Exhibit 99.1 This Statement on Form 4 is filed by the Reporting Persons listed below. Name of Designated Filer: INVUS PUBLIC EQUITIES, L.P. Date of Event Requiring Statement: February 1, 2021. Issuer Name: Seer, Inc. [SEER] INVUS PUBLIC EQUITIES, L.P. By: INVUS PUBLIC EQUITIES ADVISORS, LLC, its general partner By: /s/ Raymond Debbane ------------------- Name: Raymond Debbane Title: President INVUS PUBLIC EQUITIES ADVISORS, LLC By: /s/ Raymond Debbane ------------------- Name: Raymond Debbane Title: President ARTAL TREASURY LIMITED By: /s/ Keith Le Poidevin --------------------- Name: Keith Le Poidevin Title: Director ARTAL INTERNATIONAL S.C.A. By: ARTAL INTERNATIONAL MANAGEMENT S.A., its managing partner By: /s/ Anne Goffard ---------------- Name: Anne Goffard Title: Managing Director ARTAL INTERNATIONAL MANAGEMENT S.A. By: /s/ Anne Goffard ---------------- Name: Anne Goffard Title: Managing Director ARTAL GROUP S.A. By: /s/ Anne Goffard ---------------- Name: Anne Goffard Title: Authorized Person WESTEND S.A. By: /s/ Anne Goffard ---------------- Name: Anne Goffard Title: Managing Director STICHTING ADMINISTRATIEKANTOOR WESTEND By: /s/ Amaury Wittouck ------------------- Name: Amaury Wittouck Title: Sole Member of the Board MR. AMAURY WITTOUCK By: /s/ Amaury Wittouck -------------------