Warren Buffett turned heads last week when he invested in a semiconductor stock for the first time, foundry giant Taiwan Semiconductor Manufacturing (NYSE: TSM).

While the Oracle of Omaha had lots of good reasons to invest in TSMC, there might actually be a greater opportunity in Taiwan Semi's key suppliers, like these three profitable semiconductor equipment stocks.

As Taiwan Semiconductor has a highly diverse set of powerful customers, so does Applied Materials (NASDAQ: AMAT). Applied Materials is the largest semiconductor equipment stock by revenue, and serves the advanced foundry/logic, trailing-edge foundry/logic, DRAM and NAND memory, advanced display, and advanced packaging markets.

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Source Fool.com