Camarillo-based Semtech said today that it will restate its historical financial statements, as a result of stock-based compensation. The firm had reported earlier that it has been in an internal review of its stock option practices, after receiving an informal SEC inquiry into the firm. Semtech is one of the dozens of high tech companies being investigated in the SEC's wide-ranging investigation into back-dating of stock options. According to Semtech, its investigation committee has concluded that accounting measurement dates for certain stock options granted primarily during fiscal years 1998 through 2003 differ from the measurement dates previously used for such awards, resulting in restatement of its financial statements for fiscal 2002 through 2006. Semtech is currently facing possible delisting from the Nasdaq due to its inability to file a 10-Q for the fiscal quarter ending April 30th. Semtech also said today that it has been served with a third stockholder derivative lawsuit related to its stock options practices.