Rumble Inc. (RUM) stock plunged 5.45% in pre-market trading on Tuesday, following a sharp 81% surge in the previous session on Monday. The pre-market plunge comes as investors take some profits after Rumble's rally on news of a $775 million investment from cryptocurrency company Tether.

On Monday, Rumble shares soared after the video platform entered an agreement for a $775 million investment from Tether. Tether agreed to purchase around 103.3 million Rumble shares at $7.50 per share. Rumble stated that it anticipates using $250 million to support growth initiatives, with the remaining proceeds to fund a self-tender offer for up to 70 million class A common shares.

The investment from Tether, which owns the namesake stablecoin, provided a significant boost to Rumble, a conservative video content platform that went public in 2022 after merging with a special purpose acquisition company. However, profit-taking appears to be driving the pre-market decline on Tuesday as investors lock in gains from the stock's recent surge.