1 EXHIBIT 11.1 LAM RESEARCH CORPORATION STATEMENT RE: COMPUTATION OF EARNINGS (LOSS) PER SHARE (Unaudited) Three Months Ended (In thousands except per share data) ----------------------------------------------- September 30, September 30, 1997 1996 ---------------------- ------------------- Fully Fully Primary Diluted Primary Diluted -------- -------- ------- ------- Net income (loss) $(12,172) $(12,172) $11,748 $11,748 -------- -------- ------- ------- $(12,172) $(12,172) $11,748 $11,748 ======== ======== ======= ======= Average shares outstanding 37,600 37,600 36,525 36,525 Net effect of dilutive stock options 856 856 -------- -------- ------- ------- 37,600 37,600 37,381 37,381 -------- -------- ------- ------- Net income (loss) per share $ (0.32) $ (0.32) $ 0.31 $ 0.31 ======== ======== ======= ======= Amounts presented above applicable to prior periods have been restated to reflect the Company's merger with OnTrak accounted for as a pooling of interests.