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美国证券交易委员会华盛顿特区20549年附表13G根据1934年的《证券交易法》，发行人KLA-Tencor Corporation的名称，证券类COUSIP编号482480100本封面的其余部分应填写，以填写报告人员的初始报告。就此表格提交有关主题类别的证券类别，以及随后的任何修正案，其中包含将改变先前封面中提供的披露的信息。本封面其余部分中要求的信息不应被视为为1934年《证券交易法》第18条（“法案”）或以其他方式遵守该法令的责任，但应遵守该法案的所有其他规定（但是，请参见票据）。第1页，共10页13G CUSIP编号482480100第2页，共10页 - -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 1.报告名称S.S.或I.R.S.身份证号码。上述人Marsh＆McLennan Companies，Inc。36-2668272 - ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 2.检查适当的框组的成员*（a）（）（b）（） - -------------------------------------------------------------------------------------------------------------------------------- 3. SEC使用只要 - - - - - - - - - - - - - - - - - - - - - - - - ----------------------------- - ---------- 4. Citizenship or place of organization Delaware - -------------------------------------------------------------------- - ---------- 5. Sole Voting Power NONE ----------------------------- Number of shares ) 6. Shared Voting Power Beneficially ) Owned by each ) NONE Reporting ) ----------------------------- Person with: ) 7. Sole Dispositive Power NONE ----------------------------- 8. Shared Dispositive Power NONE - -------------------------------------------------------------------- - ---------- 9. Aggregate amount beneficially owned by each reporting person NONE - -------------------------------------------------------------------- - ---------- 10. Check box if the aggregate amount in row (9) excludes certain shares* - -------------------------------------------------------------------- - ---------- 11. Percent of class represented by amount in row 9 NONE - -------------------------------------------------------------------- - ---------- 12. Type of Reporting person* HC - -------------------------------------------------------------------- - ---------- 13G CUSIP No. 482480100 Page 3 of 10 Pages - -------------------------------------------------------------------- - ---------- 1. Name of reporting person S.S. or I.R.S. identification no. of above person Putnam Investments, Inc. 04-2539558 - -------------------------------------------------------------------- - ---------- 2. Check the appropriate box if a member of a group* (a)( ) (b)( ) - -------------------------------------------------------------------- - ---------- 3. SEC use only - -------------------------------------------------------------------- - ---------- 4. Citizenship or place of organization Massachusetts - -------------------------------------------------------------------- - ---------- 5. Sole Voting Power NONE Number of shares ) ---------------------------- - - Beneficially ) 6. Shared Voting Power owned by each ) 55,300 Reporting ) Person with: ) ----------------------------- 7. Sole Dispositive Power NONE ----------------------------- 8. Shared Dispositive Power 4,872,900 - -------------------------------------------------------------------- - ---------- 9. Aggregate amount beneficially owned by each reporting person 4,872,900 - -------------------------------------------------------------------- - ---------- 10. Check box if the aggregate amount in row (9) excludes certain shares* - -------------------------------------------------------------------- - ---------- 11. Percent of class represented by amount in row 9 5.4% - -------------------------------------------------------------------- - ---------- 12. Type of Reporting person* HC - -------------------------------------------------------------------- - ---------- 13G CUSIP No. 482480100 Page 4 of 10 Pages - -------------------------------------------------------------------- - ---------- 1. Name of reporting person S.S. or I.R.S. identification no. of above person Putnam Investment Management, Inc. 04-2471937 - -------------------------------------------------------------------- - ---------- 2. Check the appropriate box if a member of a group* (a)( ) (b)( ) - -------------------------------------------------------------------- - ---------- 3. SEC use only - -------------------------------------------------------------------- - ---------- 4. Citizenship or place of organization Massachusetts - -------------------------------------------------------------------- - ---------- 5. Sole Voting Power NONE Number of shares ) ---------------------------- - - Beneficially ) 6. Shared Voting Power Owned by each ) Reporting ) NONE Person with: ) ----------------------------- 7. Sole Dispositive Power NONE ----------------------------- 8. Shared Dispositive Power 4,539,970 - -------------------------------------------------------------------- - ---------- 9. Aggregate amount beneficially owned by each reporting person 4,539,970 - -------------------------------------------------------------------- - ---------- 10. Check box if the aggregate amount in row (9) excludes certain shares* - -------------------------------------------------------------------- - ---------- 11. Percent of class represented by amount in row 9 5.0% - -------------------------------------------------------------------- - ---------- 12. Type of Reporting person* IA - -------------------------------------------------------------------- ---------- 13G CUSIP No. 482480100 Page 5 of 10 Pages - -------------------------------------------------------------------- - ---------- 1. Name of reporting person S.S. or I.R.S. identification no. of above person The Putnam Advisory Company, Inc. 04-6187127 - -------------------------------------------------------------------- - ---------- 2. Check the appropriate box if a member of a group* (a)( ) (b)( ) - -------------------------------------------------------------------- - ---------- 3. SEC use only - -------------------------------------------------------------------- - ---------- 