Bay Walter D., General Counsel of Arthur J. Gallagher & Co. ($AJG), made one open market sale of company shares in the last year, totaling $4.04 million. The most recent transaction occurred on December 19, 2025. This activity ranks 2239th out of 11,678 insiders in our database, compared to an average sale value of $8.59 million across 6.37 transactions per insider. Bay Walter D. reported no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 31, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 627 | $215.95 | 83,783.2210 | 257,100,000 | 0.74% | 0.00% |
| March 31, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Phantom Stock | 1415 | $0.00 | 3,994.7340 | 257,100,000 | 26.16% | 0.00% |
| March 31, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 1415 | $215.95 | 84,410.2210 | 257,100,000 | 1.71% | 0.00% |
| March 15, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 7090 | $0.00 | 0.0000 | 257,100,000 | 100.00% | 0.00% |
| March 15, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Common Stock (restricted) | 7090 | $0.00 | 7,090.0000 | 257,100,000 | 9999.99% | 0.00% |
| March 15, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 2411 | $207.93 | 75,905.1290 | 257,100,000 | 3.08% | 0.00% |
| March 15, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 7090 | $0.00 | 82,995.1290 | 257,100,000 | 9.34% | 0.00% |
| March 4, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Phantom Stock | 1982 | $227.01 | 5,399.1000 | 257,100,000 | 58.02% | 0.00% |
| March 1, 2026 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Non-qualified Stock Option | 16952 | $0.00 | 16,952.0000 | 257,100,000 | 9999.99% | 0.01% |
| Dec. 19, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 15850 | $79.59 | 95,817.6890 | 256,800,000 | 19.82% | 0.01% |
| Dec. 19, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 15850 | $255.00 | 79,967.6890 | 256,800,000 | 16.54% | 0.01% |
| Dec. 19, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | G | Common Stock | 1724 | $0.00 | 78,243.6890 | 256,800,000 | 2.16% | 0.00% |
| Dec. 19, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Non-qualified Stock Option | 15850 | $0.00 | 85,221.0000 | 256,800,000 | 15.68% | 0.01% |
| March 31, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 79 | $345.24 | 79,888.9340 | 254,700,000 | 0.10% | 0.00% |
| March 31, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 79 | $0.00 | 79,967.6890 | 254,700,000 | 0.10% | 0.00% |
| March 31, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Phantom Stock | 79 | $0.00 | 3,395.1520 | 254,700,000 | 2.27% | 0.00% |
| March 15, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 7180 | $0.00 | 0.0000 | 254,700,000 | 100.00% | 0.00% |
| March 15, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Common Stock (restricted) | 7180 | $0.00 | 7,180.0000 | 254,700,000 | 9999.99% | 0.00% |
| March 15, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 7180 | $0.00 | 83,024.5420 | 254,700,000 | 9.47% | 0.00% |
| March 15, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 3108 | $325.24 | 79,916.5420 | 254,700,000 | 3.74% | 0.00% |
| March 12, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 2250 | $0.00 | 0.0000 | 254,700,000 | 100.00% | 0.00% |
| March 12, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 2250 | $0.00 | 76,789.5420 | 254,700,000 | 3.02% | 0.00% |
| March 12, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 945 | $325.75 | 75,844.5420 | 254,700,000 | 1.23% | 0.00% |
| March 10, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | I | Phantom Stock | 1401 | $321.23 | 3,470.2640 | 254,700,000 | 67.69% | 0.00% |
| March 1, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Non-qualified Stock Option | 11350 | $0.00 | 11,350.0000 | 254,700,000 | 9999.99% | 0.00% |
| Feb. 13, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 10000 | $326.62 | 74,539.5420 | 254,700,000 | 11.83% | 0.00% |
| Feb. 5, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 40613 | $316.30 | 84,539.5420 | 254,700,000 | 32.45% | 0.02% |
| Feb. 5, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 94732 | $0.00 | 125,152.3830 | 254,700,000 | 311.41% | 0.04% |
| Feb. 5, 2025 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Phantom Stock | 94732 | $0.00 | 2,069.3980 | 254,700,000 | 97.86% | 0.04% |
| Dec. 10, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | I | Notional Stock Units | 4942 | $283.74 | 4,942.4000 | 0 | 9999.99% | 0.00% |
| July 30, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 6335 | $284.06 | 30,420.5790 | 0 | 17.24% | 0.00% |
