Nvidia has led the S&P 500 ( ^GSPC -0.29%) higher this year amid frenetic interest in artificial intelligence (AI). The stock has surged 136% since January, and Wall Street analysts forecast median upside of 30% from the current share price of $115. But betting on a single AI stock is a bad strategy.

While Nvidia is considered the top player in the AI chip market, it utilizes TSMC's foundries for its chip manufacturing. Nvidia was TSMC's second-largest customer last year, accounting for 11% of the Taiwan-based foundry giant's revenue. This may lead investors to believe that TSMC's fortunes are dependent on Nvidia's.

A William Blair analyst cheers Nvidia’s moat and margins — while also weighing in positively on Broadcom and Arm shares.

Key Takeaways Nvidia shares have exploded this year, but William Blair analysts say there's still an upside opportunity.The firm believes Nvidia has a one- to two-year lead on its competitors in artificial intelligence.

NVIDIA Corp. (NASDAQ: NVDA) continues to be one of the most hotly debated technology stocks. Your decision to buy or sell NVDA stock may follow the principles you would use to make any decision. In this article,