| Company | Symbol | Price | Amount | Relationship | Remaining Holdings | Date | Form 4 |
| CLH | $48.82 | 3,000 | Director | 13,640 | 2012-09-21 | Filing |
| CLH | $103.20 | 5,500 | Director | 7,750 | 2011-06-30 | Filing |
| CLH | $98.11 | 2,000 | Director | 6,483 | 2011-04-19 | Filing |
| CLH | $51.11 | 3,000 | Director | 3,900 | 2009-05-13 | Filing |