Jonathan D. Root - 09 Nov 2021 Form 4 Insider Report for eFFECTOR Therapeutics, Inc.

Footnote F1

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.57 to $11.82, inclusive for sales on 11/9/21; prices ranging from $10.22 to $10.72, inclusive for sales on 11/10/21; prices ranging from $10.16 to $10.56, inclusive for sales on 11/11/21; and prices ranging from $10.00 to $10.22, inclusive for sales on 11/12/21. The reporting persons undertake to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4

Footnote F2

Presidio Management Group X, L.L.C. ("PMG X"), the general partner of each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates L.P. ("AFF X") (together, the "USVP X Funds"), has sole voting and dispositive power with respect to the shares held by the USVP X Funds. The Reporting Person is a managing member of PMG X with additional rights with respect to the Issuer securities, and may be deemed to have sole voting and dispositive power with respect to the shares. The Reporting Person disclaims beneficial ownership of shares held by the USVP X Funds, except to the extent of any proportionate pecuniary interest therein.