EXHIBIT 11.1 STATE STREET BOSTON CORPORATION COMPUTATION OF EARNINGS PER SHARE YEAR ENDED DECEMBER 31 ---------------------------------- 1994 1993 1992 ---------- ---------- ---------- (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA) Primary: Average shares outstanding ............. 76,325,138 75,443,604 74,761,232 Common stock equivalents ............... 525,577 749,560 1,474,069 ---------- ---------- ---------- Primary shares outstanding ........... 76,850,715 76,193,164 76,235,301 ---------- ---------- ---------- ---------- ---------- ---------- Net income ........................... $ 207,413 $ 179,829 $ 160,443 ---------- ---------- ---------- ---------- ---------- ---------- Earnings Per Share -- primary ........ $ 2.70 $ 2.36 $ 2.10 ---------- ---------- ---------- ---------- ---------- ---------- Fully diluted: Average shares outstanding ............. 76,325,138 75,443,604 74,761,232 Common stock equivalent ................ 525,577 749,560 1,738,055 Assumed conversion of 5% convertible notes .................................... 4,909 41,259 41,323 Assumed conversion of 5% convertible subordinated debentures .................. 626,119 942,079 1,157,163 ---------- ---------- ---------- Fully diluted average shares outstanding .............................. 77,481,743 77,176,502 77,697,773 ========== ========== ========== Net income ............................. $ 207,413 $ 179,829 $ 160,443 Elimination of interest on 5% convertible notes and 7 3/4% convertible subordinated debentures less related income tax benefit ................... 155 214 296 ---------- ---------- ---------- Fully diluted net income ............. $ 207,568 $ 180,043 $ 160,739 ========== ========== ========== Earnings Per Share -- fully diluted ...... $ 2.68 $ 2.33 $ 2.07 ========== ========== ==========