X0306 4 2019-02-22 0 0001631650 Aimmune Therapeutics, Inc. AIMT 0001488637 Sheehy Douglas T. AIMMUNE THERAPEUTICS, INC. 8000 MARINA BOULEVARD, SUITE 300 BRISBANE CA 94005-1884 0 1 0 0 See Remarks Common Stock, $0.0001 par value 2019-02-22 4 A 0 12500 0.00 A 45668 D Stock Option (right to buy) 23.72 2019-02-22 4 A 0 75000 0.00 A 2029-02-22 Common Stock 75000 75000 D These shares represent restricted stock units ("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 32,500 restricted stock units ("RSUs") and will be settled in common stock upon vesting. The RSUs vest in four successive, equal, annual installments measured from March 1, 2018, subject to the Reporting Person's continued service relationship with the Issuer on each such vesting date. Includes 89 shares acquired on November 15, 2018 pursuant to Issuer's employee stock purchase plan. 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 February 22, 2019, subject to the Reporting Person's continued service relationship with the Issuer on each such vesting date. General Counsel and Corporate Secretary /s/ Douglas T. Sheehy 2019-02-26