For some unknown reason (I suppose focus) I have the most success day trading one stock or etf or at least one industry group. When I trade a watchlist of even 10 stocks in different groups I find myself chasing and missing. I'm wondering if others trade one stock or etf only and why? I find myself "wanting" to trade more stocks in different groups but I seem to only hurt my overall P/L with most of the gains coming from that one group or stock.