What's been the best way to grow a stock portfolio in 2023? Halfway through the year, the answer is clear -- own some artificial intelligence (AI) stocks.

Nvidia (NASDAQ: NVDA), for example, is up a staggering 211% year to date. With those sorts of eye-popping returns, many investors want to know: Is it now too late to buy AI stocks?

So, let's have a look at one green flag and one red flag for the hottest sector in the stock market.

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Source Fool.com