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 4, 2021

Silverback Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (206) 456-2900

N/A

(Former name or former address, if changed since last report.)

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:

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 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.  ☐

Item 5.07 Submission of Matters to a Vote of Security Holders.

On June 4, 2021, Silverback Therapeutics, Inc. (the “Company”) held its 2021 Annual Meeting of Stockholders (the “Annual Meeting”). As of April 6, 2021, the record date for the Annual Meeting, 34,903,497 shares of common stock were outstanding and entitled to vote at the Annual Meeting. A summary of the matters voted upon by stockholders at the Annual Meeting is set forth below. Voting results are, when applicable, reported by rounding fractional share voting down to the nearest round number.

Proposal 1: Election of Directors

The Company’s stockholders elected the three persons listed below as Class I directors, each to serve until the Company’s 2024 Annual Meeting of Stockholders and until their respective successors are duly elected and qualified, or until their earlier death, resignation or removal. The final voting results are as follows:

Proposal 2: Ratification of the Selection of Independent Registered Public Accounting Firm

The Company’s stockholders ratified the selection by the Audit Committee of the Company’s Board of Directors of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2021. The final voting results are as follows:

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.

Dated: June 9, 2021