UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 7, 2025

Applied Optoelectronics, Inc.

(Exact name of registrant as specified in its charter)

13139 Jess Pirtle Blvd.
Sugar Land, Texas 77478

(Address of principal executive offices and zip code)

(281) 295-1800

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

On June 7, 2025, Prime World International Holdings Ltd. (“Prime World”), a wholly owned subsidiary of Applied Optoelectronics, Inc., entered into a Land and Building Lease Agreement (the “Lease Agreement”) with San Ho Electric Machinery Industry Co., Ltd. (the “Lessor”), under which Prime World will lease a parcel of land with a total area of approximately 10,040.312 square meters, designated as Land No. 0066-0001, located in the Guanyu Section of Guanyin District, Taoyuan City. The lease also includes a building on the parcel, totaling approximately 12,225.902 square meters, situated at Building No. 819, Baiyu 3rd Road, Guanyin District, Taoyuan City (collectively, the “Leased Property”).

The lease term is for fifteen (15) years, commencing on September 1, 2025, and ending on August 31, 2040. A three-month renovation period from June 1 to August 31, 2025, will precede the lease term, during which no rent will be charged by the Lessor. During the lease term, the monthly rent will increase by three percent (3%) every three years. The monthly rent schedule, starting from September 1, 2025, through August 31, 2040, is as follows:

Under the terms of the Lease Agreement, Prime World has the right, at its own expense, to modify the building within the Leased Property as necessary to accommodate its production needs. Except as otherwise agreed by both parties, neither party may terminate the lease early.

Prime World holds additional rights under the Lease Agreement, including but not limited to: (i) the right of first refusal to purchase the Leased Property if the Lessor chooses to sell; (ii) the right to ensure that the Lease Agreement remains valid and binding on any purchaser in the event of a sale to a third party; and (iii) the right of first refusal to renew the lease under the same terms offered to other prospective tenants.

The foregoing description of the Lease Agreement does not purport to be a complete statement of the parties’ rights and obligations under the Lease Agreement and is qualified in its entirety by reference to the full text of the Lease Agreement, English translations of which are attached as Exhibit 10.1 to this Current Report on Form 8-K and incorporated by reference herein.

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.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.