SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Liu Michael K

(Last)

(First)

(Middle)

5601 WEST BUCKEYE ROAD

(Street)

PHOENIX

85043

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2007

3. Issuer Name and Ticker or Trading Symbol
KNIGHT TRANSPORTATION INC [ KNX ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Pres., Dry Van Division

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.01 per share	35.4353	I	Company Sponsored 401(k)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)	10/13/2005	10/12/2010	Common Stock, par value $0.01 per share	844	$2.8518	D
Stock Option (Right to Buy)	09/18/2005	09/17/2010	Common Stock, par value $0.01 per share	3,130	$4.8889	D
Stock Option (Right to Buy)	06/05/2005⁽¹⁾	06/04/2012	Common Stock, par value $0.01 per share	2,475⁽¹⁾	$8.4445	D
Stock Option (Right to Buy)	08/07/2006⁽²⁾	08/06/2013	Common Stock, par value $0.01 per share	3,038⁽²⁾	$11.4356	D
Stock Option (Right to Buy)	03/19/2007⁽³⁾	03/18/2014	Common Stock, par value $0.01 per share	5,063⁽³⁾	$10.5378	D
Stock Option (Right to Buy)	04/26/2008⁽⁴⁾	04/25/2015	Common Stock, par value $0.01 per share	4,500⁽⁴⁾	$14.48	D
Stock Option (Right to Buy)	05/18/2009⁽⁵⁾	05/17/2016	Common Stock, par value $0.01 per share	3,500⁽⁵⁾	$18.75	D
Stock Option (Right to Buy)	05/19/2009⁽⁶⁾	05/18/2016	Common Stock, par value $0.01 per share	1,000⁽⁶⁾	$18.77	D

Explanation of Responses:

1. 1,650 shares of common stock are currently vested; the remaining 825 shares of common stock will vest on June 5, 2007

2. 607 shares of common stock are currently vested; the remaining shares will vest as follows: 608 shares on August 7, 2007; 607 shares on August 7, 2008; 608 shares on August 7, 2009 and 608 shares on August 7, 2010

3. 1,012 shares of common stock are currently vested; the remaining shares will vest as follows: 1,013 shares on March 19, 2008; 1,012 shares on March 19, 2009; 1,013 shares on March 19, 2010 and 1,013 shares on March 19, 2011

4. This option will vest in equal shares of 900 on April 26, 2008, April 26, 2009, April 26, 2010, April 26, 2011 and April 26, 2012

5. This option will vest in equal shares of 700 on May 18, 2009, May 18, 2010, May 18, 2011, May 18, 2012 and May 18, 2013

6. This option will vest in equal shares of 200 on May 19, 2009, May 19, 2010, May 19, 2011, May 19, 2012 and May 19, 2013

Remarks:

	/s/ Michael Liu	04/03/2007
	** Signature of Reporting Person	Date
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 5 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.