Filing Compare · MACRONIX INTERNATIONAL CO LTD

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 ~~April~~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:~~___~~ .]

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Table of Contents

Monthly Sales Report — April 2006			3
Monthly Sales Report- May 2006			3
Regulated Announcement for the month of April 2006			3 ~ 5
Regulated Announcement for the month of May 2006			3~5
Signatures			6

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~~MACRONIX~~Monthly ~~INTERNATIONAL~~Sales ~~CO.,~~Report ~~LTD.~~ — May 2006

~~For~~Regulated Announcement for the month of ~~April~~ May 2006

~~This~~MACRONIX isINTERNATIONAL toCO., ~~report the changes or status of 1) Sales volume 2) Funds lent to other parties 3)~~LTD. ~~Endorsements~~For ~~and guarantees 4) Financial derivative transactions for~~ the ~~period~~month of ~~April~~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		~~2006~~		2005		~~2005~~		Changes		~~Changes~~		(%)		~~(%)~~
April	Invoice amount				1,845,274				1,328,690				516,584				38.88	%
May	Invoice amount		1,692,339				1,292,866				399,473				30.90	%
April	Net Sales				1,843,486				1,316,322				527,164				40.05	%
May	Net Sales		1,690,586				1,286,645				403,941				31.39	%

Funds lent to other parties (NT$: Thousand): ~~None~~

Endorsements and guarantees (NT$: Thousand): None

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		~~Option~~
								Sell								Buy
		Future				Sell								Buy								Forward				Swap				Others
				Future				Call				Put				Call				Put				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		~~1,116,400~~
	Recognized Amount		—		—		—		—		—		—		—		—		—		—		—		—		—		—		2,413		~~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

~~For~~This is to report 1) the ~~month~~trading of ~~April~~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.

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 April 2005.

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

		Number of		~~Number of~~
		shares held when		~~shares held when~~
		elected (for		~~elected (for~~
		Directors,		~~Directors,~~				~~Number of~~				~~Number of~~
		Supervisors and		~~Supervisors and~~		Number of		~~shares held as~~		Number of shares		~~shares held as~~
Title	Name			Executive Officers)				March 31,2006				April 30,2006			Changes
		Executive				shares held as				held as
Director & Vice President	J.P. Peng				7,070,767				6,043,520				6,043,520			+774,000
Title	Name	Officers)				April 30, 2006				May 31, 2006				Changes
																-774,000
Chairman & President	Miin Wu		30,932,711				30,932,711				18,055,841			-12,876,870(Reverse Split)
Associate Vice President	C.D. Lin				0				1,949,822				1,913,822			-36,000
Executive Director	Ding Hua Hu		4,000,283				4,000,283				2,620,867			-1,869,123(Reverse Split)
Associate Vice President	F.L. Ni				0				1,946,258				1,944,258			-2,000
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 on

Outstanding of units on

Outstanding of ~~units on~~shares

~~Outstanding of shares on~~

March 31, 2006

April 30, 2006

on April 30, 2006

May 31, 2006

on May 31, 2006

2,176,109.3

21,761,093

~~21,761,093~~

1,358,595.7

13,585,957

~~2,176,109.3~~

~~21,761,093~~

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MACRONIX INTERNATIONAL CO., LTD.

For the month of April 2006

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

The acquisition of assets: None

The disposal of assets: None

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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: May 15, 2006	By:	/s/ Paul Yeh
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