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 September 2026

Commission File Number: 000-51380

Silicon Motion Technology Corporation

(Exact name of Registrant as specified in its charter)

Flat C, 19/F, Wing Cheong Commercial Building

Nos 19-25 Jervois Street

Hong Kong

(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 ☐

This Form 6-K is hereby incorporated by reference into the Company’s Registration Statement on Form S-8 filed with the U.S. Securities and Exchange Commission on June 4, 2025 (Registration No. 333-287771).

2

SIGNATURE

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.

3

Exhibit 99.1

SILICON MOTION TECHNOLOGY CORPORATION

THE 2026 ANNUAL GENERAL MEETING OF SHAREHOLDERS VOTING RESULTS

Silicon Motion Technology Corporation, a company organized under the laws of the Cayman Islands (the “Company”), held its 2026 Annual General Meeting of Shareholders on September 22, 2026 (the “Annual Meeting”).

135,372,262 ordinary shares out of the Company’s 135,632,940 ordinary shares issued and outstanding, which represented more than a majority of the Company issued and outstanding ordinary shares were represented in person or by proxy at the Annual Meeting, constituting a quorum.

At the Annual Meeting, the Company’s shareholders considered two proposals, each of which is described briefly below and in more detail in the Company’s Notice of Annual General Meeting, dated August 10, 2026¹. The final voting results for each proposal are set forth below.

PROPOSAL 1: To re-elect Mr. Tsung-Ming Chung and Mr. Steve Chen as the directors of the Company, who retired by rotation pursuant to the Articles.

The foregoing proposal had been passed as an ordinary resolution at the Annual Meeting.

PROPOSAL 2: To ratify the appointment of Deloitte & Touche as independent auditors of the Company for the fiscal year ending on December 31, 2026 and authorize the directors to fix their remuneration.

The foregoing proposal had been passed as an ordinary resolution at the Annual Meeting.