John Edward Williams
Insider
First SEC filing: May 15, 2024 · Latest: May 15, 2024
Insider at
Insider transactions
0 buys (P)
2 sells (S)
Net: $-655,604
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 3, 2026 | MKSI | S 10b5-1 | 457 | $288.31 | $131,758 | 4,098 Direct | -10.03% | Disposed | -3.2% (price as of 2026-10-02) |
| April 17, 2026 | MKSI | M | 1,741 | · | · | 6,812 Direct | -20.36% | Disposed | (price as of 2026-10-02) |
| April 17, 2026 | MKSI | F | 826 | $269.89 | $222,929 | 4,555 Direct | -15.35% | Disposed | 3.4% (price as of 2026-10-02) |
| April 17, 2026 | MKSI | M | 1,741 | · | · | 5,381 Direct | +47.83% | Acquired | (price as of 2026-10-02) |
| Feb. 20, 2026 | MKSI | S | 2,043 | $256.41 | $523,846 | 3,640 Direct | -35.95% | Disposed | 8.9% (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 1,106 | · | · | 8,553 Direct | -11.45% | Disposed | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 991 | · | · | 9,659 Direct | -9.31% | Disposed | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 841 | · | · | 10,649 Direct | -7.32% | Disposed | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 300 | · | · | 11,490 Direct | -2.54% | Disposed | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | A | 1,474 | · | · | 11,791 Direct | +14.29% | Acquired | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | F | 1,195 | $260.74 | $311,584 | 5,683 Direct | -17.37% | Disposed | 7.1% (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 1,106 | · | · | 6,878 Direct | +19.16% | Acquired | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 991 | · | · | 5,772 Direct | +20.73% | Acquired | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 841 | · | · | 4,781 Direct | +21.35% | Acquired | (price as of 2026-10-02) |
| Feb. 17, 2026 | MKSI | M | 300 | · | · | 3,940 Direct | +8.24% | Acquired | (price as of 2026-10-02) |
| Feb. 8, 2026 | MKSI | A | 2,973 | · | · | 10,317 Direct | +40.48% | Acquired | (price as of 2026-10-02) |
| Aug. 15, 2025 | MKSI | M | 947 | · | · | 7,344 Direct | -11.42% | Disposed | (price as of 2026-10-02) |
| Aug. 15, 2025 | MKSI | F | 308 | $104.73 | $32,257 | 3,640 Direct | -7.80% | Disposed | 166.5% (price as of 2026-10-02) |
| Aug. 15, 2025 | MKSI | M | 947 | · | · | 3,948 Direct | +31.56% | Acquired | (price as of 2026-10-02) |
| April 17, 2025 | MKSI | M | 1,740 | · | · | 8,291 Direct | -17.35% | Disposed | (price as of 2026-10-02) |
| April 17, 2025 | MKSI | F | 565 | $63.69 | $35,985 | 3,001 Direct | -15.84% | Disposed | 338.3% (price as of 2026-10-02) |
| April 17, 2025 | MKSI | M | 1,740 | · | · | 3,566 Direct | +95.29% | Acquired | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 841 | · | · | 10,031 Direct | -7.74% | Disposed | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 300 | · | · | 10,872 Direct | -2.69% | Disposed | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 658 | · | · | 11,172 Direct | -5.56% | Disposed | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 915 | · | · | 11,830 Direct | -7.18% | Disposed | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | A | 3,318 | · | · | 12,745 Direct | +35.20% | Acquired | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | F | 901 | $103.67 | $93,407 | 1,826 Direct | -33.04% | Disposed | 169.3% (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 841 | · | · | 2,727 Direct | +44.59% | Acquired | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 300 | · | · | 1,886 Direct | +18.92% | Acquired | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 658 | · | · | 1,586 Direct | +70.91% | Acquired | (price as of 2026-10-02) |
| Feb. 18, 2025 | MKSI | M | 915 | · | · | 928 Direct | +7038.46% | Acquired | (price as of 2026-10-02) |
| Feb. 10, 2025 | MKSI | A | 901 | · | · | 9,426 Direct | +10.57% | Acquired | (price as of 2026-10-02) |
| Aug. 16, 2024 | MKSI | S | 1,800 | $118.71 | $213,678 | 13 Direct | -99.28% | Disposed | 135.2% (price as of 2026-10-02) |
| Aug. 15, 2024 | MKSI | M | 946 | · | · | 8,525 Direct | -9.99% | Disposed | (price as of 2026-10-02) |
| Aug. 15, 2024 | MKSI | F | 307 | $113.91 | $34,970 | 1,813 Direct | -14.48% | Disposed | 145.1% (price as of 2026-10-02) |
| Aug. 15, 2024 | MKSI | M | 946 | · | · | 2,120 Direct | +80.58% | Acquired | (price as of 2026-10-02) |
| May 15, 2024 | MKSI | A | 2,524 | · | · | 9,471 Direct | +36.33% | Acquired | (price as of 2026-10-02) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| April 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 1,741 | Disposed |
| Feb. 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 1,106 | Disposed |
| Feb. 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 991 | Disposed |
| Feb. 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 841 | Disposed |
| Feb. 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 300 | Disposed |
| Feb. 17, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 1,474 | Acquired |
| Feb. 8, 2026 | MKSI | Restricted Stock Unit | Common Stock | · | · | 2,973 | Acquired |
| Aug. 15, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 947 | Disposed |
| April 17, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 1,740 | Disposed |
| Feb. 18, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 841 | Disposed |
| Feb. 18, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 300 | Disposed |
| Feb. 18, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 658 | Disposed |
| Feb. 18, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 915 | Disposed |
| Feb. 18, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 3,318 | Acquired |
| Feb. 10, 2025 | MKSI | Restricted Stock Unit | Common Stock | · | · | 901 | Acquired |
| Aug. 15, 2024 | MKSI | Restricted Stock Unit | Common Stock | · | · | 946 | Disposed |
| May 15, 2024 | MKSI | Restricted Stock Unit | Common Stock | · | · | 2,524 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.