X0202 4 2007-03-09 0 0000026537 ARGON ST, Inc. STST 0001305061 Sellier Victor F 12701 FAIR LAKES CIRCLE FAIRFAX VA 22033 1 1 1 0 Vice President Common Stock 2007-03-09 4 S 0 9503 D 1666614 D Common Stock 2007-03-12 4 S 0 12651 D 1653963 D Common Stock 928803 I Trust Average price $25.0148 per share Average price $25.0113 per share The sale was made pursuant to a 10b5-1 trading plan entered into by Mr. Sellier on December 29, 2006. Shares were disposed of in multiple transactions on March 9, 2007 as follows: 6700 shares@ $25.00 600 shares@ $25.01 100 shares@ $25.02 300 shares@ $25.03 802 shares@ $25.05 200 shares@ $25.07 701 shares@ $25.08 100 shares@ $25.13 Shares were disposed of in multiple transactions on March 12, 2007 as follows: 9521 shares@ $25.00 1754 shares@ $25.01 100 shares@ $25.02 100 shares@ $25.04 238 shares@ $25.05 200 shares@ $25.06 138 shares@ $25.08 200 shares@ $25.10 100 shares@ $25.15 100 shares@ $25.16 200 shares@ $25.17 /s/ Victor F. Sellier 2007-03-12