Group 1 - The top performer in the S&P 500 Index for the year is SanDisk Corp (NASDAQ:SNDK), which began trading in early February and joined the index in late November [2] - SNDK has experienced a remarkable increase of 268.2% over the last nine months, with shares rising from an initial trading price of $36 to a record high of $284.59 on November 12 [3] - Despite the strong performance, short interest in SNDK has increased by 22.8% in the last two reporting periods, indicating potential concerns over AI overvaluation and suggesting the possibility of a short squeeze in 2026 [5] Group 2 - SanDisk is a spinoff of Western Digital (WDC), which ranks as the second-best performer in the S&P 500 Index [2] - The stock has shown resilience against volatility, reflected in its Schaeffer's Volatility Scorecard (SVS) rating of 89 out of 100 [5]
This Tech Stock Takes the S&P 500 Top Spot in 2025