4. Citizenship or place of organization Massachusetts - -------------------------------------------------------------------- - ---------- 5. Sole Voting Power NONE Number of shares ) ---------------------------- - - Beneficially ) 6. Shared Voting Power Owned by each ) Reporting ) 55,300 Person with: ) ----------------------------- 7. Sole Dispositive Power NONE ----------------------------- 8. Shared Dispositive Power 332,930 - -------------------------------------------------------------------- - ---------- 9. Aggregate amount beneficially owned by each reporting person 332,930 - -------------------------------------------------------------------- - ---------- 10. Check box if the aggregate amount in row (9) excludes certain shares* - -------------------------------------------------------------------- - ---------- 11. Percent of class represented by amount in row 9 0.4% - -------------------------------------------------------------------- - ---------- 12. Type of Reporting person* IA - -------------------------------------------------------------------- - ---------- SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) Item 1(a) Name of Issuer: KLA-TENCOR CORPORATION Item 1(b) Address of Issuer's Principal Executive Offices: 160 Rio Robles, San Jose, CA 95134, Item 2(a) Item 2(b) Name of Person Filing: Address or Principal Office or, if NONE, Residence: Putnam Investments, Inc. One Post Office Square ("PI") Boston, Massachusetts 02109 on behalf of itself and: *Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas ("MMC") New York, NY 10036 Putnam Investment Management, Inc. One Post Office Square ("PIM") Boston, Massachusetts 02109 The Putnam Advisory Company, Inc. One Post Office Square ("PAC") Boston, Massachusetts 02109 Item 2(c) Citizenship: PI, PIM and PAC are corporations organized under Massachusetts law. The citizenship of other persons identified in Item 2(a) is designated as follows: * Corporation - Delaware law ** Voluntary association known as Massachusetts business trust - Massachusetts law Item 2(d) Title of Class of Securities: Common Item 2(e) Cusip Number: 482480100 Page 6 of 10 Pages Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: (a)( ) Broker or Dealer registered under Section 15 of the Act (b)( ) Bank as defined in Section 3(a)(6) of the Act (c)( ) Insurance Company as defined in Section 3(a)(19) of the Act (d)( ) Investment Company registered under Section 8 of the Investment Company Act (e)( X ) Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940 (f)( ) Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see (Section 240.13d-1(b)(1)(ii)(F) (g)( X ) Parent Holding Company, in accordance with Section 240.13d-1(b)(ii)(G) (h)( ) Group, in accordance with Section 240.13d-1(b)(1)(ii)(H) Page 7 of 10 Pages

Item 5. Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date thereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ( ). Item 6. Ownership of More than Five/Ten Percent on Behalf of Another Person: No persons other than the persons filing this Schedule 13G have an economic interest in the securities reported on which relates to more than five percent of the class of securities. Securities reported on this Schedule 13G as being beneficially owned by M&MC and PI consist of securities beneficially owned by subsidiaries of PI which are registered investment advisers, which in turn include securities beneficially owned by clients of such investment advisers, which clients may include investment companies registered under the Investment Company Act and/or employee benefit plans, pension funds, endowment funds or other institutional clients. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company. PI, which is a wholly-owned subsidiary of M&MC, wholly owns two registered investment advisers: Putnam Investment Management, Inc., which is the investment adviser to the Putnam family of mutual funds and The Putnam Advisory Company, Inc., which is the investment adviser to Putnam's institutional clients. Both subsidiaries have dispository power over the shares as investment managers, but each of the mutual fund's trustees have voting power over the shares held by each fund, and The Putnam Advisory Company, Inc. has shared voting power over the shares held by the institutional clients. Pursuant to Rule 13d-4, M&MC and PI declare that the filing of this Schedule 13G shall not be deemed an admission by either or both of them that they are, for the purposes of Section 13(d) or 13(g) the beneficial owner of any securities covered by this Section 13G, and further state that neither of them have any power to vote or dispose of, or direct the voting or disposition of, any of the securities covered by this Schedule 13G. Item 8. Identification and Classification of Members of the Group: Not applicable. Item 9. Notice of Dissolution of Group: Not applicable. Item 10. Certification. Page 9 of 10 Pages By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business, were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. PUTNAM INVESTMENTS, INC. /s/Andrew J. Hachey BY: ------------------------------------------- Signature Name/Title: Andrew J. Hachey Assistant Vice President and Regulatory Compliance Counsel Date: February 7, 2000 For this and all future filings, reference is made to Power of Attorney dated April 30, 1999, with respect to duly authorized signatures on behalf of Marsh & McLennan Companies, Inc., Putnam Investments, Inc., Putnam Investment Management, Inc., The Putnam Advisory Company, Inc. and any Putnam Fund wherever applicable. For this and all future filings, reference is made to an Agreement dated June 28, 1990, with respect to one filing of Schedule 13G on behalf of said entities, pursuant to Rule 13d-1(f)(1). Page 10 of 10 Pages