Dennis Thomas St

Companies

• VeecoBoard member May 6, 2016 to now¹
• Axcelis TechnologiesBoard member May 13, 2015 to now²
• FORMFACTOR INCBoard member Sep 14, 2010 to now³
• Mattson TechnologyBoard member Sep 17, 2013 to May 11, 2016⁴
• FORMFACTOR INCChair May 6, 2015 to Jun 1, 2015⁵
• FORMFACTOR INCChief executive officer Sep 14, 2010 to Mar 9, 2015³
• Applied MaterialsSenior Vice President Sep 23, 2005 to Sep 2, 2009⁶

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Applied Materials AMAT275,373 shares⁷$112.7M at $409.39Sep 2, 2009
• FFORMFACTOR INC FORM28,333 shares⁸$3.2M at $111.23Jun 16, 2026
• Veeco VECO61,697 shares⁹$2.7M at $43.84May 11, 2026
• Axcelis Technologies ACLS17,695 shares¹⁰$2.0M at $111.93May 22, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Jun 16, 2026Gift 740 shares of FORMFACTOR INC⁸
• Jun 15, 2026Sold 2,800 shares at $151.49 of FORMFACTOR INC⁸
• May 22, 2026Sold 900 shares at $155.37 of Axcelis Technologies¹⁰
• May 19, 2026Sold 1,000 shares at $115.84 of FORMFACTOR INC¹¹
• May 15, 2026Granted 1,347 shares of FORMFACTOR INC¹²
• May 15, 2026Granted 1,440 shares of Axcelis Technologies¹³
• May 11, 2026Sold 1,400 shares at $61.93 of Veeco⁹
• May 8, 2026Granted 2,945 shares of Veeco¹⁴
• Feb 10, 2026Sold 1,830 shares at $94.24 of FORMFACTOR INC¹⁵
• Feb 10, 2026Sold 5,601 shares at $93.71 of FORMFACTOR INC¹⁵
• Nov 17, 2025Sold 2,000 shares at $49.85 of FORMFACTOR INC¹⁶
• May 29, 2025Sold 3,000 shares at $31.24 of FORMFACTOR INC¹⁷
• May 16, 2025Granted 6,528 shares of FORMFACTOR INC¹⁸
• May 15, 2025Granted 3,586 shares of Axcelis Technologies¹⁹
• May 9, 2025Granted 8,291 shares of Veeco²⁰
• Nov 5, 2024Sold 3,100 shares at $39.11 of FORMFACTOR INC²¹
• May 17, 2024Granted 3,828 shares of FORMFACTOR INC²²
• May 15, 2024Granted 1,662 shares of Axcelis Technologies²³
• May 15, 2024Granted 1,162 shares of Axcelis Technologies²⁴
• May 13, 2024Sold 4,000 shares at $37.72 of Veeco²⁵
• May 10, 2024Granted 3,677 shares of Veeco²⁶
• May 10, 2024Sold 2,000 shares at $56.30 of FORMFACTOR INC²⁷
• Nov 30, 2023Sold 7,005 shares at $28.52 of Veeco²⁸
• Nov 14, 2023Sold 3,792 shares at $38.24 of FORMFACTOR INC²⁹
• May 19, 2023Granted 6,770 shares of FORMFACTOR INC³⁰

Trade performance

Returns are price-only (no dividends), measured from the trade date.