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

                                  SCHEDULE 13D
                                 Amendment No. 4

                    Under the Securities Exchange Act of 1934

                             GULFMARK OFFSHORE, INC.
                                (Name of Issuer)

                          Common Stock, par value $0.01
                         (Title of Class of Securities)

                                    402629109
                                 (CUSIP Number)

                               Jeffrey A. Welikson
                          Vice President and Secretary
                          Lehman Brothers Holdings Inc.
                                 399 Park Avenue
                               New York, NY 10022
                                 (212) 526-0858

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   See Item 5.
                      (Date of Event which Requires Filing
                               of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].


CUSIP No.   402629109

1)  Name of Reporting Person

     Lehman Brothers Holdings Inc.

     S.S. or I.R.S. Identification No. of Above Person

     13-3216325

2) Check the Appropriate box if a Member of a Group (see instructions)

     (a) [ ] 
     (b) [ ]

3)  SEC Use Only

4)  Source of Funds (see instructions)
     OO

5) Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 
   2(d) or 2(e)   [ ]

6)  Citizenship or Place of Organization
      Delaware

Number of Shares Beneficially Owned by Each Reporting Person With:

         7)  Sole Voting Power
             3,477,090*

         8)  Shared Voting Power
             -0-

         9)  Sole Dispositive Power
             3,477,090*

         10) Shared Dispositive Power
             -0-

11) Aggregate Amount Beneficially Owned by Each Reporting Person
    3,477,090*

12)    Check if the Aggregate Amount in Row (11) Excludes Certain Shares [ ]

13) Percent of Class Represented by Amount in Row (11)
    17.29%

14) Type of Reporting Person
    HC/CO

* Reflects 2-for-1 stock split on June 30, 2002.



Schedule 13D

Item 1.  Security and Issuer

This statement relates to the Common Stock, par value $0.01 (the "Common
Stock"), of GulfMark Offshore, Inc., a Delaware corporation ("GulfMark
Offshore"). The address of the principal executive offices of GulfMark Offshore
is 10111 Richmond Avenue, Suite 340, Houston, Texas 77042.

Item 2.  Identity and Background

This statement is filed on behalf of Lehman  Brothers  Holdings Inc., a Delaware
corporation  ("Holdings"),  745 Seventh  Avenue,  New York, New York 10019.

Holdings is one of the leading global investment banks, serving institutional,
corporate, government and high-net-worth clients and customers.

The names, residence or business addresses, citizenships and present principal
occupations or employment of the senior executive officers and directors of
Holdings are set forth in Appendix A hereto.

Holdings is the managing partner of Shearson Oil Services Partners ("SOS
Partners"), a partnership formed in 1989 to hold, among other things, shares of
common stock of Gulfmark International, Inc. ("Gulfmark International"), from
which GulfMark Offshore was spun off in 1997, and which holds the shares of
Common Stock reported herein. Holdings contributed 100% of the capital of SOS
Partners. David J. Butters and Robert B. Millard, the other partners of SOS
Partners, are each entitled to receive 5.625% of the profits of SOS Partners
after Holdings has received distributions equal to its capital investment plus a
return on its capital equal to its cost of funds.

Messrs. Butters and Millard, each of whom are U.S. citizens, are directors of
GulfMark Offshore and are Managing Directors of Lehman Brothers Inc., a direct,
wholly-owned subsidiary of Holdings.

Neither the Reporting Person nor, to the best knowledge of the Reporting Person,
either of Messrs. Butters or Millard or any of the persons listed in Appendix A
hereto has during the last five years (i) been convicted in a criminal
proceeding (excluding traffic violations or similar misdemeanors) or (ii) been
party to a civil proceeding of a judicial or administrative body of a competent
jurisdiction and as a result of such proceeding was or is subject to a judgment,
decree or final order enjoining future violations of, or mandating activities
subject to, federal or state securities laws or finding any violation with
respect to such laws.

Item 3.  Source of Funds or Other Consideration

No change.

Item 4.  Purpose of Transaction

No change.

The Reporting Person intends to evaluate continually the business, prospects and
financial condition of GulfMark Offshore, the market for shares of Common Stock,
other opportunities available to the Reporting Person, general economic
conditions, money and stock market conditions and other factors and future
developments which the Reporting Person may deem relevant from time to time.
Depending on these factors, the Reporting Person may decide to sell all or part
of the Common Stock that it holds. Any disposition, or any further acquisition,
may be effected through privately negotiated transactions, donations to
charitable organizations or otherwise.

Except as set forth in this Report, as amended, the Reporting Person does not
have any specific plans or proposals that relate to or would result in any of
the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer

On June 30, 2002, Gulfmark Offshore effected a two-for-one common stock split.
Since the filing of the Reporting Person's Amendment No.3 to Schedule 13D on
March 19, 2004, there has been no other change to the amount of the Common Stock
beneficially owned by the Reporting Person, except as set forth in paragraph (c)
below. Percentages are based on 20,114,744 shares of Common Stock outstanding as
of November 9, 2004, as reported in GulfMark Offshore's most recent Quarterly
Report on Form 10-Q.

(a)  See cover page. As partners of SOS Partners, Messrs. Butters and Millard
     may each be deemed to beneficially own the shares of Common Stock held by
     SOS Partners; however, each of them disclaims beneficial ownership of such
     shares except to the extent of his pecuniary interest therein.

(b)  See cover page. As partners of SOS Partners, Messrs. Butters and Millard
     may each be deemed to share with Holdings and each other the power to vote
     or direct the vote or to dispose or direct the disposition of the shares of
     Common Stock held by SOS Partners; however, each of them disclaims
     beneficial ownership of such shares except to the extent of his pecuniary
     interest therein.

