| 2016-09-14 | Griffin William F Jr | VC/CEO of Gemma Power Systems | Sell | 25,000 | $52.16 | $1,304,070.00 | -6.2% | → |
| 2016-09-12 | Griffin William F Jr | VC/CEO of Gemma Power Systems | Sell | 33,689 | $51.58 | $1,737,715.68 | -7.7% | → |
| 2016-09-09 | Deily Richard H | Vice President | Sale+OE | 10,000 | $52.46 | $524,577.00 | -100% | → |
| 2016-09-09 | Griffin William F Jr | VC/CEO of Gemma Power Systems | Sell | 16,311 | $52.50 | $856,327.50 | -3.6% | → |
| 2016-07-13 | Deily Richard H | Vice President | Sale+OE | 7,000 | $46.78 | $327,460.00 | -100% | → |
| 2016-06-10 | Martin Daniel L | President, Gemma Power Systems | Sell | 15,000 | $41.10 | $616,520.00 | -24.4% | → |
| 2016-01-08 | Watson David Hibbert | SVP and CFO | Buy | 350 | $29.18 | $10,213.00 | +35.0% | → |
| 2015-12-15 | Watson David Hibbert | SVP and CFO | Buy | 1,000 | $32.39 | $32,390.00 | New | → |
| 2015-12-15 | Getsinger Peter W | Director | Buy | 3,300 | $32.55 | $107,408.13 | +45.8% | → |
| 2015-05-29 | Sherras Brian R | Director | Buy | 27,965 | $0.00 | - | New | → |
| 2015-04-27 | Martin Daniel L | President, Gemma Power Systems | Sell | 30,000 | $32.54 | $976,135.00 | -10.8% | → |
| 2015-03-18 | Flanders Cynthia | SVP and CFO | Sell | 3,000 | $34.00 | $102,000.00 | -30.0% | → |
| 2015-01-29 | BOSSELMANN RAINER H | Chairman of the Board and CEO | Sell | 2,235 | $32.00 | $71,520.00 | -0.7% | → |
| 2015-01-26 | BOSSELMANN RAINER H | Chairman of the Board and CEO | Sell | 8,021 | $32.03 | $256,888.57 | -2.5% | → |
| 2015-01-26 | Martin Daniel L | President, Gemma Power Systems | Sell | 20,380 | $32.03 | $652,812.34 | -23.9% | → |
| 2015-01-23 | BOSSELMANN RAINER H | Chairman of the Board and CEO | Sell | 300 | $32.00 | $9,600.00 | - | → |
| 2015-01-22 | TRUDEL ARTHUR F | Former Senior VP and CFO | Sell | 10,000 | $30.60 | $305,951.75 | -20.0% | → |
| 2015-01-15 | Martin Daniel L | President, Gemma Power Systems | Sell | 5,300 | $31.13 | $164,980.00 | -5.5% | → |