Comcast falls; KeyBanc downgrades on broadband, theme park concerns
** Shares of media and telecommunications company Comcast CMCSA.O fall 1.4% to $21.82 premarket
** KeyBanc cuts rating to "underweight" from "sector weight"
** Brokerage sets PT of $18, implying 18.7% downside to the stock's last close
** KeyBanc cites increasing broadband competition and pressure on subscriber additions
** Brokerage expects theme parks to remain under pressure from soft Orlando attendance and weaker visitation in Osaka
** Average rating of 30 analysts is "hold"; median PT is $29 - data compiled by LSEG
** Stock down about 21% YTD, as of last close