(c)  On June 18, 2004, SOS Partners made a distribution of 18,028 shares of the
     Common Stock to its partners as follows:

            Holdings                                             16,000
            David J. Butters                                      1,014
            Robert B. Millard                                     1,014

     On September 16, 2004, SOS Partners made a distribution of 165,334 shares
     of the Common Stock to its partners as follows:

            Holdings                                            146,734
            David J. Butters                                      9,300
            Robert B. Millard                                     9,300

     On January 12, 2005 SOS Partners made a distribution of 200,000 shares of
     the Common Stock to its partners as follows:

            Holdings                                            177,500
            David J. Butters                                     11,250
            Robert B. Millard                                    11,250



     On June 18, 2004, September 16, 2004 and January 12, 2005 respectively,
     Holdings donated the 16,000, 146,734 and 200,000 shares of Common Stock
     received in the distributions to The Lehman Brothers Foundation (the
     "Foundation"), a tax-exempt private foundation under Section 501(c)(3) of
     Internal Revenue Code. The Foundation has informed Holdings that it
     currently intends to sell all of such shares pursuant to Rule 144 under the
     Securities Act of 1933, as amended, within a reasonable time.

(d) See Item 2.

(e) Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

No change except as described above in Item 2.

Item 7.  Material to be Filed as Exhibits.

Agreement  and Plan of Merger,  dated as of December 5, 1996,  among  Energy  
Ventures,  Inc.  ("EVI"),  GulfMark  Acquisition  Co. and GulfMark International
(incorporated by reference to Exhibit 2.2 to Form 8-K, File No. 0-7265, filed 
December 26, 1996)

Agreement and Plan of Distribution, dated as of dated as of December 5, 1996,
among EVI, GulfMark International and GulfMark Offshore (incorporated by
reference to Exhibit 2.3 to Form 8-K, File No. 0-7265, filed December 26, 1996)

Letter Agreement, dated March 14, 1997 (incorporated by reference to Exhibit A
to the Reporting Person's Schedule 13D filed May 12, 1997.)

Partnership Agreement of SOS Partners, dated as of September 6, 1989
(incorporated by reference to Exhibit 99 to the Reporting Person's Schedule 13D
Amendment No.3 filed May 19, 2004.)



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.


Dated:  January 19, 2005


LEHMAN BROTHERS HOLDINGS INC.

By:   /s/ Barrett S. DiPaolo
Name: Barrett S. DiPaolo
Title:Vice President

                                   APPENDIX A

                          LEHMAN BROTHERS HOLDINGS INC.

                               BOARD OF DIRECTORS



NAME / TITLE                              BUSINESS ADDRESS

Michael L. Ainslie                        Lehman Brothers Holdings Inc.
Private Investor and former               745 Seventh Avenue
President and Chief Executive             New York, New York 10019
Officer of Sotheby's Holdings

John F. Akers                             Lehman Brothers Holdings Inc.
Retired Chairman of                       745 Seventh Avenue
International Business Machines           New York, New York 10019
Corporation

Roger S. Berlind                          Lehman Brothers Holdings Inc.
Theatrical Producer                       745 Seventh Avenue
                                          New York, New York 10019

Thomas H. Cruikshank                      Lehman Brothers Holdings Inc.
Retired Chairman and Chief                745 Seventh Avenue
Executive Officer of Halliburton          New York, New York 10019
Company

Marsha Johnson Evans                      Lehman Brothers Holdings Inc.
President of American Red Cross           745 Seventh Avenue
                                          New York, New York 10019

Richard S. Fuld, Jr.                      Lehman Brothers Holdings Inc.
Chairman and Chief Executive              745 Seventh Avenue
Officer of                                New York, New York 10019
Lehman Brothers Holdings Inc.

Sir Christopher Gent                      Lehman Brothers Holdings Inc.
Non-Executive Deputy                      745 Seventh Avenue
Chairman of GlaxoSmithKline plc           New York, New York 10019

Henry Kaufman                             Lehman Brothers Holdings Inc.
President of Henry Kaufman &              745 Seventh Avenue
Company, Inc.                             New York, New York 10019

John D. Macomber                          Lehman Brothers Holdings Inc.
Principal of JDM Investment Group         745 Seventh Avenue
                                          New York, New York 10019

Dina Merrill                              Lehman Brothers Holdings Inc.
Director and Vice                         745 Seventh Avenue
Chairman of RKO Pictures, Inc.            New York, New York 10019
and Actress


All of the above individuals are citizens of the United States, except for Sir
Christopher Gent, who is a citizen of the United Kingdom.


                          LEHMAN BROTHERS HOLDINGS INC.

                               EXECUTIVE OFFICERS


NAME / TITLE                          BUSINESS ADDRESS

Richard S. Fuld, Jr.                    Lehman Brothers Holdings Inc.
Chairman and Chief Executive Officer    745 Seventh Avenue
                                        New York, New York 10019


Jonathan E. Beyman                      Lehman Brothers Holdings Inc.
Chief of Operations and Technology      745 Seventh Avenue
                                        New York, NY 10019

David Goldfarb                          Lehman Brothers Holdings Inc.
Chief Administrative Officer            745 Seventh Avenue
                                        New York, New York 10019

Joseph M. Gregory                       Lehman Brothers Holdings Inc.
President and Chief Operating Officer   745 Seventh Avenue
                                        New York, New York 10019

Christopher O'Meara                     Lehman Brothers Holdings Inc.
Chief Financial Officer and Controller  745 Seventh Avenue
                                        New York, New York 10019

Thomas A. Russo                         Lehman Brothers Holdings Inc.
Chief Legal Officer                     745 Seventh Avenue
                                        New York, NY 10019

All of the above individuals are citizens of the United States.