Matthew Keith Custer

Companies

• CYANOTECH CORPBoard member Jun 22, 2022 to now¹
• CYANOTECH CORPChief executive officer Jun 22, 2022 to now¹
• CYANOTECH CORPPresident May 25, 2021 to now²
• CYANOTECH CORPVice President, Gen Mgr Nov 8, 2019 to Apr 8, 2021³

Holdings

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

Shares held

• CCYANOTECH CORP CYAN6,754 shares⁴$4.7K at $0.70Jul 29, 2025

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

Recent filings

• Jul 29, 2025Exercised options 2,075 shares of CYANOTECH CORP⁴
• Apr 7, 2025Exercised options 33 shares of CYANOTECH CORP⁵
• Jul 29, 2024Shares withheld for tax 779 shares at $0.56 of CYANOTECH CORP⁶
• Jul 29, 2024Exercised options 2,074 shares of CYANOTECH CORP⁶
• Apr 8, 2024Shares withheld for tax 13 shares at $0.40 of CYANOTECH CORP⁷
• Apr 8, 2024Exercised options 33 shares of CYANOTECH CORP⁷
• Jul 31, 2023Shares withheld for tax 978 shares at $0.84 of CYANOTECH CORP⁸
• Jul 31, 2023Exercised options 2,603 shares of CYANOTECH CORP⁸
• Apr 6, 2023Shares withheld for tax 13 shares at $0.94 of CYANOTECH CORP⁹
• Apr 6, 2023Exercised options 34 shares of CYANOTECH CORP⁹
• Aug 1, 2022Shares withheld for tax 199 shares at $3.15 of CYANOTECH CORP¹⁰
• Aug 1, 2022Exercised options 529 shares of CYANOTECH CORP¹⁰
• Apr 6, 2022Shares withheld for tax 13 shares at $3.03 of CYANOTECH CORP¹¹
• Apr 6, 2022Exercised options 33 shares of CYANOTECH CORP¹¹