1934 Act Registration No. 1-14700

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2018

Taiwan Semiconductor Manufacturing Company Ltd.

(Translation of Registrant’s Name Into English)

No. 8, Li-Hsin Rd. 6,

Hsinchu Science Park,

Taiwan

(Address of Principal Executive Offices)

(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     V             Form 40-F                 

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes             No     V    

(If “Yes” is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82: _______.)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

TSMC Reports Third Quarter EPS of NT$3.44

Hsinchu, Taiwan, R.O.C., October 18, 2018 — TSMC today announced consolidated revenue of NT$260.35 billion, net income of NT$89.07 billion, and diluted earnings per share of NT$3.44 (US$0.56 per ADR unit) for the third quarter ended September 30, 2018.

Year-over-year, third quarter revenue increased 3.3% while net income and diluted EPS both decreased 0.9%. Compared to second quarter 2018, third quarter results represented an 11.6% increase in revenue and a 23.2% increase in net income. All figures were prepared in accordance with TIFRS on a consolidated basis.

In US dollars, third quarter revenue was $8.49 billion, which increased 8.1% from the previous quarter and 1.9% year-over-year.

Gross margin for the quarter was 47.4%, operating margin was 36.6%, and net profit margin was 34.2%.

In the third quarter, shipments of 7-nanometer accounted for 11% of total wafer revenue; 10-nanometer and 16/20-nanometer process technology accounted for 6% and 25% of total wafer revenue respectively; and advanced technologies, defined as 28-nanometer and more advanced technologies, accounted for 61% of total wafer revenue.

“Our third quarter business benefited from new product launches using TSMC 7-nanometer technology. Although the computer virus incident on August 3 was estimated to have impacted our third quarter revenue and gross margin by about 2 percent and 1 percent respectively, we were able to make up about 75 percent of the affected shipments in the third quarter,” said Lora Ho, SVP and Chief Financial Officer of TSMC. “Moving into fourth quarter 2018, we anticipate our business will continue to benefit from the strong demand for our 7-nanometer technology. Based on our current business outlook, management expects the overall performance for fourth quarter 2018 to be as follows”:

And, based on the exchange rate assumption of 1 US dollar to 30.8 NT dollars,

TSMC’s 2018 third quarter consolidated results:

(Unit: NT$ million, except for EPS)

About TSMC

TSMC is the world’s largest dedicated semiconductor foundry, providing the industry’s leading process technology and foundry’s largest portfolio of process-proven libraries, IPs, design tools and reference flows. The Company’s owned capacity in 2018 is expected to exceed 12 million (12-inch equivalent) wafers, including capacity from three advanced 12-inch GIGAFAB^® facilities, four eight-inch fabs, and one six-inch fab, in Taiwan, as well as TSMC’s wholly owned subsidiaries, WaferTech, TSMC China, and TSMC Nanjing. TSMC is the first foundry to provide 7-nanometer production capabilities. Its corporate headquarters are in Hsinchu, Taiwan. For more information about TSMC please visit http://www.tsmc.com.

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