Document:

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                                                                     Exhibit 4.5

                            Stock Option Agreement
                            ----------------------
                                 CONFIDENTIAL

  This Stock Option Agreement (the "Agreement") made effective as of the 3rd day
of February, 1999, by and between Syntroleum Corporation, a Kansas corporation
("Syntroleum") and W. John Hutton ("Grantee"), evidences the grant by Syntroleum
of an option (the "Option") to Grantee to purchase shares of Syntroleum common
stock, par value $0.01 per share ("Common Stock"), pursuant to action of the
Board of Directors on February 3, 1999 (the "Date of Grant") and Grantee's
acceptance of the Option in accordance with the provisions of the Syntroleum
1993 Stock Option and Incentive Plan (the "Plan"). Syntroleum and Grantee agree
as follows.

  1.   Grant of Option and Exercise Price.  Syntroleum grants to Grantee the
       ----------------------------------
Option to purchase 8,000 shares of Common Stock at an exercise price of $6.88
per share, the Fair Market Value (as defined in the Plan) of Syntroleum Common
Stock on the Date of Grant, subject to the terms and conditions of this
Agreement and of the Plan, the provisions of which are incorporated into this
Agreement by this reference.  The shares subject to the Option are intended to
be Incentive Stock Option (ISO) shares as described in Section 422(b) of the
Internal Revenue Code of 1986, as amended.

  2.   Vesting.  Except as otherwise provided in Section 3 of this Agreement or
       -------                                   ---------
in the Plan, the Option shall vest as follows:  (a) the right to exercise the
Option and purchase 2,667 shares shall vest on the first annual anniversary of
the Date of Grant, (b) the right to exercise the Option and purchase 2,667
shares shall vest on the second annual anniversary of the Date of Grant, and (c)
the right to exercise the Option and purchase the remaining 2,666 shares shall
vest on the third annual anniversary of the Date of Grant.

  3.   Exercise Period.  The Option may be exercised from time to time with
       ---------------
respect to all or any number of the then vested, unexercised shares on any
regular business day of Syntroleum at its then executive offices, until the
earliest to occur of the following dates:  (a) the tenth anniversary of the Date
of Grant; (b) 12 months after the date of Grantee's termination of employment
with Syntroleum by reason of death or disability; (c) the third annual
anniversary of Grantee's retirement; or (d) the date 30 days following the date
upon which Grantee's employment with Syntroleum terminates for any reason other
than those described in subsections (b) or (c) of this Section 3.
                                                       ---------

  4.   Exercise.
       --------

  4.01 During the period that the Option is exercisable, it may be exercised in
full or in part by Grantee or, in the event or Grantee's death, by the person or
persons to whom the Option was transferred by will or the laws of decent and
distribution, by delivering or mailing written notice of the exercise to the
Secretary of Syntroleum.  The written notice shall be signed by each person
entitled to exercise the Option and shall specify the address and Social
Security number of each such person.  If any person other than Grantee purports
to be entitled to exercise all or any portion of the Option, the written notice
shall be accompanied by proof, satisfactory to Syntroleum, of that entitlement.

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

  4.02  Subject to the provisions of Section 4.04 and 4.05, the written notice
                                     ------------     ----
shall be accompanied by full payment of the exercise price for the shares as to
which the Option is exercised either (i) in cash, (ii) in shares of Common Stock
evidenced by certificates either endorsed or with stock powers attached
transferring ownership to Syntroleum, with the aggregate Fair Market Value (as
defined in the Plan) equal to said exercise price on the date the written notice
is received by the Secretary, or (iii) in any combination of cash and such
shares.

  4.03  Notwithstanding the provisions of Section 4.02, shares acquired through
                                          ------------
the exercise of an ISO granted under the Plan may be used as payment at exercise
under this Agreement only if such shares have been held for at least 12 months
following such acquisition.

  4.04  In lieu of payment of the exercise price by way of delivery of
certificate(s) evidencing shares of Common Stock, Grantee may furnish a
notarized statement reciting the number of shares being purchased under the
Option and the number of Syntroleum shares owned by Grantee which may be freely
delivered as payment of all or a portion of the exercise price, all pursuant to
rules adopted by and subject to the consent of the Committee.  Subject to the
consent of the Committee, Grantee will be issued a certificate for new shares of
Common Stock representing the number of shares as to which the Option is
exercised, less the number of shares described in the notarized statement as
constituting payment under the Option.

