| SC 13G/A | 2009-02-10 | SECURITY CAPITAL RESEARCH & MANAGEMENT INC | CORPORATE OFFICE PROPERTIES TRUST | 2,394,712 | 4.6% | EDGAR |
| SC 13G | 2009-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | CORPORATE OFFICE PROPERTIES TRUST | 1,278,559 | 2.5% | EDGAR |
| SC 13G | 2009-01-16 | DIAM Co., Ltd. | CORPORATE OFFICE PROPERTIES TRUST | 3,038,927 | 6.4% | EDGAR |
| SC 13D/A | 2008-06-16 | SHIDLER JAY H | CORPORATE OFFICE PROPERTIES TRUST | 3,493,580 | 6.8% | EDGAR |
| SC 13G/A | 2008-05-12 | FMR LLC | CORPORATE OFFICE PROPERTIES TRUST | 4,916,713 | 10.4% | EDGAR |
| SC 13G/A | 2008-02-15 | SECURITY CAPITAL RESEARCH & MANAGEMENT INC | CORPORATE OFFICE PROPERTIES TRUST | 2,378,723 | 5.0% | EDGAR |
| SC 13G | 2008-02-15 | LASALLE INVESTMENT MANAGEMENT SECURITIES LP | CORPORATE OFFICE PROPERTIES TRUST | 323,374 | 0.7% | EDGAR |
| SC 13G/A | 2008-02-14 | FMR LLC | CORPORATE OFFICE PROPERTIES TRUST | 4,345,213 | 9.2% | EDGAR |
| SC 13G/A | 2008-02-14 | VANGUARD GROUP INC | CORPORATE OFFICE PROPERTIES TRUST | 2,818,504 | 6.0% | EDGAR |
| SC 13G/A | 2008-02-14 | ING GROEP NV | CORPORATE OFFICE PROPERTIES TRUST | 2,186,526 | 4.6% | EDGAR |
| SC 13G/A | 2008-02-12 | DAVIS SELECTED ADVISERS | CORPORATE OFFICE PROPERTIES TRUST | 4,211,915 | 8.9% | EDGAR |
| SC 13G/A | 2008-02-11 | VANGUARD GROUP INC | CORPORATE OFFICE PROPERTIES TRUST | 2,818,504 | 6.0% | EDGAR |
| SC 13G | 2008-01-30 | DLIBJ ASSET MANAGEMENT CO LTD | CORPORATE OFFICE PROPERTIES TRUST | 3,038,927 | 6.4% | EDGAR |
| SC 13G/A | 2007-02-15 | SECURITY CAPITAL RESEARCH & MANAGEMENT INC | CORPORATE OFFICE PROPERTIES TRUST | 2,664,603 | 6.2% | EDGAR |
| SC 13G/A | 2007-02-14 | ING GROEP NV | CORPORATE OFFICE PROPERTIES TRUST | 4,787,065 | 11.2% | EDGAR |
| SC 13G | 2007-02-14 | FMR CORP | CORPORATE OFFICE PROPERTIES TRUST | 2,896,500 | 6.8% | EDGAR |
| SC 13G | 2007-02-14 | VANGUARD GROUP INC | CORPORATE OFFICE PROPERTIES TRUST | 2,267,771 | 5.3% | EDGAR |
| SC 13G | 2007-02-13 | ING CLARION REAL ESTATE SECURITIES/N L.P. | CORPORATE OFFICE PROPERTIES TRUST | 2,717,739 | 6.4% | EDGAR |
| SC 13G | 2007-02-01 | Adelante Capital Management LLC | CORPORATE OFFICE PROPERTIES TRUST | 2,513,846 | 5.9% | EDGAR |
| SC 13G/A | 2007-01-11 | DAVIS SELECTED ADVISERS | CORPORATE OFFICE PROPERTIES TRUST | 3,018,892 | 7.0% | EDGAR |