358,559
Index 9 216,920,171 14.68 8,967,349
Deep Value 3 69,193,825 4.68 2,860,431
Yield 2 15,965 0.00 660

Top Holders: Institutional Investor
  Shares Held % O/S Shares Change Filing Date
Fidelity Management & Research 9,332,250 11.70 3,250,053 06/30/2010
Wellington Management Co. LLP 8,699,051 10.91 3,171,283 06/30/2010
T. Rowe Price Associates, Inc. 7,576,320 9.50 -250,820 06/30/2010
BlackRock Fund Advisors 4,162,702 5.22 -1,234,825 06/30/2010
Vanguard Group, Inc. 2,801,796 3.51 -79,099 06/30/2010
Icahn Associates Corp. 2,444,081 3.07 0 06/30/2010
OppenheimerFunds, Inc. 1,859,464 2.33 -127,070 06/30/2010
Pinnacle Associates Ltd. 1,702,096 2.13 66,445 06/30/2010
QVT Financial LP 1,416,513 1.78 -72,794 06/30/2010
State Street Global Advisors 1,358,856 1.70 -946,688 06/30/2010
Granahan Investment Management, Inc. 1,067,950 1.34 -1,750 06/30/2010
AllianceBernstein LP 911,377 1.14 -78,589 06/30/2010
ClearBridge Advisors LLC 882,804 1.11 -116,971 06/30/2010
Neuberger Berman LLC 878,354 1.10 170 06/30/2010
Allianz Global Investors Capital LLC 754,793 0.95 -17,300 06/30/2010
Eagle Asset Management, Inc. 752,583 0.94 12,869 06/30/2010
Goldman Sachs & Co. 719,217 0.90 689,905 06/30/2010

Ownership data is provided by FactSet, a third party service, and Regeneron Pharmaceuticals, Inc. does not maintain or provide information directly to this service.

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NASDAQ:REGN
$23.28   + 0.80
Sep 2, 2010
11:32 AM ET
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