Discrepancies - Index Returns Data

Quick question for all you HF folks:

I'm currently analyzing fund returns vs indices and the current cumulative indices returns Nasdaq (^COMP) and S&P 500 (^SPX) are returning values lower than the fund has listed for their benchmark (>1.5% for the month of December and ~3% greater for CY20). Have checked both CIQ and BBG.

Am I missing something obvious here? Do funds use different data sets or methods for calculating these cumulatives? Small difference obviously but causes a pretty big delta between their reported and my calculated over the life of the fund.

Thanks for any input!

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Discrepancies - Index Returns Data

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