Applied Materials provides the equipment that AI chipmakers need.Artificial intelligence (AI) has been the primary driver of the current bull market.AI is the theme that connects the "Magnificent Seven" companies. And their tremendous growth -- combined with investors' seemingly insatiable demand for AI-related stocks -- over the past decade has put the market cap of each of the seven above $1 trillion. As a result, the seven tech giants now account for 37% of the S&P 500's market cap. But I would argue tha ...