X0306 4 2017-05-26 0 0000793547 NAVIGATORS GROUP INC NAVG 0001555977 Tizzio Vincent C C/O THE NAVIGATORS GROUP, INC. 400 ATLANTIC STREET, 8TH FLOOR STAMFORD CT 06901 0 1 0 0 CEO & President (NMC) Common Stock 2017-05-26 4 S 0 14680 52.8074 D 21695 D Common Stock 2017-05-30 4 S 0 5320 52.3426 D 16375 D The price reported in Column 4 is a weighed average price. These shares were sold in multiple transactions at prices ranging from $52.70 to $52.95, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (3) to this Form 4. Excludes unvested shares of stock awards over which the Reporting Person does not have voting or dispositive control. The price reported in Column 4 is a weighed average price. These shares were sold in multiple transactions at prices ranging from $52.15 to $52.55, inclusive. Deepa R. Nayini, attorney-in-fact 2017-05-31