| Top Institutional Holders |
|---|
| Holder | Shares | % Out | Value* | Reported |
|---|
| Oracle Investment Management, Inc. | 1,111,442 | 3.93 | 4,323,509 | Mar 31, 2013 | | BlackRock Institutional Trust Company, N.A. | 1,087,916 | 3.84 | 4,231,993 | Mar 31, 2013 | | Vanguard Group, Inc. (The) | 686,682 | 2.43 | 2,671,192 | Mar 31, 2013 | | BlackRock Fund Advisors | 612,669 | 2.16 | 2,383,282 | Mar 31, 2013 | | Artal Group S.A. | 410,130 | 1.45 | 1,595,405 | Mar 31, 2013 | | State Street Corporation | 380,426 | 1.34 | 1,479,857 | Mar 31, 2013 | | Northern Trust Corporation | 307,863 | 1.09 | 1,197,587 | Mar 31, 2013 | | Bruce & Co, Inc. | 233,515 | 0.82 | 908,373 | Mar 31, 2013 | | Smith Asset Management Group, L.P. | 172,690 | 0.61 | 671,764 | Mar 31, 2013 | | FMR, LLC | 159,514 | 0.56 | 620,509 | Mar 31, 2013 |
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| Holder | Shares | % Out | Value* | Reported |
|---|
| iShares Russell 2000 Index Fund | 386,687 | 1.37 | 1,504,212 | Mar 31, 2013 | | Vanguard Total Stock Market Index Fund | 244,287 | 0.86 | 1,001,576 | Dec 31, 2012 | | Bruce & Co., Inc. | 155,677 | 0.55 | 605,583 | Mar 31, 2013 | | Fidelity Select Portfolios - Biotechnology | 150,089 | 0.53 | 583,846 | Mar 31, 2013 | | College Retirement Equities Fund-Stock Account | 130,372 | 0.46 | 534,525 | Dec 31, 2012 | | Vanguard Institutional Index-Inst Total Stock Market Ind | 98,028 | 0.35 | 401,914 | Dec 31, 2012 | | iShares Russell 2000 Growth Index Fund | 98,600 | 0.35 | 383,554 | Mar 31, 2013 | | Vanguard Extended Market Index Fund | 98,951 | 0.35 | 405,699 | Dec 31, 2012 | | Vanguard Variable Insurance Fund-Small Company Growth | 79,200 | 0.28 | 324,720 | Dec 31, 2012 | | iShares Russell 2000 Value Index Fund | 66,172 | 0.23 | 257,409 | Mar 31, 2013 |
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View Transactions for Insiders & Institutional Holders Value shown is computed using the security's price on the report date given. Currency in USD. |