| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2012-02-10 | PRICE T ROWE ASSOCIATES INC /MD/ | CLEAN HARBORS INC | 3,503,233 | 6.6% | EDGAR |
| SC 13G/A | 2011-02-14 | FMR LLC | CLEAN HARBORS INC | 919,400 | 3.5% | EDGAR |
| SC 13G/A | 2011-02-14 | SNYDER CAPITAL MANAGEMENT L P | CLEAN HARBORS INC | 1,177,350 | 4.5% | EDGAR |
| SC 13G/A | 2011-02-03 | BlackRock Inc. | CLEAN HARBORS INC | 1,938,239 | 7.4% | EDGAR |
| SC 13G | 2010-02-16 | FMR LLC | CLEAN HARBORS INC | 1,918,790 | 7.3% | EDGAR |
| SC 13G | 2010-02-12 | SNYDER CAPITAL MANAGEMENT L P | CLEAN HARBORS INC | 1,358,670 | 5.2% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | CLEAN HARBORS INC | 1,970,774 | 7.5% | EDGAR |
| SC 13G/A | 2009-02-13 | SNYDER CAPITAL MANAGEMENT INC | CLEAN HARBORS INC | 1,054,185 | 4.5% | EDGAR |
| SC 13G/A | 2009-02-13 | Bank of New York Mellon CORP | CLEAN HARBORS INC | 1,057,798 | 4.4% | EDGAR |
| SC 13G/A | 2008-10-10 | FMR LLC | CLEAN HARBORS INC | 709,940 | 3.0% | EDGAR |
| SC 13G/A | 2008-02-14 | FMR LLC | CLEAN HARBORS INC | 1,755,245 | 8.8% | EDGAR |
| SC 13G/A | 2008-02-14 | FRIESS ASSOCIATES LLC | CLEAN HARBORS INC | - | - | EDGAR |
| SC 13G | 2008-02-14 | SNYDER CAPITAL MANAGEMENT L P | CLEAN HARBORS INC | 1,149,485 | 5.7% | EDGAR |
| SC 13G | 2008-02-14 | Bank of New York Mellon CORP | CLEAN HARBORS INC | 1,351,622 | 6.8% | EDGAR |
| SC 13G/A | 2007-12-10 | FMR LLC | CLEAN HARBORS INC | 1,976,069 | 9.9% | EDGAR |
| SC 13G/A | 2007-11-23 | GENDELL JEFFREY L ET AL | CLEAN HARBORS INC | 858,937 | 4.3% | EDGAR |
| SC 13G | 2007-02-15 | FRIESS ASSOCIATES LLC | CLEAN HARBORS INC | - | - | EDGAR |
| SC 13G/A | 2007-02-14 | FMR CORP | CLEAN HARBORS INC | 2,947,513 | 15.0% | EDGAR |
| SC 13G/A | 2007-02-14 | GLG Partners LP | CLEAN HARBORS INC | 683,532 | 3.5% | EDGAR |
| SC 13G/A | 2007-02-13 | PUTNAM LLC | CLEAN HARBORS INC | 41,802 | 0.2% | EDGAR |