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Acumen Pharmaceuticals (NASDAQ: ABOS) director receives RSU and option grants

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

Rhea-AI Filing Summary

Acumen Pharmaceuticals director Nathan B. Fountain received new equity awards as part of his compensation. He was granted 35,500 shares of common stock in the form of restricted stock units, bringing his direct common stock holdings to 54,550 shares after the award. He also received stock options for 53,250 shares with an exercise price of $2.29 per share. Both the RSUs and options vest in full on the earlier of the first anniversary of the grant date or the 2027 annual stockholder meeting, provided he continues serving the company through that date.

Positive

  • None.

Negative

  • None.
Insider Fountain Nathan B
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 — 54,550 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. 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 shares Restricted stock units granted to director
Common stock held 54,550 shares Direct holdings after RSU grant
Stock options granted 53,250 options Right to buy common stock
Option exercise price $2.29 per share Strike price for newly granted options
Option expiration June 3, 2036 Expiration date of granted 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
"subject to the Reporting Person's continuous service through such vesting date"
Stock Option (right to buy) financial
"Stock Option (right to buy)"
annual stockholder meeting financial
"on the earlier of the first anniversary of the date of grant or the 2027 annual stockholder meeting"
An annual stockholder meeting is a yearly gathering where a company's owners (shareholders) receive updates on performance, vote on key issues like board members, executive pay and major corporate plans, and ask questions of management. Think of it as a company town hall where choices about oversight and direction are decided; outcomes can affect management accountability, corporate strategy and ultimately the value and risks of investors’ shares.
exercise price financial
"conversion_or_exercise_price": "2.2900""
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
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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*
Fountain Nathan B

(Last)(First)(Middle)
C/O ACUMEN PHARMACEUTICALS, INC.
1210-1220 WASHINGTON STREET, SUITE 210

(Street)
NEWTON MASSACHUSETTS 02465

(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$054,550D
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 (2)06/03/2036Common Stock53,250$053,250D
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. 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 insider transaction did Acumen Pharmaceuticals (ABOS) disclose for Nathan B. Fountain?

Acumen Pharmaceuticals disclosed that director Nathan B. Fountain received equity awards, including restricted stock units and stock options. These awards are compensation-related grants rather than open-market purchases or sales of Acumen Pharmaceuticals common stock.

How many Acumen Pharmaceuticals (ABOS) shares did Nathan B. Fountain receive?

Nathan B. Fountain received 35,500 restricted stock units, each representing one share of Acumen Pharmaceuticals common stock. Following this grant, his direct common stock holdings totaled 54,550 shares, reflecting the newly awarded RSUs in his reported position.

What stock options were granted to Nathan B. Fountain at Acumen Pharmaceuticals (ABOS)?

Nathan B. Fountain was granted options covering 53,250 shares of Acumen Pharmaceuticals common stock with an exercise price of $2.29 per share. These options give him the right to buy shares at that fixed price if and when they vest.

When do Nathan B. Fountain’s RSUs and options at Acumen Pharmaceuticals (ABOS) vest?

Both the restricted stock units and the stock options vest in full on the earlier of the first anniversary of the grant date or the 2027 annual stockholder meeting. Vesting requires his continuous service with Acumen Pharmaceuticals through that vesting date.

Are Nathan B. Fountain’s Acumen Pharmaceuticals (ABOS) awards tied to continued service?

Yes. The RSU and stock option awards vest only if Nathan B. Fountain maintains continuous service with Acumen Pharmaceuticals through vesting. If he does not remain in service until the vesting date, the awards may not fully vest as described.

Do Nathan B. Fountain’s Acumen Pharmaceuticals (ABOS) transactions involve open-market buying or selling?

No. The filing shows compensation-related grants of restricted stock units and stock options, coded as awards. There are no open-market purchases or sales; the shares and options were granted at no cash cost per share in the reported transactions.