MACRONIX INTERNATIONAL CO LTD 6-K

File No. 0-27884

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Issuer
Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934

For the month of May, 2006

Macronix International Co., Ltd.

No. 16 Li-Hsing Road,
Science-Based Industrial Park
Hsinchu, Taiwan, Republic of China

[Indicate by check mark whether the registrant files or will file annual reports under cover 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, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82: .]

Table of Contents


Monthly Sales Report- May 2006			3

Regulated Announcement for the month of May 2006			3~5

Signatures			6

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Monthly Sales Report — May 2006

Regulated Announcement for the month of May 2006

MACRONIX INTERNATIONAL CO., LTD.
For the month of May 2006

This is to report the changes or status of 1) Sales volume 2) Funds lent to other parties 3) Endorsements and guarantees 4) Financial derivative transactions for the period of May 2006.

Sales volume (NT$: Thousand)


Time	Item	2006		2005		Changes		(%)
May	Invoice amount		1,692,339		1,292,866		399,473		30.90	%
May	Net Sales		1,690,586		1,286,645		403,941		31.39	%

Funds lent to other parties (NT$: Thousand):

Endorsements and guarantees (NT$: Thousand):


	Limit of endorsement		May		Bal. As of period end
MXIC		14,449,102		-261,004		1,231,361
MXIC’s subsidiaries		0		0		0
MXIC endorses for subsidiaries				0		1,231,361
MXIC’s subsidiaries endorses for MXIC				0		0
MXIC endorses for PRC companies				0		0
MXIC’s subsidiaries endorses for PRC companies				0		0

Financial derivatives transactions (NT$: Thousand)

4-1 Trading purpose:


				Option
		Future		Sell				Buy				Forward		Swap		Others
				Call		Put		Call		Put
Margin Payment			—		—		—		—		—		—		—		—
Premium Income (Expense)			—		—		—		—		—		—		—		—
Outstanding Contract	Notional Amount		—		—		—		—		—		—		—		—
	Mark to Market Value		—		—		—		—		—		—		—		—
Expired Contract	Notional Amount		—		—		—		—		—		—		—		1,147,200
	Recognized Amount		—		—		—		—		—		—		—		2,413

4-1 Hedging purpose (for assets/liabilities denominated in foreign currencies): None

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MACRONIX INTERNATIONAL CO., LTD.
For the month of May 2005

This is to report 1) the trading of directors, supervisors, executive officers and 10% shareholders of MXIC; 2) the pledge and clear of pledge of MXIC common shares by directors, supervisors, executive officers and 10% shareholders of MXIC; 3) outstanding units and shares of ADR; 4) outstanding amount of Convertible Bonds by MXIC for the month of May 2005.

The trading of directors, supervisors, executive officers and 10% shareholders:


		Number of
		shares held when
		elected (for
		Directors,
		Supervisors and		Number of		Number of shares
		Executive		shares held as		held as
Title	Name	Officers)		April 30, 2006		May 31, 2006		Changes
Chairman & President	Miin Wu		30,932,711		30,932,711		18,055,841	-12,876,870 (Reverse Split)
Executive Director	Ding Hua Hu		4,000,283		4,000,283		2,620,867	-1,869,123 (Reverse Split)
Executive Director	C.H. Chen		4,328,906		3,516,906		603,647	-430,504 (Reverse Split)
Director & Vice President	Tom Yiu		19,172,119		17,287,119		10,090,724	-7,196,395 (Reverse Split)
Director & Vice President	Ray Mac		6,930,638		6,930,638		4,045,506	-2,885,132 (Reverse Split)
Director & Vice President	C.Y. Lu		2,325,224		2,325,224		1,357,264	-967,960 (Reverse Split)
Director & Vice President	Simon Wang		6,495,252		5,634,252		3,288,788	-2,345,464 (Reverse Split)
Director & Vice President	J.P. Peng		7,070,767		6,043,520		3,527,684	-2,515,836 (Reverse Split)
Independent Director	C.Y. Fang		1,086,739		1,086,739		634,344	-452,395 (Reverse Split)
Independent Supervisor	P.T. Wu		198,489		198,489		210,659	-150,236 (Reverse Split)
Associate Vice President	Y.L. Lin		0		6,126,413		3,547,547	-27,355 -2,551,511 (Reverse Split)
Associate Vice President	J.T. Chung		0		2,900,760		1,688,437	-1,212,323 (Reverse Split)
Associate Vice President	Y.H. Chao		0		351,430		205,134	-146,296 (Reverse Split)
Associate Vice President	Allen Dai		0		200,646		117,119	-83,527 (Reverse Split)

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		Number of
		shares held when
		elected (for
		Directors,
		Supervisors and		Number of		Number of shares
		Executive		shares held as		held as
Title	Name	Officers)		April 30, 2006		May 31, 2006		Changes
Associate Vice President	C.D. Lin		0		1,949,822		1,913,822	-36,000
Associate Vice President	T.J. Lu		0		257,129		150,089	-107,040 (Reverse Split)
Associate Vice President	Joseph Gu		0		324,055		189,155	-134,900 (Reverse Split)
Associate Vice President	Shaw Yi		0		133,000		77,633	-55,367 (Reverse Split)
Associate Vice President	C.D. Lin		0		1,913,822		1,117,123	-796,699 (Reverse Split)
Associate Vice President	F.L. Ni		0		1,944,258		1,134,889	-809,369 (Reverse Split)
Associate Vice President	Albert Sun		0		130,503		76,176	-54,327 (Reverse Split)
Associate Vice President	Winston Chen		0		73,267		42,766	-30,501 (Reverse Split)
Associate Vice President	H.S. Pyi		0		242,524		141,564	-141,564 (Reverse Split)
Associate Vice President	C.H. Hung		0		210,500		122,871	-87,629 (Reverse Split)
Associate Vice President	W.S. Pang		0		19,494		11,644	-7,850 (Reverse Split)
Associate Vice President	Paul Yeh		0		7,739,102		4,472,418	-45,000 -3,221,684 (Reverse Split)

The clear of pledge of MXIC common shares by directors, supervisors, executive officers and 10% shareholders: None

The pledge of MXIC common shares by directors, supervisors, executive officers and 10% shareholders: None

Outstanding units and shares of ADR:


Outstanding of units on	Outstanding of shares	Outstanding of units on	Outstanding of shares
April 30, 2006	on April 30, 2006	May 31, 2006	on May 31, 2006
2,176,109.3	21,761,093	1,358,595.7	13,585,957

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MACRONIX INTERNATIONAL CO., LTD.
For the month of May 2006

This is to report 1) the acquisition of assets by MXIC and 2) the disposition of assets by MXIC for the month of May 2006.

The acquisition of assets : None

The disposal of assets : None

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SIGNATURES

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


	MACRONIX INTERNATIONAL CO., LTD.
Date: June 19, 2006	By:	/s/ Paul Yeh
		Name:	Paul Yeh
		Title:	Associate Vice President of Finance Center

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Bal. As of

Bal. As of

May, 2006 end

April, 2006 end

Limit of lending

MXIC’s subsidiaries