Updated from 4:40 p.m. EDTSAN FRANCISCO -- Lam Research ( LRCX) posted healthy sales growth in its fiscal first quarter, beating Wall Street expectations. But the chipmaking equipment company was mum about its bottom line, owing to a continuing investigation into past stock options. Revenue in the three months ended Sept. 23 totaled $684.6 million, up 13% year over year, and ahead of the $675.8 million expected by analysts. The company credited the growth to market-share gains. "We have enjoyed significant success in enhancing our market position at the leading edge, winning a number of new applications and executing to our customers' most critical challenges," said CEO Steve Newberry in a statement. Analysts were looking for Lam to earn $1.27 in EPS, although Lam didn't provide a figure because of its previously announced internal accounting probe involving stock option grants. The company provided a preliminary operating income of $197.9 million, up about 1.6% from this time last year. Lam also said its gross margin was 50.2% vs. 51.8% at this time a year ago. Shares of Lam were up 32 cents in recent after-hours trading to $55.33. Lam is the first chip equipment maker to provide financial results for the recently ended quarter, and its results come on the heels of a spate of negative news for the chip equipment industry.