A couple of days ago, UMC published its financial results and revealed that 14nm accounted for 1 percent of its sales in Q2 2017.
Revenue of 28nm products accounted for 17 percent of UMC's sales, the same as the quarter before, but the outlook for the next couple of quarters looks weaker. UMC is seeing 28nm competition from larger rivals as well as Chinese players like SMIC.
UMC also revealed it may not get into 10nm or 7nm as its opportunities there are lower:
The company said it may cede competition at the 10nm and 7nm nodes to larger rivals TSMC and Samsung, where UMC said there will be “less demand”. UMC said it will focus on addressable markets where there is still plenty of room to grow.As seen in the image below, the vast majority of UMC's revenue originates from processes of 40nm or larger.