As filed with the Securities and Exchange Commission on July 23, 2003
Registration No. 333-__________

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

Under
THE SECURITIES ACT OF 1933

KOMAG, INCORPORATED

(Exact name of registrant as specified in its charter)

Delaware	94-2914864
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1710 Automation Parkway
San Jose, California 95131
(Address of Principal Executive Offices)

Amended and Restated 2002 Qualified Stock Plan
Amended and Restated 2002 Employee Stock Purchase Plan
(Full title of the plans)

Thian Hoo Tan
Chief Executive Officer
1710 Automation Parkway
San Jose, California 95131
(408) 576-2000
(Name, address and telephone number of agent for service)

Copy to:
 
Page Mailliard, Esq.
Wilson Sonsini Goodrich & Rosati
Professional Corporation
650 Page Mill Road
Palo Alto, CA 94304
(650) 493-9300

CALCULATION OF REGISTRATION FEE

		Proposed		Proposed
Title of		Maximum		Maximum		Amount
Securities	Amount	Offering		Aggregate		of
to be	to be	Price Per		Offering		Registration
Registered (1)	Registered	Share(2)		Price		Fee
Common Stock, $0.01 par value, issuable pursuant to Amended and Restated 2002 Qualified Stock Plan	450,000 shares	$	12.70	$	5,715,000	$	462.34
Common Stock, $0.01 par value, issuable pursuant to Amended and Restated 2002 Employee Stock Purchase Plan	300,000 shares	$	12.70	$	3,810,000	$	308.23
TOTAL	750,000 shares		—	$	9,525,000	$	770.57

(1)

This Registration Statement shall also cover any additional shares of Common Stock which become issuable under the Registrant’s Amended and Restated 2002 Qualified Stock Plan, (the “Plan”) and the Registrant’s Amended and Restated 2002 Employee Stock Purchase Plan (the “ESPP”) by reason of any stock dividend, stock split, recapitalization or any other similar transaction effected without the Registrant’s receipt of consideration which results in an increase in the number of outstanding shares of the Registrant’s Common Stock.

(2)

The Proposed Maximum Offering Price Per Share was estimated in part pursuant to Rule 457(h) under the Securities Act, and, in part, pursuant to Rule 457(c) under the Securities Act. With respect to 450,000 shares which are subject to outstanding options to purchase Common Stock under the Plan and with respect to 300,000 shares of Common Stock available for future grant under the ESPP, the Proposed Maximum Offering Price Per Share was estimated pursuant to Rule 457(c) whereby the per share price was determined by reference to the average of the high and low prices for the Common Stock as reported by The Nasdaq National Market on July 17, 2003, which average was $12.70.

TABLE OF CONTENTS

PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
	Item 3. Incorporation of Documents by Reference.
	Item 4. Description of Securities.
	Item 5. Interests of Named Experts and Counsel.
	Item 6. Indemnification of Directors and Officers.
	Item 7. Exemption from Registration Claimed.
	Item 8. Exhibits.
	Item 9. Undertakings.
SIGNATURES
EXHIBIT INDEX
EXHIBIT 4.1
EXHIBIT 4.2
EXHIBIT 5.1
EXHIBIT 23.1
EXHIBIT 23.2

PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

     The following documents and information previously filed with the Securities and Exchange Commission by Komag, Incorporated (“Komag”) are hereby incorporated by reference into this Registration Statement and, pursuant to Rule 428 promulgated under the Securities Act of 1933, as amended, into the Prospectuses relating to this Registration Statement:

(1)	Komag’s Form 10-K Annual Report for the fiscal year ended December 29, 2002, and Quarterly Report on Form 10-Q for the quarter ended March 30, 2003.
(2)	The registration statement on Form S-8 (SEC File No. 333-101125) filed on November 12, 2002, filed under the Securities Act of 1933.

     All documents subsequently filed by Komag pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as amended, prior to the filing of a post-effective amendment which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this registration statement and to be part hereof from the date of filing such documents.

Item 4. Description of Securities.

     Not applicable.

Item 5. Interests of Named Experts and Counsel.

     Not applicable.

Item 6. Indemnification of Directors and Officers.

     Komag’s Certificate of Incorporation limits the liability of directors to the maximum extent permitted by Delaware law. Delaware law provides that directors of a company will not be personally liable for monetary damages for breach of their fiduciary duties as directors, except for liability (i) for any breach of their duty of loyalty to the company or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) for unlawful payments of dividends or unlawful stock repurchases or redemptions as provided in Section 174 of the Delaware General Corporation Law, or (iv) for any transaction from which the director derived an improper personal benefit.

