Xponance Inc. boosted its stake in shares of United Airlines Holdings, Inc. (NASDAQ:UAL – Get Rating) by 2.2% in the 1st quarter, according to the company in its most recent Form 13F filing with the Securities and Exchange Commission (SEC). The firm owned 20,635 shares of the transportation company’s stock after buying an additional 436 shares during the quarter. Xponance Inc.’s holdings in United Airlines were worth $957,000 as of its most recent SEC filing….