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How can I find out which ETFs has holdings in a particular stock?
An ETF does not track any one individual stock. It "is a marketable security that tracks an index, a commodity, bonds, or a basket of assets like an index fund." Check out this link to learn more about ETFs. The easiest way see what ETF tracks a stock is to determine what sector and industry that company is in and find some ETF that trade it. The ETF will likely trade that stock, assuming that its market cap and exchange it trades on fits within the parameters of the ETF.