Argon St (STST) DEFA14A Additional proxy soliciting materials

SCHEDULE 14A

(RULE 14a-101)
INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934

Filed by the Registrantþ
Filed by a Party other than the Registranto

Check the appropriate box:

o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

þ Definitive Additional Materials

o Soliciting Material Pursuant to Rule 14a-11c or Rule 14a-12

ARGON ST, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement)

Payment of Filing Fee (Check the appropriate box):

þ No fee required.

o Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)	Title of each class of securities to which transaction applies:
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(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
(4)	Proposed maximum aggregate value of transaction:
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o Fee paid previously with preliminary materials.

o Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1)	Amount Previously Paid:
(2)	Form, Schedule or Registration Statement No.:
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(4)	Date Filed:

ARGON ST, INC.

** IMPORTANT NOTICE **

Regarding the Availability of Proxy Materials

You are receiving this communication because you hold shares in the above company, and the materials you should review before you cast your vote are now available.

This is not a ballot. You cannot use this notice to vote your shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting.

ARGON ST, INC.
12701 FAIR LAKES CIRCLE, SUITE 800
FAIRFAX, VIRGINIA 22033

Stockholder Meeting to be held on February 23, 2010

Proxy Materials Available

• Notice and Proxy Statement

• Annual Report

PROXY MATERIALS — VIEW OR RECEIVE

You can choose to view the materials online or receive a paper or e-mail copy. There is NO charge for requesting a copy. Requests, instructions and other inquiries will NOT be forwarded to your investment advisor.

To facilitate timely delivery please make the request as instructed below on or before February 10, 2010.

HOW TO VIEW MATERIALS VIA THE INTERNET

Have the 12 Digit Control Number(s) (located on the following page) available and visit: www.proxyvote.com

HOW TO REQUEST A COPY OF MATERIALS

1)	BY INTERNET — [www.proxyvote.com]
2)	BY TELEPHONE — [1-800-579-1639]
3)	BY E-MAIL* — [sendmaterial@proxyvote.com]

* If requesting materials by e-mail, please send a blank e-mail with the 12 Digit Control Number (located on the following page) in the subject line.

See the Reverse Side for Meeting Information and Instructions on How to Vote

Meeting Information

Meeting Type:	Annual
Meeting Date:	Tuesday, February 23rd, 2010
Meeting Time:	10:00 a.m. EST
For holders as of:	Monday, January 4th, 2010

Meeting Location:

Argon ST, Inc. Headquarters

Argon ST, Inc.
12701 Fair Lakes Circle, Suite 800
Fairfax, Virginia 22033

Meeting Directions:

For Meeting Directions Please Call:
(703) 322-0881

How To Vote

Vote By Internet

To votenowby Internet, go toWWW.PROXYVOTE.COM.You can vote by accessing the Internet at www.proxyvote.com up until 11:59 P.M. Eastern Time the day before the cut-off date or meeting date. Have your notice in hand when you access the web site and follow the instructions.

Vote In Person

Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the Meeting you will need to request a ballot to vote these shares.

Voting items

THE BOARD RECOMMENDS THAT THE STOCKHOLDERS VOTE “FOR” ALL ELEVEN OF THE NOMINEES FOR DIRECTOR AND “FOR” PROPOSAL 2.

1.	Election of Directors
	Nominees:

01)   Terry L. Collins

02)   S. Kent Rockwell

03)   John Irvin

04)   Victor F. Sellier

05)   Thomas E. Murdock

06)   Lloyd A. Semple

07)   Peter A. Marino

08)   David C. Karlgaard

09)   Robert McCashin

10)   Maureen Baginski

11)   Delores M. Etter

2.	To ratify the Audit Committee’s selection of Grant Thornton LLP as the Company’s independent registered public accounting firm for the fiscal year ending September 30, 2010.
3.	Transact such other business as may properly come before the meeting.