| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| DDS | Vice President | Sep 26, 2016 |
Option Exercise | $58.71 | 67 | 3,934 | 2,124 | Sep 28, 2016, 04:59 PM |
| DDS | Vice President | Aug 23, 2016 |
Option Exercise | $67.90 | 58 | 3,938 | 2,057 | Aug 25, 2016, 04:30 PM |
| DDS | Vice President | Aug 02, 2016 |
Option Exercise | $62.06 | 1 | 62 | 1,999 | Aug 04, 2016, 04:29 PM |
| DDS | Vice President | Jul 25, 2016 |
Option Exercise | $65.95 | 60 | 3,957 | 1,998 | Jul 27, 2016, 05:23 PM |
| DDS | Vice President | Jun 27, 2016 |
Option Exercise | $57.85 | 86 | 4,975 | 1,938 | Jun 29, 2016, 04:30 PM |
| DDS | Vice President | May 23, 2016 |
Option Exercise | $59.83 | 66 | 3,949 | 1,852 | May 24, 2016, 04:45 PM |
| DDS | Vice President | May 02, 2016 |
Option Exercise | $70.99 | 1 | 71 | 1,786 | May 04, 2016, 04:46 PM |
| DDS | Vice President | Apr 25, 2016 |
Option Exercise | $71.21 | 20 | 1,424 | 1,785 | Apr 27, 2016, 04:33 PM |
| DDS | Vice President | Feb 02, 2016 |
Option Exercise | $69.62 | 1 | 70 | 1,765 | Feb 02, 2016, 05:25 PM |
| DDS | Vice President | Jan 29, 2016 |
Option Exercise | $69.86 | 355 | 24,800 | 1,764 | Feb 02, 2016, 05:25 PM |
| DDS | Vice President | Jan 04, 2016 |
Option Exercise | $66.49 | 87 | 5,785 | 1,409 | Jan 06, 2016, 05:39 PM |
| DDS | Vice President | Dec 04, 2015 |
Option Exercise | $72.91 | 30 | 2,187 | 1,322 | Dec 07, 2015, 05:29 PM |
| DDS | Vice President | Nov 23, 2015 |
Option Exercise | $76.70 | 50 | 3,835 | 1,292 | Nov 25, 2015, 12:22 PM |
| DDS | Vice President | Oct 26, 2015 |
Option Exercise | $88.46 | 43 | 3,804 | 1,242 | Oct 27, 2015, 04:55 PM |
| DDS | Vice President | Sep 28, 2015 |
Option Exercise | $87.49 | 55 | 4,812 | 1,199 | Sep 29, 2015, 04:57 PM |
| DDS | Vice President | Aug 24, 2015 |
Option Exercise | $91.92 | 42 | 3,861 | 1,144 | Aug 26, 2015, 11:44 AM |
| DDS | Vice President | Jul 27, 2015 |
Option Exercise | $99.65 | 39 | 3,886 | 1,102 | Jul 29, 2015, 11:50 AM |
| DDS | Vice President | Jun 29, 2015 |
Option Exercise | $106.64 | 45 | 4,799 | 1,063 | Jun 30, 2015, 05:40 PM |
| DDS | Vice President | May 27, 2015 |
Option Exercise | $115.49 | 33 | 3,811 | 1,018 | May 29, 2015, 01:44 PM |
| DDS | Vice President | Apr 27, 2015 |
Option Exercise | $134.77 | 14 | 1,887 | 985 | Apr 28, 2015, 05:11 PM |
| DDS | Vice President | Jan 30, 2015 |
Option Exercise | $114.62 | 190 | 21,778 | 971 | Feb 03, 2015, 02:29 PM |
| DDS | Vice President | Dec 29, 2014 |
Option Exercise | $124.33 | 38 | 4,725 | 781 | Dec 31, 2014, 12:29 PM |
| DDS | Vice President | Nov 24, 2014 |
Option Exercise | $121.16 | 31 | 3,756 | 743 | Nov 26, 2014, 03:20 PM |
| DDS | Vice President | Oct 27, 2014 |
Option Exercise | $106.64 | 35 | 3,732 | 712 | Oct 29, 2014, 10:28 AM |
| DDS | Vice President | Sep 29, 2014 |
Option Exercise | $112.73 | 41 | 4,622 | 677 | Sep 30, 2014, 06:04 PM |
| DDS | Vice President | Aug 25, 2014 |
Option Exercise | $113.46 | 33 | 3,744 | 636 | Aug 26, 2014, 02:50 PM |
| DDS | Vice President | Jul 28, 2014 |
Option Exercise | $119.71 | 31 | 3,711 | 603 | Jul 29, 2014, 11:04 AM |
| DDS | Vice President | Jun 30, 2014 |
Option Exercise | $117.10 | 40 | 4,684 | 572 | Jul 02, 2014, 02:39 PM |
| DDS | Vice President | May 27, 2014 |
Option Exercise | $111.10 | 6 | 667 | 532 | May 28, 2014, 03:19 PM |
| DDS | Vice President | May 06, 2014 |
Option Exercise | $96.60 | 5 | 483 | 526 | May 08, 2014, 08:59 AM |
| DDS | Vice President | Apr 09, 2014 |
Sale | $93.97 | 7,657 | 719,528 | 521 | Apr 09, 2014, 12:20 PM |
