EXHIBIT 11 TELLABS, INC. COMPUTATION OF EARNINGS PER SHARE (Unaudited) (In thousands, except per share data) Three Months Ended March 29, March 31, 1996 1995 --------- --------- PRIMARY EARNINGS PER SHARE * - ------------------------------------ Weighted average number of common shares outstanding during the period 88,858 87,532 Net additional shares assuming dilutive stock options exercised and proceeds used to purchase treasury shares at average fair market value 3,083 3,682 --------- --------- Weighted average number of common shares and common equivalent shares outstanding 91,941 91,214 ========= ========= Net earnings $31,127 $22,941 ========= ========= Primary earnings per share $0.34 $0.25 ========= ========= FULLY DILUTED EARNINGS PER SHARE * - ------------------------------------ Weighted average number of common shares outstanding during the period 88,858 87,532 Net additional shares assuming dilutive stock options exercised and proceeds used to purchase treasury shares at fair market value 3,162 3,770 --------- --------- Weighted average number of common shares and common equivalent shares outstanding 92,020 91,302 ========= ========= Net earnings $31,127 $22,941 ========= ========= Fully diluted earnings per share $0.34 $0.25 ========= ========= * 1995 share amounts are restated to give effect to the two-for-one stock split effective May 19, 1995.