Sandisk (SNDK 2.50%) stock continues its epic run, defying all expectations. Shares of the artificial intelligence (AI) infrastructure company are up 726% this year, making Sandisk the best-performing stock in the Nasdaq-100.

But that performance is also bringing out some skeptics. Polymarket, which runs a popular prediction markets platform, announced in a social media post that Sandisk is “officially the most overbought stock in history.”

The platform cited Sandisk’s relative strength index (RSI), a technical stock analysis tool that measures the speed and magnitude of price changes to indicate whether a stock is overvalued or undervalued. RSI operates on a scale of 1 to 100. Readings over 70 are considered overbought and…