X0306 4 2016-11-30 0 0001666138 Atkore International Group Inc. ATKR 0001674890 Williamson John Patrick 16100 SOUTH LATHROP AVENUE HARVEY IL 60426 1 1 0 0 President and CEO Common Stock 2016-11-30 4 A 0 28555 0.00 A 165555 D Stock Options (right to buy) 21.45 2016-11-30 4 A 0 69287 0.00 A 2026-11-30 Common Stock 69287 69287 D Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 30, 2016, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs. Represents stock options. The options vest and become exercisable ratably in three installments on each anniversary of November 30, 2016, subject to continued employment. /s/ Daniel S. Kelly, Attorney-in-Fact for John Patrick Williamson 2016-12-02