John Edward Williams

John Edward Williams: EVP & GM, PSD at MKS. What John Edward Williams holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.

MKS (MKSI)

John Edward Williams holds 4,098 MKS shares (0.01% of the company), worth about $865,136.83 at the last price, according to the Form 4 of Aug 3, 2026.

• Shares held: 4,098 (0.01%), $865,136.83 — Held in their own name.
• Share units: 6,812 (0.01%), $1.4M — MKS promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.

Declarations

• MKS (MKSI) — Form 4 of Aug 3, 2026 (EVP & GM, PSD): open-market sale of 457 at $288.31; 4,098 shares after 0001049502-26-000111
• MKS (MKSI) — Form 4 of Apr 17, 2026 (EVP & GM, PSD): option exercise or conversion of 1,741; shares withheld for tax of 826 at $269.89; 4,555 shares after 0001049502-26-000061
• MKS (MKSI) — Form 4 of Feb 20, 2026 (EVP & GM, PSD): open-market sale of 2,043 at $256.41; 3,640 shares after 0001049502-26-000034
• MKS (MKSI) — Form 4 of Feb 17, 2026 (EVP & GM, PSD): option exercise or conversion of 300; option exercise or conversion of 841; 5,683 shares after 0001049502-26-000022
• MKS (MKSI) — Form 4 of Feb 8, 2026 (EVP & GM, PSD) 0001049502-26-000008
• MKS (MKSI) — Form 4 of Aug 15, 2025 (EVP & GM, PSD): option exercise or conversion of 947; shares withheld for tax of 308 at $104.73; 3,640 shares after 0001049502-25-000021
• MKS (MKSI) — Form 4 of Apr 17, 2025 (EVP & GM, PSD): option exercise or conversion of 1,740; shares withheld for tax of 565 at $63.69; 3,001 shares after 0001127602-25-012375
• MKS (MKSI) — Form 4 of Feb 18, 2025 (EVP & GM, PSD): option exercise or conversion of 915; option exercise or conversion of 658; 1,826 shares after 0001127602-25-005655
• MKS (MKSI) — Form 4 of Feb 10, 2025 (EVP & GM, PSD) 0001127602-25-004225
• MKS (MKSI) — Form 4 of Aug 16, 2024 (EVP & GM, PSD): open-market sale of 1,800 at $118.71; 13 shares after 0001127602-24-022410
• MKS (MKSI) — Form 4 of Aug 15, 2024 (EVP & GM, PSD): option exercise or conversion of 946; shares withheld for tax of 307 at $113.91; 1,813 shares after 0001127602-24-022323

Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.

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