Document:

<PAGE>
                                                                     EXHIBIT 4.4

                             SUPPLEMENTAL INDENTURE

                                       to

                      Indenture dated as of August 26, 1997
                                for $150,000,000
                      9% Senior Subordinated Notes Due 2007

                                     between

                              DEGUELLE OIL COMPANY

                       as Additional Subsidiary Guarantor,

                                       and

                              The Bank of New York

                                   as Trustee

                     Dated effective as of February 10, 1998
<PAGE>
                             SUPPLEMENTAL INDENTURE

         THIS SUPPLEMENTAL INDENTURE, dated effective as of February 10, 1998,
is between DeGuelle Oil Company, a Colorado corporation as an Additional
Subsidiary Guarantor ("DOC"), and the Bank of New York, as Trustee.

                                    Recitals

         WHEREAS, effective August 26, 1997, Giant Industries, Inc. (the
"Company"), the Subsidiary Guarantors, and the Trustee, executed an Indenture
(the "Indenture") in the amount of $150,000,000 for the equal and ratable
benefit of the holders of the Company's 9% Senior Subordinated Notes due 2007.

         WHEREAS, Giant Industries Arizona, Inc., an Arizona corporation ("Giant
Arizona"), is a wholly-owned subsidiary of the Company and a signator of the
Indenture as a Subsidiary Guarantor.

         WHEREAS, DOC is a wholly-owned subsidiary of Giant Arizona.

         WHEREAS, DOC was acquired by Giant Arizona after the Issue Date.

         WHEREAS, in accordance with Section 11.03 of the Indenture, DOC desires
to execute and deliver a supplemental indenture pursuant to which DOC, as a
Restricted Subsidiary, shall guarantee the payment of the securities issued
pursuant to the Indenture.

         NOW, THEREFORE, the parties agree as follows:

                                    Agreement

         1. This Supplemental Indenture is being delivered pursuant to the
provisions of the Indenture and shall be construed and interpreted consistently
therewith. Capitalized terms used herein without definition shall have the
meaning ascribed to them in the Indenture.

         2. DOC acknowledges and agrees that it is subject to the provisions
(including the representations and warranties) of the Indenture as a Subsidiary
Guarantor.
<PAGE>
         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested, all as of the date first written above.

                                  ADDITIONAL SUBSIDIARY GUARANTOR

                                  DeGuelle Oil Company,
                                  as Subsidiary Guarantor

                                  By:      /s/ MARK B. COX
                                     -------------------------------------------
                                  Name:  Mark B. Cox
                                  Title:   Vice President and Financial Officer

                                  TRUSTEE

                                  The Bank of New York

                                  By:      /s/ WALTER N. GITLIN
                                     -------------------------------------------
                                  Name:    Walter N. Gitlin
                                  Title:   Vice President<PAGE>
                                                                     EXHIBIT 4.5

                             SUPPLEMENTAL INDENTURE

                                       to

                      Indenture dated as of August 26, 1997
                                for $150,000,000
                      9% Senior Subordinated Notes Due 2007

                                     between

                             GIANT PIPELINE COMPANY

                       as Additional Subsidiary Guarantor,

                                       and

                              The Bank of New York

                                   as Trustee

                     Dated effective as of December 1, 2000
<PAGE>
                             SUPPLEMENTAL INDENTURE

         THIS SUPPLEMENTAL INDENTURE, dated effective as of December 1, 2000, is
between Giant Pipeline Company, a New Mexico corporation as an Additional
Subsidiary Guarantor ("GPC"), and The Bank of New York, as Trustee.

                                    Recitals

         WHEREAS, effective August 26, 1997, Giant Industries, Inc. (the
"Company"), the Subsidiary Guarantors, and the Trustee, executed an Indenture
(the "Indenture") in the amount of $150,000,000 for the equal and ratable
benefit of the holders of the Company's 9% Senior Subordinated Notes due 2007.

         WHEREAS, Giant Industries Arizona, Inc., an Arizona corporation ("Giant
Arizona"), is a wholly-owned subsidiary of the Company and a signator of the
Indenture as a Subsidiary Guarantor.

