X0303 4 2010-06-09 0 0000314606 GEOKINETICS INC GOK 0001008024 ZIEGLER WILLIAM R SATTERLEE STEPHENS BURKE & BURKE LLP 230 PARK AVENUE, 11TH FLOOR NEW YORK NY 10169 1 0 0 0 Common Stock 2010-06-09 4 P 0 20000 4.8123 A 518288 D Common Stock 2010-06-10 4 P 0 35200 4.969 A 553488 D Common Stock 2010-06-11 4 P 0 12500 5.0501 A 565988 D These shares were purchased on 6/9/2010 at prices ranging from $4.67 to $4.89. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. These shares were purchased on 6/10/201 at prices ranging from $4.89 to $5.00. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. These shares were purchased on 6/11/2010 at prices ranging from $4.97 to $5.11. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. /s/ William R. Ziegler 2009-06-11