William M. Lambert serves as Executive at MINE SAFETY APPLIANCES CO, where they oversee executive responsibilities. Since joining the company, William M. Lambert has executed 238 insider transactions totaling $86.8M, demonstrating a bearish approach to their equity position. Their most recent transaction on Feb 18, 2026 involved exercising options for 14,000 shares valued at $0.
William M. Lambert currently holds 76,992 shares of MINE SAFETY APPLIANCES CO (MSA), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, William M. Lambert has been a net seller of MSA stock. They have purchased $1.2M and sold $85.6M worth of shares.
William M. Lambert's most recent insider trade was on Feb 18, 2026, when they sold 14,000 shares at $0.00 per share.
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| $39.04 |
| Discretionary |
| Feb 18, 2026 | KMT | $292.2K | Option Exercise | 14,000 | $20.87 | Discretionary |
| Dec 12, 2025 | MSA | $0 | Gift | 9,634 | $N/A | Discretionary |
| Aug 15, 2025 | KMT | $3.6K | Payment | 170 | $21.02 | Discretionary |
| Aug 15, 2025 | KMT | $117.0K | Option Exercise | 5,566 | $21.02 | Discretionary |
| Aug 15, 2024 | KMT | $3.6K | Payment | 145 | $25.00 | Discretionary |
| Aug 15, 2024 | KMT | $119.2K | Option Exercise | 4,766 | $25.00 | Discretionary |
| May 15, 2024 | MSA | $0 | Award | 755 | $N/A | Discretionary |
| Nov 27, 2023 | MSA | $0 | Gift | 3,000 | $N/A | Discretionary |
| Aug 15, 2023 | KMT | $3.4K | Payment | 129 | $25.99 | Discretionary |
| Aug 15, 2023 | KMT | $110.5K | Option Exercise | 4,252 | $25.99 | Discretionary |
| May 17, 2023 | MSA | $0 | Award | 939 | $N/A | Discretionary |
| May 11, 2023 | MSA | $0 | Gift | 1,111 | $N/A | Discretionary |
| Nov 15, 2022 | MSA | $0 | Gift | 2,400 | $N/A | Discretionary |
| Nov 15, 2022 | MSA | $0 | Gift | 2,400 | $N/A | Discretionary |
| Aug 15, 2022 | KMT | $108.5K | Option Exercise | 3,977 | $27.27 | Discretionary |
| Aug 10, 2022 | MSA | $88.0K | Sale | 700 | $125.72 | Discretionary |
| Aug 10, 2022 | MSA | $2.4M | Option Exercise | 53,149 | $44.50 | Discretionary |
| Aug 10, 2022 | MSA | $1.1M | Sale | 8,922 | $128.26 | Discretionary |
| Aug 10, 2022 | MSA | $1.2M | Sale | 9,642 | $127.39 | Discretionary |
| Aug 10, 2022 | MSA | $4.3M | Sale | 33,885 | $126.60 | Discretionary |
| Aug 9, 2022 | MSA | $1.3M | Option Exercise | 28,767 | $44.50 | Discretionary |
| Aug 9, 2022 | MSA | $70.1K | Sale | 551 | $127.29 | Discretionary |
| Aug 9, 2022 | MSA | $3.6M | Sale | 28,216 | $126.09 | Discretionary |
| Aug 8, 2022 | MSA | $0 | Gift | 750 | $N/A | Discretionary |
| May 18, 2022 | MSA | $0 | Award | 1,129 | $N/A | Discretionary |
| May 4, 2022 | KMT | $962.6K | Purchase | 36,698 | $26.23 | Discretionary |
| Nov 22, 2021 | MSA | $247.1K | Option Exercise | 5,080 | $48.64 | Discretionary |
| Nov 22, 2021 | MSA | $78.1K | Sale | 500 | $156.16 | Discretionary |