| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| DDS | Director | May 20, 2023 | Option Exercise | $284.50 | 500 | 142,250 | 22,330 | May 23, 2023, 04:34 PM |
| DDS | Director | May 21, 2022 | Option Exercise | $257.85 | 1,000 | 257,850 | 21,830 | May 24, 2022, 05:15 PM |
| DDS | Director | Apr 28, 2022 | Buy | $293.39 | 3 | 880 | 20,830 | May 02, 2022, 05:09 PM |
| DDS | Director | Jan 27, 2022 | Buy | $265.04 | 3 | 795 | 20,827 | Feb 01, 2022, 06:23 PM |
| DDS | Director | Dec 13, 2021 | Buy | $267.61 | 224 | 59,945 | 20,824 | Jan 24, 2022, 04:32 PM |
| DDS | Director | May 15, 2021 | Option Exercise | $118.51 | 1,000 | 118,510 | 20,600 | May 18, 2021, 05:26 PM |
| DDS | Director | May 16, 2020 | Option Exercise | $24.89 | 4,000 | 99,560 | 19,600 | May 19, 2020, 04:43 PM |
| DDS | Director | May 18, 2019 | Option Exercise | $57.46 | 2,200 | 126,412 | 15,600 | May 21, 2019, 04:34 PM |
| DDS | Director | May 19, 2018 | Option Exercise | $76.38 | 1,600 | 122,208 | 13,400 | May 22, 2018, 05:09 PM |
| DDS | Director | May 20, 2017 | Option Exercise | $48.63 | 2,400 | 116,712 | 11,800 | May 23, 2017, 05:30 PM |
| DDS | Director | May 21, 2016 | Option Exercise | $57.08 | 2,000 | 114,160 | 9,400 | May 24, 2016, 04:54 PM |
| DDS | Director | May 16, 2015 | Option Exercise | $116.15 | 1,000 | 116,150 | 3,400 | May 18, 2015, 06:42 PM |
| DDS | Director | May 18, 2015 | Buy | $115.61 | 4,000 | 462,440 | 7,400 | May 18, 2015, 06:42 PM |
| DDS | Director | May 17, 2014 | Option Exercise | $106.93 | 1,200 | 128,316 | 2,400 | May 19, 2014, 05:36 PM |
| DDS | Director | May 20, 2013 | Option Exercise | $91.52 | 1,200 | 109,824 | 1,200 | May 20, 2013, 11:33 AM |
| Symbol | Relationship | Date | Transaction | Value($) |
| DDS | Director | May 20, 2023 | Option Exercise | 142,250 |
| DDS | Director | May 21, 2022 | Option Exercise | 257,850 |
| DDS | Director | Apr 28, 2022 | Buy | 880 |
| DDS | Director | Jan 27, 2022 | Buy | 795 |
| DDS | Director | Dec 13, 2021 | Buy | 59,945 |
| DDS | Director | May 15, 2021 | Option Exercise | 118,510 |
| DDS | Director | May 16, 2020 | Option Exercise | 99,560 |
| DDS | Director | May 18, 2019 | Option Exercise | 126,412 |
| DDS | Director | May 19, 2018 | Option Exercise | 122,208 |
| DDS | Director | May 20, 2017 | Option Exercise | 116,712 |
| DDS | Director | May 21, 2016 | Option Exercise | 114,160 |
| DDS | Director | May 16, 2015 | Option Exercise | 116,150 |
| DDS | Director | May 18, 2015 | Buy | 462,440 |
| DDS | Director | May 17, 2014 | Option Exercise | 128,316 |
| DDS | Director | May 20, 2013 | Option Exercise | 109,824 |