     Komag’s Bylaws provide that Komag shall indemnify its officers and directors and may indemnify its employees and other agents to the fullest extent permitted by law. Komag believes that indemnification under its Bylaws covers at least negligence and gross negligence on the part of indemnified parties. Komag’s Bylaws also permit it to secure insurance on behalf of any officer, director, employee or other agent for any liability arising out of his or her actions in such capacity, regardless of whether the provisions of the General Corporation Law of Delaware would permit indemnification.

     Komag has entered into agreements to indemnify its directors and officers, in addition to the indemnification provided for under Delaware law, and in Komag’s Certificate of Incorporation and Bylaws. These agreements, among other things, indemnify Komag’s directors and officers for certain expenses (including attorneys’ fees), judgments, fines and settlement amounts incurred by any such person in any action or proceeding, including any action by or in the right of Komag, arising out of such person’s services as a director or officer of Komag, any subsidiary of Komag, or any other company or enterprise to which the person provides services at the request of Komag. Komag believes that these provisions and agreements are necessary to attract and retain qualified persons as directors and officers.

II-1

     The limited liability and indemnification provisions in our Certificate of Incorporation and Bylaws may discourage stockholders from bringing a lawsuit against our directors for breach of their fiduciary duty and may reduce the likelihood of derivative litigation against our directors and officers, even though a derivative action, if successful, might otherwise benefit us and our stockholders. Moreover, a stockholder’s investment in us may be adversely affected to the extent we pay the costs of settlement or damage awards against our directors and officers under these indemnification provisions.

Item 7. Exemption from Registration Claimed.

     Not applicable.

Item 8. Exhibits.

Exhibit
Number
4.1	Amended and Restated 2002 Qualified Stock Plan
4.2	Amended and Restated 2002 Qualified Employee Stock Purchase Plan
5.1	Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation
23.1	Consent of Ernst & Young LLP, Independent Auditors
23.2	Consent of KPMG LLP, Independent Auditors
23.3	Consent of Counsel (Contained in Exhibit 5.1)
24.1	Power of Attorney (see page II-4)

Item 9. Undertakings.

(1) Komag hereby undertakes:

(a)	To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement to include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement.
(b)	That, for the purpose of determining any liability under the Securities Act of 1933, as amended, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
(c)	To remove from registration by means of post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(2)

Komag hereby undertakes that, for purposes of determining any liability under the Securities Act 1933, as amended, each filing of Komag’s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended, (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)

Insofar as indemnification for liabilities arising under the Securities Act of 1933, as amended, may be permitted to directors, officers and controlling persons of Komag pursuant to the Delaware General

II-2

Corporation Law, the Certificate of Incorporation or the Bylaws of Komag, indemnification agreements entered into between Komag and its officers and directors, or otherwise, Komag has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933, as amended, and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by Komag of expenses incurred or paid by a director, officer or controlling person in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered hereunder, Komag will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933, as amended, and will be governed by the final adjudication of such issue.

II-3

SIGNATURES

     Pursuant to the requirements of the Securities Act 1933, as amended, Komag certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Jose, State of California, on this 23rd day of July 2003.

KOMAG, INCORPORATED
By:	/s/ Thian Hoo Tan
	Thian Hoo Tan Chief Executive Officer and Chairman

POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each such person whose signature appears below constitutes and appoints each of Thian Hoo Tan and Kathleen A. Bayless, as his attorney-in-fact, with full power of substitution, for him in any and all capacities, to sign any and all amendments to this registration statement on Form S-8 (including post-effective amendments), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said attorney-in-fact, or his substitute or substitutes, may do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

Signature	Capacity	Date
/s/ Thian Hoo Tan Thian Hoo Tan	Chief Executive Officer and Chairman	July 23, 2003
/s/ Kathleen A. Bayless Kathleen A. Bayless	Vice President and Chief Financial Officer	July 23, 2003
/s/ Paul Brahe Paul Brahe	Director	July 23, 2003
/s/ Chris A. Eyre Chris A. Eyre	Director	July 23, 2003
/s/ Neil S. Subin Neil S. Subin	Director	July 23, 2003
/s/ Kenneth R. Swimm Kenneth R. Swimm	Director	July 23, 2003
/s/ David G. Takata David G. Takata	Director	July 23, 2003
/s/ Harry Van Wickle Harry Van Wickle	Director	July 23, 2003
/s/ Raymond H. Wechsler Raymond H. Wechsler	Director	July 23, 2003
/s/ Michael Lee Workman Michael Lee Workman	Director	July 23, 2003

II-4

EXHIBIT INDEX

Exhibit
Number	Description
4.1	Amended and Restated 2002 Qualified Stock Plan
4.2	Amended and Restated 2002 Qualified Employee Stock Purchase Plan
5.1	Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation
23.1	Consent of Ernst & Young LLP, Independent Auditors
23.2	Consent of KPMG LLP, Independent Auditors
23.3	Consent of Counsel (Contained in Exhibit 5.1)
24.1	Power of Attorney (see page II-4)