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Acumen Pharmaceuticals (ABOS) director awarded RSUs and options for RA Capital

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Stoppel Laura reported acquisition or exercise transactions in this Form 4 filing.

Acumen Pharmaceuticals director Laura Stoppel reported equity awards tied to RA Capital-managed vehicles. She was granted 35,500 restricted stock units (RSUs), each representing one share of common stock, and 53,250 stock options with a strike price of $2.29 per share.

The RSUs and options vest in full on the earlier of the first anniversary of the June 3, 2026 grant date or the 2027 annual stockholder meeting, subject to her continuous service. Under her arrangement with RA Capital Management, L.P., any shares or cash from these awards benefit RA Capital Healthcare Fund, RA Capital Nexus Fund II and a separately managed account, and she disclaims beneficial ownership of the underlying stock.

Positive

  • None.

Negative

  • None.
Insider Stoppel Laura
Role null
Type Security Shares Price Value
Grant/Award Stock Option (right to buy) 53,250 $0.00 --
Grant/Award Common Stock 35,500 $0.00 --
Holdings After Transaction: Stock Option (right to buy) — 53,250 shares (Direct, null); Common Stock — 48,300 shares (Direct, null)
Footnotes (1)
  1. Represents a restricted stock unit ("RSU") award. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs will vest in full on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting, subject to the Reporting Person's continuous service through such vesting date. Under the Reporting Person's arrangement with RA Capital Management, L.P. (the "Adviser"), the Reporting Person holds the option and RSUs for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund II, L.P. (the "Nexus Fund II") and a separately managed account (the "Account"). The Reporting Person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the option or settlement of the RSUs, as applicable, which will offset advisory fees owed by the Fund, the Nexus Fund II and the Account to the Adviser. The Reporting Person therefore disclaims beneficial ownership of the option and RSUs and underlying common stock. The shares subject to the option will vest in full on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting, subject to the Reporting Person's continuous service through such vesting date.
RSU award 35,500 RSUs Each RSU equals one share of common stock
Stock options granted 53,250 options Right to buy Acumen common stock
Option exercise price $2.29 per share Conversion or exercise price for options
Option expiration June 3, 2036 Expiration date of granted options
Common stock after grant 48,300 shares Total common shares following RSU award
Underlying option shares 53,250 shares Common shares underlying the options
restricted stock unit ("RSU") financial
"Represents a restricted stock unit ("RSU") award. Each RSU represents a contingent right to receive one share"
continuous service financial
"will vest in full on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting, subject to the Reporting Person's continuous service"
conversion or exercise price financial
"conversion_or_exercise_price": "2.2900""
beneficial ownership financial
"The Reporting Person therefore disclaims beneficial ownership of the option and RSUs and underlying common stock."
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
separately managed account financial
"and a separately managed account (the "Account"). The Reporting Person is obligated to turn over to the Adviser any net cash or stock"
A separately managed account (SMA) is a personalized investment portfolio owned by a single investor and run by a professional manager who buys and sells securities on that investor’s behalf. It matters to investors because an SMA offers tailored asset selection, tax handling, and transparency—like hiring a personal chef who prepares meals to your dietary needs rather than sharing a set menu—so you can align holdings with your goals and see exactly what you own.
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Stoppel Laura

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Acumen Pharmaceuticals, Inc. [ ABOS ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/03/2026A35,500(1)A$048,300D(2)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy)$2.2906/03/2026A53,250 (3)06/03/2036Common Stock53,250$053,250D(2)
Explanation of Responses:
1. Represents a restricted stock unit ("RSU") award. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs will vest in full on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting, subject to the Reporting Person's continuous service through such vesting date.
2. Under the Reporting Person's arrangement with RA Capital Management, L.P. (the "Adviser"), the Reporting Person holds the option and RSUs for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund II, L.P. (the "Nexus Fund II") and a separately managed account (the "Account"). The Reporting Person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the option or settlement of the RSUs, as applicable, which will offset advisory fees owed by the Fund, the Nexus Fund II and the Account to the Adviser. The Reporting Person therefore disclaims beneficial ownership of the option and RSUs and underlying common stock.
3. The shares subject to the option will vest in full on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting, subject to the Reporting Person's continuous service through such vesting date.
Remarks:
/s/ Derek Meisner, Attorney-in-Fact06/05/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Acumen Pharmaceuticals (ABOS) report in this Form 4?

The filing reports equity awards associated with director Laura Stoppel. She received 35,500 RSUs and 53,250 stock options, both linked to Acumen Pharmaceuticals common stock, for the benefit of RA Capital-managed investment vehicles rather than as a traditional open-market purchase.

How many RSUs were granted in the Acumen (ABOS) Form 4 filing?

The Form 4 shows a grant of 35,500 restricted stock units. Each RSU represents a contingent right to receive one share of Acumen Pharmaceuticals common stock, vesting on the earlier of the first anniversary of grant or the company’s 2027 annual stockholder meeting.

What are the key terms of the stock options reported for Acumen (ABOS)?

The filing discloses 53,250 stock options with a conversion price of $2.29 per share. These options vest in full on the earlier of the first anniversary of the grant date or the 2027 annual stockholder meeting and expire on June 3, 2036, subject to continuous service.

Who ultimately benefits from the RSUs and options in this Acumen (ABOS) filing?

According to the footnotes, the RSUs and options are held for the benefit of RA Capital Healthcare Fund, RA Capital Nexus Fund II and a separately managed account. Any net stock or cash received offsets advisory fees, and Laura Stoppel disclaims beneficial ownership of the underlying shares.

Does the Acumen (ABOS) Form 4 indicate open-market buying or selling?

No open-market buying or selling is reported. The transactions are coded as awards, reflecting grants of RSUs and stock options rather than purchases or sales, and they are structured for the benefit of RA Capital-managed investment vehicles under an existing arrangement.

What is Laura Stoppel’s reported common stock position after these awards?

The Form 4 lists 48,300 shares of Acumen Pharmaceuticals common stock following the RSU grant. However, the footnotes state she must turn over any net stock or cash to RA Capital’s vehicles and therefore disclaims beneficial ownership of these securities.