The Committee to Strengthen J. Alexander's, the investor group calling for big changes at the Nashville-based restaurant chain, has filed its preliminary proxy outlining its platform. The document reiterates many of the things the managers of lead investor Privet Fund have said before, but it also details that Privet entities in the past week and a half snapped up more than 43,000 shares. Those purchases were their first since December. J. Alexander's shares (Ticker: JAX) are up more than 30 percent so far this year.