Scholar Rock Holding SEC Filings

Samsara-affiliated investors increased and reshuffled holdings in Scholar Rock Holding Corp (SRRK). The group—Samsara BioCapital, L.P., its GP entities, Samsara Opportunity Fund and Dr. Srinivas Akkaraju—reports combined beneficial ownership of 6,991,553 shares, representing 7.2 of the outstanding common stock on the filing date. The amendment discloses an internal private sale on 10/03/2025 where Samsara Opportunity Fund bought 276,578 shares from Samsara LP for $37.44 per share ($10,355,080.32 total) and multiple open-market purchases on 10/03/2025 and 10/06/2025 at weighted-average prices between $35.61 and $39.52 per share. The filing confirms voting and dispositive power structures: Samsara GP and Samsara Opportunity GP and Dr. Akkaraju control voting for the partnership-held shares. The disclosure updates prior Schedule 13D filings and attaches a joint filing agreement.

Srinivas Akkaraju, a director, reported multiple purchases of Scholar Rock Holding Corp (SRRK) common stock in early October 2025. The filings show net additions through affiliated vehicles, primarily Samsara Opportunity Fund, L.P., bringing the fund's reported beneficial ownership to 500,439 shares following purchases executed on 10/03/2025 and 10/06/2025. Purchase prices are disclosed as weighted averages across multiple trades, with reported ranges from $35.14 up to $39.84 depending on the tranche. The report also notes prior shares held by Samsara BioCapital, L.P. and contains standard disclaimers that the reporting person disclaims beneficial ownership except to the extent of pecuniary interest.

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.

Scholar Rock Holding Corp (SRRK) filed a Form 144 disclosing a proposed sale of 3,353 common shares through J.P. Morgan Securities LLC on 09/22/2025 with an aggregate market value of $102,846. The shares were acquired on 09/15/2025 as a restricted stock award from the issuer and were paid for on the acquisition date. The filing reports 67,122,987 shares outstanding for the class. The notice also lists a prior sale on 07/08/2025 where Mohammed Qatanani sold 24,066 shares for gross proceeds of $828,897. The filer affirms they are not aware of undisclosed material adverse information and references Rule 10b5-1 trading plan disclosure language.

Katie Peng, a director of Scholar Rock Holding Corp (SRRK), reported sales of common stock on 09/16/2025 under a Rule 10b5-1 plan adopted 11/20/2024 to cover tax obligations from RSU vesting. The filing shows two sale events: 930 shares sold at a weighted average price of $32.4761 and 76 shares sold at a weighted average price of $33.1963, executed in multiple transactions at prices ranging $31.85–$33.73. After these sales Ms. Peng beneficially owns 33,990 shares following the first reported sale and 33,914 shares following the second, held directly and including unvested RSUs. The Form 4 was signed by an attorney-in-fact on 09/17/2025.

Insider transaction summary for Scholar Rock Holding Corp (SRRK): The reporting person, Mo Qatanani, Chief Scientific Officer, completed a sell-to-cover transaction on 09/16/2025 disposing of 3,178 shares of common stock at $33.52 per share to satisfy tax withholding arising from RSU vesting. After the transaction, the reporting person beneficially owns 112,317 shares, comprised of 3,353 issued shares and 108,964 unvested restricted stock units that vest over four years from grant dates in 2021 and 2022. The sell-to-cover was executed by a brokerage firm as required under the issuer's equity plan and was not a discretionary trade by the reporting person.

Form 144 filed for Scholar Rock Holding Corp (SRRK) reporting a proposed sale of 1,006 shares of common stock through J.P. Morgan Securities LLC on 09/16/2025. The filing shows an aggregate market value of $32,726 for the shares, with 96,127,265 shares outstanding. The securities to be sold were acquired as restricted stock units: 261 shares on 08/15/2025 and 745 shares on 09/15/2025, with payment indicated as NA. No sales by the reporting person in the prior three months are reported. The filing includes the required representation that the seller does not possess undisclosed material adverse information.

Caryn Parlavecchio, Chief Human Resources Officer of Scholar Rock Holding Corp (SRRK), reported a non-discretionary sale of common stock on 08/18/2025 to cover tax withholding for vested restricted stock units (RSUs). The Form 4 shows 2,178 shares were sold at $31.1663 per share as a mandatory "sell-to-cover" tied to RSUs that vested on 08/15/2025. After the transaction the reporting person beneficially owned 155,464 shares in total, comprising 66,222 common shares and 89,242 RSUs. The filing was signed by an attorney-in-fact on 08/19/2025.