Item 1.01 Entry into a Material Definitive Agreement. On April 7, 2026, Applied Optoelectronics, Inc. (the “ Company”) entered into a Purchase and Sale Agreement (the “ Purchase Agreement”) with SRPF D/Kirby Industrial, L. P. (the “ Seller”), pursuant to which the Company agreed to acquire from the Seller certain real property and improvements located at 14621 Kirby Drive, Pearland, Texas 77047 and 11555 North Spectrum Boulevard, Pearland, Texas 77047, consisting of approximately 388,133 square feet in the aggregate, together with certain related personal property, intangible personal property, and assignable contract rights relating thereto (collectively, the “ Property”). The Company intends to use the Property for office, warehouse, manufacturing, and assembly purposes. The aggregate purchase price for the Property is $58,428,612.00. The Purchase Agreement requires the Company to deposit $1,168,512.00 with the title company within three business days following execution of the Purchase Agreement. Closing is currently scheduled to occur on April 17, 2026, subject to the Company’s right to accelerate the closing upon prior written notice to the Seller. The Property includes the applicable land, buildings, improvements, fixtures, and certain other tangible personal property owned by the Seller and located on the Property, as well as certain assignable intangible personal property and contract rights relating to the Property. The Purchase Agreement contains customary representations, warranties, covenants, closing conditions, risk allocation provisions, and termination rights for a transaction of this nature. Among other things, the Company has the right to terminate the Purchase Agreement under certain circumstances, including in connection with specified title matters, certain casualty or condemnation events, and certain failures of closing conditions. The foregoing description of the Purchase Agreement does not purport to be a complete statement of the parties’ rights and obligations under the Purchase Agreement and is qualified in its entirety by reference to the full text of the Purchase Agreement, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and incorporated by reference herein.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation The information contained in Item 1.01 of this Current Report on Form 8-K with respect to the Lease Agreement is incorporated by reference into Item 2.03.

Item 9.01 Financial Statements and Exhibits. (d) Exhibits 10.1 Purchase and Sale Agreement, dated April 7, 2026, by and between Applied Optoelectronics, Inc. and SRPF D/Kirby Industrial L. P. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 104 Cover Page Interactive File (the cover page tags are embedded within the Inline XBRL document). 2 SIGNATURES