The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 17, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Tax withholding(F) | 1K | $310.58 | $393K |
| Jul 1, 2026 | Gerstenberg Eric W | CO-CEO | Tax withholding(F) | 564 | $290.74 | $164K |
| Jul 1, 2026 | Geer Charles H. II | EVP, Industrial Services | Tax withholding(F) | 40 | $290.74 | $12K |
| Jul 1, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Tax withholding(F) | 447 | $290.74 | $130K |
| Jul 1, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Tax withholding(F) | 359 | $290.74 | $104K |
| Jul 1, 2026 | Weber Brian P | EVP (CHESI) | Tax withholding(F) | 814 | $290.74 | $237K |
| Jul 1, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Tax withholding(F) | 311 | $290.74 | $90K |
| Jul 1, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Tax withholding(F) | 1K | $290.74 | $390K |
| Jun 1, 2026 | Diderich Jeroen | EVP&President of Sales&Service | Tax withholding(F) | 2K | $281.00 | $482K |
| May 26, 2026 | States Lauren | Director | Sell(S) | 789 | $286.19 | $226K |
| May 20, 2026 | Galante Edward G | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Robertson Andrea | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Willett Robert | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Stewart Shelley JR | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Quirk Alison A. | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Preston John T | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | States Lauren | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Reed Marcy L. | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Polito Karyn | Director | Grant(A) | 652 | — | $0 |
| May 20, 2026 | Welch John R. | Director | Grant(A) | 652 | — | $0 |
| May 11, 2026 | Robertson Andrea | Director | Gift(G) | 342 | — | $0 |
| May 11, 2026 | Polito Karyn | Director | Buy(P) | 460 | $295.13 | $136K |
| Mar 18, 2026 | Gerstenberg Eric W | CO-CEO | Sell(S) | 1K | $293.00 | $293K |
| Mar 18, 2026 | Reed Marcy L. | Director | Sell(S) | 836 | $287.94 | $241K |
| Mar 17, 2026 | Weber Brian P | EVP (CHESI) | Sell(S) | 5K | $293.39 | $1.4M |
| Mar 13, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Tax withholding(F) | 1K | $288.93 | $365K |
| Mar 13, 2026 | Gerstenberg Eric W | CO-CEO | Tax withholding(F) | 977 | $288.93 | $282K |
| Mar 13, 2026 | Gerstenberg Eric W | CO-CEO | Disposed to issuer(D) | 2K | — | $0 |
| Mar 13, 2026 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Tax withholding(F) | 350 | $288.93 | $101K |
| Mar 13, 2026 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Disposed to issuer(D) | 1K | — | $0 |
| Mar 13, 2026 | Weber Brian P | EVP (CHESI) | Tax withholding(F) | 960 | $288.93 | $277K |
| Mar 13, 2026 | Weber Brian P | EVP (CHESI) | Disposed to issuer(D) | 2K | — | $0 |
| Mar 13, 2026 | Battles Michael Louis | CO-CEO, Director | Disposed to issuer(D) | 2K | — | $0 |
| Mar 13, 2026 | Battles Michael Louis | CO-CEO, Director | Tax withholding(F) | 1K | $288.93 | $332K |
| Mar 13, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Disposed to issuer(D) | 1K | — | $0 |
| Mar 13, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Tax withholding(F) | 630 | $288.93 | $182K |
| Mar 13, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Disposed to issuer(D) | 1K | — | $0 |
| Mar 13, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Tax withholding(F) | 727 | $288.93 | $210K |
| Mar 13, 2026 | Harrison Robert W. | EVP, EHS | Disposed to issuer(D) | 368 | — | $0 |
| Mar 13, 2026 | Harrison Robert W. | EVP, EHS | Tax withholding(F) | 18 | $288.93 | $5K |
| Mar 13, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Tax withholding(F) | 125 | $288.93 | $36K |
| Mar 13, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Disposed to issuer(D) | 1K | — | $0 |
| Mar 13, 2026 | Geer Charles H. II | EVP, Industrial Services | Disposed to issuer(D) | 139 | — | $0 |
| Mar 4, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Sell(S) | 100K | $292.65 | $29.3M |
| Feb 23, 2026 | Gerstenberg Eric W | CO-CEO | Sell(S) | 3K | $279.86 | $700K |
| Feb 20, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Sell(S) | 3K | $281.31 | $784K |
| Feb 20, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Sell(S) | 4K | $282.07 | $999K |
| Feb 19, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Gift(G) | 10K | — | $0 |
| Feb 19, 2026 | McKim Alan S | EXEC CHAIR, CTO., Director | Sell(S) | 100K | $281.14 | $28.1M |
| Feb 19, 2026 | Welch John R. | Director | Sell(S) | 750 | $273.07 | $205K |
| Feb 2, 2026 | Gerstenberg Eric W | CO-CEO | Tax withholding(F) | 5K | $259.91 | $1.3M |
