Cantor Fitzgerald LP’s Shawn Matthews is stepping down as head of the firm’s broker-dealer unit and plans to start a hedge fund. Matthews, 51, spent nine years atop the division, Cantor Fitzgerald & Co., working to wrest talent and market share from larger investment banks that retrenched after the 2008 financial crisis. He’s launching a macro fund called Hondius Capital, looking to capitalize on a new era of market turmoil, Cantor Chief Executive Officer Howard Lutnick announced in an internal memo.