From the ACX 2025 Prediction Contest:

I will resolve this based on the Metaculus resolution:
This question resolves as Yes if Nvidia's stock outperforms the S&P 500 in 2025. If its return is less than or equal to that of the S&P 500, this question resolves as No.

The resolution sources are: 

• The Yahoo Finance history page for NVIDIA Corporation (NVDA).

• The Yahoo Finance history for the SPDR S&P 500 ETF Trust (SPY).