Blackbaud CEO Marc Chardon is cleaning out his share holdings in the maker of not-for-profit software. He sold 307,463 shares of the Charleston, S.C.-based company this month for an aggregate of $10.7 million, which he purchased by the exercise of options of $7.6 million. Chardon is leaving the company as soon as a replacement can be found and sold another large block of shares, 148,974, in May after the exercise of options.