No. If you have made a valid mark-to-market election under section 475(f), the only way to stop using mark-to-market accounting for securities is to request and receive written permission from the IRSe to revoke the election. Non-filing of the Form 3115 mentioned above will not invalidate a timely and valid election. To request permission to revoke your election under section 475(f), you must file a second Form 3115.