AT&T, Verizon and Comcast stocks just had their worst quarter in two decades

Some of the biggest telecommunications stocks just posted their steepest quarterly declines in two decades amid pressures both new and old on the cable and wireless industries.

Shares of wireless companies AT&T Inc.

and Verizon Communications Inc.

lost 26.8% and 25.2%, respectively, during the third quarter. Those were the largest quarterly percentage declines since September 2002 for both companies,…

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