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Keros Therapeutics (NASDAQ: KROS) director receives RSU and stock option awards

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

Rhea-AI Filing Summary

Keros Therapeutics director Mary Ann Gray received new equity awards. She was granted 7,142 shares of common stock in the form of restricted stock units that fully vest on the earlier of June 3, 2027 or the 2027 annual meeting, subject to continued service. She also received options for 7,433 shares at an exercise price of $10.50 per share, vesting in equal quarterly installments over 12 months after June 3, 2026 and fully vested by the 2027 annual meeting. Following the RSU grant, she directly holds 12,392 common shares.

Positive

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Insider GRAY MARY ANN
Role null
Type Security Shares Price Value
Grant/Award Stock Option (right to buy) 7,433 $0.00 --
Grant/Award Common Stock 7,142 $0.00 --
Holdings After Transaction: Stock Option (right to buy) — 7,433 shares (Direct, null); Common Stock — 12,392 shares (Direct, null)
Footnotes (1)
  1. Represents a restricted stock unit ("RSU") award. The RSUs fully vest on the earlier of (A) June 3, 2027 and (B) the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person continuing to provide service through each such date. The option shall vest in equal quarterly installments over the 12 months following June 3, 2026, provided that the grant will in any case be fully vested on the date of Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person continuing to provide service through each such date.
RSU grant 7,142 shares Restricted stock units granted on June 3, 2026
Post-grant common shares 12,392 shares Common stock directly held after RSU award
Stock options granted 7,433 options Stock options reported as acquired on June 3, 2026
Option exercise price $10.50 per share Conversion or exercise price of new stock options
Option expiration June 2, 2036 Expiration date of reported stock options
RSU full vesting date June 3, 2027 RSUs fully vest by this date or 2027 annual meeting
Option vesting schedule Quarterly over 12 months Equal quarterly vesting following June 3, 2026
restricted stock unit (RSU) financial
"Represents a restricted stock unit ("RSU") award. The RSUs fully vest on the earlier of (A) June 3, 2027..."
A restricted stock unit (RSU) is a promise from a company to give an employee company shares (or cash equal to their value) at a future date if certain conditions are met, such as staying with the company or hitting performance targets. For investors, RSUs matter because when they convert into actual shares they increase the number of shares available and can create selling pressure as employees cash out—think of them as a future paycheck paid in company stock.
Stock Option (right to buy) financial
"Stock Option (right to buy) ... conversion_or_exercise_price: "10.5000"..."
exercise price financial
"conversion_or_exercise_price: "10.5000""
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.
annual meeting of stockholders financial
"the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person continuing to provide service..."
vesting financial
"The option shall vest in equal quarterly installments over the 12 months following June 3, 2026..."
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
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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*
GRAY MARY ANN

(Last)(First)(Middle)
C/O KEROS THERAPEUTICS, INC.
1050 WALTHAM STREET, SUITE 302

(Street)
LEXINGTON MASSACHUSETTS 02421

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Keros Therapeutics, Inc. [ KROS ]
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 Stock06/03/2026A7,142(1)A$012,392D
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)$10.506/03/2026A7,433 (2)06/02/2036Common Stock7,433$07,433D
Explanation of Responses:
1. Represents a restricted stock unit ("RSU") award. The RSUs fully vest on the earlier of (A) June 3, 2027 and (B) the date of the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person continuing to provide service through each such date.
2. The option shall vest in equal quarterly installments over the 12 months following June 3, 2026, provided that the grant will in any case be fully vested on the date of Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person continuing to provide service through each such date.
/s/ Esther Cho, 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 Keros Therapeutics (KROS) director Mary Ann Gray report?

Mary Ann Gray reported receiving equity awards from Keros Therapeutics. She was granted 7,142 restricted stock units and stock options for 7,433 shares, both as compensation-related awards rather than open-market purchases or sales.

How many Keros Therapeutics (KROS) shares did Mary Ann Gray acquire through RSUs?

She received 7,142 shares of Keros Therapeutics common stock as a restricted stock unit grant. These RSUs are subject to a vesting schedule tied to June 3, 2027 or the company’s 2027 annual stockholder meeting, assuming continued service.

What are the key terms of Mary Ann Gray’s new stock options at Keros Therapeutics (KROS)?

She received stock options covering 7,433 Keros Therapeutics shares at a $10.50 exercise price. The options vest in equal quarterly installments over 12 months after June 3, 2026, and are fully vested by the 2027 annual meeting, subject to continued service.

When do Mary Ann Gray’s restricted stock units in Keros Therapeutics (KROS) fully vest?

The restricted stock units fully vest on the earlier of June 3, 2027 or the date of Keros Therapeutics’ 2027 annual meeting of stockholders. Vesting is conditioned on Mary Ann Gray continuing to provide service through the applicable date.

What is Mary Ann Gray’s Keros Therapeutics (KROS) shareholding after this Form 4?

After the reported RSU grant, Mary Ann Gray directly holds 12,392 shares of Keros Therapeutics common stock. This figure reflects her direct non-derivative holdings reported following the June 3, 2026 equity award transaction.

When do Mary Ann Gray’s Keros Therapeutics (KROS) stock options expire?

The stock options reported in the Form 4 expire on June 2, 2036. They vest in quarterly installments starting after June 3, 2026 and become fully vested by the 2027 annual meeting, assuming she continues to provide service.