| 2019-08-01 | AMT | Chairman, President and CEO | Sale+OE | 57,438 | $211.89 | $12,170,567.52 | -4.8% | → |
| 2019-07-01 | AMT | Chairman, President and CEO | Sale+OE | 57,438 | $201.40 | $11,568,086.77 | -4.4% | → |
| 2019-06-03 | AMT | Chairman, President and CEO | Sale+OE | 57,439 | $207.93 | $11,943,484.88 | -8.3% | → |
| 2019-05-01 | AMT | Chairman, President and CEO | Sale+OE | 57,439 | $194.31 | $11,160,916.55 | -11.8% | → |
| 2019-04-17 | AMT | Chairman, President and CEO | Sell | 8,580 | $190.73 | $1,636,467.50 | -63.6% | → |
| 2019-04-16 | AMT | Chairman, President and CEO | Sell | 23,726 | $195.50 | $4,638,329.78 | -26.0% | → |
| 2018-08-06 | AMT | Chairman, President and CEO | Sale+OE | 43,808 | $150.65 | $6,599,484.32 | -10.6% | → |
| 2018-07-09 | AMT | Chairman, President and CEO | Sale+OE | 43,843 | $142.66 | $6,254,790.22 | -7.4% | → |
| 2018-06-11 | AMT | Chairman, President and CEO | Sale+OE | 43,843 | $138.92 | $6,090,472.27 | -10.8% | → |
| 2018-05-29 | AMT | Chairman, President and CEO | Sale+OE | 43,843 | $135.53 | $5,942,068.50 | -10.8% | → |
| 2017-12-11 | AMT | Chairman, President and CEO | Sale+OE | 34,667 | $142.52 | $4,940,745.60 | -5.8% | → |
| 2017-11-13 | AMT | Chairman, President and CEO | Sale+OE | 34,000 | $151.20 | $5,140,712.85 | -3.9% | → |
| 2017-10-16 | AMT | Chairman, President and CEO | Sale+OE | 34,000 | $139.40 | $4,739,504.67 | -5.9% | → |
| 2017-09-11 | AMT | Chairman, President and CEO | Sale+OE | 34,000 | $145.89 | $4,960,291.54 | -5.8% | → |
| 2017-03-07 | AMT | Chairman, President and CEO | Sale+OE | 69,760 | $114.62 | $7,996,191.85 | -12.0% | → |
| 2017-02-07 | AMT | Chairman, President and CEO | Sale+OE | 40,000 | $103.33 | $4,133,200.00 | -14.2% | → |
| 2017-01-10 | AMT | Chairman, President and CEO | Sale+OE | 40,000 | $104.13 | $4,165,041.00 | -7.6% | → |
| 2016-12-05 | AMT | Chairman, President and CEO | Sale+OE | 40,000 | $101.82 | $4,072,660.91 | -8.1% | → |
| 2016-10-17 | AMT | Chairman, President and CEO | Sale+OE | 40,625 | $113.45 | $4,608,906.25 | -15.2% | → |