AT&T Inc.'s stock plummeted nearly 10% on Thursday after the mobile carrier's first-quarter revenue fell short of expectations. Comparing the corresponding quarter to the same period a year ago, the company's diluted earnings per share dropped by 12.3% to $0.57 per share.
The telecom giant's shares were down 9.99% trading at $17.73 per share at 12:05 pm ET.