<PAGE>

                                                                    EXHIBIT 4.18
                          REGISTRATION RIGHTS AGREEMENT

      THIS REGISTRATION RIGHTS AGREEMENT (the "Agreement") is made and entered
into as of September 27, 2005 by and between Toreador Resources Corporation, a
Delaware corporation (the "Company") and UBS Securities LLC and the other
Initial Purchasers named in the Purchase Agreement referred to below
(collectively, the "Initial Purchasers"), for whom UBS Securities LLC is acting
as representative, pursuant to that certain Purchase Agreement, dated as of
September 22, 2005 (the "Purchase Agreement") between the Company and the
Initial Purchasers.

      In order to induce the Initial Purchasers to enter into the Purchase
Agreement, the Company has agreed to provide the registration rights set forth
in this Agreement. The execution of this Agreement is a condition to the closing
under the Purchase Agreement.

      The Company agrees with the Initial Purchasers (i) for their benefit as
Initial Purchasers and (ii) for the benefit of the beneficial owners (including
the Initial Purchasers) from time to time of the Notes (as defined herein) and
the beneficial owners from time to time of the Underlying Common Stock (as
defined herein) issuable or issued upon conversion of the Notes (each of the
foregoing a "Holder" and together the "Holders"), as follows:

      Section 1. Definitions. Capitalized terms used herein without definition
shall have their respective meanings set forth in the Purchase Agreement. As
used in this Agreement, the following terms shall have the following meanings:

      "Affiliate" means with respect to any specified person, an "affiliate," as
defined in Rule 144, of such person.

      "Applicable Conversion Price" means, as of any date of determination,
$1,000 divided by the Conversion Rate then in effect as of the date of
determination or, if no Notes are then outstanding, the Conversion Rate that
would be in effect were Notes then outstanding.

      "Business Day" means each day on which the NASDAQ National Market is open
for trading.

      "Common Stock" means the shares of common stock, par value $0.15625 per
share, of the Company and any other shares of capital stock as may constitute
"Common Stock" for purposes of the Indenture, including the Underlying Common
Stock.

      "Conversion Rate" has the meaning assigned to such term in the Indenture.

      "Damages Accrual Period" has the meaning set forth in Section 2(e) hereof.

                                       1
<PAGE>

      "Damages Payment Date" means each interest payment date under the
Indenture in the case of Notes.

      "Effectiveness Deadline Date" has the meaning set forth in Section 2(a)
hereof.

      "Effectiveness Period" means a period of time (subject to extension
pursuant to Section 3(i) hereof) that will terminate when each of the
Registrable Securities covered by the Shelf Registration Statement ceases to be
a Registrable Security.

      "Event" has the meaning set forth in Section 2(e) hereof.

      "Event Date" has the meaning set forth in Section 2(e) hereof.

      "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations of the SEC promulgated thereunder.

      "Filing Deadline Date" has the meaning set forth in Section 2(a) hereof.

      "Holder" has the meaning set forth in the third paragraph of this
Agreement.

      "Indenture" means the Indenture, dated as of September 27, 2005 between
the Company and The Bank of New York Trust Company, N.A., as trustee, pursuant
to which the Notes are being issued.

      "Initial Purchasers" has the meaning set forth in the preamble hereto.

      "Initial Shelf Registration Statement" has the meaning set forth in
Section 2(a) hereof.

      "Issue Date" means the first date of original issuance of the Notes.

      "Liquidated Damages Amount" has the meaning set forth in Section 2(e)
hereof.

      "Material Event" has the meaning set forth in Section 3(i) hereof.

      "Notes" means the 5.00% Convertible Senior Notes due 2025 of the Company
to be purchased pursuant to the Purchase Agreement.

      "Notice and Questionnaire" means a written notice and questionnaire
delivered to the Company containing substantially the information called for by
the Selling Securityholder Notice and Questionnaire attached as Annex A to the
Offering Memorandum dated September 22, 2005 relating to the Notes.

