STOCK TITAN

Keros Therapeutics (KROS) finance executive discloses 46,368 shares and options

(Neutral)
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Annita Tanini, Corporate Controller and VP, Finance of Keros Therapeutics, Inc., reports her initial beneficial ownership of the company’s equity. She directly holds 46,368 shares of Common Stock, including 11,940 restricted stock units (RSUs) that vest in multiple tranches through 2027, subject to continued service.

She also holds several employee stock options on Common Stock, including options for 25,000 shares at $28.74 per share, 6,000 shares at $70.93, 7,500 shares at $46.30, 10,000 shares at $54.38, 14,800 shares at $56.18, and 7,800 shares at $15.52, with expirations ranging from 2030 to 2036. Certain options are immediately exercisable, while others vest over time in quarterly installments.

Positive

  • None.

Negative

  • None.
Insider Tanini Annita
Role Corp. Controller & VP, Finance
Type Security Shares Price Value
holding Employee Stock Option (Right to Buy) F2 -- -- --
holding Employee Stock Option (Right to Buy) F2 -- -- --
holding Employee Stock Option (Right to Buy) F2 -- -- --
holding Employee Stock Option (Right to Buy) F3 -- -- --
holding Employee Stock Option (Right to Buy) F4 -- -- --
holding Employee Stock Option (Right to Buy) F5 -- -- --
holding Common Stock F1 -- -- --
Holdings After Transaction: Employee Stock Option (Right to Buy) — 71,100 shares (Direct); Common Stock — 46,368 shares (Direct)
Footnotes (5)
  1. F1. Includes 11,940 restricted stock units ("RSUs"). Each RSU represents the contingent right to receive one share of common stock of the Issuer and shall vest (i) 4,080 RSUs on August 15, 2026, (ii) 3,960 RSUs on February 16, 2027, (iii) 975 RSUs on May 15, 2027, and (iv) 2,925 RSUs over a three-year period in twelve equal quarterly installments with the first such vesting to occur on August 15, 2027, subject to the Reporting Person's continuous service through each such vesting date.
  2. F2. Immediately exercisable.
  3. F3. One-fourth (1/4th) of the shares subject to the option vested on February 16, 2024, and one-twelfth (1/12th) of the remaining shares subject to the option vested or shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
  4. F4. One-fourth (1/4th) of the shares subject to the option vested on February 13, 2025, and one-twelfth (1/12th) of the remaining shares subject to the option vested or shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
  5. F5. One-fourth (1/4th) of the shares subject to the option shall vest on February 24, 2027, and one-twelfth (1/12th) of the remaining shares subject to the option shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
Direct Common Stock held 46,368 shares Directly held Common Stock reported by Annita Tanini
Restricted stock units 11,940 RSUs RSUs included within the direct Common Stock holdings
Option at $28.74 25,000 underlying shares Employee stock option, exercise price $28.74, expires 2030-05-28
Option at $70.93 6,000 underlying shares Employee stock option, exercise price $70.93, expires 2031-01-09
Option at $46.30 7,500 underlying shares Employee stock option, exercise price $46.30, expires 2032-01-20
Option at $54.38 10,000 underlying shares Employee stock option, exercise price $54.38, expires 2033-02-15
Option at $56.18 14,800 underlying shares Employee stock option, exercise price $56.18, expires 2034-02-12
Option at $15.52 7,800 underlying shares Employee stock option, exercise price $15.52, expires 2036-02-23
restricted stock units financial
"Includes 11,940 restricted stock units ("RSUs"). Each RSU represents the contingent right"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
contingent right financial
"Each RSU represents the contingent right to receive one share of common stock"
immediately exercisable financial
"Immediately exercisable."
quarterly installments financial
"shall vest in equal quarterly installments thereafter, subject to the Reporting Person"
Employee Stock Option (Right to Buy) financial
"security_title": "Employee Stock Option (Right to Buy)""

FAQ

What equity holdings does Keros Therapeutics (KROS) executive Annita Tanini report on this Form 3?

