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  4. [Form 4] Scholar Rock Holding Corp Insider Trading Activity

Scholar Rock CSO disposes 3,353 shares under Rule 10b5-1 at ~$30.67

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Mo Qatanani, Chief Scientific Officer of Scholar Rock Holding Corp (SRRK), reported an insider sale on a Form 4. On 09/22/2025 the reporting person sold 3,353 shares of Scholar Rock common stock at a weighted average price of $30.6729 under a Rule 10b5-1 trading plan adopted March 31, 2025. After the sale the reporting person beneficially owns 108,964 shares represented by RSUs. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person and filed on 09/24/2025. The filing discloses the sale occurred in multiple transactions at prices ranging from $30.33 to $30.85, and the weighted average reflects those executions.

Positive

  • Sale executed under a Rule 10b5-1 trading plan, indicating pre-planned, non-discretionary trades
  • Clear disclosure of execution details: number of shares sold (3,353), weighted average price ($30.6729), and price range ($30.33–$30.85)
  • Filing appears timely and properly signed by an attorney-in-fact, supporting compliance

Negative

  • None.

Insights

TL;DR: A routine, pre-established Rule 10b5-1 sale by the CSO; transparent disclosure, no new material corporate developments.

The reported disposal of 3,353 shares was executed under a Rule 10b5-1 plan, which typically indicates pre-planned, non-discretionary trades and reduces the likelihood the sale signals new company-specific negative information. The filing clearly states the weighted average sale price and the execution price range, and it reports remaining beneficial ownership as 108,964 RSUs. From an investor perspective the disclosure is procedurally complete and timely; it documents insider liquidity but does not itself provide evidence of a change in company fundamentals.

TL;DR: Proper use of an attorney-in-fact and 10b5-1 plan shows governance and compliance adherence in insider trading disclosure.

The Form 4 shows appropriate governance controls: the trade was executed under a documented 10b5-1 plan adopted March 31, 2025, and the filing was signed by an authorized attorney-in-fact. The report includes necessary details: transaction date, number of shares sold, weighted average price, price range, and post-transaction beneficial ownership in RSUs. This level of disclosure supports regulatory compliance and transparency regarding insider transactions.

Insider Qatanani Mo
Role CHIEF SCIENTIFIC OFFICER
Sold 3,353 shs ($103K)
Type Security Shares Price Value
Sale Common Stock 3,353 $30.6729 $103K
Holdings After Transaction: Common Stock — 108,964 shares (Direct)
Footnotes (1)
  1. This transaction was effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted on March 31, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.33 to $30.85, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. Consists of 108,964 RSUs.
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Form 4 Insider Transactions: What Each Field Means →
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).
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)
09/22/2025
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 09/22/2025 S 3,353(1) D $30.6729(2) 108,964(3) 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
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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.33 to $30.85, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.
3. Consists of 108,964 RSUs.
/s/ Junlin Ho, Attorney-in-Fact for Mo Qatanani 09/24/2025
** 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.
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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did SRRK Chief Scientific Officer report on Form 4?

The CSO, Mo Qatanani, reported selling 3,353 shares of Scholar Rock common stock on 09/22/2025 under a Rule 10b5-1 plan.

At what price were the SRRK shares sold in the Form 4 filing?

The shares were sold at a weighted average price of $30.6729, with individual executions ranging from $30.33 to $30.85.

How many SRRK shares does the reporting person beneficially own after the transaction?

The filing states the reporting person beneficially owns 108,964 shares, consisting of RSUs.

Was the sale part of a pre-established trading plan for SRRK insider trades?

Yes. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on March 31, 2025.

Who signed the Form 4 filing for the SRRK insider transaction?

The Form 4 was signed by Junlin Ho, Attorney-in-Fact, on behalf of Mo Qatanani and dated 09/24/2025.