X0306 4 2018-05-17 1 0000896159 Chubb Ltd CB 0001192205 MULLIN LEO F 710 FAIRFIELD ROAD ATLANTA GA 30327 1 0 0 0 Common Shares 2018-05-17 4 F 0 307 134.45 D 19707.99 D Common Shares being withheld in order to pay tax liability. Total includes 106.79 shares credited at various times between July 2017 and April 2018 to the reporting person's deferred stock account pursuant to the dividend investment provisions of the Plan which meets the requirements of Rule 16b-3. /s/ Samantha Froud, Attorney-in-fact 2018-05-21