Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P., and James E. Flynn filed a Schedule 13G with the SEC on October 28, 2026, disclosing beneficial ownership of common stock in Climb Bio, Inc. as of October 27, 2026.

Key Highlights

  • Triggering event: The date of the event requiring this filing was October 27, 2026.
  • Beneficial ownership: Each of the four reporting persons discloses beneficial ownership of 3,070,000 shares of Climb Bio, Inc. common stock.
  • Percent of class: The 3,070,000 shares represent 5.25% of the class for each reporting person.
  • Voting and dispositive power: All reporting persons report 0 sole voting power and 0 sole dispositive power; each reports 3,070,000 shares of shared voting power and 3,070,000 shares of shared dispositive power.
  • Share holder of record: According to the filing, the shares are held by Deerfield Partners, L.P., of which Deerfield Mgmt, L.P. is the general partner and Deerfield Management Company, L.P. is the investment advisor.
  • Certification: The filing certifies that the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

Deerfield Entities and James E. Flynn Report 3,070,000 Shares in Climb Bio

According to the Schedule 13G filed October 28, 2026, four related reporting persons - Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P., and James E. Flynn - each report beneficial ownership of 3,070,000 shares of common stock of Climb Bio, Inc. (CUSIP 28658R106). The issuer is identified as Climb Bio, Inc., with principal executive offices at 20 William Street, Suite G50, Wellesley Hills, MA 02481. The filing does not specify an exchange or ticker symbol for the issuer in the filing text itself.

The filing discloses that the shares are physically held by Deerfield Partners, L.P. Deerfield Mgmt, L.P. is described as the general partner of Deerfield Partners, L.P., while Deerfield Management Company, L.P. is identified as its investment advisor. James E. Flynn, a United States citizen, is also listed as a reporting person, with his beneficial ownership comprised of shares held by Deerfield Partners, L.P. All three Deerfield entities are organized as Delaware limited partnerships. All reporting persons share both voting and dispositive power over the 3,070,000 shares; none holds any sole voting or sole dispositive authority.

The 3,070,000 shares represent 5.25% of the class, as reported in the filing. The signing parties - Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P., and James E. Flynn - each signed through Jonathan Isler as Attorney-In-Fact on October 28, 2026. The filing references a Joint Filing Agreement (Exhibit A), an Item 8 Statement (Exhibit B), and a Power of Attorney (Exhibit C) previously filed as Exhibit 24 to a Form 3 on March 19, 2024.

What Was Disclosed

The Schedule 13G discloses that four Deerfield-affiliated reporting persons each hold beneficial ownership of 3,070,000 shares of Climb Bio, Inc. common stock, representing 5.25% of the class, as of October 27, 2026, with all voting and dispositive power held on a shared basis.