| DDS | Vice President | Feb 04, 2014 |
Option Exercise | $86.07 | 5 | 430 | 8,178 | Feb 06, 2014, 03:48 PM |
| DDS | Vice President | Jan 31, 2014 |
Option Exercise | $88.18 | 274 | 24,161 | 8,173 | Feb 04, 2014, 11:29 AM |
| DDS | Vice President | Dec 30, 2013 |
Option Exercise | $96.68 | 47 | 4,544 | 7,899 | Dec 31, 2013, 02:10 PM |
| DDS | Vice President | Nov 25, 2013 |
Option Exercise | $91.09 | 40 | 3,644 | 7,852 | Nov 27, 2013, 03:20 PM |
| DDS | Chairman St Louis Division | Mar 07, 2012 |
Sale | $61.00 | 2,000 | 122,000 | 11,726 | Mar 08, 2012, 12:14 PM |
| DDS | Chairman St Louis Division | Nov 01, 2011 |
Option Exercise | $50.82 | 6 | 305 | 13,726 | Nov 03, 2011, 12:47 PM |
| DDS | Chairman St Louis Division | Oct 24, 2011 |
Option Exercise | $52.02 | 60 | 3,121 | 13,720 | Oct 25, 2011, 04:11 PM |
| DDS | Chairman St Louis Division | Sep 26, 2011 |
Option Exercise | $46.03 | 85 | 3,913 | 13,660 | Sep 28, 2011, 01:27 PM |
| DDS | Chairman St Louis Division | Aug 22, 2011 |
Option Exercise | $40.48 | 77 | 3,117 | 13,575 | Aug 23, 2011, 11:34 AM |
| DDS | Chairman St Louis Division | Aug 02, 2011 |
Option Exercise | $55.61 | 5 | 278 | 13,498 | Aug 03, 2011, 05:05 PM |
| DDS | Chairman St Louis Division | Jul 25, 2011 |
Option Exercise | $59.40 | 52 | 3,089 | 13,493 | Jul 27, 2011, 12:44 PM |
| DDS | Chairman St Louis Division | Jun 27, 2011 |
Option Exercise | $51.84 | 47 | 2,436 | 13,441 | Jun 28, 2011, 02:49 PM |
| DDS | Chairman St Louis Division | May 26, 2011 |
Option Exercise | $25.74 | 20,000 | 514,800 | 33,394 | May 26, 2011, 04:41 PM |
| DDS | Chairman St Louis Division | May 26, 2011 |
Sale | $55.90 | 20,000 | 1,118,000 | 13,394 | May 26, 2011, 04:41 PM |
| DDS | Chairman St Louis Division | May 03, 2011 |
Option Exercise | $46.40 | 5 | 232 | 13,394 | May 05, 2011, 02:06 PM |
| DDS | Chairman St Louis Division | Mar 04, 2011 |
Option Exercise | $39.52 | 427 | 16,875 | 13,389 | Mar 07, 2011, 06:12 PM |
| DDS | Chairman St Louis Division | Feb 02, 2011 |
Option Exercise | $38.74 | 6 | 232 | 12,962 | Feb 04, 2011, 09:47 AM |
| DDS | Chairman St Louis Division | Dec 31, 2010 |
Option Exercise | $37.93 | 117 | 4,438 | 12,956 | Jan 04, 2011, 01:46 PM |
| DDS | Chairman St Louis Division | Nov 22, 2010 |
Option Exercise | $31.84 | 93 | 2,961 | 12,839 | Nov 23, 2010, 04:59 PM |
| DDS | Chairman St Louis Division | Nov 02, 2010 |
Option Exercise | $25.68 | 9 | 231 | 12,746 | Nov 04, 2010, 04:19 PM |
| DDS | Chairman St Louis Division | Oct 25, 2010 |
Option Exercise | $27.33 | 108 | 2,952 | 12,737 | Oct 26, 2010, 06:56 PM |
| DDS | Chairman St Louis Division | Sep 27, 2010 |
Option Exercise | $23.91 | 155 | 3,706 | 12,629 | Sep 29, 2010, 02:39 PM |
| DDS | Chairman St Louis Division | Aug 23, 2010 |
Option Exercise | $21.56 | 137 | 2,954 | 12,474 | Aug 24, 2010, 04:28 PM |
| DDS | Chairman St Louis Division | Aug 03, 2010 |
Option Exercise | $23.54 | 9 | 212 | 12,337 | Aug 05, 2010, 03:56 PM |
| DDS | Chairman St Louis Division | Jul 26, 2010 |
Option Exercise | $23.84 | 62 | 1,478 | 12,328 | Jul 28, 2010, 08:37 AM |
| Symbol | Relationship | Date | Transaction | Value($) |
| DDS | Vice President | Sep 26, 2016 |
Option Exercise | 3,934 |
| DDS | Vice President | Aug 23, 2016 |
Option Exercise | 3,938 |
| DDS | Vice President | Aug 02, 2016 |
Option Exercise | 62 |
| DDS | Vice President | Jul 25, 2016 |
Option Exercise | 3,957 |
| DDS | Vice President | Jun 27, 2016 |
Option Exercise | 4,975 |
| DDS | Vice President | May 23, 2016 |
