SEC FORM 4

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

TAN THIAN H

(Last)

(First)

(Middle)

1710 AUTOMATION PARKWAY

(Street)

SAN JOSE

95131

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
KOMAG INC /DE/ [ KOMG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2006

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	02/27/2006		M		12,500	A	$6.48	211,427	D
Common Stock	02/27/2006		M		15,000	A	$13.16	226,427	D
Common Stock	02/27/2006		M		7,500	A	$18.85	233,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$46.7332	232,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$46.7949	231,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$46.903	230,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$46.933	229,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.045	228,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.0759	227,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.139	226,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.1985	225,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.2099	224,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.2546	223,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.322	222,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.3268	221,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.339	220,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.3495	219,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.4408	218,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.4588	217,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.4981	216,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.5027	215,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.5069	214,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.5233	213,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.5432	212,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.6094	211,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.632	210,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.6664	209,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.6846	208,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.6857	207,927	D
Common Stock	02/27/2006		S⁽¹⁾		1,000	D	$47.7034	206,927	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Non-Qualified Stock Option (right to buy)	$6.48	02/27/2006		M			12,500	⁽²⁾	03/17/2013	Common Stock	12,500	$0.00	35,500	D
Non-Qualified Stock Option (right to buy)	$13.16	02/27/2006		M			15,000	⁽³⁾	07/25/2013	Common Stock	15,000	$0.00	35,000	D
Non-Qualified Stock Option (right to buy)	$18.85	02/27/2006		M			7,500	⁽⁴⁾	03/15/2014	Common Stock	7,500	$0.00	30,000	D

Explanation of Responses:

1. This trade was executed pursuant to a Rule 10b5-1 trading plan.

2. The Reporting Person exercised 12,500 shares of the 100,000 share option granted on 03/17/2003, of which 25,000 shares subject to the Option shall vest on 10/07/2003 and 1/36 of the remaining 75,000 shares subject to the Option shall vest on the 7th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates.

3. The Reporting Person exercised 15,000 shares of the 50,000 share option granted on 07/25/2003, of which 12,500 shares subject to the Option shall vest on 10/07/2003 and 1/36 of the remaining 37,500 shares subject to the Option shall vest on the 7th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates.

4. The Reporting Person exercised 7,500 shares of the 37,500 share option granted on 03/15/2004, of which 9,375 shares subject to the Option shall vest on 03/15/2005 and 1/36 of the remaining 28,125 shares subject to the Option shall vest on the 15th of each month thereafter, subject to the Optionee continuing to be a Participant of Komag Incorporated Amended and Restated 2002 Qualified Stock Plan on such dates.

Remarks:

Form 4 Filing 1 of 2 (continuation report): Related transactions effected by the Reporting Person on 02/27/2006 are reported on additional Form 4s.

	/s/ Jan Schwartz, Attorney-in-fact for Thian Hoo Tan	03/01/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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