Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): March 9, 2023
Acumen Pharmaceuticals, Inc.
(Exact name of Registrant as Specified in Its Charter)
(State or Other Jurisdiction
of Incorporation)
File Number)
(IRS Employer
Identification No.)
427 Park St.,
Charlottesville, Virginia
(Address of Principal Executive Offices)(Zip Code)
(Registrant’s Telephone Number, Including Area Code)
Not Applicable
(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 (see General Instructions A.2. below):
oWritten communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
oSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
oPre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
oPre-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
Name of each exchange
on which registered
Common Stock, $0.0001 par valueABOSThe Nasdaq Global Select 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  x
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.  o

Item 5.03    Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On March 9, 2023, in connection with the adoption of Rule 14a-19 (the “Universal Proxy Rules”) under the Securities Exchange Act of 1934, as amended, certain recent changes to the Delaware General Corporation Law (the “DGCL”), and a periodic review of the bylaws of Acumen Pharmaceuticals, Inc. (the “Company”), the Board of Directors of the Company (the “Board”) adopted amended and restated bylaws (the “Amended and Restated Bylaws”), effective immediately. Among other things, the Amended and Restated Bylaws:
enhance the procedural mechanics and disclosure requirements in connection with stockholder nominations of directors and other proposals made in connection with annual and special meetings of shareholders by, among other things:
requiring additional background information and disclosures regarding proposing stockholders and proposed nominees;
requiring any stockholder submitting a nomination notice to make a representation as to whether such shareholder intends to solicit proxies in support of director nominees other than the Company’s nominees in accordance with Rule 14a-19 under the Exchange Act and to provide reasonable evidence that certain requirements of such rule have been satisfied;
clarifying that the Company will disregard the nomination of each proposed director nominee other than the Company’s nominees (notwithstanding that the nominee is included as a nominee in the Company’s proxy statement, notice of meeting or other proxy materials for any annual meeting (or any supplement thereto) and notwithstanding that proxies or votes in respect of the election of such proposed nominees may have been received by the Company (which proxies and votes shall be disregarded)) if, after a stockholder provides notice pursuant to Rule 14a-19 under the Exchange Act, such stockholder subsequently fails to comply with the requirements of Rule 14a-19 under the Exchange Act;
prohibiting stockholders from nominating placeholder nominees; and
any stockholder directly or indirectly soliciting proxies from other stockholders to use a proxy card other than white, with the white proxy card being reserved for exclusive use by the Board.
modify the provisions relating to stockholder meeting adjournment procedures and the list of stockholders entitled to vote at stockholder meetings to reflect recent amendments to the DGCL.
make other updates, including ministerial, clarifying and conforming changes.
The foregoing summary and description of the Amended and Restated Bylaws does not purport to be complete and is qualified in its entirety by reference to, and should be read in conjunction with, the full text of the Amended and Restated Bylaws, a copy of which is filed as Exhibit 3.1 hereto and is incorporated herein by reference.
Item 9.01    Financial Statements and Exhibits.
104Cover Page Interactive Data File (embedded within the Inline XBRL document).

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Company has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Acumen Pharmaceuticals, Inc.
Dated: March 15, 2023By:/s/ Derek M. Meisner
Derek M. Meisner
Chief Legal Officer