Acumen Pharmaceuticals (NASDAQ: ABOS) insider files to sell 462 shares

Rhea-AI Filing Summary

Acumen Pharmaceuticals insider Russell Barton has filed a notice of proposed sale under Rule 144 covering 462 shares of common stock. The shares are to be sold through Merrill Lynch on 01/22/2026 on the NASDAQ market, with an aggregate market value of $850.08. Shares outstanding were 60,573,425, which is a baseline figure for the company’s equity.

The 462 shares were acquired on 01/17/2026 through the vesting of a restricted stock unit award granted as part of the issuer’s equity compensation plan. The filing also lists several prior sales of Acumen common stock by Barton over the past three months, including 4,000 shares sold on 01/05/2026 for gross proceeds of 7,832.50. The signer represents that they are not aware of undisclosed material adverse information about the company.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common stock	Merrill Lynch 225 Liberty St Floor 37 New York NY 10281	462	850.08	60573425	01/22/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common stock	01/17/2026	Vesting of restricted stock unit award	Acumen Pharmaceuticals, Inc.			462	01/17/2026	Granted as part of issuer equity compensation plan

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Russell Barton 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/05/2026	4000	7832.50
Russell Barton 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/06/2026	3618	7114.46
Russell Barton 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/07/2026	1700	3378.00
Russell Barton 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/08/2026	3530	6561.55
Russell Barton 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/21/2026	2315	4180.88

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filing for ABOS disclose?

The Form 144 filing discloses that Russell Barton intends to sell 462 shares of Acumen Pharmaceuticals, Inc. common stock through Merrill Lynch on 01/22/2026 on the NASDAQ exchange.

How many Acumen Pharmaceuticals (ABOS) shares are covered by this planned sale?

The notice covers a proposed sale of 462 shares of Acumen Pharmaceuticals common stock, with an indicated aggregate market value of 850.08.

How were the ABOS shares in this Form 144 acquired?

The 462 shares were acquired on 01/17/2026 through the vesting of a restricted stock unit award granted as part of Acumen Pharmaceuticals’ equity compensation plan.

What is the total number of Acumen Pharmaceuticals shares outstanding?

The filing states that the number of Acumen Pharmaceuticals common shares outstanding is 60,573,425, providing a baseline for the company’s equity capital.

What prior sales of ABOS stock by this insider are reported in the last 3 months?

The filing lists several prior sales of Acumen common stock by Russell Barton in the past three months, including 4,000 shares sold on 01/05/2026 for gross proceeds of 7,832.50, along with additional sales on 01/06/2026, 01/07/2026, 01/08/2026, and 01/21/2026.

Which broker is handling the planned ABOS share sale?

The proposed sale of 462 shares of Acumen Pharmaceuticals common stock is to be executed through Merrill Lynch, located at 225 Liberty St, Floor 37, New York, NY 10281.

Does the insider make any representation about undisclosed information on ABOS?

By signing the notice, the seller represents that they do not know any material adverse information about Acumen Pharmaceuticals’ current or prospective operations that has not been publicly disclosed.