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| 23 Dec 2020 | FTEKFuel Tech Inc | Dennis L Zeitler Director | Option | 71,000 | $1.20 | $85,200 23 Dec 2020 | 133,627 | ↗ |
| 12 Dec 2017 | FTEKFuel Tech Inc | Dennis L Zeitler Director | Buy | 50,000 | $1.01 | $50,500 12 Dec 2017 | 50,000 | ↗ |
| 29 Jul 2013 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 10,000 | $52.78 | $527,800 29 Jul 2013 | 35,863 | ↗ |
| 10 May 2013 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 34,899 | $17.83 | $622,249 10 May 2013 | 82,688 | ↗ |
| 22 Aug 2012 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 20,000 | $36.28 | $725,600 22 Aug 2012 | 43,195 | ↗ |
| 4 Aug 2008 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Buy | 5,000 | $33.56 | $167,800 4 Aug 2008 | 44,528 | ↗ |
| 15 Mar 2008 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 583 | $41.58 | $24,241 15 Mar 2008 | 39,528 | ↗ |
| 24 Aug 2007 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 9,900 | $50.00 | $495,000 24 Aug 2007 | 37,560 | ↗ |
| 10 Aug 2007 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 24,699 | $25.07 | $619,204 10 Aug 2007 | 71,924 | ↗ |
| 15 Mar 2007 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 858 | $41.30 | $35,435 15 Mar 2007 | 34,787 | ↗ |
| 30 Jun 2006 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 3,000 | $40.41 | $121,230 30 Jun 2006 | 33,138 | ↗ |
| 15 Jun 2006 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 1,000 | $41.00 | $41,000 15 Jun 2006 | 36,138 | ↗ |
| 15 Mar 2006 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 1,828 | $39.47 | $72,151 15 Mar 2006 | 37,138 | ↗ |
| 18 May 2005 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 10,000 | $44.88 | $448,800 18 May 2005 | 36,528 | ↗ |
| 15 Mar 2005 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 2,021 | $38.92 | $78,657 15 Mar 2005 | 46,528 | ↗ |
| 3 Feb 2005 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 49,071 | $12.14 | $595,722 3 Feb 2005 | 96,227 | ↗ |
| 12 Nov 2004 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 25,000 | $46.71 | $1,167,750 12 Nov 2004 | 47,156 | ↗ |
| 7 Sep 2004 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Sale | 5,000 | $43.16 | $215,800 7 Sep 2004 | 72,156 | ↗ |
| 20 Aug 2004 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 66,747 | $10.65 | $710,856 20 Aug 2004 | 107,037 | ↗ |
| 3 Dec 2003 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 5,952 | $22.29 | $132,670 3 Dec 2003 | 18,751 | ↗ |
| 11 Nov 2003 | MSAMSA Safety Inc | Dennis L Zeitler Vice President, CFO, and Treasurer | Option | 8,089 | $20.84 | $168,575 11 Nov 2003 | 0 | ↗ |
