1934 Act Registration No. 1-14700

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  x            Form 40-F  o

Indicate by check mark if the registrant is submitting the Form 6-K in papers as permitted by Regulation S-T Rule 101(b)(1):o

Indicate by check mark if the registrant is submitting the Form 6-K in papers as permitted by Regulation S-T Rule 101(b)(7):o Taiwan experienced a number of earthquakes on April 3, reaching as high as magnitude level 7.2 (the largest in Taiwan over the past 25 years).

The maximum magnitude at the Hsinchu, Longtan, and Zhunan science parks was 5, and reached magnitude 4 at the Taichung and Tainan science parks.

Safety systems at TSMC’s Taiwan fabs operated normally. Preventative measures to ensure employee safety and wellbeing were initiated at that time according to procedure, and some fabs were evacuated. All personnel are safe and returned to their workplace shortly after the incident. The company is currently evaluating the impact.

Initial inspections show that our construction sites are normal. However, the Company suspended work at construction sites for April 3, and work has resumed today (April 4) after further inspections.

Based on TSMC’s ample experience and capabilities in earthquake response and damage prevention, as well as regular disaster drills to ensure full readiness, overall tool recovery of our fabs reached more than 70% within 10 hours of the earthquake, with new fabs such as the Fab 18 facility reaching more than 80%. As of April 4, overall tool recovery of our fabs reached more than 80%, with new fabs such as the Fab 18 facility are expected to reach full recovery later tonight. A small number of tools were damaged at certain facilities, partially impacting their operations. However, there is no damage to our critical tools including all of our extreme ultraviolet (EUV) lithography tools. Certain production lines in areas which experienced greater seismic impact are expected to require more time for adjustment and calibration before returning to fully automated production.

TSMC is deploying all available resources for full recovery, and is continuing to resume production. We are in close communication with our customers, and will continue to monitor the situation closely and communicate directly with customers as appropriate.