KLA-Tencor ( KLAC) said late Monday that it will be unable to report its fourth-quarter and full-year profit numbers because of an ongoing investigation into its stock options grants.The company will report its top-line numbers, however, on July 27, as previously planned. Analysts polled by Thomson First Call peg the company's revenue at $573.9 million for the quarter and $2.06 billion for the year. According to KLA, an internal investigation "has reached a preliminary conclusion that the actual measurement dates for financial accounting purposes of certain stock option grants issued in prior years likely differ from the recorded grant dates of such awards." The investigation committee has not yet determined if any compensation charges or tax implications are relevant or if KLA will have to revise any previous financial statements. The company said it will delay filing its annual report until the investigation is completed. Shares of the San Jose, Calif.-based company, which makes process monitoring systems for the semiconductor industry, dropped 1.4%, or 56 cents to $39.24 in recent after-hours trading. KLA stock closed the regular session up 75 cents to $39.80.