UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K/A

 (Amendment No. 1)

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): April 11, 2021

SILICON LABORATORIES INC.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (512) 416-8500

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):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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 or Rule 12b-2 of the Securities Exchange Act of 1934.

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 Securities Exchange Act of 1934. ¨

Explanatory Note

On April 13, 2021, Silicon Laboratories Inc. (“Silicon Laboratories”) filed a Current Report on Form 8-K (the “Original Report”) to report the appointment of Mark D. Mauldin as chief accounting officer. As of the date of the Original Report, the terms of any equity award to be granted to Mr. Mauldin in connection with such appointment had not been determined. This Amendment No. 1 to the Original Report is being filed solely for the purpose of providing the terms of such equity award.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

In connection with Mr. Mauldin’s appointment as the chief accounting officer, on May 15, 2021 the Compensation Committee of the Board of Directors of Silicon Laboratories approved a grant of 1,932 restricted stock units (which shall vest in three equal annual installments contingent upon Mr. Mauldin’s continued service through each such date). On May 15, 2021, the Compensation Committee also approved, and the Company entered into, the Executive Severance Agreement with Mr. Mauldin that was included in the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 17, 2021.

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 hereunto duly authorized.