Rumble stock surged Monday after the video streaming platform said it would receive a $775 million investment from cryptocurrency company Tether. The stock jumped 91% to $3.75, putting Rumble on track for its highest close since June 12, 2023, and marking the largest same-day percentage increase on record, according to Dow Jones Market Data. The company announced that Tether had agreed to purchase about 103.3 million shares at $7.50 a share.