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Oct 1, 2025 4:00 PM

QuantumScape, Applovin Among Russell 1000's Top Q3 Winners

The Russell 1000 Index posted a strong overall performance in Q3, closing the quarter up around 7%. However, the average stock returned about 4% which indicates that the largest gains were driven by a handful of high-flying names. 

Here's a look at the outperforming stocks that led the index in quarterly gains. 

QS stock is climbing. See the real-time price action here. 

Top Gainers Over 100%

The Russell 1000 saw its best-performing stocks dominated by four standouts, which each gained over 100%. 

Sandisk Corp. (NASDAQ:SNDK) had an extraordinary 150% run in the third quarter of 2025. Sandisk is one of the five largest suppliers of NAND flash ...