Linear Technology Inc. said Tuesday that the Securities and Exchange Commission's investigation concerning the integrated circuit maker's historical stock option grant practices is completed and no enforcement action will be taken. Linear Technology previously disclosed that it had reviewed its historical option-granting practices for 1995 through 2006, with the assistance of outside counsel and an independent accounting firm. The company found no evidence of fraud or misconduct, and concluded that there was no need to restate any previously filed financial statements. None of the company's SEC filings were delayed due to the review, Linear said.