X0306 4 2019-09-17 0 0001631650 Aimmune Therapeutics, Inc. AIMT 0001253886 ENRIGHT PATRICK G C/O LONGITUDE CAPITAL PARTNERS II, LLC 2740 SAND HILL ROAD, SECOND FLOOR MENLO PARK CA 94025 1 0 0 0 Common Stock, $0.0001 par value 2019-09-17 4 A 0 12500 22.3373 A 45561 D Common Stock, $0.0001 par value 6013134 I By: LVP2 The price reported in Column 4 is a weighted price. These Shares were purchased in multiple transactions at prices ranging from $22.28 to $22.42 inclusive. Upon request, the Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the SEC full information regarding the Shares purchased at each separate price within the range set forth in this footnote. Reflects shares held by Longitude Venture Partners II, L.P. ("LVP2"). Longitude Capital Partners II, LLC ("LCP2") is the general partner of LVP2 and may be deemed to share voting and investment power over the shares of the Issuer held by LVP2. Patrick G. Enright is a managing member of LCP2 and in his capacity as such may be deemed to share voting and investment power over the shares held by LVP2. Mr. Enright disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. /s/ Douglas T. Sheehy, as Attorney-in-Fact for Patrick G. Enright 2019-09-19