1 EXHIBIT 11.1 HMT TECHNOLOGY CORPORATION STATEMENT REGARDING COMPUTATION OF NET INCOME PER SHARE (1) (In thousands, except per share data) QUARTER ENDED SIX MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, ------------------- ------------------- 1997 1996 1997 1996 ------- ------- ------- ------- (Unaudited) (Unaudited) Primary: Weighted average shares outstanding for the period .................................... 41,832 40,399 41,484 40,182 Net effect of dilutive stock options-based on the treasury stock method using average market price... 2,964 3,806 2,975 3,928 ------- ------- ------- ------- Shares used in computing per share amounts........... 44,796 44,205 44,459 44,110 ======= ======= ======= ======= Net income available for common stockholders ........ $19,064 $16,605 $34,433 $32,500 ======= ======= ======= ======= Net income available for common stockholders per share ......................................... $ 0.43 $ 0.38 $ 0.77 $ 0.74 ======= ======= ======= ======= Fully Diluted: Weighted average shares outstanding for the period... 41,832 40,399 41,484 40,182 Net effect of dilutive stock options-based on the treasury stock method using average market price... 3,021 3,806 3,004 3,928 Assumed conversion of 53/4% convertible subordinated notes ............................................. 9,684 -- 9,684 -- Shares used in computing per share amounts .......... 54,538 44,205 54,172 44,110 Net income available for common stockholders ........ $19,064 $16,605 $34,433 $32,500 ------- ------- ------- ------- Add 5 3/4% convertible subordinated note interest, net of interest capitalized and income tax effect ............................................ 1,541 -- 2,876 -- ======= ======= ======= ======= Net income available for common stockholders ........ $20,705 $16,605 $37,309 $32,500 Net income available for common stockholders per share ......................................... $ 0.38 $ 0.38 $ 0.69 $ 0.74 ======= ======= ======= =======