shares of cable companies fell on tuesday extending a recent downtrend that has taken major names to multimonth lows as concerns over subscriber growth have prompted analysts to sour on the industry tuesday’s weakness came after deutsche bank downgraded both altice usa inc and charter communications inc this is at least the third downgrade charter has received over the past week and the fourth for altice in less than a month ever since it cut its forecast for broadband subscribers a move that came after a similar warning from comcast corp in midseptember