| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2015-02-11 | TimesSquare Capital Management, LLC | CLEAN HARBORS INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2015-02-09 | BlackRock Inc. | CLEAN HARBORS INC | 3,298,576 | 5.5% | EDGAR |
| SC 13D/A | 2015-02-05 | RELATIONAL INVESTORS LLC | CLEAN HARBORS INC | 3,521,225 | 5.9% | EDGAR |
| SC 13D/A | 2015-01-26 | RELATIONAL INVESTORS LLC | CLEAN HARBORS INC | 4,548,218 | 7.6% | EDGAR |
| SC 13D | 2014-04-24 | RELATIONAL INVESTORS LLC | CLEAN HARBORS INC | 5,516,622 | 9.1% | EDGAR |
| SC 13G | 2014-02-14 | WELLINGTON MANAGEMENT CO LLP | CLEAN HARBORS INC | 3,449,791 | 5.7% | EDGAR |
| SC 13G/A | 2014-02-12 | PRICE T ROWE ASSOCIATES INC /MD/ | CLEAN HARBORS INC | 209,780 | 0.3% | EDGAR |
| SC 13G/A | 2014-02-12 | VANGUARD GROUP INC | CLEAN HARBORS INC | 3,066,686 | 5.0% | EDGAR |
| SC 13G/A | 2014-02-10 | WELLINGTON MANAGEMENT CO LLP | CLEAN HARBORS INC | 6,177,599 | 10.2% | EDGAR |
| SC 13G/A | 2014-02-10 | TimesSquare Capital Management, LLC | CLEAN HARBORS INC | 4,434,053 | 7.3% | EDGAR |
| SC 13G | 2014-01-28 | BlackRock Inc. | CLEAN HARBORS INC | 3,238,152 | 5.3% | EDGAR |
| SC 13G/A | 2013-10-25 | NORGES BANK | CLEAN HARBORS INC | 2,905,134 | 4.8% | EDGAR |
| SC 13G/A | 2013-07-10 | PRICE T ROWE ASSOCIATES INC /MD/ | CLEAN HARBORS INC | 4,584,406 | 7.5% | EDGAR |
| SC 13G | 2013-07-05 | Norges Bank | CLEAN HARBORS INC | 3,071,134 | 5.1% | EDGAR |
| SC 13G | 2013-02-12 | VANGUARD GROUP INC | CLEAN HARBORS INC | 2,997,773 | 5.0% | EDGAR |
| SC 13G | 2013-02-11 | TimesSquare Capital Management, LLC | CLEAN HARBORS INC | 4,979,928 | 8.3% | EDGAR |
| SC 13G/A | 2013-02-07 | PRICE T ROWE ASSOCIATES INC /MD/ | CLEAN HARBORS INC | 7,741,800 | 13.0% | EDGAR |
| SC 13G/A | 2012-07-11 | BlackRock Inc. | CLEAN HARBORS INC | 2,356,241 | 4.4% | EDGAR |
| SC 13G/A | 2012-06-08 | PRICE T ROWE ASSOCIATES INC /MD/ | CLEAN HARBORS INC | 5,772,200 | 10.8% | EDGAR |
| SC 13G/A | 2012-02-13 | BlackRock Inc. | CLEAN HARBORS INC | 3,286,231 | 6.2% | EDGAR |