Annita Tanini reports 46,368 shares of Common Stock of Keros Therapeutics, including 11,940 RSUs. She also holds multiple employee stock options on Common Stock with various exercise prices and expirations between 2030 and 2036, all reported as direct ownership.

How many restricted stock units does the KROS officer hold and how do they vest?

She holds 11,940 RSUs. These vest as 4,080 RSUs on August 15, 2026, 3,960 on February 16, 2027, 975 on May 15, 2027, and 2,925 over three years in twelve equal quarterly installments starting August 15, 2027, contingent on continued service.

What stock options does Annita Tanini of Keros Therapeutics (KROS) hold and at what exercise prices?

She holds several employee stock options on Common Stock, including 25,000 shares at $28.74, 6,000 at $70.93, 7,500 at $46.30, 10,000 at $54.38, 14,800 at $56.18, and 7,800 at $15.52, each with specified expiration dates from 2030–2036.

Are any of the KROS officer’s stock options immediately exercisable?

Yes. Certain options held by Annita Tanini are described as immediately exercisable. Specifically, options linked to footnote F2, including tranches with exercise prices of $28.74, $70.93, and $46.30, are available for immediate exercise according to the disclosure.

How do some of the Keros Therapeutics (KROS) stock options vest over time for Annita Tanini?

Options tied to footnotes F3, F4, and F5 vest with one-fourth of shares vesting on specified February dates in 2024, 2025, and 2027, respectively. The remaining three-fourths vest in equal quarterly installments, subject to her continued service.

What is the total direct Common Stock position reported by the KROS executive on this Form 3?

She reports direct ownership of 46,368 shares of Common Stock. This figure includes 11,940 RSUs, each representing a contingent right to receive one share upon vesting, in addition to already-issued shares, all held directly rather than through an intermediary entity.

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

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SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Tanini Annita

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

(Street)
LEXINGTON MASSACHUSETTS 02421

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
08/04/2026
3. Issuer Name and Ticker or Trading Symbol
Keros Therapeutics, Inc. [ KROS ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Corp. Controller & VP, Finance
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock46,368(1)D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Employee Stock Option (Right to Buy) (2)05/28/2030Common Stock25,000$28.74D
Employee Stock Option (Right to Buy) (2)01/09/2031Common Stock6,000$70.93D
Employee Stock Option (Right to Buy) (2)01/20/2032Common Stock7,500$46.3D
Employee Stock Option (Right to Buy) (3)02/15/2033Common Stock10,000$54.38D
Employee Stock Option (Right to Buy) (4)02/12/2034Common Stock14,800$56.18D
Employee Stock Option (Right to Buy) (5)02/23/2036Common Stock7,800$15.52D
Explanation of Responses:
1. Includes 11,940 restricted stock units ("RSUs"). Each RSU represents the contingent right to receive one share of common stock of the Issuer and shall vest (i) 4,080 RSUs on August 15, 2026, (ii) 3,960 RSUs on February 16, 2027, (iii) 975 RSUs on May 15, 2027, and (iv) 2,925 RSUs over a three-year period in twelve equal quarterly installments with the first such vesting to occur on August 15, 2027, subject to the Reporting Person's continuous service through each such vesting date.
2. Immediately exercisable.
3. One-fourth (1/4th) of the shares subject to the option vested on February 16, 2024, and one-twelfth (1/12th) of the remaining shares subject to the option vested or shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
4. One-fourth (1/4th) of the shares subject to the option vested on February 13, 2025, and one-twelfth (1/12th) of the remaining shares subject to the option vested or shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
5. One-fourth (1/4th) of the shares subject to the option shall vest on February 24, 2027, and one-twelfth (1/12th) of the remaining shares subject to the option shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date.
/s/ Esther Cho, Attorney-in-Fact08/13/2026
** 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 5 (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 3: SEC 1473 (03-26)