Billionaire fund manager Bill Ackman reported Thursday that his company, Pershing Square Capital Management, has a 38% equity stake in Seaport Entertainment, owner of the Oakland A’s Triple-A affiliate and various real estate in Nevada and New York.Ohtani’s 50/50 HR Ball Will Run You $500,000–at Least Seaport Entertainment became a publicly traded business after being spun-off from Howard Hughes Corp. in August. Seaport, traded on the NYSE American, a small cap stock exchange, completed a fund raise Monday by selling seven million rights at $25 each to buy its stock. Each right can convert to about 1.27 shares of common stock….