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Palantir (PLTR) has dominated headlines with its 143% surge in 2025, but another S&P 500 ($SPX) stock has quietly claimed the title of top performer. Seagate Technology (STX) has rallied an astounding 196% year-to-date (YTD), outpacing even the AI software giant, which is tied to explosive demand for data storage driven by the buildout of artificial intelligence (AI) infrastructure.
The hard disk drive manufacturer is riding a powerful wave that few investors saw coming. As tech giants invest hundreds of billions in AI data centers, they require massive data storage capacity to train large language models (LLMs).