Should You Buy Stocks at a Record High? Here's What Warren Buffett Is Doing.

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The S&P 500 index has soared, confirming its presence in a bull market early this year and going on to reach new records multiple times. The benchmark today is heading for a 22% annual gain, led by investors' optimism about a lower interest rate environment and excitement about the hot growth area of artificial intelligence (AI). Tech players involved in this fast-growing field have skyrocketed, and many still may have much more room to run over the long term.

All of this sounds great, but it's left many stocks trading at record highs -- and certain valuations looking pretty expensive. This may prompt you to wonder if you really should buy stocks today at a record high. And it's at times like these that it's a good idea to turn to investing expert and billionaire Warren Buffett for some wisdom.

Buffett, as chairman of Berkshire Hathaway, has guided the portfolio to a compounded annual gain of nearly 20% over 58 years -- well surpassing the 10% compounded annual increase of the S&P 500. So, Buffett has been through many different market phases and has come out a winner over time.

Let's check out what Buffett has done recently as the stock market rocketed higher -- and see if there are some moves we should follow.

Warren Buffett is shown at an event.
Image source: The Motley Fool.

A soaring Shiller CAPE ratio

First, a quick look at what I mean by stocks looking expensive. The S&P 500 Shiller CAPE ratio, a valuation measure considering earnings over 10 years adjusted for various economic cycles, has advanced in recent months. And right now is only the third time it's reached beyond the level of 35 since the S&P 500's debut in the late 1950s.

S&P 500 Shiller CAPE Ratio Chart
S&P 500 Shiller CAPE Ratio Chart

Now let's turn to Buffett. The billionaire investor has been more of a seller than a buyer of stocks in recent times. For example, in the second quarter, he and his team at Berkshire Hathaway sold shares of nine different companies -- including one of his favorite stocks, Apple (NASDAQ: AAPL). (And even more recently, Buffett and the team have been selling shares of another favored company, Bank of America.)

But it's important to put this into context. The billionaire also bought two new stocks in the second quarter (Ulta Beauty and Heico), added to a few long-held positions such as Occidental Petroleum, and held steady on more than 20 other positions.

We don't know the exact reasons for each individual buy and sell, but we do have some clues. First, let's consider the sales, most particularly Apple. Buffett suggested at the Berkshire Hathaway shareholder meeting back in May that sales of a position such as Apple are linked to his interest in locking in some profits under the current capital gains tax rate -- Buffett said he expected this rate to increase.