SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report: March 21, 2006

Date of Earliest Event Reported: March 20, 2006

NATIONAL MERCANTILE BANCORP

(Exact Name of Registrant as Specified in its Charter)

California

(State or Other Jurisdiction of Incorporation)

0-15982		95-3819685
(Commission File Number)		(I.R.S. Employer Identification No.)

1880 Century Park East, Los Angeles, California		90067
(Address of Principal Executive Offices)		(Zip Code)

(310) 277-2265
(Registrant’s Telephone Number, Including Area Code)

n/a
(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425).

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12).

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)).

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)).

Item 8.01 Other Events

On March 20, 2006, National Mercantile Bancorp issued a press release announcing the declaration of a five-for-four stock split in the form of 25% stock dividend. A copy of the press release is attached to this Form 8-K as Exhibit 99.1 and incorporated herein by reference.

The information in this Form 8-K is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that Section. The information in this Form 8-K may only be incorporated by reference in another filing under the Securities Exchange Act of 1934 or Securities Act of 1933 if such subsequent filing specifically references this Form 8-K.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits.

Exhibit No.		Description
99.1		Press Release dated March 20, 2006

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

			NATIONAL MERCANTILE BANCORP


Dated: March 20, 2006	By:	/s/ David R. Brown

				David R Brown
				Chief Financial Officer

EXHIBIT INDEX

Exhibit No.		Description
99.1		Press Release dated March 20, 2006

NATIONAL MERCANTILE BANCORP 8-K