Scholar Rock (SRRK) CSO trades under 10b5-1 plan on January 14 2026

Rhea-AI Filing Summary

Scholar Rock Holding Corp’s chief scientific officer, Mo Qatanani, reported option exercises and a share sale in company stock. On January 14, 2026, Qatanani exercised several stock options covering a total of 13,112 shares of common stock at exercise prices of $7.62, $10, $15.75, $18.08, and $35.15 per share.

On the same day, Qatanani sold 13,112 shares of common stock at a weighted average price of $45.1961 per share under a Rule 10b5-1 trading plan adopted on March 31, 2025. After these transactions, Qatanani directly holds 108,964 restricted stock units (RSUs) and still has multiple stock options outstanding with unvested portions of 961, 11,250, 47,143, and 32,142 shares, subject to continued service-based vesting.

Insights

Equity compensation analyst

Routine planned option exercises and sale by Scholar Rock’s CSO under a Rule 10b5-1 plan.

The filing shows that Mo Qatanani, chief scientific officer of Scholar Rock Holding Corp, exercised multiple employee stock options on January 14, 2026, converting a total of 13,112 options into common shares at exercise prices between $7.62 and $35.15. These are standard option exercises, with one grant fully exhausted and others retaining significant unvested balances.

On the same date, Qatanani sold 13,112 shares of common stock at a weighted average price of $45.1961 per share, with sales executed across a range of $45.00 to $45.45. The filing specifies that this activity occurred pursuant to a Rule 10b5-1 trading plan adopted on March 31, 2025, indicating the trades were pre-arranged. After the transactions, Qatanani directly holds 108,964 RSUs plus unvested option positions of 961, 11,250, 47,143, and 32,142 shares, which vest quarterly contingent on continued service.

SEC Form 4

FORM 4

UNITED 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).

X

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^*

Qatanani Mo

(Last) (First) (Middle)

301 BINNEY STREET

(Street)

CAMBRIDGE MA 02142

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Scholar Rock Holding Corp [ SRRK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF SCIENTIFIC OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
01/14/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/14/2026		M		1,407(1)	A	$18.08	110,371(2)	D
Common Stock	01/14/2026		M		321(1)	A	$7.62	110,692(3)	D
Common Stock	01/14/2026		M		2,813(1)	A	$10	113,505(4)	D
Common Stock	01/14/2026		M		5,893(1)	A	$15.75	119,398(5)	D
Common Stock	01/14/2026		M		2,678(1)	A	$35.15	122,076(6)	D
Common Stock	01/14/2026		S		13,112(1)	D	$45.1961(7)	108,964(8)	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$18.08	01/14/2026		M(1)			1,407	(9)	02/14/2032	Common Stock	1,407	$0	0	D
Stock Option (Right to Buy)	$7.62	01/14/2026		M(1)			321	(10)	10/10/2032	Common Stock	321	$0	961	D
Stock Option (Right to Buy)	$10	01/14/2026		M(1)			2,813	(11)	02/13/2033	Common Stock	2,813	$0	11,250	D
Stock Option (Right to Buy)	$15.75	01/14/2026		M(1)			5,893	(12)	02/12/2034	Common Stock	5,893	$0	47,143	D
Stock Option (Right to Buy)	$35.15	01/14/2026		M(1)			2,678	(13)	03/10/2035	Common Stock	2,678	$0	32,142	D

Explanation of Responses:

1. This transaction was effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted on March 31, 2025.

2. Consists of 1,407 shares of common stock and 108,964 RSUs.

3. Consists of 1,728 shares of common stock and 108,964 RSUs.

4. Consists of 4,541 shares of common stock and 108,964 RSUs.

5. Consists of 10,434 shares of common stock and 108,964 RSUs.

6. Consists of 13,112 shares of common stock and 108,964 RSUs.

7. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.00 to $45.45, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

8. Consists of 108,964 RSUs.

9. No shares remain unvested under this stock option.

10. 961 shares remain unvested under this stock option. The first vesting event occurred on January 5, 2023 and the remainder vests in fifteen quarterly installments thereafter; provided the reporting person continues to have a service relationship with the Issuer on such vesting date.

11. 11,250 shares remain unvested under this stock option. The first vesting event occurred on April 1, 2023 and the remainder vests in fifteen quarterly installments thereafter; provided the reporting person continues to have a service relationship with the Issuer on such vesting date.

12. 47,143 shares remain unvested under this stock option. The first vesting event occurred on April 1, 2024 and the remainder vests in fifteen quarterly installments thereafter; provided the reporting person continues to have a service relationship with the Issuer on such vesting date.

13. 32,142 shares remain unvested under this stock option. The first vesting event occurred on April 1, 2025 and the remainder vests in fifteen quarterly installments thereafter; provided the reporting person continues to have a service relationship with the Issuer on such vesting date.

	/s/ Junlin Ho, Attorney-in-Fact for Mo Qatanani	01/16/2026
	** Signature of Reporting Person	Date
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.
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FAQ

Who is the insider in Scholar Rock (SRRK)’s Form 4 filing and what is their role?

The insider is Mo Qatanani, who serves as Chief Scientific Officer of Scholar Rock Holding Corp and is filing as an officer of the company.

What transactions did Scholar Rock (SRRK) CSO Mo Qatanani report on January 14, 2026?

On January 14, 2026, Qatanani exercised stock options covering 13,112 shares of common stock and then sold 13,112 shares of common stock in the open market.

At what prices did the Scholar Rock (SRRK) CSO exercise stock options and sell shares?

Options were exercised at strike prices of $7.62, $10, $15.75, $18.08, and $35.15 per share. The 13,112 shares sold had a weighted average sale price of $45.1961 per share, with sales between $45.00 and $45.45.

Was the Scholar Rock (SRRK) insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states that the transaction was effected by the reporting person pursuant to a Rule 10b5-1 trading plan adopted on March 31, 2025, indicating the trades were pre-scheduled.

How many Scholar Rock (SRRK) shares and RSUs does the CSO hold after these transactions?

Following the reported transactions, Qatanani directly holds 108,964 restricted stock units (RSUs). Share totals given in the table reflect combinations of common stock and these RSUs, with one line item showing 108,964 RSUs alone.

What stock options remain outstanding for the Scholar Rock (SRRK) CSO after the Form 4 transactions?

After the exercises, one option grant has no shares remaining unvested. Other grants still have unvested portions of 961, 11,250, 47,143, and 32,142 shares, each vesting in quarterly installments contingent on Qatanani maintaining a service relationship with Scholar Rock.

What does the weighted average sale price disclosure mean in this Scholar Rock (SRRK) Form 4?

The filing explains that the reported sale price of $45.1961 per share is a weighted average. The 13,112 shares were sold in multiple trades at prices between $45.00 and $45.45, and detailed breakdowns can be provided to SEC staff upon request.