Exhibit 11 PIA MERCHANDISING SERVICES, INC. COMPUTATION OF EARNINGS PER SHARE - - -------------------------------------------------------------------------------- (IN THOUSANDS, EXCEPT PER SHARE DATA) Three Months Ended March 31, ---------------------------- 1996 1995 ---- ---- PRIMARY Net income $ 897 $ 703 ----- ----- ----- ----- Common and common equivalent shares outstanding: Weighted average shares of common stock 4,324 3,084 Options 497 175 Warrants 111 1,050 ----- ----- Common and common equivalent shares used in computing per share amounts 4,932 4,309 ----- ----- ----- ----- Net income per common and common equivalent share $ .18 $ .16 ----- ----- ----- ----- FULLY DILUTED Net income $ 897 $ 703 ----- ----- ----- ----- Common and common equivalent shares outstanding: Weighted average shares of common stock 4,324 3,084 Options 504 175 Warrants 112 1,050 ----- ----- Common and common equivalent shares used in computing per share amounts 4,940 4,309 ----- ----- ----- ----- Net income per common and common equivalent share $ .18 $ .16 ----- ----- ----- -----