Aberdeen Group plc and its subsidiary abrdn Inc. filed an amended beneficial ownership statement with the SEC on November 4, 2026, disclosing a combined 7.03% stake in Equillium, Inc. (NASDAQ:EQ) as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Aberdeen Group plc and abrdn Inc. each report 4,458,351 shares of Equillium common stock beneficially owned.
  • Percent of class: The 4,458,351 shares represent 7.03% of Equillium's outstanding common stock.
  • Voting and dispositive power: Both filers report zero sole voting power and zero sole dispositive power; all 4,458,351 shares are held with shared voting and shared dispositive power.
  • Triggering date: The event requiring this filing occurred on September 30, 2026.
  • Filer structure: Aberdeen Group plc, organized in the United Kingdom, is the parent holding company; abrdn Holdings Limited is the intermediate holding company; abrdn Inc., a United States entity, is the direct beneficial owner on behalf of underlying clients.
  • Amendment number: This is Amendment No. 1 to a previously filed statement.

Aberdeen and abrdn Inc. Disclose Equillium Ownership Through Parent-Subsidiary Structure

According to the filing, Aberdeen Group plc, headquartered at 1 George Street, Edinburgh, United Kingdom, is classified as a parent holding company (type HC). Its U.S. subsidiary, abrdn Inc., located at 1900 Market Street Suite 200, Philadelphia, PA 19103, is classified as a corporation and investment adviser (type CO, IA). The filing states that abrdn Inc. beneficially owns the reported shares on behalf of underlying clients, with Aberdeen Group plc acting as the ultimate parent. abrdn Holdings Limited sits between the two as an intermediate holding company.

The filing covers Equillium, Inc., a company incorporated in the United States with principal executive offices at 2223 Avenida de la Playa, Suite 105, La Jolla, California 92037. The securities disclosed are shares of Equillium common stock with a par value of $0.0001 per share, identified by CUSIP number 29446K106. Both Aberdeen Group plc and abrdn Inc. report identical aggregate beneficial ownership of 4,458,351 shares, equating to 7.03% of the class. The filers certified that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

The statement was signed on October 21, 2026 by Jenny Clarke, identified as Major Shareholding Reporting Analyst, on behalf of both Aberdeen Group plc and abrdn Inc. Items 5, 8, and 9 of the filing were marked not applicable, indicating no dissolution of group and no ownership on behalf of a person outside the disclosed structure beyond what is stated.

What Was Disclosed

Aberdeen Group plc and abrdn Inc. filed Amendment No. 1 disclosing combined beneficial ownership of 4,458,351 shares, or 7.03%, of Equillium, Inc. common stock as of September 30, 2026, with all voting and dispositive power held on a shared basis.