KLA Corporation (NASDAQ:KLAC) stock tumbled Friday as investors digested earnings and guidance that landed near expectations but failed to impress.An analyst kept a neutral stance, pointing to valuation concerns and a near-term industry shift toward memory spending.Quarterly UpdateOn Thursday, the company reported second-quarter earnings of $8.85 per share, which beat the analyst consensus estimate of $8.80, according to data from Benzinga Pro.KLA expects third quarter adjusted EPS of $8.30 to $9.86, versus ...