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

September 22, 2025

Date of Report (Date of earliest event reported)

Adverum Biotechnologies, Inc.

(Exact name of registrant as specified in its charter)

Delaware

001-36579

20-5258327

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

100 Cardinal Way

Redwood City, CA 94063

(Address of principal executive offices, including zip code)

(650) 656-9323

(Registrant’s telephone number, including area code)

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 obligations of the registrant under any of the following provisions:

☐	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:

Title of each class

Trading
Symbol(s)

Name of each exchange

on which registered

Common Stock

ADVM

Nasdaq Capital Market

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. ☐

Item 7.01

Regulation FD Disclosure.

On September 22, 2025, Adverum Biotechnologies, Inc. (the “Company”) issued a press release. A copy of the press release is furnished as Exhibit 99.1 to this Current Report and incorporated herein by reference.

The information in this Item 7.01, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section. The information contained herein and in the accompanying exhibit is not incorporated by reference in any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in such filing.

Item 8.01

Other Events.

The Company announced that it plans to complete screening in the pivotal Phase 3 ARTEMIS trial evaluating Ixo-vec in wet age-related macular degeneration this month. The Company expects full enrollment of the ARTEMIS trial in the fourth quarter of 2025, with topline data from the ARTEMIS trial expected to be announced in the first quarter of 2027.

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including, without limitation, statements regarding the anticipated completion of screening, enrollment and announcement of the topline data results for the ARTEMIS Phase 3 trial. Such forward-looking statements are subject to risks and uncertainties that are often difficult to predict, are beyond the Company’s control, and which may cause results to differ materially from expectations. In addition, for a further discussion of factors that could materially affect the outcome of the Company’s forward-looking statements and its future results and financial condition, see “Risk Factors” in the Company’s periodic reports filed with the SEC. The Company does not undertake any obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.

Item 9.01

Financial Statements and Exhibits.


Exhibit No.		Description

99.1		Press Release dated September 22, 2025.

104		The cover page of this report has been formatted in Inline XBRL.

SIGNATURE

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

ADVERUM BIOTECHNOLOGIES, INC.

Date: September 22, 2025

/s/ Laurent Fischer

Laurent Fischer, M.D.

President and Chief Executive Officer

Adverum Biotechnologies, Inc. 8-K