Ronald C. Foster

Ronald C. Foster: Director at Advanced Energy Industries. What Ronald C. Foster 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.

Advanced Energy Industries (AEIS)

Ronald C. Foster holds 43,513 Advanced Energy Industries shares (0.11% of the company), worth about $12.5M at the last price, according to the Form 4 of May 2, 2026.

• Shares held: 18,425 (0.05%), $5.3M — Held through trusts (By Self As Trustee).
• Shares held: 18,425 (0.05%), $5.3M — Held by a spouse or a family member (By Spouse As Trustee).
• Shares held: 6,663 (0.02%), $1.9M — Held in their own name.
• Share units: 587 (0.00%), $168,389.76 — Advanced Energy Industries promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.

Declarations

• Advanced Energy Industries (AEIS) — Form 4 of May 7, 2026 0001222896-26-000004
• Advanced Energy Industries (AEIS) — Form 4 of May 2, 2026: option exercise or conversion of 2,313; 43,513 shares after 0001222896-26-000002
• Advanced Energy Industries (AEIS) — Form 4 of May 3, 2025: option exercise or conversion of 2,093; 41,200 shares after 0000950170-25-064774

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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