Website to find out stock exposure ?

I am curious how much actual exposure I have to individual stocks in my portfolio, is there a website or tool to help with that?

For example, if my portfolio is 50% VTI, 25% AAPL, and 25% AMZN how much exposure do I have to AAPL and AMZN considering AAPL and AMZN is in VTI?

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