X0306 4 2017-01-27 0000008670 AUTOMATIC DATA PROCESSING INC ADP 0001562392 Ayala John ONE ADP BOULEVARD ROSELAND NJ 07068 1 Corp. VP Common Stock 2017-01-27 4 M 0 10239.0000 52.6460 A 24773.5810 D Common Stock 2017-01-27 4 M 0 7962.0000 69.7170 A 32735.5810 D Common Stock 2017-01-27 4 M 0 6241.0000 86.6100 A 38976.5810 D Common Stock 2017-01-27 4 S 0 24028.0000 101.4400 D 14948.5810 D Stock Option (Right to Buy) 86.6100 2017-01-27 4 M 0 6241.0000 86.6100 D 2016-01-22 2025-01-21 Common Stock 6241.0000 6241.0000 D Stock Option (Right to Buy) 69.7170 2017-01-27 4 M 0 7962.0000 69.7170 D 2015-01-23 2024-01-22 Common Stock 7962.0000 3983.0000 D Stock Option (Right to Buy) 52.6460 2017-01-27 4 M 0 10239.0000 52.6460 D 2014-01-25 2023-01-24 Common Stock 10239.0000 0.0000 D The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2016 Michael A. Bonarti (POA on file) 2017-01-31