EX-99.A 2 h16973aexv99wa.txt TRANSACTIONS IN THE COMMON STOCK EXHIBIT A TRANSACTIONS IN THE COMMON STOCK BY PEBBLETON With respect to the transactions set forth below, all sales were made by Pebbleton Corporation N.V. and were effected on The Nasdaq Stock Market, Inc., the exchange on which the shares of Common Stock of Dawson Geophysical Company are traded, during the 60 days prior to the filing of this Amendment No. 10.
DATE OF NUMBER OF PRICE PER SALE SHARES SOLD SHARE($) 7/14/2004 2,000 22.62 7/14/2004 500 22.55 7/14/2004 500 22.51 7/14/2004 500 22.50 7/14/2004 500 22.39 7/14/2004 500 22.40 7/14/2004 500 22.32 7/14/2004 500 22.20 7/14/2004 500 22.11 7/14/2004 5,000 22.00 7/14/2004 1,000 22.05 ------ 12,000 7/15/2004 10,500 22.00 7/15/2004 1,000 22.09 7/15/2004 1,000 22.02 7/15/2004 3,000 22.03 7/15/2004 5,000 22.50 7/15/2004 3,000 22.31 7/15/2004 2,000 22.27 7/15/2004 2,500 22.25 7/15/2004 2,000 22.10 7/15/2004 4,000 22.20 ------ 34,000 07/16/2004 4,000 22.10 07/16/2004 1,000 22.07 07/16/2004 1,000 22.00 07/16/2004 1,000 22.01 07/16/2004 1,000 22.05 07/16/2004 2,000 22.12 07/16/2004 2,000 22.14
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DATE OF NUMBER OF PRICE PER SALE SHARES SOLD SHARE($) 07/16/2004 1,000 22.15 07/16/2004 1,000 22.13 07/16/2004 1,000 22.23 07/16/2004 2,000 22.20 07/16/2004 1,000 22.18 07/16/2004 2,000 22.25 07/16/2004 1,000 22.26 07/16/2004 1,000 22.17 07/16/2004 2,000 22.19 ------ 24,000 07/19/2004 15,000 22.00 07/19/2004 2,000 22.15 07/19/2004 5,000 22.14 07/19/2004 3,000 21.92 07/19/2004 3,000 21.90 07/19/2004 2,000 21.97 ------ 30,000 07/20/2004 14,000 22.00 07/20/2004 3,000 22.07 07/20/2004 3,000 22.10 07/20/2004 5,000 22.05 ------ 25,000 07/21/2004 1,000 22.00 ----- 1,000
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