  4.05  In the event Grantee pays the Option exercise price by delivery of a
notarized statement of ownership or by surrendering his right to exercise a
portion of the Option as described in Sections 4.04 and 4.05, the number of
                                      -------------     ----
shares remaining subject to the Option shall be reduced not only by the number
of new shares issued upon exercise of the Option but also by the number of
previously owned shares listed on the notarized statement of ownership and
deemed to be surrendered as payment of the exercise price or, as applicable, by
the number of shares in connection with which Grantee has surrendered his right
to exercise the Option.

  4.06  The written notice of exercise will be effective and the Option shall be
deemed exercised to the extent specified in the notice on the date that the
written notice (together with required payment of the exercise price) is
received by the Secretary of Syntroleum at its executive offices during regular
business hours.

  5.    Transfer of Shares; Tax Withholding. As soon as practicable after
        -----------------------------------
receipt of an effective written notice of exercise and full payment of the
exercise price as provided in Section 4 above, the Secretary of Syntroleum shall
                              ---------
cause ownership of the appropriate number of shares of Syntroleum Common Stock
to be issued to the person or persons exercising the Option by having a
certificate or certificates for such number of shares registered in the name of
such person or persons and shall have each certificate delivered to the
appropriate person. Each such certificate shall bear a legend describing, to the
extent applicable, (a) Syntroleum's right of first refusal, if any, in the event
such person desires or attempts to transfer such shares, and (b) the
restrictions imposed by applicable state and federal securities laws, as
described in Section 6.03. Notwithstanding the foregoing, if Syntroleum
             ------------
requires reimbursement of any tax required by law to be withheld with respect to
shares of Syntroleum Common Stock, the Secretary shall not transfer ownership of
shares until the required payment is made.

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

  6.    Miscellaneous.
        -------------

  6.01  The rights under this Agreement may not be transferred except by will or
the laws of descent and distribution.  The rights under this Agreement may be
exercised during the lifetime of Grantee only by Grantee (or by his guardian or
legal representative).  The terms of the Option shall be binding upon the
executors, administrators, heirs, successors, and assigns of Grantee.

  6.02  Authorized leaves of absence from Syntroleum shall not constitute a
termination of employment for purposes of this Agreement.  For purposes of this
Agreement, an authorized leave of absence shall be an absence while Grantee is
on military leave, sick leave, or other bona fide leave of absence so long as
Grantee's right to employment with Syntroleum is guaranteed by statute,
contract, or company policy.

  6.03  The Option may not be exercised if the issuance of shares of
Syntroleum's Common Stock upon such exercise of the Option would constitute a
violation of any applicable federal or state securities or other law or
regulation.

  6.04  Grantee shall have no rights as a stockholder with respect to any shares
covered by the Option until the date of the actual issuance of the shares.  No
adjustment shall be made for dividends (ordinary or extraordinary, whether in
cash, securities or other property) or distributions or other rights for which
the record date is prior to the date the shares or any part thereof are issued
pursuant to exercise of all or any part of the Option.

  6.05  Grantee agrees not to disclose to any person, directly or indirectly,
the terms of this Agreement or any other matters relating to the Option or the
shares, including the number of shares subject to the Option or purchased
hereunder, without the prior consent of Syntroleum.

  6.06  The existence of the Option granted in this Agreement shall not affect
in any way the right or the power of Syntroleum or its stockholders to make or
authorize any or all adjustments, recapitalizations, reorganizations or other
changes in Syntroleum's capital structure or its business, or any merger or
consolidation of Syntroleum, or any issue of bonds, debentures, preferred or
prior preference stocks ahead of or affecting the Common Stock or the rights
thereof, or the dissolution or liquidation of Syntroleum or any sale or transfer
of all or any part of its assets or business, or any other corporate act or
preceding, whether of a similar character or otherwise.

  6.07  Every notice or other communication relating to this Agreement shall be
in writing and shall be mailed to or delivered to the party for whom it is
intended at such address as may from time to time be designated by it in a
notice mailed or delivered to the other party as herein provided, however, that
unless and until some other address be so designated, all notices or
communications by Grantee to Syntroleum shall be mailed or delivered to
Syntroleum at the offices of its Secretary at Suite 1100, 1350 S. Boulder,
Tulsa, Oklahoma 74119, and all notice or communications by Syntroleum to Grantee
may be given to Grantee personally or may be mailed to him.