      "Notice Holder" means, on any date, any Holder that has delivered a Notice
and Questionnaire to the Company on or prior to such date, so long as all

                                       2
<PAGE>

of their Registrable Securities that have been registered for resale pursuant to
a Notice and Questionnaire have not been sold in accordance with a Shelf
Registration Statement.

      "Purchase Agreement" has the meaning set forth in the preamble hereof.

      "Prospectus" means the prospectus included in any Shelf Registration
Statement (including, without limitation, a prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 415 promulgated under the
Securities Act), as amended or supplemented by any amendment or prospectus
supplement, including post-effective amendments, and all materials incorporated
by reference or explicitly deemed to be incorporated by reference in such
Prospectus.

      "Record Holder" means with respect to any Damages Payment Date relating to
any Notes as to which any such Liquidated Damages Amount has accrued, the holder
of record of such Note on the record date with respect to the interest payment
date under the Indenture on which such Damages Payment Date shall occur.

      "Registrable Securities" means the Notes until such Notes have been
converted into the Underlying Common Stock and at all times the Underlying
Common Stock and any securities into or for which such Underlying Common Stock
has been converted, and any security issued with respect thereto upon any stock
dividend, split or similar event until, in the case of any such security, the
earliest of (x) the date on which such security has been effectively registered
under the Securities Act and disposed of in accordance with the Shelf
Registration Statement and (y) the date on which such security is eligible for
sale pursuant to Rule 144(k) under the Securities Act or any successor
provisions thereunder.

      "Registration Expenses" has the meaning set forth in Section 5 hereof.

      "Registration Statement" means any registration statement of the Company
that covers any of the Registrable Securities pursuant to the provisions of this
Agreement including the Prospectus, amendments and supplements to such
registration statement, including post-effective amendments, all exhibits, and
all materials incorporated by reference or explicitly deemed to be incorporated
by reference in such registration statement.

      "Rule 144" means Rule 144 under the Securities Act, as such Rule may be
amended from time to time, or any similar rule or regulation hereafter adopted
by the SEC.

      "Rule 144A" means Rule 144A under the Securities Act, as such Rule may be
amended from time to time, or any similar rule or regulation hereafter adopted
by the SEC.

      "SEC" means the Securities and Exchange Commission.

                                       3
<PAGE>

      "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated by the SEC thereunder.

      "Shelf Registration Statement" has the meaning set forth in Section 2(a)
hereof.

      "Subsequent Shelf Registration Statement" has the meaning set forth in
Section 2(b) hereof.

      "Suspension Notice" has the meaning set forth in Section 3(i) hereof.

      "Suspension Period" has the meaning set forth in Section 3(i) hereof.

      "TIA" means the Trust Indenture Act of 1939, as amended.

      "Trustee" means The Bank of New York Trust Company, N.A., the Trustee
under the Indenture.

      "Underlying Common Stock" means the Common Stock into which the Notes are
convertible or issued upon any such conversion.

      Section 2. Shelf Registration. (a) The Company shall prepare and file or
cause to be prepared and filed with the SEC, as soon as practicable but in any
event by the date (the "Filing Deadline Date") that is ninety (90) days after
the Issue Date, a Registration Statement for an offering to be made on a delayed
or continuous basis pursuant to Rule 415 of the Securities Act (a "Shelf
Registration Statement") registering the resale from time to time by Holders
thereof of all of the Registrable Securities (the "Initial Shelf Registration
Statement"). The Initial Shelf Registration Statement shall be on Form S-1 or
S-3 or another appropriate form permitting registration of such Registrable
Securities for resale by such Holders in accordance with the reasonable methods
of distribution elected by the Holders, approved by the Company, and set forth
in the Initial Shelf Registration Statement. The Company shall use its
reasonable best efforts to cause the Initial Shelf Registration Statement to be
declared effective under the Securities Act as promptly as is practicable but in
any event by the date (the "Effectiveness Deadline Date") that is one hundred
eighty (180) days after the Issue Date, and to keep the Initial Shelf
Registration Statement (or any Subsequent Shelf Registration Statement)
continuously effective under the Securities Act until the expiration of the
Effectiveness Period. At the time the Initial Shelf Registration Statement is
declared effective, each Holder that became a Notice Holder on or prior to the
date that is five (5) Business Days prior to such time of effectiveness shall be
named as a selling securityholder in the Initial Shelf Registration Statement
and the related Prospectus in such a manner as to permit such Holder to deliver
such Prospectus to purchasers of Registrable Securities in accordance with
applicable law. The Company shall be deemed not to have used its reasonable best
efforts to cause the Shelf Registration Statement to be declared effective under
the Securities Act and to keep the Initial Shelf Registration Statement
continuously effective under the Securities Act during the requisite period if
it

