Acumen Pharmaceuticals (NASDAQ: ABOS) insider sells 9,406 shares

Rhea-AI Filing Summary

Acumen Pharmaceuticals reported a Form 144 notice for the proposed sale of 9,406 shares of common stock on 02/27/2026. The filing identifies the sale method as a broker-assisted cashless exercise tied to employee stock options. The filing also lists multiple prior open-market dispositions by Derek Meisner during January 2026, with individual sales including 36,911 shares on 01/08/2026 and 15,085 shares on 01/26/2026.

Insights

Corporate Governance Specialist

Form 144 notifies the market of a proposed sale of 9,406 shares via cashless exercise.

The notice documents a broker-assisted cashless exercise on 02/27/2026 for 9,406 shares, indicating the transaction arises from option exercise rather than an open-market purchase. Prior January 2026 dispositions by the same reporting address are listed as separate sales.

Holder activity and the timing of settlement will determine actual market impact; subsequent filings will report the completed transactions.

Insider Transactions Analyst

Multiple insider sales occurred in January 2026 and a Rule 144 notice covers a separate February cashless exercise.

The excerpt lists many January sale entries by Derek Meisner (for example, 36,911 on 01/08/2026 and 15,085 on 01/26/2026). The February item is described as a proposed sale of 9,406 shares via exercise.

These items are disclosures of transactions; any material effect on ownership or float depends on final settlement numbers disclosed in subsequent reports.

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	9406	28310.82	60573425	02/27/2026	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	02/27/2026	Exercise of employee stock options	Acumen Pharmaceuticals, Inc.			9406	02/27/2026	Broker assisted cashless exercise

* 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
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/05/2026	4000	7838.00
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/06/2026	10898	21437.56
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/07/2026	11770	23414.63
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/08/2026	36911	67244.23
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/09/2026	5200	9169.00
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/12/2026	8548	14658.02
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/21/2026	2247	4063.33
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/22/2026	1054	1939.36
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/23/2026	5633	10492.83
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/26/2026	15085	45262.48
Derek Meisner 1210-1220 WASHINGTON STREET SUITE 210 NEWTON MA 02465	Common stock	01/28/2026	2671	8017.29

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 ABOS's Form 144 report?

It reports a proposed sale of 9,406 common shares on 02/27/2026. The filing states the shares arise from a broker-assisted cashless exercise of employee stock options and lists prior January 2026 dispositions by the reporting address.

Who is the reporting person on the ABOS Form 144?

The filing shows multiple dispositions linked to the address for Derek Meisner during January 2026. The February 9,406-share item is described separately as an exercise-related sale on 02/27/2026.

How many shares did ABOS insiders sell in January 2026 per the excerpt?

The excerpt lists multiple discrete sales during January 2026, including 36,911 on 01/08/2026 and 15,085 on 01/26/2026. These are individual transaction entries rather than a single aggregated total.

Does the Form 144 confirm the February sale was completed?

No, Form 144 is a notice of a proposed sale; it states a broker-assisted cashless exercise for 9,406 shares on 02/27/2026. Completion and settlement details would appear in later transaction reports.