Charles Schwab's Joe Mazzola is back on the Watch List to talk about the firm's STAX report for January. He notes a "buy the dip" mentality that persisted in Big Tech, with investors scooping up shares in Microsoft (MSFT) post-earnings. Nvidia (NVDA), Tesla (TSLA), and Netflix (NFLX) were among other top buys. Joe does note a theme of "selling into strength" for January with top sells including AMD Inc. (AMD), Boeing (BA), and Costco (COST).