EXHIBIT 11 PERIPHONICS CORPORATION COMPUTATION OF EARNINGS PER COMMON SHARE (In thousands, except per share data) Year Ended May 31, 1997 1996 1995 ----- ----- ---- NET EARNINGS: $ 12,637 $ 9,215 $ 3,184 ========= ======== ========= COMPUTATION OF ADJUSTED WEIGHTED AVERAGE SHARES OUTSTANDING: Weighted average shares outstanding 13,641 12,890 8,270 Add: Shares assumed to be issued upon conversion of Series A preferred stock - - 1,246 Add: Shares assumed to be issued upon conversion of preferred stock issued by subsidiary through exercise of a warrant - 78 78 Add: Effect of stock options outstanding 364 292 184 --------- -------- --------- Weighted average shares and common equivalent shares used for primary earnings per common share computation 14,005 13,260 9,778 Add: Effect of additional stock options outstanding for fully diluted computation - 88 - --------- -------- --------- Weighted average shares and common equivalent shares used for fully diluted earnings per common share computation 14,005 13,348 9,778 ========= ======== ========= EARNINGS PER COMMON AND COMMON EQUIVALENT SHARE: PRIMARY: $ 0.90 $ 0.69 $ 0.33 ========= ======== ========= FULLY DILUTED: $ 0.90 $ 0.69 $ 0.33 ========= ======== =========