| Feb 2, 2026 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Tax withholding(F) | 249 | $259.91 | $65K |
| Feb 2, 2026 | Weber Brian P | EVP (CHESI) | Tax withholding(F) | 1K | $259.91 | $362K |
| Feb 2, 2026 | Battles Michael Louis | CO-CEO, Director | Tax withholding(F) | 5K | $259.91 | $1.4M |
| Feb 2, 2026 | Diderich Jeroen | EVP&President of Sales&Service | Tax withholding(F) | 105 | $259.91 | $27K |
| Feb 2, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Tax withholding(F) | 567 | $259.91 | $147K |
| Feb 2, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Tax withholding(F) | 508 | $259.91 | $132K |
| Feb 2, 2026 | Harrison Robert W. | EVP, EHS | Tax withholding(F) | 184 | $259.91 | $48K |
| Feb 2, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Tax withholding(F) | 425 | $259.91 | $110K |
| Feb 2, 2026 | Geer Charles H. II | EVP, Industrial Services | Tax withholding(F) | 197 | $259.91 | $51K |
| Feb 1, 2026 | Gerstenberg Eric W | CO-CEO | Grant(A) | 11K | — | $0 |
| Feb 1, 2026 | Gerstenberg Eric W | CO-CEO | Grant(A) | 10K | — | $0 |
| Feb 1, 2026 | Weber Brian P | EVP (CHESI) | Grant(A) | 3K | — | $0 |
| Feb 1, 2026 | Weber Brian P | EVP (CHESI) | Grant(A) | 1K | — | $0 |
| Feb 1, 2026 | Battles Michael Louis | CO-CEO, Director | Grant(A) | 10K | — | $0 |
| Feb 1, 2026 | Battles Michael Louis | CO-CEO, Director | Grant(A) | 11K | — | $0 |
| Feb 1, 2026 | Diderich Jeroen | EVP&President of Sales&Service | Grant(A) | 3K | — | $0 |
| Feb 1, 2026 | Diderich Jeroen | EVP&President of Sales&Service | Grant(A) | 1K | — | $0 |
| Feb 1, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Grant(A) | 1K | — | $0 |
| Feb 1, 2026 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Grant(A) | 3K | — | $0 |
| Feb 1, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Grant(A) | 566 | — | $0 |
| Feb 1, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Grant(A) | 2K | — | $0 |
| Feb 1, 2026 | Harrison Robert W. | EVP, EHS | Grant(A) | 1K | — | $0 |
| Feb 1, 2026 | Harrison Robert W. | EVP, EHS | Grant(A) | 430 | — | $0 |
| Feb 1, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Grant(A) | 838 | — | $0 |
| Feb 1, 2026 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Grant(A) | 3K | — | $0 |
| Feb 1, 2026 | Geer Charles H. II | EVP, Industrial Services | Grant(A) | 503 | — | $0 |
| Feb 1, 2026 | Geer Charles H. II | EVP, Industrial Services | Grant(A) | 2K | — | $0 |
| Jan 2, 2026 | Gabriel Sharon M. | EVP/CIO (CHESI) | Tax withholding(F) | 525 | $234.48 | $123K |
| Dec 17, 2025 | Welch John R. | Director | Gift(G) | 415 | — | $0 |
| Dec 16, 2025 | Gerstenberg Eric W | CO-CEO | Sell(S) | 601 | $240.90 | $145K |
| Dec 15, 2025 | Harrison Robert W. | EVP, EHS | Tax withholding(F) | 16 | $240.71 | $4K |
| Dec 15, 2025 | Underwood Rebecca | PRESIDENT & EVP FACILITIES | Tax withholding(F) | 51 | $240.71 | $12K |
| Dec 15, 2025 | Geer Charles H. II | EVP, Industrial Services | Tax withholding(F) | 28 | $240.71 | $7K |
| Dec 9, 2025 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Gift(G) | 1K | — | $0 |
| Dec 1, 2025 | Harrison Robert W. | EVP, EHS | Tax withholding(F) | 122 | $228.54 | $28K |
| Nov 13, 2025 | States Lauren | Director | Gift(G) | 245 | — | $0 |
| Nov 1, 2025 | Geer Charles H. II | EVP, Industrial Services | Tax withholding(F) | 294 | $210.51 | $62K |
| Sep 16, 2025 | McKim Alan S | EXEC CHAIR, CTO., Director | Gift(G) | 4K | — | $0 |
| Sep 16, 2025 | McKim Alan S | EXEC CHAIR, CTO., Director | Gift(G) | 9K | — | $0 |
| Aug 5, 2025 | Robertson Andrea | Director | Gift(G) | 430 | — | $0 |
| Aug 1, 2025 | Battles Michael Louis | CO-CEO, Director | Buy(P) | 2K | $233.50 | $467K |
| Jul 31, 2025 | Robertson Andrea | Director | Sell(S) | 836 | $233.64 | $195K |
| Jul 1, 2025 | McKim Alan S | EXEC CHAIR, CTO., Director | Tax withholding(F) | 1K | $229.55 | $308K |
| Jul 1, 2025 | Dugas Eric J. | EVP CHIEF FINANCIAL OFFICER | Tax withholding(F) | 613 | $229.55 | $141K |
| Jul 1, 2025 | Weber Brian P | EVP (CHESI) | Tax withholding(F) | 1K | $229.55 | $261K |
| Jul 1, 2025 | Gabriel Sharon M. | EVP/CIO (CHESI) | Tax withholding(F) | 525 | $229.55 | $121K |
| Jul 1, 2025 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Tax withholding(F) | 399 | $229.55 | $92K |
| Jul 1, 2025 | Gerstenberg Eric W | CO-CEO | Tax withholding(F) | 564 | $229.55 | $129K |
| Jul 1, 2025 | Battles Michael Louis | CO-CEO, Director | Tax withholding(F) | 2K | $229.55 | $352K |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2021-01-04 → 2026-07-20. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).