X0508 4 2025-05-19 0000768408 CYANOTECH CORP CYAN 0001789253 Nordin Amy Beth CYANOTECH CORPORATION 73-4460 QUEEN KAAHUMANU HWY #102 KAILUA-KONA HI 96740 1 VP, HR, Secretary 0 Cyanotech common stock options 0.32 2025-05-19 4 A 0 75000 0 A 2035-05-19 Cyanotech common stock 75000 75000 D The stock options vest as to 25,000 shares on May 19, 2026, 25,000 shares on May 19, 2027 and 25,000 shares on May 19, 2028, in each case subject to the reporting person's continued service with the Company on the vesting date. /s/Laura L. Taylor, by Power of Attorney 2025-05-21