X0306 4 2020-02-28 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 2020-02-28 4 A 0 33000 0.00 A 123699 D Stock Option (right to buy) 23.81 2020-02-28 4 A 0 200000 0.00 A 2030-02-28 Common Stock 200000 200000 D These shares represent restricted stock units ("RSUs") and 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 35,000 RSUs and 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 60,000 RSUs and 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. The shares subject to the option will vest and become exercisable as to 1/48th of the total number of shares subject to the option in successive, equal monthly installments measured from March 1, 2020, 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 2020-03-03