X0202 SCHEDULE 13G 0001716774 XXXXXXXX LIVE Common Stock, $0.0001 Par Value 04/01/2026 0001746466 Equillium, Inc. 29446K106 2223 AVENIDA DE LA PLAYA SUITE 105 LA JOLLA, CALIFORNIA CA 92037 Rule 13d-1(b) Aberdeen Group plc X0 0 3352837 0 3352837 3352837 N 5.3 HC abrdn Inc. X1 0 3352837 0 3352837 3352837 N 5.3 CO IA Equillium, Inc. 2223 AVENIDA DE LA PLAYA, SUITE 105, LA JOLLA, CALIFORNIA, CALIFORNIA 92037 Aberdeen Group plc abrdn Inc. Aberdeen Group plc 1 George Street Edinburgh, United Kingdom EH2 2LL abrdn inc 1900 Market Street Suite 200. Philadelphia, PA 19103 Aberdeen Group plc - UNITED KINGDOM abrdn Inc. - UNITED STATES N HC 3,352,837 5.30 Aberdeen Group plc - 0 abrdn Inc. - 0 Aberdeen Group plc - 3,352,837 abrdn Inc. - 3,352,837 Aberdeen Group plc - 0 abrdn Inc. - 0 Aberdeen Group plc - 3,352,837 abrdn Inc. - 3,352,837 Y Y N See Exhibit Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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 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, other than activities solely in connection with a nomination under ?? 240.14a-11. Aberdeen Group plc abrdn Holdings Limited abrdn Inc. Aberdeen Group plc is the parent company. abrdn Holdings Limited is the intermediate holding company for abrdn Inc. abrdn Inc. beneficially owns on behalf of our underlying clients 5% or greater of the outstanding shares of the security class being reported on this Schedule 13G. Aberdeen Group plc R.Chaudhry 05/07/2026 abrdn Inc. R.Chaudhry 05/07/2026