 Shares of Waitr Holdings Inc. WTRH, 45.66 shot up 45.4 on massive volume in afternoon trading Wednesday, to bounce off a 19-month closing low in the previous session, after Morgan Stanley disclosed a 10.3 stake in the company. Trading volume ballooned to 155.9 million shares, enough to make the online ordering technology platform companys stock the most actively traded on major U.S. exchanges, and well above the full-day average of about 4.9 million shares. 