Last Wednesday, the day after the midterms, Microsoft jumped nearly 7% to a record close of $555.80. The next day the Nasdaq 100 had its worst day since 2020. When the AI trade was getting hammered, Microsoft was where people went to hide. This week it's going the other way. CoreWeave is up over 20% today, Oracle about 8% and the chip stocks about 6%. Microsoft is down about 2.5%, at around $520. That's two red days in a row while nearly everything else in tech bounces. There are a couple of things going on that we don't think many people have joined up. On Tuesday Anthropic launched a spreadsheet tool that does a lot of what Excel does, plus a whiteboard app. Office is one of Microsoft's biggest earners. And Microsoft is one of the big tech names putting money into Anthropic when it lists next week. So it's helping fund a company that's starting to go after its own customers. Then there's the money side. Anthropic is looking to raise around $90bn, counting what those tech backers are putting in. That cash has to come from somewhere. If you're a big fund that piled into Microsoft as the safe way to own AI, it's the easiest thing to trim to make room. If that's what's happening, Microsoft could keep lagging into the listing, even on good days for AI. Once the deal's done, that selling should stop and it could catch up quickly. And if Anthropic's tools start winning Office customers, it becomes a much bigger question than a few weeks of money moving around. We're not saying anything's wrong with Microsoft as a business. It still makes a fortune. We're just watching whether it's still the place people hide.