https://www.cnbc.com/2019/01/09/att-shares-stumble-after-rivals-t-mobile-verizon-pick-up-new-subscribers.html

Shares of telecom giant AT&T stumbled Wednesday after rivals T-Mobile and Verizon crushed expectations for new subscribers.

Traders seem to be predicting a zero-sum game among the cable providers. Growth by competitors raises questions about whether AT&T can top expectations, too. AT&T's stock fell as much as 4 percent Wednesday, and was down about 2 percent as of noon ET. Shares are down 19 percent year over year.