Planned sale of 2,689 Acumen Pharmaceuticals (NASDAQ: ABOS) shares disclosed

Rhea-AI Filing Summary

Acumen Pharmaceuticals, Inc. shareholder Daniel OConnell filed a notice of proposed sale of common stock under Rule 144. The filing covers the planned sale of 2,689 shares of common stock through Merrill Lynch, with an aggregate market value of $5,065.60 and 60,573,425 shares outstanding. The planned sale is expected around 01/22/2026 on the NASDAQ exchange.

The 2,689 shares to be sold 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, with the same date listed for payment. The notice also lists prior sales of Acumen Pharmaceuticals common stock by Daniel OConnell over the past three months, including multiple transactions between 01/05/2026 and 01/21/2026 with disclosed share amounts and gross proceeds for each sale.

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

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	2689	5065.60	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.			2689	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
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/05/2026	4649	9163.33
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/06/2026	5102	10031.44
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/07/2026	37755	74980.95
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/08/2026	8143	14815.32
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/09/2026	12941	22832.18
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/12/2026	5388	9306.56
Daniel OConnell 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/21/2026	9346	16927.34

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 discloses that Daniel OConnell intends to sell 2,689 shares of Acumen Pharmaceuticals, Inc. common stock on the NASDAQ, with an aggregate market value of $5,065.60 and 60,573,425 shares outstanding.

How many Acumen Pharmaceuticals (ABOS) shares are proposed to be sold under this Form 144?

The notice states that 2,689 shares of common stock are to be sold, with an aggregate market value of $5,065.60 as disclosed in the securities information table.

When were the ABOS shares to be sold under this Form 144 acquired and how?

The 2,689 shares were acquired on 01/17/2026 via vesting of a restricted stock unit award from Acumen Pharmaceuticals, Inc., granted as part of the issuer’s equity compensation plan.

Which broker and exchange are listed for the planned ABOS share sale?

The filing lists Merrill Lynch, located at 225 Liberty St Floor 37, New York, NY 10281, as broker, and the NASDAQ as the securities exchange for the planned sale.

What prior sales of Acumen Pharmaceuticals (ABOS) shares are disclosed for the past 3 months?

The notice shows that Daniel OConnell previously sold Acumen common stock on several dates, including 01/05/2026, 01/06/2026, 01/07/2026, 01/08/2026, 01/09/2026, 01/12/2026, and 01/21/2026, with each transaction’s share amount and gross proceeds listed.

What does the Rule 144 representation in this ABOS filing say about non-public information?

The signer represents that the person for whose account the securities are to be sold does not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, as stated in the notice’s attention section.

Is the ABOS Form 144 sale related to an equity compensation plan?

Yes. The 2,689 shares to be sold were acquired through the vesting of a restricted stock unit award that was granted as part of the issuer equity compensation plan of Acumen Pharmaceuticals, Inc.