[MULTIPLIER] 1,000 Part II. Other information, Item 6a. Exhibit 11.1 EXHIBIT 11.1 HMT TECHNOLOGY CORPORATION STATEMENT REGARDING COMPUTATION OF NET INCOME PER SHARE (in thousands, except per share data) (Unaudited) Three Months Ended June 30, ------------------- 1998 1997 --------- --------- Basic: Weighted average shares outstanding for the period ...................... 43,415 41,135 --------- --------- Shares used in computing per share amounts ....................... 43,415 41,135 ========= ========= Net income available for common stockholders ........................ 1,092 15,369 ========= ========= Net income available for common stockholders per share .............. $0.03 $0.37 ========= ========= Diluted(1): Weighted average shares outstanding for the period ...................... 43,415 41,135 Net effect of dilutive stock options based on the treasury stock method using average market price .......... -- 2,989 Assumed conversion of 5 3/4% convertible subordinated notes ...... -- 9,684 --------- --------- Shares used in computing per share amounts ............................. 43,415 53,808 ========= ========= Net income available for common stockholders ........................ 1,092 15,369 Add 5 3/4% convertible subordinated note interest, net of interest capitalized and income tax effect ... -- 1,389 --------- --------- Net income available for common stockholders ........................ $1,092 $16,758 ========= ========= Net income available for common stockholders per share .............. $0.03 $0.31 ========= ========= (1) Diluted EPS for the three months ended June 30, 1998 does not assume conversion of the Company's 5 3/4% convertible subordinated notes, as the effect would be anti-dilutive.