Scholar Rock (SRRK) director’s 3,053-share sale tied to RSU tax obligations

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Scholar Rock Holding Corp director Kristina Burow reported routine insider sales tied to equity compensation. On July 1, 2026, she sold a total of 3,053 shares of common stock in open-market transactions at weighted average prices around $53–$54 per share. According to the filing, these trades were executed under a Rule 10b-5-1 trading plan adopted on March 31, 2026 to cover tax obligations from the vesting and settlement of restricted stock units (RSUs). After these transactions, she continues to hold 107,818 shares of common stock and 6,839 RSUs directly, and has an indirect interest in 2,345,711 shares held by ARCH Venture Fund VIII, L.P., over which she does not have voting or investment control and for which she disclaims beneficial ownership beyond any pecuniary interest.

Insider Trade Summary 10b5-1

Net Seller: 3,053 shares ($164,064)

Net Sell 3 txns

Insider Burow Kristina

Role null

Sold 3,053 shs ($164K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,105	$53.494	$113K
Sale	Common Stock	948	$54.2816	$51K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 115,605 shares (Direct, null); Common Stock — 2,345,711 shares (Indirect, See footnote)

Footnotes (1)

This sale was effected pursuant to a Rule 10b-5-1 trading plan adopted on March 31, 2026 to cover tax obligations upon the vesting and settlement of restricted stock units (RSUs). The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $53.050 to $54.030, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. Consists of 108,766 shares of common stock and 6,839 RSUs. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $54.040 to $54.795, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. Consists of 107,818 shares of common stock and 6,839 RSUs. The shares are held by ARCH Venture Fund VIII, L.P. ("ARCH VIII"). ARCH Venture Partners VIII, L.P. ("GPLP"), as the sole general partner of ARCH VIII, may be deemed to beneficially own the shares held by ARCH VIII. ARCH Venture Partners VIII, LLC ("GPLLC"), as the sole general partner of GPLP, may be deemed to beneficially own the shares held by GPLP. The GPLP and GPLLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of the GPLLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH VIII. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. The Reporting Person is a managing director of the GPLP. The Reporting Person owns an interest in the GPLP but does not have voting or investment control over the shares held by ARCH VIII. The Reporting Person disclaims ownership of such shares, except to the extent of her pecuniary interest therein.

Key Figures

Shares sold: 3,053 shares Sale price (lot 1): $53.4940 per share Sale price (lot 2): $54.2816 per share +4 more

7 metrics

Shares sold 3,053 shares Open-market sales on July 1, 2026

Sale price (lot 1) $53.4940 per share Weighted average for 2,105 shares sold

Sale price (lot 2) $54.2816 per share Weighted average for 948 shares sold

Direct shares after sale 107,818 shares Common stock held directly post-transaction

RSUs outstanding 6,839 RSUs Restricted stock units remaining after transactions

Indirectly held shares 2,345,711 shares Held by ARCH Venture Fund VIII, L.P.

Trading plan adoption date March 31, 2026 Rule 10b-5-1 plan covering these sales

Key Terms

Rule 10b-5-1 trading plan, restricted stock units (RSUs), weighted average price, pecuniary interest, +1 more

5 terms

Rule 10b-5-1 trading plan regulatory

"This sale was effected pursuant to a Rule 10b-5-1 trading plan adopted on March 31, 2026"

restricted stock units (RSUs) financial

"to cover tax obligations upon the vesting and settlement of restricted stock units (RSUs)"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

weighted average price financial

"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

pecuniary interest financial

"disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein"

indirect ownership financial

"The shares are held by ARCH Venture Fund VIII, L.P. ("ARCH VIII")"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/06/2026 - 04:31 PM Accepted by SEC EDGAR 07/06/2026 - 04:30 PM

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).

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^*

Burow Kristina

(Last)

(First)

(Middle)

301 BINNEY STREET

(Street)

CAMBRIDGE

MASSACHUSETTS

02142

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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

X	Form 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	07/01/2026		S		2,105⁽¹⁾	D	$53.494⁽²⁾	115,605⁽³⁾	D
Common Stock	07/01/2026		S		948⁽¹⁾	D	$54.2816⁽⁴⁾	114,657⁽⁵⁾	D
Common Stock								2,345,711	I	See footnote⁽⁶⁾⁽⁷⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. This sale was effected pursuant to a Rule 10b-5-1 trading plan adopted on March 31, 2026 to cover tax obligations upon the vesting and settlement of restricted stock units (RSUs).

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $53.050 to $54.030, 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 108,766 shares of common stock and 6,839 RSUs.

4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $54.040 to $54.795, inclusive. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

5. Consists of 107,818 shares of common stock and 6,839 RSUs.

6. The shares are held by ARCH Venture Fund VIII, L.P. ("ARCH VIII"). ARCH Venture Partners VIII, L.P. ("GPLP"), as the sole general partner of ARCH VIII, may be deemed to beneficially own the shares held by ARCH VIII. ARCH Venture Partners VIII, LLC ("GPLLC"), as the sole general partner of GPLP, may be deemed to beneficially own the shares held by GPLP. The GPLP and GPLLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

7. The managing directors of the GPLLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH VIII. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. The Reporting Person is a managing director of the GPLP. The Reporting Person owns an interest in the GPLP but does not have voting or investment control over the shares held by ARCH VIII. The Reporting Person disclaims ownership of such shares, except to the extent of her pecuniary interest therein.

	/s/ Junlin Ho, attorney-in-fact for Kristina Burow	07/06/2026
	** 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.
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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did SRRK director Kristina Burow report on this Form 4?

Kristina Burow reported selling 3,053 shares of Scholar Rock common stock in open-market trades on July 1, 2026. These sales were made under a Rule 10b-5-1 trading plan and were used to cover tax obligations from vesting restricted stock units.

At what prices did Kristina Burow sell Scholar Rock (SRRK) shares?

She sold 2,105 shares at a weighted average price of $53.4940 and 948 shares at $54.2816. The filing notes these as weighted averages across multiple trades within narrow price ranges disclosed in the footnotes.

Was the SRRK insider sale by Kristina Burow pre-planned under Rule 10b-5-1?

Yes. The filing states the sale was effected pursuant to a Rule 10b-5-1 trading plan adopted on March 31, 2026. The plan’s purpose was to cover tax obligations upon vesting and settlement of restricted stock units, indicating a pre-arranged, compensation-related transaction.

How many Scholar Rock shares does Kristina Burow hold after the reported transactions?

After the reported sales, she directly holds 107,818 shares of Scholar Rock common stock and 6,839 RSUs. These figures come from the footnotes, which break out her direct share count separately from her outstanding restricted stock units.

What is the nature of Kristina Burow’s indirect ownership in Scholar Rock (SRRK)?

An additional 2,345,711 shares are held by ARCH Venture Fund VIII, L.P. Footnotes explain this position flows through related ARCH entities, and Burow has no voting or investment control, disclaiming beneficial ownership except for any pecuniary interest.

Is the July 1, 2026 SRRK insider sale primarily for liquidity or tax purposes?

The filing specifies the trades were executed to cover tax obligations arising from RSU vesting and settlement. This indicates the primary purpose was tax-related rather than a discretionary liquidity sale, and they were executed under a pre-arranged trading plan.