| Top Institutional Holders |
|---|
| Holder | Shares | % Out | Value* | Reported |
|---|
| Wellington Management Company, LLP | 1,596,981 | 6.63 | 13,462,549 | Mar 31, 2013 | | Vanguard Group, Inc. (The) | 534,880 | 2.22 | 4,509,038 | Mar 31, 2013 | | BlackRock Fund Advisors | 507,776 | 2.11 | 4,280,551 | Mar 31, 2013 | | State Street Corporation | 285,448 | 1.18 | 2,406,326 | Mar 31, 2013 | | Dimensional Fund Advisors LP | 263,310 | 1.09 | 2,219,703 | Mar 31, 2013 | | Northern Trust Corporation | 259,040 | 1.07 | 2,183,707 | Mar 31, 2013 | | BlackRock Institutional Trust Company, N.A. | 252,860 | 1.05 | 2,131,609 | Mar 31, 2013 | | Credit Suisse/ | 160,123 | 0.66 | 1,349,836 | Mar 31, 2013 | | TIAA-CREF Investment Management, LLC | 82,648 | 0.34 | 696,722 | Mar 31, 2013 | | Geode Capital Management, LLC | 78,038 | 0.32 | 657,860 | Mar 31, 2013 |
|
| Holder | Shares | % Out | Value* | Reported |
|---|
| iShares Russell 2000 Index Fund | 315,412 | 1.31 | 2,658,923 | Mar 31, 2013 | | Vanguard Small-Cap Index Fund | 298,359 | 1.24 | 2,479,363 | Dec 31, 2012 | | Vanguard Total Stock Market Index Fund | 224,898 | 0.93 | 1,868,902 | Dec 31, 2012 | | Vanguard Small-Cap Growth Index Fund | 210,294 | 0.87 | 1,747,543 | Dec 31, 2012 | | iShares Russell 2000 Growth Index Fund | 141,134 | 0.59 | 1,189,759 | Mar 31, 2013 | | DFA U.S. Micro Cap Series | 108,773 | 0.45 | 860,394 | Jan 31, 2013 | | College Retirement Equities Fund-Stock Account | 67,402 | 0.28 | 560,110 | Dec 31, 2012 | | Bridgeway Funds Inc-Ultra Small Company Market Fund | 51,100 | 0.21 | 424,641 | Dec 31, 2012 | | Vanguard Extended Market Index Fund | 49,424 | 0.21 | 410,713 | Dec 31, 2012 | | iShares Russell Micro Cap (TM) Index Fund | 42,730 | 0.18 | 360,213 | Mar 31, 2013 |
|
View Transactions for Insiders & Institutional Holders Value shown is computed using the security's price on the report date given. Currency in USD. |