EXHIBIT 11 AMERICAN TELESOURCE INTERNATIONAL INC. AND SUBSIDIARIES COMPUTATIONS OF LOSS PER SHARE (in thousands) For the Year Ended ------------------------------------------------- July 31, 1997 July 31, 1998 July 31, 1999 ------------------------------------------------- COMPUTATION OF BASIC LOSS PER SHARE Net loss ($4,695) ($5,094) ($7,591) ========== ========== ========== WEIGHED AVERAGE NUMBER OF SHARES COMMON STOCK OUTSTANDING 26,807 41,093 47,467 ========== ========== ========== BASIC LOSS PER COMMON SHARE ($0.18) ($0.12) ($0.16) ========== ========== ========== COMPUTATION OF DILUTED LOSS PER SHARE Net loss ($4,695) ($5,094) ($7,591) Dividends not incurred upon assumed conversion of convertible preferred stock 0 0 70 Interest not incurred assumed conversion of convertible note 9 0 0 ---------- ---------- ---------- Not loss applicable to common stockholders used for computation ($4,686) ($5,094) ($7,521) ========== ========== ========== Weighted average number of shares of common stock outstanding 26,807 41,093 47,467 Weighted average incremental shares outstanding upon assumed conversion of options and warrants 3,061 10,228 4,272 Weighted average incremental shares outstanding upon assumed conversion of preferred stock 0 0 264 Weighted average incremental shares outstanding upon assumed conversion of convertible note 200 0 0 ---------- ---------- ---------- WEIGHT AVERAGE COMMON SHARES AND COMMON SHAE EQUIVALENTS USED FOR COMPUTATION 30,068 51,321 52,003 ========== ========== ========== DILUTED LOSS PER COMMON SHARE AND COMMON EQUIVALENT ($0.16) ($0.10) ($0.14) ========== ========== ==========