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Atrium Therapeutics (RNA) awards RSUs and stock options to executive

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

Rhea-AI Filing Summary

Atrium Therapeutics, Inc. granted equity awards to executive Stephanie Kenney on April 20, 2026. She received 30,000 shares of common stock as restricted stock units, bringing her direct common stock holdings to 35,460 shares after the award.

Kenney was also granted stock options for 60,000 shares of common stock at an exercise price of $14.30 per share, expiring on April 20, 2036. Both the RSUs and options vest over multiple years starting March 20, 2027, subject to her continued service with the company.

Positive

  • None.

Negative

  • None.
Insider Kenney Stephanie
Role See Remarks
Type Security Shares Price Value
Grant/Award Stock Option (Right to Buy) 60,000 $0.00 --
Grant/Award Common Stock 30,000 $0.00 --
Holdings After Transaction: Stock Option (Right to Buy) — 60,000 shares (Direct, null); Common Stock — 35,460 shares (Direct, null)
Footnotes (1)
  1. Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock. Twenty-five percent (25%) of the RSUs shall vest on March 20, 2027, with the remaining RSUs vesting in three (3) substantially equal yearly installments each year thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date. Twenty-five percent (25%) of the shares underlying this option shall vest and become exercisable on March 20, 2027, with the remaining shares vesting in thirty-six (36) substantially equal monthly installments each month thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.
RSU grant 30,000 shares Restricted stock units awarded April 20, 2026
Common shares after award 35,460 shares Direct common stock holdings after RSU grant
Stock option grant 60,000 options Options on common stock awarded April 20, 2026
Option exercise price $14.30 per share Strike price for 60,000 stock options
Option expiration April 20, 2036 Expiration date of granted stock options
RSU initial vesting 25% on March 20, 2027 First vesting tranche of 30,000 RSUs
Option initial vesting 25% on March 20, 2027 First vesting tranche of 60,000 options
restricted stock units ("RSUs") financial
"Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right..."
Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.
Stock Option (Right to Buy) financial
"Stock Option (Right to Buy)... underlying security title Common Stock, underlying security shares 60000.0000"
vest financial
"Twenty-five percent (25%) of the RSUs shall vest on March 20, 2027..."
A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.
exercisable financial
"shares underlying this option shall vest and become exercisable on March 20, 2027..."
continuous service financial
"subject to the Reporting Person's continuous service to the Issuer on each such vesting date"
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*
Kenney Stephanie

(Last)(First)(Middle)
C/O ATRIUM THERAPEUTICS, INC.
10578 SCIENCE CENTER DRIVE, SUITE 125

(Street)
SAN DIEGO CALIFORNIA 92121

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Atrium Therapeutics, Inc. [ RNA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
See Remarks
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/20/2026
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 Stock04/20/2026A30,000(1)A$035,460D
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)$14.304/20/2026A60,000 (2)04/20/2036Common Stock60,000$060,000D
Explanation of Responses:
1. Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock. Twenty-five percent (25%) of the RSUs shall vest on March 20, 2027, with the remaining RSUs vesting in three (3) substantially equal yearly installments each year thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.
2. Twenty-five percent (25%) of the shares underlying this option shall vest and become exercisable on March 20, 2027, with the remaining shares vesting in thirty-six (36) substantially equal monthly installments each month thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.
Remarks:
Chief Corporate Affairs Officer
/s/ Brendan Winslow, Attorney-in-Fact04/22/2026
** 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 Atrium Therapeutics (RNA) report for Stephanie Kenney?

Atrium Therapeutics reported that executive Stephanie Kenney received equity awards, including 30,000 restricted stock units and 60,000 stock options. These compensation-related grants increase her equity stake without any open-market buying or selling activity disclosed in this filing.

How many Atrium Therapeutics (RNA) shares does Stephanie Kenney hold after this Form 4?

After the award, Stephanie Kenney directly holds 35,460 shares of Atrium Therapeutics common stock. This total reflects the addition of 30,000 restricted stock units granted on April 20, 2026, as disclosed in the Form 4 filing.

What equity awards did Atrium Therapeutics (RNA) grant to Stephanie Kenney?

Atrium Therapeutics granted Kenney 30,000 restricted stock units and stock options covering 60,000 shares of common stock at a $14.30 exercise price. These awards form part of her long-term equity compensation package with the company.

When do Stephanie Kenney’s Atrium Therapeutics (RNA) RSUs vest?

Twenty-five percent of Kenney’s 30,000 restricted stock units vest on March 20, 2027. The remaining RSUs vest in three substantially equal yearly installments thereafter, contingent on her continued service with Atrium Therapeutics on each vesting date.

What are the vesting terms of Stephanie Kenney’s Atrium Therapeutics (RNA) stock options?

For Kenney’s 60,000 stock options, 25% of the underlying shares vest and become exercisable on March 20, 2027. The remaining shares vest in 36 substantially equal monthly installments, assuming she continues to serve Atrium Therapeutics on each vesting date.

What is the exercise price and expiration date of Stephanie Kenney’s Atrium Therapeutics (RNA) options?

Kenney’s stock options have an exercise price of $14.30 per share and expire on April 20, 2036. She can only exercise vested portions of these options according to the multi-year vesting schedule tied to her continued service.