Amendment: SEC Form SC 13D/A filed by Viridian Therapeutics Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 6)

Viridian Therapeutics, Inc.

(Name of Issuer)

Common Stock, $0.01 par value

(Title of Class of Securities)

92790C 104

(CUSIP Number)

Ms. Erin O’Connor

Fairmount Funds Management LLC

200 Barr Harbor Drive, Suite 400

West Conshohocken, PA 19428

(267) 262-5300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

-with copy to-

Ryan A. Murr

Gibson, Dunn & Crutcher LLP

One Embarcadero Center Suite 2600

San Francisco, CA 94111

September 13, 2024

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box ☐.

CUSIP No. 92790C104

CUSIP No. 92790C104

CUSIP No. 92790C104

This Amendment No. 6 amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission on January 5, 2021, Amendment No. 1 filed on September 23, 2021, Amendment No. 2 filed on August 19, 2022, Amendment No. 3 filed on November 3, 2023, Amendment No. 4 filed on January 24, 2024 and Amendment No. 5 filed on April 1, 2024 (as amended, the “Statement” or the “Schedule 13D”) by the Reporting Persons with respect to the common stock, $0.01 par value (“Common Stock”), of Viridian Therapeutics, Inc. (the “Company”). Unless otherwise defined herein, capitalized terms used in this Amendment No. 6 shall have the meanings ascribed to them in the Statement. Unless amended or supplemented below, the information in the Statement remains unchanged. The address of the principal executive offices of the Company is 221 Crescent Street, Suite 401, Waltham, MA 02453.

Fairmount serves as investment manager for Fairmount Healthcare Fund II LP (“Fund II”) and may be deemed a beneficial owner for purposes of Section 13(d) of the Securities Exchange Act of 1934 (the “Act”) of any securities of the Company held by Fund II. Fund II has delegated to Fairmount the sole power to vote and the sole power to dispose of all securities held in Fund II’s portfolio, including the shares of Common Stock, Series A Preferred Stock and Series B Preferred Stock reported herein. Because Fund II has divested itself of voting and investment power over the reported securities it holds and may not revoke that delegation on less than 61 days’ notice, Fund II disclaims beneficial ownership of the securities it holds for purposes of Section 13(d) of the Act and therefore disclaims any obligation to report ownership of the reported securities under Section 13(d) of the Act. The general partner of Fairmount is Fairmount Funds Management GP LLC (“Fairmount GP”). Fairmount and Fairmount GP disclaim beneficial ownership of the securities reported in this Amendment No. 6 other than for the purpose of determining their obligations under Section 13(d) of the Act, and the filing of this Amendment No. 6 shall not be deemed an admission that any of Fairmount or Fairmount GP is the beneficial owner of such securities for any other purpose.

Item 3 of the Statement is hereby amended and supplemented as follows:

In aggregate, the Reporting Persons have voting and dispositive power over 15,556,685 shares of Common Stock of the Company, which is comprised of (a) 3,445,813 shares of Common Stock, and (b) 12,110,872.18 (rounded to 12,110,872 shares for purposes of reporting in this Schedule 13D) shares of Common Stock issuable upon conversion of 133,191 shares of Series A Preferred Stock and 48,463 shares of Series B Preferred Stock, the conversion of which is subject to a beneficial ownership limitation of 19.99% of the outstanding Common Stock. On September 13, 2024, Fund II purchased a total of 1,600,000 shares of Common Stock of the Company for an aggregate of $30,000,000.00 in an underwritten public offering (the “Offering”). The shares were purchased with working capital. Fairmount and Fairmount GP II do not own any shares of Common Stock, Series A Preferred Stock or Series B Preferred Stock directly. Fairmount and Fairmount GP II are deemed to beneficially own the shares Common Stock, Series A Preferred Stock and Series B Preferred Stock held by Fund II. Fairmount and Fairmount GP II disclaim beneficial ownership of such shares of Common Stock, Series A Preferred Stock and Series B Preferred Stock except to the extent of their pecuniary interest therein.

Item 4 is hereby amended and supplemented as follows:

Fund II purchased the shares of Common Stock referenced in Item 3 for investment purposes.

Lock-up Agreement

Pursuant to lock-up agreements signed in connection with the Offering, the Reporting Persons and each director and officer of the Company agreed with the representatives of the underwriters, subject to specified exceptions, not to directly or indirectly offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of any shares of Common Stock beneficially owned (as such term is used in Rule 13d-3 of the Exchange Act) or any other securities so owned that are convertible into or exercisable or exchangeable for Common Stock; or dispose of any shares of Common Stock, options to acquire shares of Common Stock, or securities exchangeable or exercisable for or convertible into shares of Common Stock currently or hereafter owned either of record or beneficially. This restriction terminates after the close of trading of the Common Stock on and including the 60th day after the date of the prospectus supplement relating to the Offering.

The percentages used in this Schedule 13D are calculated based upon 74,556,520 shares of Common Stock outstanding, consisting of 63,889,920 shares of Common Stock outstanding as of August 5, 2024 plus 10,666,600 shares of Common Stock sold in the Offering. The Reporting Persons’ securities include (a) 3,445,813 shares of Common Stock and (b) 12,110,872.18 (rounded to 12,110,872 shares for purposes of reporting in this Schedule 13D) shares of Common Stock issuable upon conversion of 133,191 shares of Series A Preferred Stock and 48,463 shares of Series B Preferred Stock, the conversion of which is subject to a beneficial ownership limitation of 19.99% of the outstanding Common Stock.

Fairmount is the investment manager or adviser to Fund II and has voting and dispositive power over shares of Common Stock held on behalf of Fund II. Fairmount GP II serves as the general partner to Fund II and is deemed to share voting and dispositive power over shares of Common Stock held on behalf of Fund II in its capacity as general partner.

The following table lists the Reporting Persons’ transaction in Common Stock that was effected in the sixty days prior to the filing of this Amendment No. 6:

The Reporting Persons did not effect any transactions in shares of Series A Preferred Stock or Series B Preferred Stock in the sixty days prior to the filing of this Amendment No. 6.

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, we certify that the information set forth in this statement as of September 17, 2024.