Director to sell 13,040 shares via option exercise

ABOS files a Rule 144 notice for the sale of 13,040 shares.

Rhea-AI Filing Summary

ABOS files a Rule 144 notice for the sale of 13,040 shares. The filing lists the method as a Stock Option Exercise dated 06/17/2026 with cash proceeds. It also reports prior dispositions of 12,800 shares on 06/16/2026 for $29,767.68 and 6,460 shares on 06/15/2026 for $15,148.70.

Insights

Securities Compliance Analyst

Rules and timing: this is a routine Rule 144 sale filing tied to option exercise.

The notice records a Stock Option Exercise dated 06/17/2026 for 13,040 shares, indicating the seller intends to sell shares under Rule 144. Prior dispositions of 12,800 and 6,460 shares are listed with cash amounts.

Filing compliance hinges on holding periods and current resale conditions; cash‑flow treatment is stated as Cash and the transactions are reported on consecutive dates in June 2026. Subsequent filings will show completed sales or adjustments.

Key Figures

Shares to be sold: 13,040 shares Prior disposition: 12,800 shares Prior disposition: 6,460 shares

3 metrics

Shares to be sold 13,040 shares Stock Option Exercise on <date>06/17/2026</date>

Prior disposition 12,800 shares Sold on <date>06/16/2026</date> for <money>$29,767.68</money>

Prior disposition 6,460 shares Sold on <date>06/15/2026</date> for <money>$15,148.70</money>

Key Terms

Stock Option Exercise, Rule 144 notice, Cash

3 terms

Stock Option Exercise financial

"Common | 06/17/2026 | Stock Option Exercise | Issuer"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Rule 144 notice regulatory

"Form type: 144 (implied filing context)"

A Rule 144 notice is a public filing that an insider or holder of restricted stock submits when they plan to sell shares that aren’t freely tradable yet; it lists how many shares they intend to sell and under what conditions. For investors, it matters because it signals potential insider selling and an upcoming increase in shares available to the market—similar to someone announcing a big garage sale, which can affect supply and price expectations.

Cash financial

"06/17/2026 | Stock Option Exercise | Issuer | | | 13040 | 06/17/2026 | Cash"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does ABOS's Form 144 filing report?

It reports the intended sale of 13,040 shares via a stock option exercise on 06/17/2026. The filing also lists prior dispositions of 12,800 and 6,460 shares on 06/16/2026 and 06/15/2026 respectively, with stated cash amounts.

Who is the reported seller in the ABOS Form 144?

The filing shows transactions associated with Derrell Porter and an address in Newton, MA. The record lists prior sales tied to that name and the current option exercise dated 06/17/2026.

How much cash was reported from recent ABOS dispositions?

The filing shows proceeds of $29,767.68 for 12,800 shares on 06/16/2026 and $15,148.70 for 6,460 shares on 06/15/2026. The 06/17/2026 exercise is listed as Cash.

What method is ABOS using to effect the sale of shares?

The notice lists the method as a Stock Option Exercise for the 13,040 shares on 06/17/2026. The filing labels the transaction party as Issuer and the settlement type as Cash.

Does the Form 144 show completed sales or only intended sales?

The filing includes both: it records prior completed dispositions on 06/15/2026 and 06/16/2026 and an intended sale tied to a stock option exercise on 06/17/2026. Completion status for the exercise will appear in subsequent filings.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/17/2026 - 04:02 PM Learn about SEC filing dates

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	0001706400
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ACUMEN PHARMACEUTICALS, INC.
SEC File Number	001-40551
Address of Issuer	1210-1220 Washington Street, Suite 210 Newton, MASSACHUSETTS 02465
Phone	(617) 344-4190
Name of Person for Whose Account the Securities are To Be Sold	DERRELL PORTER
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	Director

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	13040	30323.22	72227580	06/17/2026	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	06/17/2026	Stock Option Exercise	Issuer			13040	06/17/2026	Cash

* 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
DERRELL PORTER 1210-1220 Washington Street, Suite 210 Newton, MA 02465	Common	06/16/2026	12800	29767.68
DERRELL PORTER 1210-1220 Washington Street, Suite 210 Newton, MA 02465	Common	06/15/2026	6460	15148.70

144: Remarks and Signature

Remarks
Date of Notice	06/17/2026
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	/s/ Derrell Porter
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)