X0306 4/A 2018-01-31 2018-02-02 0 0001492691 Knight-Swift Transportation Holdings Inc. KNX 0001395069 Liu Michael K 20002 NORTH 19TH AVENUE PHOENIX AZ 85027 0 1 0 0 Exec. VP of Ops, Knight Trans Class A Common Stock 2018-01-31 4 M 0 3200 A 8576 D Class A Common Stock 2018-01-31 4 M 0 923 A 8522 D Restricted Stock Units 0 2018-01-31 4 M 0 3200 0 D 2018-01-31 Class A Common Stock 3200 15600 D Restricted Stock Units 0 2018-01-31 4 M 0 923 0 D 2018-01-31 2018-01-31 Class A Common Stock 923 0 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 rows on the original Form 4 showing the withholding of shares to satisfy tax obligations are not being amended. Therefore, the ultimate beneficial ownership of the reporting person as of January 31, 2018 is presented on the original Form 4. 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