SAN JOSE, Calif., April 29, 2019 (GLOBE NEWSWIRE) -- Quantenna Communications, Inc. (NASDAQ:QTNA) today announced preliminary unaudited financial results for the first quarter ended March 31, 2019, with revenues of $57.7 million; GAAP net loss per share of $(0.03) and non-GAAP diluted earnings per share of $0.15. Financial Summary Three Months Ended March 31, 2019 April 1, 2018 Revenue $ 57,678 $ 45,117 Gross Profit 29,508 22,765 Gross Margin 51.2 % 50.5 % Net income (loss): GAAP $ (1,105 ) $...