Schedule 13G

-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, UPvC2NFH0XyR8T8JzLvW8EMihNO6OdHrdidAgGlD5fqNTzLVam1l9+bZXkj+FrvZ Y7wZrkIY3/99XnCKNy9F6Q== 0001193125-05-081242.txt : 20050421 0001193125-05-081242.hdr.sgml : 20050421 20050421100444 ACCESSION NUMBER: 0001193125-05-081242 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20050421 DATE AS OF CHANGE: 20050421 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: HUTCHINSON TECHNOLOGY INC CENTRAL INDEX KEY: 0000772897 STANDARD INDUSTRIAL CLASSIFICATION: ELECTRONIC COMPONENTS, NEC [3679] IRS NUMBER: 410901840 STATE OF INCORPORATION: MN FISCAL YEAR END: 0929 FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-37228 FILM NUMBER: 05763421 BUSINESS ADDRESS: STREET 1: 40 W HIGHLAND PARK CITY: HUTCHINSON STATE: MN ZIP: 55350 BUSINESS PHONE: 3205873797 MAIL ADDRESS: STREET 1: 40 W HIGHLAND PARK STREET 2: 40 W HIGHLAND PARK CITY: HUTCHINSON STATE: MN ZIP: 55350 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: GRANAHAN INVESTMENT MANAGEMENT INC/MA CENTRAL INDEX KEY: 0001026710 IRS NUMBER: 042856200 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 275 WYMAN STREET STREET 2: SUITE 270 CITY: WALTHAM STATE: MA ZIP: 02451 BUSINESS PHONE: 7818904412 MAIL ADDRESS: STREET 1: 275 WYMAN ST STREET 2: STE 270 CITY: WALTHAM STATE: MA ZIP: 02451 SC 13G 1 dsc13g.htm SCHEDULE 13G Schedule 13G

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Information to be Included in Statements Filed

Pursuant to Rules 13d-1(b), (c) and (d) and Amendments

Thereto Filed Pursuant to Rule 13d-2(b)

Under the Securities Exchange Act of 1934

(Amendment No. )*

Hutchinson Technology Incorporated

(Name of Issuer)

Common Stock, $0.01 Par Value

(Title of Class of Securities)

448407106

(CUSIP Number)

December 31, 2004

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

x Rule 13d-1(b)

¨ Rule 13d-1(c)

¨ Rule 13d-1(d)

The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


CUSIP NO. 448407106		13G		Page 2 of 5 Pages


1		NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Granahan Investment Management, Inc. 04-2856200
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) ¨ (b) ¨
3		SEC USE ONLY
4		CITIZENSHIP OR PLACE OF ORGANIZATION Massachusetts

NUMBER OF

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

5 SOLE VOTING POWER

283,100

6 SHARED VOTING POWER

1,006,930

7 SOLE DISPOSITIVE POWER

1,290,030

8 SHARED DISPOSITIVE POWER


9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,290,030
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.14%
12	TYPE OF REPORTING PERSON* IA

*SEE INSTRUCTIONS BEFORE FILLING OUT!

Page 2 of 5 pages

Item 1

(a).

Name of Issuer:

Hutchinson Technology Incorporated

Item 1

(b).

Address of Issuer’s Principal Executive Offices:

40 West Highland Park Drive N.E.

Hutchinson, Minnesota 55350

Item 2

(a).

Name of Person Filing:

Granahan Investment Management, Inc.

Item 2

(b).

Address of Principal Business Office or, if None, Residence:

275 Wyman Street, Suite 270

Waltham, MA 02154

Item 2

(c).

Citizenship:

Massachusetts

Item 2

(d).

Title of Class of Securities:

Common Stock

Item 2

(e).

CUSIP Number:

448407106

Item 3.

If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

(a)

Broker or dealer registered under Section 15 of the Exchange Act.

(b)

Bank as defined in Section 3(a)(6) of the Exchange Act.

(c)

Insurance company as defined in Section 3(a)(19) of the Exchange Act.

(d)

Investment company registered under Section 8 of the Investment Company Act.

(e)

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E).

(f)

An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F).

(g)

A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G).

(h)

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.

(i)

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act.

(j)

Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

If this statement is filed pursuant to Rule 13d-1(c), check this box. ¨

Page 3 of 5 pages



Item 4.	Ownership

	Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

	(a)	Amount beneficially owned: 1,290,030

	(b)	Percent of class: 5.14%

	(c)	Number of shares as to which such person has:

		(i)	sole power to vote or to direct the vote: 283,100

		(ii)	shared power to vote or to direct the vote: 1,006,930

		(iii)	sole power to dispose or to direct the disposition of: 1,290,030

		(iv)	shared power to dispose or to direct the disposition of: 0

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 hereof 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 Percent on Behalf of Another Person

	Not Applicable

Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company

	Not Applicable

Item 8.	Identification and Classification of Members of the Group

	Not Applicable

Item 9.	Notice of Dissolution of Group

	Not Applicable

Item 10.	Certification

	By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Page 4 of 5 pages

SIGNATURE

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.


	GRANAHAN INVESTMENT MANAGEMENT, INC.

Date: April 21, 2005	By:	/s/ John J. Granahan
	Name/Title	John J. Granahan, President

Page 5 of 5 pages

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