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 April 2006

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 þ Form 40-F o

     (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 o No þ

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

Taiwan Semiconductor Manufacturing Company Limited

For the month of April 2006

This is to report 1) the changes in the shareholdings of our directors, supervisors, executive officers and shareholders who own more than 10% of total outstanding common shares of Taiwan Semiconductor Manufacturing Company Ltd. (The Company; “TSMC”) (NYSE:TSM); 2) the pledge and clear of pledge of TSMC common shares by our directors, supervisors, executive officers and shareholders who own more than 10% of total outstanding common shares of TSMC; 3) the acquisition of assets by TSMC and 4) the disposition of assets by TSMC for the month of April 2006.

1) The changes in the shareholdings of our directors, supervisors, executive officers and shareholders who own more than 10% of total outstanding common shares:

		Number of shares held as of		Number of shares held as of
Title	Name	February 28, 2006		March 31, 2006		Changes
Director & Vice Chairman	F. C. Tseng		39,120,891		38,890,891		-230,000
Director, President & CEO	Rick Tsai		25,576,795		25,346,795		-230,000
Senior Vice President	Kenneth Kin		3,259,860		3,244,860		-15,000
Senior Vice President	Stephen T. Tso		12,036,380		12,026,380		-10,000
Senior Vice President	C. C. Wei		5,388,079		5,343,079		-45,000
Senior Vice President	Mark Liu		9,897,792		9,827,792		-70,000
Vice President & General Counsel	Richard Thurston		2,244,211		2,214,211		-30,000
Vice President	Wei-Jen Lo		502,552		492,552		-10,000
Vice President	Jason C.S. Chen		361,000		352,000		-9,000
Senior Director	L.C. Tu		7,914,827		7,872,827		-42,000

2)	The pledge and clear of pledge of TSMC common shares by our directors, supervisors, executive officers and shareholders who own more than 10% of total outstanding common shares: None.
3)	The acquisition of assets:

Description of assets	Purchase price
Manufacturing Equipment	NT$9,092,664,063
Corporate Bonds	NT$997,620,980
Facility and engineering equipment	NT$611,814,024

4) The disposition of assets: None.

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.

	Taiwan Semiconductor Manufacturing Company Ltd.
Date: April 25, 2006	By	/s/ Lora Ho
		Lora Ho
		Vice President & Chief Financial Officer