Richard Martial owns shares AND options. In fact he is one of the few who have real shares. You can email him and confirm. It is also part of public record so if he is lying....jail.
Oppenheimer's situation was also reported and it coincided also with tax deadline. According to Richard Marshall he informed the company of his need to sell back in December 2007 which I understand is also part of public record.
Insiders cannot trade on information that is denied to the public. I would imagine that the SEC checked into Oppenheimer or will as with RM, but I believe RM sold 8000 +/- out of some 200,000 he owns. I don't have the records in front of me but I encourage you to check the filings and contact RM directly.
Your assertion that RM and Oppenheimer sold because they knew what was going to happen is inaccurate.