FORM 4 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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * LAWRENCE CHARLES BERDON   2. Issuer Name and Ticker or Trading Symbol KIRBY CORP [KEX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 55 WAUGH DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 05/03/2010 (Street) HOUSTON, TX 77007 4. If Amendment, Date 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 (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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, par value $.10 per share 05/03/2010   S   17,045 D $ 42.89 (1) 67,182 I Partnership (3) Common Stock, par value $.10 per share 05/03/2010   S   57,955 D $ 42.89 (1) 312,045 I Trusts (4) Common Stock, par value $.10 per share 05/04/2010   S   3,270 D $ 42.0056 (2) 63,912 I Partnership (3) Common Stock, par value $.10 per share 05/04/2010   S   11,130 D $ 42.0056 (2) 300,915 I Trusts (4) Common Stock, par value $.10 per share               636,341 D   Common Stock, par value $.10 per share               10,024 I 401K Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LAWRENCE CHARLES BERDON 55 WAUGH DRIVE HOUSTON, TX 77007	X

Signatures

G. Stephen Holcomb, Agent and Attorney-in-Fact		05/05/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The reported price is the weighted average purchase price. The purchases were made at prices ranging from $42.70 to $43.08 per share. The reporting person will provide, upon request by the Commission staff, the issuer or a stockholder of the issuer, full information regarding the number of shares purchased at each separate price.
(2)	The reported price is the weighted average purchase price. The purchases were made at prices ranging from $41.72 to $42.38 per share. The reporting person will provide, upon request by the Commission staff, the issuer or a stockholder of the issuer, full information regarding the number of shares purchased at each separate price.
(3)	The reported shares are held by Lawrence Family Interests, LP, a limited partnership of which entities wholly owned by Mr. Lawrence and his wife are the general partners and of which Mr. Lawrence's children and trusts for their benefit are the limited partners. Mr. Lawrence disclaims beneficial ownership of the shares owned by the limited partnership except to the extent of his pecuniary interest in such shares.
(4)	These shares are owned by trusts for the benefit of members of Mr. Lawrence's family. Mr. Lawrence is not a beneficiary of the trusts, but under their terms, he has the right to acquire the property in the trusts, including the Kirby shares owned by the trusts, by substituting property of equal value.

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