X0306 4 2018-03-05 0 0000793547 NAVIGATORS GROUP INC NAVG 0001241969 EISDORFER R SCOTT C/O THE NAVIGATORS GROUP, INC. 400 ATLANTIC STREET, 8TH FLOOR STAMFORD CT 06901 0 1 0 0 SVP,Chief Administrative Offic Common Stock 2018-03-05 4 A 0 4572 0.00 A 43517 D Common Stock 2018-03-05 4 F 0 2076 55.65 D 41441 D Performance Units 2018-03-05 4 M 0 6000 0.00 D Common Stock 0 D Vesting of performance units grant, which was previously reported. Excludes unvested shares of stock awards over which the Reporting Person does not have voting or dispositive control. Shares withheld to satisfy tax obligation arising out of vesting of performance units. Vested in a range from 50% to 150% based on the attainment of certain performance targets over a three-year period ending December 31, 2017, which vesting is reported in this Form 4. The grant was previously reported as for 3,000 performance units, but was adjusted to reflect the stock dividend declared by the Board of Directors of the Issuer on December 6, 2016. Deepa R. Nayini, attorney-in-fact 2018-03-07