This strong performance comes after five months of falling sales and compares with May figures that were down 0.7 percent on a year before and April figures which were down 8.8 percent down.
June sales were $2.77 billion, up 21.9 percent from the same month a year before and up 6.8 percent from May. TSMC's revenue for first half of the year was $14.51 billion, down 4.5 percent on the first half of 2018.
TSMC provided no comment on what was responsible for the turnaround. An improvement in sales May to June in 2019 coincided with a steep drop in sales across the same months in 2018.
June sales at foundry United Microelectronics continued to fall, however, down both sequentially and year-on-year. June sales at UMC were down 12.4 percent on an annual basis, while revenues for the first six months of 2019 totalled $2.21 billion, a fall of over 10 percent with the same period in 2018.