         WHEREAS, GPC is a wholly-owned subsidiary of Giant Arizona.

         WHEREAS, GPC was formed by Giant Arizona after the Issue Date.

         WHEREAS, in accordance with Section 11.03 of the Indenture, GPC desires
to execute and deliver a supplemental indenture pursuant to which GPC, as a
Restricted Subsidiary, shall guarantee the payment of the securities issued
pursuant to the Indenture.

         NOW, THEREFORE, the parties agree as follows:

                                    Agreement

         1. This Supplemental Indenture is being delivered pursuant to the
provisions of the Indenture and shall be construed and interpreted consistently
therewith. Capitalized terms used herein without definition shall have the
meaning ascribed to them in the Indenture.

         2. GPC acknowledges and agrees that it is subject to the provisions
(including the representations and warranties) of the Indenture as a Subsidiary
Guarantor.
<PAGE>
         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested, all as of the date first written above.

                                 ADDITIONAL SUBSIDIARY GUARANTOR

                                 Giant Pipeline Company,
                                 as Subsidiary Guarantor

                                 By:      /s/ MARK B. COX
                                    --------------------------------------------
                                 Name:  Mark B. Cox
                                 Title:   Vice President and Financial Officer

                                 TRUSTEE

                                 The Bank of New York

                                 By:      /s/ WALTER N. GITLIN
                                    --------------------------------------------
                                 Name:    Walter N. Gitlin
                                 Title:   Vice President<PAGE>
                                                                     EXHIBIT 4.6

                             SUPPLEMENTAL INDENTURE

         SUPPLEMENTAL INDENTURE dated as of April 3, 2002, among Giant
Industries, Inc., a corporation duly organized and existing under the laws of
the State of Delaware (the "Company"), the Subsidiary Guarantors listed as
signatories hereto (the "Subsidiary Guarantors"), and The Bank of New York, a
banking corporation duly organized and existing under the laws of the State of
New York, as Trustee (the "Trustee").

         WHEREAS, the Company, the Subsidiary Guarantors and the Trustee have
heretofore executed and delivered an Indenture dated as of August 26, 1997, as
supplemented (the "Indenture"), providing for the issuance from time to time of
its 9% Senior Subordinated Notes due 2007;

         WHEREAS, Section 9.02 of the Indenture provides that the Company, the
Subsidiary Guarantors and the Trustee may amend the Indenture with the consent
of the Holders of at least a majority in principal amount of the then
outstanding Securities (such term and each other capitalized term used in this
First Supplemental Indenture and not defined herein having the meanings assigned
thereto in the Indenture);

         WHEREAS, the Company and the Subsidiary Guarantors desire to amend the
Indenture, as set forth in Article I hereof;

         WHEREAS, the Holders of at least a majority in aggregate principal
amount of the Securities outstanding have consented to the amendments effected
by this Supplemental Indenture; and

         WHEREAS, this Supplemental Indenture has been duly authorized by all
necessary corporate action on the part of the Company and the Subsidiary
Guarantors.

         NOW, THEREFORE, the Company, the Subsidiary Guarantors and the Trustee
agree as follows for the equal and ratable benefit of the Holders of the
Securities:

                                    ARTICLE I
                                    AMENDMENT

SECTION 1.01. Amendment to Section 1.01. The definition of "Restricted Payment"
in Section 1.01 of the Indenture is hereby amended by deleting clause (iii) of
said definition and adding in lieu thereof the following:

         "(iii) the making of any principal payment on, or the purchase,
         defeasance, repurchase, redemption or other acquisition or retirement
         for value, prior to any scheduled maturity, scheduled repayment or
         scheduled sinking fund payment, of any Indebtedness which is pari passu
         or subordinated in right of payment to the Securities, except that any
         such payment, purchase, defeasance, repurchase, redemption or other
         acquisition or
<PAGE>
         retirement for value of pari passu Indebtedness shall not constitute a
         Restricted Payment unless the Indebtedness, if any, incurred to
         refinance such pari passu Indebtedness is senior in right of payment to
         the Securities or has any scheduled principal payment prior to the
         maturity date of the Securities;"

