Just read Berkshire Hathaway's latest financial report and there's something that caught my attention. Warren Buffett basically just sent a massive signal to the market with his feet, not his words. The numbers tell a story most people are glossing over.

So here's what happened: Berkshire has been dumping stocks for 13 straight quarters now. We're talking $187 billion in net sales. And this isn't because the company ran out of ideas—they've got over $300 billion sitting in cash. The real issue? Warren Buffett and his team literally cannot find stocks worth buying at current prices. That's the warning right there.

I've been watching the S&P 500's valuations, and they're genuinely stretched. The CAPE ratio hit 39.8 back in February. For context, you have to go all the way back to the dot-com crash in 2000 to see numbers this high. We're talking about a level that's only appeared in 26 months over the past 70 years.

Here's where it gets interesting. Historically, whenever the S&P 500 hits a CAPE above 39, the returns get ugly. The data shows an average 4% drop over 6 months, 20% over 2 years, and 30% over 3 years. If that pattern holds, we could see some serious corrections coming.

Now, I'm not saying the sky is falling. AI could change everything—earnings might grow faster than we expect, which would justify current valuations. But Warren Buffett's actions suggest he's not betting on that scenario right now. His strategy is basically: sit tight until things make sense again.

The takeaway for me is straightforward. If you're thinking about adding to your portfolio, be selective. Only grab stocks where the valuation actually makes sense and where you genuinely believe earnings will be significantly higher in five years. Anything else is just gambling on momentum, and that's not a game I want to play when someone like Buffett is sitting on the sidelines.