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

  6.08  The validity and effect of this Agreement and the rights and obligations
of the parties, and all other persons affected by this Agreement shall be
construed and determined in accordance with the laws of the State of Oklahoma.

  IN WITNESS WHEREOF, Syntroleum, by its duly authorized officer, and Grantee
have signed this Agreement as of the date first above written.

                                    COMPANY:

                                    SYNTROLEUM CORPORATION

                                By: /s/ MARK A. AGEE
                                    ____________________________
                                    Mark A. Agee, President

                                    Syntroleum Corporation.
                                    1350 S. Boulder, Ste. 1100
                                    Tulsa, Oklahoma 74119

                                    GRANTEE:

                                    /s/ W. JOHN HUTTON
                                    ____________________________
                                    W. John Hutton

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                                                                     Exhibit 4.6

                      Syntroleum - Stock Option Agreement
--------------------------------------------------------------------------------
                                 CONFIDENTIAL

                            Stock Option Agreement
                            ----------------------
                                 CONFIDENTIAL

     This Stock Option Agreement (the "Agreement") is made effective as of the
1/st/ day of January, 2000, by and between Syntroleum Corporation, a Delaware
corporation (the "Company") and Peter Prentice ("Grantee")

     WHEREAS, Grantee has agreed to provide consulting services as project
manager to a subsidiary of the Company which is engaged in a project (the
"Project") to design, construct and operate a commercial plant to be located on
the Burrup Peninsula in Western Australia to produce various specialty
hydrocarbon products from natural gas using the Company's proprietary gas-to-
liquids technology; and

     WHEREAS, as on incentive to Grantee to use his best efforts to complete the
Project, the Company's Board of Directors has approved the grant to grantee of
options to purchase 20,000 shares of the Company's common stock, par value $0.01
per share ("Common Stock") on the terms set forth in this Agreement.

     NOW THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the Company and Grantee agree as follows.

     1.  Grant of option and Exercise Price. The Company grants to Grantee the
         ----------------------------------
option (the "Option") to purchase 20,000 shares of Common Stock at an exercise
price of 8.13, the fair market value of the Company's common Stock on the date
of this Agreement.

     2.  Exercise Period.  The Option may be exercised from time to time with
         ---------------
respect to all or any number of the then unexercised shares on any regular
business day of the Company at its then executive offices, beginning on the date
of the successful completion by the Project of the performance and function
tests (the "Completion Date") in accordance with the provisions of that certain
Project Development Agreement between Syntroleum Sweetwater Operations Ltd.
("Syntroleum Sweetwater") and Klockner Industrie-Anlagen GmbH dated November 11,
1999 and any succeeding agreement relating to the engineering, procurement and
construction of the Project and continuing until the fifth annual anniversary of
the Completion Date.  In the event that certain Consulting Agreement between
Grantee and Syntroleum Sweetwater dated effective as of January 1, 2000, (the
"Consulting Agreement") is  (a) terminated by either party to that agreement for
any reason at any time prior to a date which is 180 days before the Completion
Date, or (b) terminated by Syntroleum Sweetwater for cause at any time after a
date which is 180 days before the Completion Date, then, in either event, the
Option shall terminate and be of no further force or effect.  As used in this
Section 2., "for cause" means (i) Grantee's material breach of his obligations,
duties and responsibilities under any term or provision of the Consulting

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

Agreement, which breach remains uncured for a period of five days after written
notice by Syntroleum Sweetwater to Grantee; (ii) Grantee's failure to adhere to
the reasonable standards of performance under the Consulting Agreement as
prescribed by Syntroleum Sweetwater; (iii) Grantee's gross negligence or
willfull misconduct in the performance of his duties under the Consulting
Agreement; (iv) Grantee's dishonesty, fraud, misappropriation or embezzlement in
the course of, related to, or connected with the business of Syntroleum
Sweetwater; or (v) Grantee's conviction of a felony.

  3.    Exercise.
        --------

  3.01  Person Eligible to Exercise.  During the lifetime of Grantee, only the
        ---------------------------
Grantee may exercise the Option (or any portion thereof).  After the death of
Grantee, any exercisable portion of the Option may, prior to the time when such
portion becomes unexercisable under the Plan or this Agreement, be exercised by
Grantee's personal representative or by any person empowered to do so under
Grantee's will or under the then applicable laws of descent and distribution.

