 HUNTSVILLE, Ala.--BUSINESS WIRE--ADTRAN, Inc., NASDAQ:ADTN, today announced financial results for the first quarter of 2021. For the quarter, revenue was 127.5 million. Net income for the first quarter of 2021 was 0.9 million and earnings per share, assuming dilution, was 0.02 per share. Non-GAAP net income was 6.3 million and non-GAAP earnings per share, assuming dilution, was 0.13 per share. Non-GAAP net income and non-GAAP earnings per share exclude stock-based compensation expense, 