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 |
|---|---|---|---|---|---|---|
| May 7, 2026 | Carson Molly R. | Director | Grant(A) | 1K | — | $0 |
| May 7, 2026 | Kim Leezie | Director | Grant(A) | 1K | — | $0 |
| Feb 27, 2026 | Forsberg Justin S | SVP/Chief Financial Officer | Tax withholding(F) | 520 | $80.02 | $42K |
| Feb 27, 2026 | Gabe Randall P. | SVP/Chief Administrative OFC | Tax withholding(F) | 2K | $80.02 | $174K |
| Feb 27, 2026 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 3K | $87.60 | $281K |
| Feb 27, 2026 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 7K | $80.02 | $547K |
| Feb 27, 2026 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Tax withholding(F) | 544 | $80.02 | $44K |
| Feb 27, 2026 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Tax withholding(F) | 3K | $80.02 | $278K |
| Feb 27, 2026 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Tax withholding(F) | 1K | $80.02 | $95K |
| Feb 27, 2026 | Haller Karen S | President and CEO | Tax withholding(F) | 13K | $80.02 | $1.0M |
| Feb 22, 2026 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 8K | — | $0 |
| Feb 19, 2026 | Ruisanchez Carlos | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Sandoval Brian E | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Grant(A) | 3K | — | $0 |
| Feb 19, 2026 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Grant(A) | 9K | — | $0 |
| Feb 19, 2026 | Thornton Leslie T | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Sharma Ruby | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Grant(A) | 4K | — | $0 |
| Feb 19, 2026 | Forsberg Justin S | SVP/Chief Financial Officer | Grant(A) | 4K | — | $0 |
| Feb 19, 2026 | Forsberg Justin S | SVP/Chief Financial Officer | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Haller Karen S | President and CEO | Grant(A) | 33K | — | $0 |
| Feb 19, 2026 | Haller Karen S | President and CEO | Grant(A) | 17K | — | $0 |
| Feb 19, 2026 | Conley E Renae | Director | Grant(A) | 3K | — | $0 |
| Feb 19, 2026 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 6K | — | $0 |
| Feb 19, 2026 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 17K | — | $0 |
| Feb 19, 2026 | Mariucci Anne L | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Pineda Fabio A | VP/Controller/CAO | Grant(A) | 1K | — | $0 |
| Feb 19, 2026 | Linginfelter Henry P | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Grant(A) | 3K | — | $0 |
| Feb 19, 2026 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Grant(A) | 4K | — | $0 |
| Feb 19, 2026 | Lewis-Raymond Jane | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Evans Andrew W | Director | Grant(A) | 2K | — | $0 |
| Feb 19, 2026 | Gabe Randall P. | SVP/Chief Administrative OFC | Grant(A) | 6K | — | $0 |
| Feb 19, 2026 | Gabe Randall P. | SVP/Chief Administrative OFC | Grant(A) | 2K | — | $0 |
| Jan 9, 2026 | Brown Justin L | President/Southwest Gas Corp. | Sell(S) | 3K | $81.08 | $246K |
| Jan 8, 2026 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 3K | $80.15 | $206K |
| Jan 8, 2026 | Haller Karen S | President and CEO | Tax withholding(F) | 8K | $80.15 | $612K |
| Jan 8, 2026 | Pineda Fabio A | VP/Controller/CAO | Tax withholding(F) | 250 | $80.15 | $20K |
| Jan 8, 2026 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Tax withholding(F) | 1K | $80.15 | $102K |
| Jan 8, 2026 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Tax withholding(F) | 864 | $80.15 | $69K |
| Jan 8, 2026 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Tax withholding(F) | 737 | $80.15 | $59K |
| Jan 8, 2026 | Forsberg Justin S | SVP/Chief Financial Officer | Tax withholding(F) | 408 | $80.15 | $33K |
| Jan 8, 2026 | Gabe Randall P. | SVP/Chief Administrative OFC | Tax withholding(F) | 1K | $80.15 | $83K |
| Nov 25, 2025 | Stefani Robert J | SVP/Chief Financial Officer | Tax withholding(F) | 4K | $80.44 | $361K |
| Sep 25, 2025 | Icahn Carl C | 10% Owner | Sell(S) | 1.5M | $77.91 | $116.9M |
| Sep 10, 2025 | Sandoval Brian E | Director | Buy(P) | 24 | $78.57 | $2K |
| Sep 5, 2025 | Haller Karen S | President and CEO | Tax withholding(F) | 17K | $78.60 | $1.3M |
| Sep 5, 2025 | Haller Karen S | President and CEO | Grant(A) | 42K | — | $0 |
| Sep 5, 2025 | Stefani Robert J | SVP/CFO/Controller | Grant(A) | 13K | — | $0 |
| Sep 5, 2025 | Stefani Robert J | SVP/CFO/Controller | Tax withholding(F) | 5K | $78.60 | $384K |