  3.02  Partial Exercise.  At any time and from time to time during the period
        ----------------
in which the Option is exercisable under this Agreement and prior to the time
when the Option or exercisable portion thereof becomes unexercisable under this
Agreement, the Option or portion thereof may be exercised in whole or in part;
provided, however, that the Company shall not be required to issue fractional
shares and any partial exercise of the Option shall be with respect to not less
than 100 shares (or such lesser remaining number of shares subject to the
Option).

  3.03  Manner of Exercise.  At any time and from time to time during the period
        ------------------
in  which the Option is exercisable under this Agreement, the Option, or any
exercisable portion thereof, may be exercised solely by delivery to the
Secretary of the Company of all of the following prior to the time when the
Option or such portion becomes unexercisable under this Agreement:

        (a)  notice in writing signed by Grantee or other person then entitled
     to exercise the Option or portion, stating that the Option or portion is
     exercised, such notice complying with all applicable rules established by
     the Chief Financial Officer of the Company;

        (b)  full payment (in cash or by check) for the shares with respect to
     which the Option or portion is thereby exercised,

        (c)  the payment to the Company of all amounts, if any, which it is
     required to withhold under federal, state or local law in connection with
     the exercise of the Option;

        (d)  such representations and documents as the Chief Financial Officer
     of the Company deems necessary or advisable to effect compliance with all
     applicable

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

     provisions of federal or state securities laws or regulations. The Chief
     Financial Officer of the Company may also take whatever additional actions
     he deems appropriate to effect such compliance including, without
     limitation, placing legends on share certificates and issuing stop-transfer
     orders to transfer agents and registrars; and

        (e)  in the event that the Option or portion thereof shall be exercised
     pursuant to Section 3.01 by any person or persons other than Grantee,
                 ------------
     appropriate proof of the right of such person or persons to exercise the
     Option or portion thereof.

     3.04  Conditions to Issuance of Stock Certificates.  The shares of Common
           --------------------------------------------
Stock issuable and deliverable to Grantee upon the exercise of the Option, or
any portion thereof, may be either previously authorized but unissued shares or
issued shares of Common Stock which have then been reacquired by the Company.
The Company shall not be required to issue or deliver any certificate or
certificates for shares of Common stock purchased upon the exercise of any
Option nor portion thereof prior to fulfillment of all of the following
conditions:

           (a)  the admission of such shares to listing on all stock exchanges
     on which such class of stock is then listed;

           (b)  the completion of any registration or other qualification of
     such shares under any state or federal law or under the filings or
     regulations of the Securities and Exchange Commission or any other federal
     or state governmental regulatory body, which the Chief Financial Officer of
     the Company shall determine to be necessary or advisable;

           (c)  the obtaining of any approval or other clearance from any state
     or federal governmental agency which the Chief Financial Officer of the
     Company shall determine to be necessary or advisable;

           (d)  the payment to the Company (or other employer corporation) of
     all taxes and other amounts which it is required to withhold under federal,
     state or local law in connection with the exercise of the Option; and

           (e)  the lapse of such reasonable period of time following the
     exercise of the Option as the Chief Financial Officer of the Company may
     establish from time to time for reasons of administrative convenience.

     3.05  Issuance of Shares.  As soon as practicable after receipt of an
           ------------------
effective written notice of exercise and full payment of the exercise price as
provided in this Section 3 above, the Secretary of the Company shall cause
                 ---------
ownership of the appropriate number of shares of Common Stock to be issued to
the person or persons exercising the Option by having a certificate or
certificates for such number of shares registered in the name of such person or
persons and shall have each certificate delivered to the appropriate person.
Each

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

such certificate shall bear a legend describing the restrictions imposed by
applicable state and federal securities laws, as described in Section 5.03, to
                                                              ------------
the extent applicable.

  3.06  Rights as a Shareholder.  Grantee shall not be, nor have any of the
        -----------------------
rights or privileges of a shareholder of the Company in respect to any shares of
Common Stock purchasable upon the exercise of any part of the Option unless and
until certificates representing such shares of Common Stock have been issued by
the Company to Grantee.