| June 18, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 8303 | $262.74 | 36,755.5790 | 0 | 18.43% | 0.00% |
| June 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | I | Notional Stock Units | 9675 | $261.16 | 0.0000 | 0 | 100.00% | 0.00% |
| May 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 386 | $258.11 | 45,058.5790 | 0 | 0.85% | 0.00% |
| May 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 7576 | $253.00 | 52,341.5790 | 0 | 12.64% | 0.00% |
| May 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 7283 | $70.74 | 59,917.5790 | 0 | 13.84% | 0.00% |
| May 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 7283 | $256.04 | 45,058.5790 | 0 | 13.91% | 0.00% |
| May 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 8717 | $70.74 | 53,775.5790 | 0 | 19.35% | 0.00% |
| May 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 3863 | $256.27 | 49,912.5790 | 0 | 7.18% | 0.00% |
| May 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 4468 | $257.53 | 45,444.5790 | 0 | 8.95% | 0.00% |
| May 20, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 800 | $70.74 | 45,858.5790 | 0 | 1.78% | 0.00% |
| May 20, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 800 | $257.24 | 45,058.5790 | 0 | 1.74% | 0.00% |
| May 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Non-qualified Stock Option | 7283 | $0.00 | 9,517.0000 | 0 | 43.35% | 0.00% |
| May 17, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Non-qualified Stock Option | 8717 | $0.00 | 800.0000 | 0 | 91.59% | 0.00% |
| May 20, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Non-qualified Stock Option | 800 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| March 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 8914 | $0.00 | 2,250.0000 | 0 | 79.85% | 0.00% |
| March 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 3858 | $253.17 | 52,634.5790 | 0 | 6.83% | 0.00% |
| March 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 8914 | $0.00 | 56,492.5790 | 0 | 18.74% | 0.00% |
| March 16, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Common Stock (restricted) | 8914 | $0.00 | 11,164.0000 | 0 | 396.18% | 0.00% |
| March 14, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 3500 | $0.00 | 48,558.5790 | 0 | 7.77% | 0.00% |
| March 14, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 3500 | $0.00 | 2,250.0000 | 0 | 60.87% | 0.00% |
| March 14, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 980 | $254.91 | 47,578.5790 | 0 | 2.02% | 0.00% |
| March 4, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | I | Phantom Stock | 1851 | $243.13 | 95,742.9990 | 0 | 1.97% | 0.00% |
| March 1, 2024 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Non-qualified Stock Option | 10884 | $0.00 | 10,884.0000 | 0 | 9999.99% | 0.00% |
| Sept. 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 21800 | $56.86 | 66,784.4700 | 0 | 48.46% | 0.00% |
| Sept. 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | S | Common Stock | 21800 | $232.00 | 44,984.4700 | 0 | 32.64% | 0.00% |
| Sept. 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Non-qualified Stock Option | 21800 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| March 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 4000 | $0.00 | 5,750.0000 | 0 | 41.03% | 0.00% |
| March 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Non-qualified Stock Option | 9452 | $0.00 | 9,452.0000 | 0 | 9999.99% | 0.00% |
| March 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 1773 | $177.09 | 44,905.6300 | 0 | 3.80% | 0.00% |
| March 15, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 4000 | $0.00 | 46,678.6300 | 0 | 9.37% | 0.00% |
| March 12, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock (restricted) | 9800 | $0.00 | 9,750.0000 | 0 | 50.13% | 0.00% |
| March 12, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | A | Common Stock (restricted) | 9800 | $0.00 | 19,550.0000 | 0 | 100.51% | 0.00% |
| March 10, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | I | Phantom Stock | 3630 | $185.95 | 92,933.0740 | 0 | 4.06% | 0.00% |
| March 12, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | F | Common Stock | 3530 | $182.76 | 42,678.6300 | 0 | 7.64% | 0.00% |
| March 12, 2023 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | M | Common Stock | 9800 | $0.00 | 46,208.6300 | 0 | 26.92% | 0.00% |
| Dec. 29, 2022 | Arthur J. Gallagher & Co. | $AJG | Bay Walter D. | General Counsel | G | Common Stock | 2023 | $0.00 | 36,408.6300 | 0 | 5.26% | 0.00% |