UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2025

Commission File Number: 001-41319

POET TECHNOLOGIES INC.

(Translation of registrant’s name into English)

120 Eglinton Avenue East, Ste. 1107

Toronto, Ontario M4P 1E2, Canada

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

DOCUMENTS INCLUDED AS PART OF THIS FORM 6-K

On April 28, 2025, POET Technologies Inc. (the “Company”) issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated by reference into the Registration Statement on Form F-10 (Registration No. 333-280553) of the Company.

EXHIBIT LIST

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, thereunto duly authorized.

Dated: April 28, 2025