Here is a brief explanation from Google.

XBI is an equal-weight ETF, whereas IBB is cap weighted. That gives XBI a potential performance advantage when smaller biotech stocks are surging, but it also makes the ETF more volatile than its cap-weighted peer. XBI's three-year annualized volatility is nearly 800 basis points higher than that of IBB.

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• Thank you!! -gossipgirl8- ♀ (0 bytes) () 04/21/2020 postreply 12:10:52