X0508 4 2025-09-12 0000768408 CYANOTECH CORP CYAN 0002084332 Miyashiro Jennifer A.S. 73-4460 QUEEN KAAHUMANU HWY #102 KAILUA-KONA HI 96740 1 CFO, VP Fin & Admin, Treasurer 0 Cyanotech Common Stock Options 0.29 2025-09-12 4 A 0 50000 0 A 2035-09-12 Cyanotech Common Stock 50000 50000 D The stock options applicable vesting date as to 16,666 shares on September 12, 2026, 16,667 shares on September 12, 2027 and 16,667 shares on September 12, 2028 in each case subject to the continued service with Cyanotech on the vesting date. /s/ Linda Tanoai, by Power of Attorney 2025-09-15