| SC 13G | 2010-02-11 | HARRIS ASSOCIATES L P | LABORATORY CORP OF AMERICA HOLDINGS | 6,897,850 | 6.4% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | LABORATORY CORP OF AMERICA HOLDINGS | 5,563,125 | 5.2% | EDGAR |
| SC 13G/A | 2009-02-17 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 6,156,733 | 5.7% | EDGAR |
| SC 13G/A | 2009-02-13 | PRICE T ROWE ASSOCIATES INC /MD/ | LABORATORY CORP OF AMERICA HOLDINGS | 490,135 | 0.4% | EDGAR |
| SC 13G | 2009-02-06 | GOLDMAN SACHS ASSET MANAGEMENT LP | LABORATORY CORP OF AMERICA HOLDINGS | 6,107,758 | 5.7% | EDGAR |
| SC 13D/A | 2009-01-23 | LONGVIEW ASSET MANAGEMENT, LLC | LABORATORY CORP OF AMERICA HOLDINGS | 5,357,355 | 5.0% | EDGAR |
| SC 13D/A | 2008-10-14 | LONGVIEW ASSET MANAGEMENT, LLC | LABORATORY CORP OF AMERICA HOLDINGS | 5,783,216 | 5.2% | EDGAR |
| SC 13G/A | 2008-02-14 | JANUS CAPITAL MANAGEMENT LLC | LABORATORY CORP OF AMERICA HOLDINGS | 1,554,637 | 1.3% | EDGAR |
| SC 13G/A | 2008-02-14 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 7,838,604 | 6.8% | EDGAR |
| SC 13G | 2008-02-13 | PRICE T ROWE ASSOCIATES INC /MD/ | LABORATORY CORP OF AMERICA HOLDINGS | 8,098,881 | 7.0% | EDGAR |
| SC 13D/A | 2007-03-02 | LONGVIEW ASSET MANAGEMENT, LLC | LABORATORY CORP OF AMERICA HOLDINGS | 7,584,731 | 6.2% | EDGAR |
| SC 13G/A | 2007-02-14 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 7,391,779 | 5.9% | EDGAR |
| SC 13G | 2007-02-14 | JANUS CAPITAL MANAGEMENT LLC | LABORATORY CORP OF AMERICA HOLDINGS | 7,271,490 | 5.8% | EDGAR |
| SC 13G/A | 2006-02-14 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 9,943,708 | 7.5% | EDGAR |
| SC 13D | 2005-11-14 | LONGVIEW ASSET MANAGEMENT, LLC | LABORATORY CORP OF AMERICA HOLDINGS | 6,758,261 | 5.1% | EDGAR |
| SC 13G/A | 2005-02-14 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 8,229,361 | 5.9% | EDGAR |
| SC 13G/A | 2004-10-12 | SELIGMAN J & W & CO INC /NY/ | LABORATORY CORP OF AMERICA HOLDINGS | 7,429,170 | 3.4% | EDGAR |
| SC 13G/A | 2004-02-13 | CHIEFTAIN CAPITAL MANAGEMENT INC | LABORATORY CORP OF AMERICA HOLDINGS | 12,432,908 | 8.7% | EDGAR |
| SC 13G/A | 2004-02-12 | WELLINGTON MANAGEMENT CO LLP | LABORATORY CORP OF AMERICA HOLDINGS | 3,883,914 | 2.7% | EDGAR |
| SC 13G | 2004-02-11 | SELIGMAN J & W & CO INC /NY/ | LABORATORY CORP OF AMERICA HOLDINGS | 7,902,937 | 5.5% | EDGAR |