John Edward Williams, EVP and GM of PSD at MKS Instruments ($MKSI), sold shares once on the open market in the last year, totaling about $524 thousand. His most recent sale occurred on February 20, 2026. These sales rank 6,328th among 11,678 individual insiders by value, below the average of $8.6 million per seller across 6.4 transactions on average. Williams made 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb. 20, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | S | Common Stock | 2043 | $256.41 | 3,640.0990 | 67,600,000 | 35.94% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 300 | $0.00 | 3,940.4890 | 67,600,000 | 8.25% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 991 | $0.00 | 5,772.2090 | 67,600,000 | 20.72% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 841 | $0.00 | 4,781.4890 | 67,600,000 | 21.34% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 1106 | $0.00 | 8,552.7170 | 67,600,000 | 11.45% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 991 | $0.00 | 9,658.7170 | 67,600,000 | 9.30% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 841 | $0.00 | 10,649.4370 | 67,600,000 | 7.32% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 300 | $0.00 | 11,490.4370 | 67,600,000 | 2.55% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | A | Restricted Stock Unit | 1474 | $0.00 | 11,790.8270 | 67,600,000 | 14.28% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | F | Common Stock | 1195 | $260.74 | 5,682.7240 | 67,600,000 | 17.38% | 0.00% |
| Feb. 17, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 1106 | $0.00 | 6,878.2090 | 67,600,000 | 19.16% | 0.00% |
| Feb. 8, 2026 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | A | Restricted Stock Unit | 2973 | $0.00 | 10,317.1070 | 67,600,000 | 40.49% | 0.00% |
| Aug. 15, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 947 | $0.00 | 3,948.0990 | 67,600,000 | 31.57% | 0.00% |
| Aug. 15, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | F | Common Stock | 308 | $104.73 | 3,640.0990 | 67,600,000 | 7.80% | 0.00% |
| Aug. 15, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 947 | $0.00 | 7,343.7500 | 67,600,000 | 11.43% | 0.00% |
| April 17, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 1740 | $0.00 | 8,291.0350 | 67,600,000 | 17.35% | 0.00% |
| April 17, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 1740 | $0.00 | 3,565.8140 | 67,600,000 | 95.30% | 0.00% |
| April 17, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | F | Common Stock | 565 | $63.69 | 3,000.8140 | 67,600,000 | 15.84% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 915 | $0.00 | 11,829.9460 | 67,600,000 | 7.18% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | A | Restricted Stock Unit | 3318 | $0.00 | 12,744.8490 | 67,600,000 | 35.20% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | F | Common Stock | 901 | $103.67 | 1,825.8140 | 67,600,000 | 33.04% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 841 | $0.00 | 2,726.8140 | 67,600,000 | 44.60% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 300 | $0.00 | 1,885.8140 | 67,600,000 | 18.91% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 658 | $0.00 | 1,585.9340 | 67,600,000 | 70.92% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 915 | $0.00 | 927.9030 | 67,600,000 | 7037.72% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 300 | $0.00 | 10,872.0350 | 67,600,000 | 2.68% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 658 | $0.00 | 11,171.9150 | 67,600,000 | 5.56% | 0.00% |
| Feb. 18, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 841 | $0.00 | 10,031.0350 | 67,600,000 | 7.74% | 0.00% |
| Feb. 10, 2025 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | A | Restricted Stock Unit | 901 | $0.00 | 9,426.3700 | 67,600,000 | 10.57% | 0.00% |
| Aug. 16, 2024 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | S | Common Stock | 1800 | $118.71 | 13.0000 | 66,800,000 | 99.28% | 0.00% |
| Aug. 15, 2024 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | F | Common Stock | 307 | $113.91 | 1,813.0000 | 66,800,000 | 14.48% | 0.00% |
| Aug. 15, 2024 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Restricted Stock Unit | 946 | $0.00 | 8,525.2050 | 66,800,000 | 9.99% | 0.00% |
| Aug. 15, 2024 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | M | Common Stock | 946 | $0.00 | 2,120.0000 | 66,800,000 | 80.58% | 0.00% |
| May 15, 2024 | MKS INC | $MKSI | Williams John Edward | EVP & GM, PSD | A | Restricted Stock Unit | 2524 | $0.00 | 9,471.2050 | 66,800,000 | 36.34% | 0.00% |