EXHIBIT 11 MITCHAM INDUSTRIES, INC. COMPUTATION OF EARNINGS PER COMMON AND COMMON EQUIVALENT SHARE Three months ended April 30, ----------------------- 1996 1995 ---- ---- Computation of primary earnings per common share: Net income ............................................. $505,000 $376,000 --------- --------- Weighted average number of common shares outstanding ........................................... 3,435,006 3,170,000 Net effect of dilutive stock options and warrants, based on the treasury stock method, using average market price.. ........................................ 589,023 - --------- --------- Common shares outstanding .............................. 4,024,029 3,170,000 --------- --------- --------- --------- Earnings per common share .............................. $0.13 $0.12 --------- --------- --------- --------- Computation of earnings per common share assuming full dilution: Net income ............................................. $505,000 $376,000 --------- -------- Weighted average number of common shares outstanding ........................................... 3,435,006 3,170,000 Net effect of dilutive stock options and warrants based on the treasury stock method, using the end-of-period market price .......................................... 723,757 - --------- --------- Common shares outstanding assuming full dilution ....... 4,158,763 3,170,000 --------- --------- --------- --------- Earnings per common share assuming full dilution ....... $0.12 $0.12 --------- --------- --------- --------- 10