UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934*

(Amendment No. 1)

Solid Biosciences Inc.

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

83422E204

(CUSIP Number)

July 25, 2024

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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Explanatory Note

On July 25, 2024, in connection with a reorganization (the “Reorganization”), Global Management replaced the Geneva branch of Artal International as the managing member of Invus PE Advisors (each defined below). Siren (defined below) is the managing member of Global Management and Mr. Raymond Debbane is the managing member of Siren. Accordingly, Artal International, Artal International Management, Artal Group, Westend, the Stichting and Mr. Amaury Wittouck (each defined below and together, the “Artal Parties”) are no longer deemed to beneficially own the Shares directly held by Invus Public Equities (defined below). This Schedule 13G reports beneficial ownership as of July 25, 2024, immediately following the Reorganization, and reflects an exit filing by the Artal Parties and an initial filing on Schedule 13G by Global Management, Siren and Mr. Debbane. See Item 4.

Solid Biosciences Inc. (the “Issuer”)

500 Rutherford Avenue, Third Floor, Charlestown, MA 02129

(i) Invus Public Equities, L.P. (“Invus Public Equities”)

750 Lexington Avenue, 30th Floor, New York, NY 10022

Citizenship: Bermuda limited partnership

(ii) Invus Public Equities Advisors, LLC (“Invus PE Advisors”)

750 Lexington Avenue, 30th Floor, New York, NY 10022

Citizenship: Delaware limited liability company

(iii) Invus Global Management, LLC (“Global Management”)

750 Lexington Avenue, 30th Floor, New York, NY 10022

Citizenship: Delaware limited liability company

(iv) Siren, L.L.C. (“Siren”)

c/o The Invus Group, LLC, 750 Lexington Avenue, 30th Floor, New York, NY 10022

Citizenship: Delaware limited liability company

(v) Raymond Debbane

750 Lexington Avenue, 30th Floor, New York, NY 10022

Citizenship: Panama

(vi) Artal International S.C.A. (“Artal International”)

Valley Park, 44, Rue de la Vallée, L-2661, Luxembourg

Citizenship: Luxembourg limited partnership

(vii) Artal International Management S.A. (“Artal International Management”)

Valley Park, 44, Rue de la Vallée, L-2661, Luxembourg

Citizenship: Luxembourg société anonyme

(viii) Artal Group S.A. (“Artal Group”)

Valley Park, 44, Rue de la Vallée, L-2661, Luxembourg

Citizenship: Luxembourg société anonyme

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(ix) Westend S.A. (“Westend”)

Valley Park, 44, Rue de la Vallée, L-2661, Luxembourg

Citizenship: Luxembourg société anonyme

(x) Stichting Administratiekantoor Westend (the “Stichting”)

Claude Debussylaan, 46, 1082 MD Amsterdam, The Netherlands

Citizenship: Netherlands foundation

(xi) Mr. Amaury Wittouck

Valley Park, 44, Rue de la Vallée, L-2661, Luxembourg

Citizenship: Belgium

The foregoing persons are hereinafter sometimes collectively referred to as the “Reporting Persons.”

Common Stock, $0.001 par value per share (the “Shares”)

83422E204

This Item 3 is not applicable.

(a) Amount beneficially owned:

As of July 25, 2024, following the Reorganization whereby Global Management became the managing member of Invus PE Advisors, Invus Public Equities directly held 2,508,143 Shares. Invus PE Advisors, as the general partner of Invus Public Equities, controls Invus Public Equities and, accordingly, may be deemed to beneficially own the Shares directly held by Invus Public Equities. Global Management, as the managing member of Invus PE Advisors, controls Invus PE Advisors and, accordingly, may be deemed to beneficially own the Shares that Invus PE Advisors may be deemed to beneficially own. Siren, as the managing member of Global Management, controls Global Management and, accordingly, may be deemed to beneficially own the Shares that Global Management may be deemed to beneficially own. Mr. Raymond Debbane, as the managing member of Siren, controls Siren and, accordingly, may be deemed to beneficially own the Shares that Siren may be deemed to beneficially own.

(b) Percent of class:

As of July 25, 2024, following the Reorganization, each of the Reporting Persons may be deemed to be the beneficial owner of the percentage of Shares listed on such Reporting Person’s cover page. Calculations of the percentage of Shares beneficially owned are based on 38,379,413 Shares outstanding as of May 10, 2024 as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 15, 2024.

(c) Number of shares as to which Invus Public Equities, Invus PE Advisors, Global Management, Siren and Mr. Debbane has:

(i) Sole power to vote or to direct the vote:

2,508,143

(ii) Shared power to vote or to direct the vote:

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(iii) Sole power to dispose or to direct the disposition of:

2,508,143

(iv) Shared power to dispose or to direct the disposition of:

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As of July 25, 2024, following the Reorganization, Artal International, Artal International Management, Artal Group, Westend, the Stichting and Mr. Wittouck are no longer deemed to beneficially own any Shares.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☐.

On July 25, 2024, in connection with the Reorganization, Global Management replaced the Geneva branch of Artal International as the managing member of Invus PE Advisors. Accordingly, the Geneva branch of Artal International, Artal International Management, Artal Group, Westend, Stichting and Mr. Wittouck are no longer deemed to beneficially own the Shares directly held by Invus Public Equities and have ceased to be Reporting Persons.

This Item 6 is not applicable.

This Item 7 is not applicable.

This Item 8 is not applicable.

This Item 9 is not applicable.

Each of the Reporting Persons hereby makes the following certification:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the Issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: August 2, 2024

EXHIBIT INDEX

EXHIBIT 1

JOINT FILING AGREEMENT

The undersigned agree that the statement on Schedule 13G with respect to the securities of Solid Biosciences Inc. is, and any amendments thereto signed by each or any of the undersigned shall be, filed on behalf of each of such person pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated: August 2, 2024