Option Exercise | 3,949 |
| DDS | Vice President | May 02, 2016 |
Option Exercise | 71 |
| DDS | Vice President | Apr 25, 2016 |
Option Exercise | 1,424 |
| DDS | Vice President | Feb 02, 2016 |
Option Exercise | 70 |
| DDS | Vice President | Jan 29, 2016 |
Option Exercise | 24,800 |
| DDS | Vice President | Jan 04, 2016 |
Option Exercise | 5,785 |
| DDS | Vice President | Dec 04, 2015 |
Option Exercise | 2,187 |
| DDS | Vice President | Nov 23, 2015 |
Option Exercise | 3,835 |
| DDS | Vice President | Oct 26, 2015 |
Option Exercise | 3,804 |
| DDS | Vice President | Sep 28, 2015 |
Option Exercise | 4,812 |
| DDS | Vice President | Aug 24, 2015 |
Option Exercise | 3,861 |
| DDS | Vice President | Jul 27, 2015 |
Option Exercise | 3,886 |
| DDS | Vice President | Jun 29, 2015 |
Option Exercise | 4,799 |
| DDS | Vice President | May 27, 2015 |
Option Exercise | 3,811 |
| DDS | Vice President | Apr 27, 2015 |
Option Exercise | 1,887 |
| DDS | Vice President | Jan 30, 2015 |
Option Exercise | 21,778 |
| DDS | Vice President | Dec 29, 2014 |
Option Exercise | 4,725 |
| DDS | Vice President | Nov 24, 2014 |
Option Exercise | 3,756 |
| DDS | Vice President | Oct 27, 2014 |
Option Exercise | 3,732 |
| DDS | Vice President | Sep 29, 2014 |
Option Exercise | 4,622 |
| DDS | Vice President | Aug 25, 2014 |
Option Exercise | 3,744 |
| DDS | Vice President | Jul 28, 2014 |
Option Exercise | 3,711 |
| DDS | Vice President | Jun 30, 2014 |
Option Exercise | 4,684 |
| DDS | Vice President | May 27, 2014 |
Option Exercise | 667 |
| DDS | Vice President | May 06, 2014 |
Option Exercise | 483 |
| DDS | Vice President | Apr 09, 2014 |
Sale | 719,528 |
| DDS | Vice President | Feb 04, 2014 |
Option Exercise | 430 |
| DDS | Vice President | Jan 31, 2014 |
Option Exercise | 24,161 |
| DDS | Vice President | Dec 30, 2013 |
Option Exercise | 4,544 |
| DDS | Vice President | Nov 25, 2013 |
Option Exercise | 3,644 |
| DDS | Chairman St Louis Division | Mar 07, 2012 |
Sale | 122,000 |
| DDS | Chairman St Louis Division | Nov 01, 2011 |
Option Exercise | 305 |
| DDS | Chairman St Louis Division | Oct 24, 2011 |
Option Exercise | 3,121 |
| DDS | Chairman St Louis Division | Sep 26, 2011 |
Option Exercise | 3,913 |
| DDS | Chairman St Louis Division | Aug 22, 2011 |
Option Exercise | 3,117 |
| DDS | Chairman St Louis Division | Aug 02, 2011 |
Option Exercise | 278 |
| DDS | Chairman St Louis Division | Jul 25, 2011 |
Option Exercise | 3,089 |
| DDS | Chairman St Louis Division | Jun 27, 2011 |
Option Exercise | 2,436 |
| DDS | Chairman St Louis Division | May 26, 2011 |
Option Exercise | 514,800 |
| DDS | Chairman St Louis Division | May 26, 2011 |
Sale | 1,118,000 |
| DDS | Chairman St Louis Division | May 03, 2011 |
Option Exercise | 232 |
| DDS | Chairman St Louis Division | Mar 04, 2011 |
Option Exercise | 16,875 |
| DDS | Chairman St Louis Division | Feb 02, 2011 |
Option Exercise | 232 |
| DDS | Chairman St Louis Division | Dec 31, 2010 |
Option Exercise | 4,438 |
| DDS | Chairman St Louis Division | Nov 22, 2010 |
Option Exercise | 2,961 |
| DDS | Chairman St Louis Division | Nov 02, 2010 |
Option Exercise | 231 |
| DDS | Chairman St Louis Division | Oct 25, 2010 |
Option Exercise | 2,952 |
| DDS | Chairman St Louis Division | Sep 27, 2010 |
Option Exercise | 3,706 |
| DDS | Chairman St Louis Division | Aug 23, 2010 |
Option Exercise | 2,954 |
| DDS | Chairman St Louis Division | Aug 03, 2010 |
Option Exercise | 212 |
| DDS | Chairman St Louis Division | Jul 26, 2010 |
Option Exercise | 1,478 |