                                   ARTICLE II
                                  MISCELLANEOUS

         SECTION 2.01. Interpretation; Severability; Headings. Upon the
execution and delivery of this Supplemental Indenture, the Indenture shall be
modified and amended in accordance with this Supplemental Indenture, and all the
terms and conditions of both shall be read together as though they constitute
one instrument, except that, in case of conflict, the provisions of this
Supplemental Indenture will control. The Indenture, as modified and amended by
this Supplemental Indenture, is hereby ratified and confirmed in all respects
and shall bind every Holder of Securities. In case of conflict between the terms
and conditions contained in the Securities and those contained in the Indenture,
as modified and amended by this Supplemental Indenture, the provisions of the
Indenture, as modified and amended by this Supplemental Indenture, shall
control. In case any provision in this Supplemental Indenture shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby. The
Article and Section headings of this Supplemental Indenture have been inserted
for convenience of reference only, are not to be considered a part hereof and
shall in no way modify or restrict any of the terms or provisions hereof.

         SECTION 2.02. Conflict with TIA. If any provision of this Supplemental
Indenture limits, qualifies or conflicts with any provision of the TIA that is
required under the TIA to be part of and govern any provision of this
Supplemental Indenture, the provision of the TIA shall control. If any provision
of this Supplemental Indenture modifies or excludes any provision of the TIA
that may be so modified or excluded, the provision of the TIA shall be deemed to
apply to the Indenture as so modified or to be excluded by this Supplemental
Indenture, as the case may be.

         SECTION 2.03. Successors; Benefits of Supplemental Indenture, etc. All
agreements of the Company and the Subsidiary Guarantors in this Supplemental
Indenture shall bind their respective successors. All agreements of the Trustee
in this Supplemental Indenture shall bind its successors. Nothing in this
Supplemental Indenture or the Securities, express or implied, shall give to any
Person, other than the parties hereto and thereto and their successors hereunder
and thereunder and the Holders of the Securities, any benefit of any legal or
equitable right, remedy or claim under the Indenture, this Supplemental
Indenture or the Securities.

         SECTION 2.04. Certain Duties and Responsibilities of the Trustee;
Trustee Not Responsible for Recitals. In entering into this Supplemental
Indenture, the Trustee shall be entitled to the benefit of every provision of
the Indenture relating to the conduct or affecting the liability or affording
protection to the Trustee, whether or not elsewhere herein so provided. The
Trustee shall not be responsible in any manner whatsoever for or in respect of
the validity or

                                       2
<PAGE>
sufficiency of this Supplemental Indenture or for or in respect of the recitals
contained herein, all of which recitals are made solely by the Company and the
Subsidiary Guarantors.

         SECTION 2.05. Governing Law. This Supplemental Indenture shall be
construed in accordance with the laws of the State of New York without reference
to its conflict of law provisions, and the obligations, rights and remedies of
the parties hereunder shall be determined in accordance with such laws.

         SECTION 2.06. Duplicate Originals. All parties may sign any number of
copies or counterparts of this Supplemental Indenture. Each signed copy or
counterpart shall be an original, but all of them together shall represent the
same agreement.

         IN WITNESS WHEREOF, each party hereto has caused this Supplemental
Indenture to be signed by its officer thereunto duly authorized as of the date
first written above.

                        GIANT INDUSTRIES, INC.,

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        THE BANK OF NEW YORK, as Trustee,

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        SUBSIDIARY GUARANTORS

                        Giant Industries Arizona, Inc., an Arizona corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        Ciniza Production Company, a New Mexico
                        corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                                       3
<PAGE>
                        Giant Stop-N-Go of New Mexico, Inc., a New Mexico
                        corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        Giant Four Corners, Inc., an Arizona corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        Phoenix Fuel Co., Inc., an Arizona corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        San Juan Refining Company, a New Mexico corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        Giant Mid-Continent, Inc., an Arizona corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                        Giant Pipeline Company, a New Mexico corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                                       4
<PAGE>
                        DeGuelle Oil Company, a Colorado corporation

                             By /s/
                                ------------------------------------
                                Name:
                                Title:

                                       5

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