In a filing with the Securities and Exchange Commission earlier this week (hat tip, Patrick), Impac Mortgage Holdings disclosed that company COO Richard Johnson sold all of his preferred stock holdings on August 28 and October 1, right before the company posted its August 2007 monthly fact sheet. Johnson sold 71,100 shares of Impac's Series B and Series C preferred stock at prices between $10.75 and $11.07 per share, leaving him holding no remaining preferred shares.