X0306 4/A 2018-01-31 2018-02-02 0 0001492691 Knight-Swift Transportation Holdings Inc. KNX 0001187342 KNIGHT KEVIN P 20002 NORTH 19TH AVENUE PHOENIX AZ 85027 1 1 0 0 Executive Chairman Class A Common Stock 2018-01-31 4 M 0 4000 A 21301 D Class A Common Stock 2742577 I Trust Restricted Stock Units 0 2018-01-31 4 M 0 4000 0 D 2018-01-31 Class A Common Stock 4000 19500 D This row is being amended to show that the shares were acquired upon the conversion of restricted stock units (changing from transaction code "A" to transaction code "M"). The row in the original Form 4 reporting the withholding of shares to satisfy tax obligations is not being amended. Therefore, the ultimate beneficial ownership of the reporting person as of January 31, 2018 is presented in the original Form 4. This row is also amended to calrify the number of shares the reporting person owned directly after the transaction. This row is added to clarify the number of shares owned indirectly by the reporting person after the transaction. This row is added to show the conversion of restricted stock units upon vesting. The remaining restricted stock units for this grant vest as follows: approximately 20.5% on January 31, 2019, approximately 18% on January 31, 2020, and approximately 20.5% on each of January 31, 2021, 2022, and 2023. /s/ Jessica Benford, Attorney-in-Fact 2018-04-11