Opendoor Technologies, Inc. OPEN shares jumped in Wednesday’s extended trading session after Jane Street disclosed a stake in the company. OPEN stock is trading higher. See the real-time price action here. Jane Street Joins the OPEN ArmyJane Street Group disclosed in a 13G filing that it collectively holds 44,031,310.18 shares, which represent 5.9% of Opendoor's total outstanding common stock.Read Next: Rigetti, D-Wave, IonQ Set To Disrupt Everything—Expert Goes All InSchedule 13G is a filing required by th ...