| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | PAR CAPITAL MANAGEMENT, INC. | 1,962,618 | 6.58 | $14,444,868 | 30-Sep-09 | | AVENIR CORPORATION/DC | 1,805,667 | 6.05 | $13,289,709 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,687,659 | 5.66 | $12,421,170 | 30-Sep-09 | | Allianz Global Investors of America L.P. | 1,410,632 | 4.73 | $10,382,251 | 30-Sep-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 1,173,930 | 3.94 | $8,640,124 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,032,923 | 3.46 | $7,602,313 | 30-Sep-09 | | DAFNA Capital Management, LLC | 794,333 | 2.66 | $5,846,290 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 630,656 | 2.11 | $4,641,628 | 30-Sep-09 | | STATE STREET CORPORATION | 469,372 | 1.57 | $3,454,577 | 30-Sep-09 | | NORTHERN TRUST CORPORATION | 301,656 | 1.01 | $2,316,718 | 30-Jun-09 |
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| Holder | Shares | % Out | Value* | Reported | | Allianz Fds-OCC Opportunity Fd | 444,780 | 1.49 | $2,993,369 | 31-Aug-09 | | ISHARES RUSSELL 2000 INDEX FD | 382,482 | 1.28 | $2,815,067 | 30-Sep-09 | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 291,749 | .98 | $1,648,381 | 31-Oct-09 | | VANGUARD SMALL-CAP INDEX FUND | 289,312 | .97 | $2,221,916 | 30-Jun-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 288,998 | .97 | $2,219,504 | 30-Jun-09 | | Allianz VIP Tr-OCC Opportunity Fd | 275,800 | .92 | $2,118,144 | 30-Jun-09 | | DFA U.S. MICRO CAP SERIES | 244,062 | .82 | $1,869,514 | 30-Apr-09 | | SEI INSTITUTIONAL INVESTMENT TR-SMALL CAP FUND | 231,583 | .78 | $1,771,609 | 31-May-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 197,606 | .66 | $1,454,380 | 30-Sep-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 183,931 | .62 | $1,412,590 | 30-Jun-09 |
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Value shown is computed using the security's price on the report date given.
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