Sec Form 4/A Filing - Carlson Todd F. @ KNIGHT TRANSPORTATION INC - 2017-09-08

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Carlson Todd F. 2. Issuer Name and Ticker or Trading Symbol KNIGHT TRANSPORTATION INC [ KNX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) General Counsel and Secretary (Last) (First) (Middle) 20002 NORTH 19TH AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 09/08/2017 (Street) PHOENIX, AZ85027 4. If Amendment, Date Original Filed (MM/DD/YY) 09/12/2017 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock ( 1 ) 09/08/2017 D 7,257 D 0 I Trust Common Stock ( 1 ) 09/08/2017 D 13,381 D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Performance Units ( 3 ) ( 4 ) 09/0 8/2017 D 2,845 ( 4 ) ( 4 ) 01/31/2019( 4 ) Common Stock 2,845 ( 4 ) $ 0 0 D Restricted Stock Performance Units ( 3 ) ( 4 ) 09/08/2017 D 3,508 ( 4 ) ( 4 ) 01/31/2020( 4 ) Common Stock 3,508 ( 4 ) $ 0 0 D Restricted Stock Units ( 3 ) $ 0 09/08/2017 D 7,050 ( 5 ) ( 5 ) Common Stock 7,050 $ 0 0 D Restricted Stock Units ( 3 ) $ 0 09/08/2017 D 1,000 ( 6 ) ( 6 ) Common Stock 1,000 $ 0 0 D Restricted Stock Units ( 3 ) $ 0 09/08/2017 D 2,800 ( 7 ) ( 7 ) Common Stock 2,800 $ 0 0 D Restricted Stock Units ( 3 ) $ 0 09/08/2017 D 3,748 ( 8 ) ( 8 ) Common Stock 3,748 $ 0 0 D Employee Stock Option (Right to Buy) ( 3 ) $ 14.79 09/08/2017 D 9,000 ( 9 ) 11/25/2017 Common Stock 9,000 $ 0 0 D Employee Stock Option (Right to Buy) ( 3 ) $ 17.29 09/08/2017 D 5,000 ( 10 ) 05/21/2018 Common Stock 5,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Carlson Todd F. 20002 NORTH 19TH AVENUE PHOENIX, AZ85027 General Counsel and Secretary Signatures /s/ Jessica Benford, Attorney-in-Fact 04/11/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This row is being amended to clarify the direct and indirect ownership of the shares disposed of in the transaction reported in the original Form 4. ( 2 )Disposed of pursuant to Agreement and Plan of Merger, dated April 9, 2017, by and among Swift Transportation Company, Bishop Merger Sub, Inc., and the issuer (the "Merger Agreement"), providing that all shares of issuer shall be exchanged for an equal number of shares of Knight-Swift Transportation Holdings Inc., such exchanged shares having a market value of $40.85 per share on the effective date of the merger. ( 3 )This row is added to show disposition of derivative securities pursuant to the Merger Agreement. The derivate securities were assumed and replaced by Swift Transportation Company (renamed Knight-Swift Transportation Holdings Inc.). ( 4 )The number of underlying securities is subject to adjustment based on the level of achievement for specified performance targets measured over a performance period ending on December 31, 2017. The shares underlying this award vested as of September 8, 2017. ( 5 )The remaining restricted stock units for this grant were scheduled to vest as follows: approximately 17% on January 31, 2018, approximately 17% on January 31, 2019, approximately 15% on January 31, 2020, and approximately 17% on each of January 31, 2021, 2022, and 2023. ( 6 )The remaining restricted stock units for this grant were scheduled to vest on January 31, 2018. ( 7 )The remaining restricted stock units for this grant were scheduled to vest in two equal annual installments beginning on January 31, 2018. ( 8 )This restricted stock unit grant was scheduled to vest in five equal annual installments beginning on May 31, 2018. ( 9 )This option vested in three equal annual installments beginning on November 26, 2010. ( 10 )This option vested in five equal annual installments beginning on May 22, 2011.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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