Thomas St Dennis
Thomas St Dennis: Director at FormFactor, Director at Veeco and Director at Axcelis Technologies. What Thomas St Dennis holds in 3 AI and semiconductor companies tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.
FormFactor (FORM)
Thomas St Dennis holds 28,333 FormFactor shares (0.04% of the company), worth about $4.3M at the last price, according to the Form 4 of Jun 16, 2026.
- Shares held: 28,333 (0.04%), $4.3M — Held in their own name.
Veeco (VECO)
Thomas St Dennis holds 61,697 Veeco shares (0.10% of the company), worth about $3.5M at the last price, according to the Form 4 of May 11, 2026.
- Shares held: 61,697 (0.10%), $3.5M — Held in their own name.
Axcelis Technologies (ACLS)
Thomas St Dennis holds 17,695 Axcelis Technologies shares (0.06% of the company), worth about $2.5M at the last price, according to the Form 4 of May 22, 2026.
- Shares held: 17,695 (0.06%), $2.5M — Held in their own name.
Declarations
- FormFactor (FORM) — Form 4 of Jun 16, 2026: open-market sale of 2,800 at $151.49; gift of 740; 28,333 shares after 0001628280-26-043696
- Axcelis Technologies (ACLS) — Form 4 of May 22, 2026: open-market sale of 900 at $155.37; 17,695 shares after 0001339595-26-000008
- FormFactor (FORM) — Form 4 of May 19, 2026: open-market sale of 1,000 at $115.84; 31,873 shares after 0001628280-26-037428
- FormFactor (FORM) — Form 4 of May 15, 2026: grant or award of 1,347; 32,873 shares after 0001628280-26-036647
- Axcelis Technologies (ACLS) — Form 4 of May 15, 2026: grant or award of 1,440; 18,595 shares after 0001339595-26-000006
- Veeco (VECO) — Form 4 of May 11, 2026: open-market sale of 1,400 at $61.93; 61,697 shares after 0001339595-26-000004
- Veeco (VECO) — Form 4 of May 8, 2026: grant or award of 2,945; 63,097 shares after 0001339595-26-000002
- FormFactor (FORM) — Form 4 of Feb 10, 2026: open-market sale of 5,601 at $93.71; open-market sale of 1,830 at $94.24; 31,526 shares after 0001628280-26-007388
- FormFactor (FORM) — Form 4 of Nov 17, 2025: open-market sale of 2,000 at $49.85; 38,957 shares after 0001628280-25-052756
- FormFactor (FORM) — Form 4 of May 29, 2025: open-market sale of 3,000 at $31.24; 40,957 shares after 0001039399-25-000065
- FormFactor (FORM) — Form 4 of May 16, 2025: grant or award of 6,528; 43,957 shares after 0001039399-25-000048
- Axcelis Technologies (ACLS) — Form 4 of May 15, 2025: grant or award of 3,586; 17,155 shares after 0001415889-25-013216
- Veeco (VECO) — Form 4 of May 9, 2025: grant or award of 8,291; 60,152 shares after 0001415889-25-012515
- FormFactor (FORM) — Form 4 of Nov 5, 2024: open-market sale of 3,100 at $39.11; 37,429 shares after 0001039399-24-000037
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.