A Counterpoints Research study has determined that TSMC has 28% of the market share in matured nodes (40nm and below), making it the world leader in the global semiconductor manufacturing market. UMC, SMIC and Samsung take second, third and fourth place with market shares of 13%, 11% and 10%, respectively.
https://www.notebookcheck.net/TSMC-has-the-largest-market-share-in-the-global-semiconductor-manufacturing-industry-Counterpoints-Research.518137.0.html