X0306 4 2020-06-22 0 0001631650 Aimmune Therapeutics, Inc. AIMT 0001650322 Dallas Jayson Donald Alexander AIMMUNE THERAPEUTICS, INC. 8000 MARINA BOULEVARD, SUITE 300 BRISBANE CA 94005-1884 1 1 0 0 President and CEO Common Stock, $0.0001 par value 2020-06-22 4 F 0 7907 18.02 D 118676 D The reported sale was made pursuant to a pre-determined election to sell shares to cover tax withholding obligations in connection with the vesting of a previously reported equity award. Includes 3,300 restricted stock units ("RSUs") which will be settled in common stock upon vesting. The RSUs vest as to 100% of the underlying shares on September 11, 2020 (the "Vesting Date"), subject to the Reporting Person's continued service relationship with the Issuer on the Vesting Date. Includes 33,000 RSUs which will be settled in common stock upon vesting. The RSUs vest in three successive, equal, annual installments measured from March 1, 2020 subject to the Reporting Person's continued service relationship with the Issuer on each such vesting date. Includes the balance of 35,000 RSUs which will be settled in common stock upon vesting. The RSUs vest in four successive, equal, annual installments measured from March 1, 2019 subject to the Reporting Person's continued service relationship with the Issuer on each such vesting date. Includes the balance of 60,000 RSUs which will be settled in common stock upon vesting. The RSUs vest in four successive, equal, annual installments measured from June 19, 2018 subject to the Reporting Person's continued service relationship with the Issuer on each such vesting date. /s/ Douglas T. Sheehy, as Attorney-in-Fact for Jayson Donald Alexander Dallas 2020-06-26