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 an earthquake on April 3 reaching magnitude level 7.2 (the largest in Taiwan over the past 25 years).

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

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 April 3 earthquake, with new fabs such as the Fab 18 facility reaching more than 80%. Thanks to the collaborative efforts of TSMC colleagues and our supplier partners, we were fully recovered by the end of the third day. At the same time, we are maintaining close contact with customers and communicating with them regarding impact as appropriate.

There were no power outages, no structural damage to our fabs, and there is no damage to our critical tools, including all of our EUV lithography tools. That being said, a certain number of wafers in process were impacted and had to be scrapped, but we expect most of the lost production to be recovered in the second quarter, and thus minimal impact to our second quarter revenue. We expect the total impact from the earthquake to reduce our second quarter gross margin by about 50 basis points, mainly due to the losses associated with wafer scraps and materials loss. TSMC maintains its full-year revenue guidance of low-to-mid-twenties percentage growth given at the January institutional investors' conference. Based on a preliminary assessment, the Company estimated related earthquake losses to be approximately NT$3 billion, net of insurance claim, and will recognize it in the second quarter of 2024.