Form 4 Filing for Chang Hung-Lun (Fred)

Chang Hung-Lun (Fred), Senior Vice President and North America General Manager at APPLIED OPTOELECTRONICS, INC. (AAOI), reported the sale of 40,329 shares of common stock on June 17, 2026. The sales were executed under a Rule 10b5-1 trading plan adopted on March 18, 2026. The shares were sold at prices ranging from $168.00 to $173.78, with a weighted average sale price of $170.60 per share. Following these transactions, Chang Hung-Lun (Fred) owns 286,124 shares. The reporting person has undertaken to provide full information regarding each transaction upon request by SEC staff, the issuer, or a security holder.