NVDA attribution for SPY | Voters

NVDA attribution for SPY

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Adorable Ostrich

SPY holdings NVDA is 5.77% weight which is same as SPY website. Return YTD is 112%. When I multiply those two I should get attribution which is 646 bps in this case. The SPY holdings page on Koyfin states its in the mid 300s. What am I doing wrong?

August 9, 2024

Conor MacNeil

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Conor MacNeil

Hey Jerry, apologies for the delay here. Not sure how I missed this question. 
For a stock, we calculate the attribution by multiplying the estimated weight at the beginning of the period with the performance during the period. The reason we have to estimate the weight is that we don't have constituents going back in history. We only have the current constituents.
Here is more information on the methodology on this page: https://www.koyfin.com/help/etf-holdings-constituents-and-contribution/

Indigo Trout

NVDA might be 5.77% of SPY today but it didn't start the year at that weighting: