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| Latest Insider Trading | Top Insider Trading Recent Week | Top 10% Owner Trading Recent Week | Filter
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| Ticker | Owner | Relationship | Date | Transaction | Cost  |
#Shares | Value ($) | #Shares Total | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| CHE | Nicholas Westfall | former officer | Dec 11 '25 | Proposed Sale | 430.62 | 942 | 405,645 | Dec 11 12:22 PM | |
| CHE | Westfall Nicholas Michael | Executive Vice President | Aug 04 '25 | Sale | 421.91 | 10,012 | 4,224,163 | 0 | Aug 05 10:30 AM |
| CHE | Nicholas M Westfall | Officer | Aug 04 '25 | Proposed Sale | 417.85 | 10,012 | 4,183,514 | Aug 04 04:50 PM | |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 09 '25 | Option Exercise | 451.72 | 26,088 | 11,784,456 | 33,012 | May 12 02:42 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 14 '25 | Option Exercise | 553.39 | 1,473 | 815,143 | 7,582 | Feb 18 05:05 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Sep 09 '24 | Sale | 569.35 | 1,713 | 975,297 | 6,109 | Sep 10 11:14 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Sep 04 '24 | Option Exercise | 471.74 | 15,333 | 7,233,189 | 21,442 | Sep 06 10:20 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jul 30 '24 | Sale | 561.58 | 2,000 | 1,123,160 | 5,990 | Jul 31 10:49 AM |
| CHE | Nicholas M. Westfall | Officer | Jul 30 '24 | Proposed Sale | 550.29 | 23,000 | 12,656,670 | Jul 30 11:36 AM | |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 16 '24 | Option Exercise | 586.49 | 785 | 460,395 | 8,461 | Feb 20 03:12 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 01 '23 | Option Exercise | 413.19 | 12,670 | 5,235,117 | 20,346 | Jun 05 03:10 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 01 '23 | Sale | 533.70 | 12,670 | 6,761,979 | 7,676 | Jun 05 03:10 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 01 '23 | Option Exercise | 413.19 | 1,330 | 549,543 | 7,676 | Jun 01 02:36 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 30 '23 | Sale | 540.34 | 1,330 | 718,652 | 6,346 | Jun 01 02:36 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 17 '23 | Option Exercise | 515.12 | 1,224 | 630,507 | 8,224 | Feb 22 03:10 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '22 | Option Exercise | 306.70 | 13,500 | 4,140,450 | 20,500 | Nov 04 03:15 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '22 | Sale | 477.19 | 13,500 | 6,442,065 | 7,000 | Nov 04 03:15 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 10 '22 | Sale | 500.10 | 1,432 | 716,143 | 7,000 | May 11 11:23 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 18 '22 | Option Exercise | 459.77 | 1,592 | 731,954 | 9,070 | Feb 23 11:42 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 04 '21 | Option Exercise | 231.91 | 5,594 | 1,297,305 | 7,478 | Nov 05 11:15 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 02 '21 | Sale | 490.15 | 1,418 | 695,033 | 6,060 | Nov 05 11:15 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '21 | Sale | 485.24 | 4,176 | 2,026,362 | 1,884 | Nov 05 11:15 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '20 | Option Exercise | 231.91 | 7,527 | 1,745,587 | 13,795 | Nov 05 10:58 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '20 | Sale | 490.65 | 7,527 | 3,693,123 | 6,268 | Nov 05 10:58 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 11 '21 | Option Exercise | 231.91 | 2,708 | 628,012 | 7,478 | Jun 11 12:57 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 09 '21 | Option Exercise | 231.91 | 1,482 | 343,691 | 2,481 | Jun 10 10:56 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 10 '21 | Option Exercise | 231.91 | 2,289 | 530,842 | 4,770 | Jun 10 10:56 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 08 '21 | Sale | 485.04 | 2,708 | 1,313,488 | 999 | Jun 10 10:56 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 04 '21 | Sale | 500.12 | 1,482 | 741,178 | 5,996 | Jun 08 04:11 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Jun 07 '21 | Sale | 488.55 | 2,289 | 1,118,291 | 3,707 | Jun 08 04:11 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 19 '21 | Option Exercise | 491.34 | 2,161 | 1,061,786 | 8,429 | Feb 23 03:31 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '20 | Option Exercise | 231.91 | 7,527 | 1,745,587 | 13,795 | Nov 05 02:05 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 03 '20 | Sale | 490.65 | 7,527 | 3,693,123 | 6,268 | Nov 05 02:05 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 08 '20 | Option Exercise | 135.85 | 11,895 | 1,615,936 | 18,163 | May 11 02:59 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 07 '20 | Option Exercise | 135.85 | 12,105 | 1,644,464 | 18,373 | May 11 02:59 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 07 '20 | Sale | 428.09 | 12,105 | 5,182,029 | 6,268 | May 11 02:59 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 08 '20 | Sale | 426.05 | 11,895 | 5,067,865 | 6,268 | May 11 02:59 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 21 '20 | Option Exercise | 487.90 | 2,486 | 1,212,919 | 7,355 | Feb 25 11:55 AM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 22 '19 | Option Exercise | 322.40 | 1,372 | 442,333 | 5,424 | Feb 25 03:15 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Dec 12 '18 | Option Exercise | 143.02 | 18,000 | 2,574,360 | 22,052 | Dec 12 03:04 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Dec 11 '18 | Sale | 301.75 | 5,709 | 1,722,691 | 16,343 | Dec 12 03:04 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 02 '18 | Option Exercise | 98.39 | 12,919 | 1,271,106 | 17,191 | May 04 12:31 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 02 '18 | Sale | 312.50 | 10,643 | 3,325,938 | 6,548 | May 04 12:31 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | May 03 '18 | Sale | 312.50 | 2,276 | 711,250 | 4,272 | May 04 12:31 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 16 '18 | Option Exercise | 256.29 | 1,299 | 332,921 | 4,650 | Feb 20 01:39 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 13 '17 | Option Exercise | 157.36 | 10,000 | 1,573,600 | 13,351 | Nov 14 01:01 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Nov 13 '17 | Sale | 231.00 | 10,000 | 2,310,000 | 3,351 | Nov 14 01:01 PM |
| CHE | Westfall Nicholas Michael | Executive Vice President | Feb 17 '17 | Option Exercise | 172.60 | 1,295 | 223,517 | 4,126 | Feb 21 09:28 AM |
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