  4.    Miscellaneous.
        -------------

  4.01  Assignment.  Neither the Option nor any interest or right therein or
        ----------
part thereof nor any rights under this Agreement shall be liable for the debts,
contracts or engagements of Grantee or his successors in interest or shall be
assigned or otherwise subject to disposition by transfer, alienation,
anticipation, pledge, encumbrance, assignment or any other means whether such
disposition be voluntary or involuntary or by operation of law by judgment,
levy, attachment, garnishment or any other legal or equitable proceedings
(including bankruptcy), and any attempted assignment or disposition thereof
shall be null and void and of no effect; provided, however, that nothing in this
Section 4.01 shall prevent transfers by will or by the applicable laws of
------------
descent and distribution. The terms of this Option shall be binding upon the
executors, administrators, heirs, successors, and permitted assigns of Grantee.

  4.02  Federal and State Securities Laws.  This Option may not be exercised
        ---------------------------------
if the issuance of shares of the Company's Common Stock upon such exercise would
constitute a violation of any applicable federal or state securities or other
law or valid regulation.  Grantee, as a condition to his exercise of this
Option, shall represent to the Company that the shares of the Company's Common
Stock to be acquired by exercise of this Option are being acquired for
investment and not with a present view to distribution or resale, unless counsel
for the Company is then of the opinion that such a representation is not
required under the Securities Act or any other applicable law, regulation, or
rule of any governmental agency.

  4.03  Confidentiality.  Grantee agrees not to disclose to any person, directly
        ---------------
or indirectly, the terms of this Agreement or any other matters relating to the
Option or the shares, including the number of shares subject to the Option or
purchased hereunder, without the prior consent of the Company.

  4.04  Sole Party in Interest.  Grantee is the sole party in interest with
        ----------------------
respect to the grant of the Option and issuance of the underlying shares of
Common Stock and has sufficient knowledge and experience in financial and
business matters to enable him to evaluate the merits and risks of this
investment.

  4.05  Speculative Investment.  Grantee recognizes the speculative nature and
        ----------------------
the high risk of loss associated with the grant of the Option and issuance of
the underlying shares of Common Stock of Common Stock and affirms that the
transaction is suitable and

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

consistent with Grantee's investment program and financial situation, which
enables Grantee to bear the high risk of this investment.

  4.06  Reorganization; Recapitalization.  The existence of the Option granted
        --------------------------------
in this Agreement shall not affect in any way the right or the power of the
Company or its shareholders to make or authorize any or all adjustments,
recapitalizations, reorganizations or other changes in the Company's capital
structure or its business, or any merger or consolidation of the Company, or any
issue of bonds, debentures, preferred or prior preference stocks ahead of or
affecting the Common Stock or the rights thereof, or the dissolution or
liquidation of the Company or any sale or transfer of all or any part of its
assets or business, or any other corporate act or preceding, whether of a
similar character or otherwise.

  4.07  Notice.  Every notice or other communication relating to this Agreement
        ------
shall be in writing and shall be mailed to or delivered to the party for whom it
is intended at such address as may from time to time be designated by it in a
notice mailed or delivered to the other party as herein provided, however, that
unless and until some other address be so designated, all notices or
communications by Grantee to the Company shall be mailed or delivered to the
Company at the offices of its Secretary at Suite 1100, 1350 S. Boulder, Tulsa,
Oklahoma 74119, and all notice or communications by the Company to Grantee may
be given to Grantee personally or may be mailed to him.

  4.08  Governing Law.  The validity and effect of this Agreement and the rights
        -------------
and obligations of the parties, and all other persons affected by this Agreement
shall be construed and determined in accordance with the laws of the State of
Delaware.

  IN WITNESS WHEREOF, the Company, by its duly authorized officer, and Grantee
have signed this Agreement as of the date first above written.

                                    COMPANY:

                                    SYNTROLEUM CORPORATION

                               By:  /s/ KENNETH L. AGEE
                                    _______________________________
                                    Kenneth L. Agee, Chairman & CEO

                                    Syntroleum Corporation.
                                    Suite 1100
                                    1350 S. Boulder
                                    Tulsa, Oklahoma  74119

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                      Syntroleum - Stock Option Agreement
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                                 CONFIDENTIAL

                               GRANTEE:

                               By:  /s/ PETER PRENTICE
                                    ______________________________
                                    Peter Prentice

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