Shares of NVIDIA remain in a long-term bullish trend with a target price of $150. Shares of Costco ( COST) are at the top of the most-watched list today as the stock dropped almost 2% the day before the company’s earnings report.

One of the highest-flying stocks at that time was Nvidia which has continued to soar since that column was published —gaining about 40%, according to FactSet data. In contrast, Super Micro Computer whose trailing two-year return as of my mid-April column was even better than Nvidia’s,

Some investors have been concerned about the ongoing liquidation of Nvidia shares by the company's CEO. However, there are plenty of reasons to sell stock, particularly if stock options make up a large part of an executive's compensation package.

Investors have found another major way to play the artificial-intelligence trend besides semiconductor stocks, and that’s led to a changing of the guard atop this year’s list of the best S&P 500 performers.

This company is "a unique play in Europe on the Nvidia/AI supply chain," Jefferies investment bank said in a research note.