 TEMPE, Ariz.--BUSINESS WIRE--Amkor Technology, Inc. NASDAQ: AMKR, a leading provider of semiconductor packaging and test services, today announced financial results for the first quarter ended March 31, 2021. Amkor delivered a first quarter revenue record of 1.33 billion, a 15 increase over the first quarter of last year, said Giel Rutten, Amkors president and chief executive officer. Continued strength in Advanced packaging and year-on-year growth of 13 in our Mainstream business le 