X0306 4 2018-09-05 0 0001091748 Argo Group International Holdings, Ltd. ARGO 0001435222 Bullock Jay Stanley ARGO GROUP INTERNATIONAL HOLDINGS, LTD. 110 PITTS BAY ROAD PEMBROKE, HM 08 D0 BERMUDA 0 1 0 0 Chief Financial Officer Common Stock 2018-09-05 4 M 0 7882 19.36 A 124494 D Common Stock 2018-09-05 4 F 0 2396 63.52 D 122098 D Common Stock 2018-09-05 4 S 0 5486 63.5204 D 116612 D Common Stock 2018-09-06 4 M 0 2978 19.36 A 119590 D Common Stock 2018-09-06 4 F 0 912 63.514 D 118678 D Common Stock 2018-09-06 4 S 0 2066 63.5141 D 116612 D Common Stock 2018-09-07 4 M 0 6892 19.36 A 123504 D Common Stock 2018-09-07 4 F 0 2121 62.95 D 121383 D Common Stock 2018-09-07 4 S 0 4771 63.2814 D 116612 D Stock Appreciation Rights 19.36 2018-09-05 4 M 0 7882 0.00 D 2019-03-15 Common Stock 7882 9870 D Stock Appreciation Rights 19.36 2018-09-06 4 M 0 2978 0.00 D 2019-03-15 Common Stock 2978 6892 D Stock Appreciation Rights 19.36 2018-09-07 4 M 0 6892 0.00 D 2019-03-15 Common Stock 6892 0 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.50 to $63.575, inclusive. The reporting person undertakes to provide to Argo Group International Holdings, Ltd., any security holder of Argo Group International Holdings, Ltd., 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 footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.50 to $63.675, inclusive. The reporting person undertakes to provide to Argo Group International Holdings, Ltd., any security holder of Argo Group International Holdings, Ltd., 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 footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.25 to $63.30, inclusive. The reporting person undertakes to provide to Argo Group International Holdings, Ltd., any security holder of Argo Group International Holdings, Ltd., 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 footnote (3) to this Form 4 The stock appreciation rights vested in four equal annual installments, with the first installment on March 15, 2013. /s/ Craig S. Comeaux, attorney-in-fact 2018-09-07