Nvidia (NVDA) upping its share buyback plan, paired with the announcement of a new open agent safety platform, gave a boost to shares. The launch of SpaceX's (SPCX) Starship into orbit wasn't enough to excite investors, though the price action wasn't as stark as that in Boeing (BA). MongoDB (MDB) shares plunged after its CEO announced he was leaving for Meta Platforms (META). Marley Kayden discusses the top stories moving markets on Monday.