| Jul 17, 2025 | Pineda Fabio A | VP/Controller/CAO | Grant(A) | 1K | — | $0 |
| Jun 27, 2025 | Stefani Robert J | SVP/CFO/Controller | Sell(S) | 7K | $75.00 | $525K |
| May 1, 2025 | Sandoval Brian E | Director | Grant(A) | 2K | — | $0 |
| Mar 28, 2025 | Stefani Robert J | SVP/Chief Financial Officer | Sell(S) | 2K | $72.55 | $145K |
| Mar 24, 2025 | Icahn Carl C | 10% Owner | Sell(S) | 2.1M | $74.60 | $156.7M |
| Mar 5, 2025 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 3K | $76.89 | $247K |
| Mar 4, 2025 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 2K | $70.71 | $110K |
| Mar 4, 2025 | Gabe Randall P. | SVP/Chief Administrative OFC | Tax withholding(F) | 467 | $70.71 | $33K |
| Mar 4, 2025 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Tax withholding(F) | 254 | $70.71 | $18K |
| Mar 4, 2025 | Haller Karen S | President and CEO | Tax withholding(F) | 5K | $70.71 | $383K |
| Mar 4, 2025 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Tax withholding(F) | 289 | $70.71 | $20K |
| Mar 4, 2025 | Colvin Lori L | VP/Controller/CAO | Tax withholding(F) | 424 | $70.71 | $30K |
| Mar 4, 2025 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Tax withholding(F) | 239 | $70.71 | $17K |
| Feb 24, 2025 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 8K | — | $0 |
| Feb 20, 2025 | Thornton Leslie T | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Sharma Ruby | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Grant(A) | 3K | — | $0 |
| Feb 20, 2025 | Timperley Amy L. | SVP/Chief Reg. & Public Aff. | Grant(A) | 982 | — | $0 |
| Feb 20, 2025 | Teno Andrew | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Lewis-Raymond Jane | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Conley E Renae | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Grant(A) | 4K | — | $0 |
| Feb 20, 2025 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Grant(A) | 1K | — | $0 |
| Feb 20, 2025 | Linginfelter Henry P | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 6K | — | $0 |
| Feb 20, 2025 | Brown Justin L | President/Southwest Gas Corp. | Grant(A) | 4K | — | $0 |
| Feb 20, 2025 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Grant(A) | 733 | — | $0 |
| Feb 20, 2025 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Grant(A) | 3K | — | $0 |
| Feb 20, 2025 | Thoman A. Randall | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Ruisanchez Carlos | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Mariucci Anne L | Director | Grant(A) | 2K | — | $0 |
| Feb 20, 2025 | Colvin Lori L | VP/Controller/CAO | Grant(A) | 1K | — | $0 |
| Feb 20, 2025 | Colvin Lori L | VP/Controller/CAO | Grant(A) | 1K | — | $0 |
| Feb 20, 2025 | Stefani Robert J | SVP/Chief Financial Officer | Grant(A) | 6K | — | $0 |
| Feb 20, 2025 | Haller Karen S | President and CEO | Grant(A) | 19K | — | $0 |
| Feb 20, 2025 | Haller Karen S | President and CEO | Grant(A) | 14K | — | $0 |
| Feb 20, 2025 | Gabe Randall P. | SVP/Chief Administrative OFC | Grant(A) | 3K | — | $0 |
| Feb 20, 2025 | Gabe Randall P. | SVP/Chief Administrative OFC | Grant(A) | 1K | — | $0 |
| Feb 20, 2025 | Evans Andrew W | Director | Grant(A) | 2K | — | $0 |
| Jan 13, 2025 | Mazzeo Catherine M | SVP/Chief Legal/Comp. Officer | Tax withholding(F) | 408 | $71.43 | $29K |
| Jan 13, 2025 | Brown Justin L | President/Southwest Gas Corp. | Tax withholding(F) | 2K | $71.34 | $144K |
| Jan 13, 2025 | Williams Julie M. | SVP/Cont. Improvement and Opt. | Tax withholding(F) | 1K | $71.34 | $74K |
| Jan 13, 2025 | Stefani Robert J | SVP/Chief Financial Officer | Tax withholding(F) | 2K | $71.34 | $149K |
| Jan 13, 2025 | Colvin Lori L | VP/Controller/CAO | Tax withholding(F) | 492 | $71.34 | $35K |
| Jan 13, 2025 | Haller Karen S | President and CEO | Tax withholding(F) | 7K | $71.34 | $494K |
| Jan 13, 2025 | Timperley Amy L. | SVP/Chief Reg. & Fin. Planning | Tax withholding(F) | 622 | $71.34 | $44K |
| Jan 13, 2025 | Gabe Randall P. | SVP/Chief Administrative OFC | Tax withholding(F) | 852 | $71.34 | $61K |
| Nov 27, 2024 | Stefani Robert J | SVP/Chief Financial Officer | Tax withholding(F) | 4K | $77.47 | $336K |
| Nov 19, 2024 | Icahn Partners LP | 10% Owner | Sell(S) | 1.4M | $76.74 | $106.7M |
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 2021-03-29 → 2026-07-14. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).