                                        4
<PAGE>

voluntarily takes any action that would result in the Holders not being able to
offer and sell the Registrable Securities during that period, unless (i) such
action is required by applicable law, or (ii) such action is taken by the
Company in good faith and for valid business reasons (not including avoidance of
the Company's obligations hereunder), including, but not limited to, the
acquisition or divestiture of assets, so long as the Company promptly thereafter
complies with the requirements of Section 2(c) hereof, if applicable.

      (b) If the Initial Shelf Registration Statement or any Subsequent Shelf
Registration Statement ceases to be effective for any reason at any time during
the Effectiveness Period, the Company shall use its reasonable best efforts to
obtain the prompt withdrawal of any order suspending the effectiveness thereof,
and in any event shall within ten (10) days of such cessation of effectiveness
amend the Shelf Registration Statement in a manner reasonably expected to obtain
the withdrawal of the order suspending the effectiveness thereof, or file an
additional Shelf Registration Statement covering all of the securities that as
of the date of such filing are Registrable Securities (a "Subsequent Shelf
Registration Statement"). If a Subsequent Shelf Registration Statement is filed,
the Company shall use its reasonable best efforts to cause the Subsequent Shelf
Registration Statement to become effective as promptly as is practicable after
such filing and to keep such Shelf Registration Statement (or subsequent Shelf
Registration Statement) continuously effective until the end of the
Effectiveness Period.

      (c) The Company shall, as promptly as practicable, supplement and amend
the Shelf Registration Statement if required by the rules, regulations or
instructions applicable to the registration form used by the Company for such
Shelf Registration Statement, if required by the Securities Act or as reasonably
requested by the Initial Purchasers or by the Trustee on behalf of the Holders
of the Registrable Securities covered by such Shelf Registration Statement.

      (d) Each Holder of Registrable Securities agrees that if such Holder
wishes to sell Registrable Securities pursuant to a Shelf Registration Statement
and related Prospectus, it will do so only in accordance with this Section 2(d)
and Section 3(i). Each Holder of Registrable Securities wishing to sell
Registrable Securities pursuant to a Shelf Registration Statement and related
Prospectus agrees to deliver a completed and executed Notice and Questionnaire
to the Company prior to any attempted or actual distribution of Registrable
Securities under the Shelf Registration Statement; provided that Holders of
Registrable Securities shall have at least twenty (20) Business Days from the
date on which the Notice and Questionnaire is first sent to such Holders by the
Company to complete and return the Notice and Questionnaire to the Company. From
and after the date that is five (5) Business Days prior to date the the Initial
Shelf Registration Statement is declared effective, the Company shall, as
promptly as practicable after the date a Notice and Questionnaire is delivered,
and in any event within the later of (x) ten (10) Business Days after such date
or (y) ten (10) Business Days after the expiration of any Suspension Period (1)
in effect when the Notice and Questionnaire is delivered or (2) put into effect
within ten (10)

                                       5
<PAGE>

Business Days of such delivery date, (i) if required by applicable law, file
with the SEC a post-effective amendment to the Shelf Registration Statement or,
if required by applicable law, prepare and file a supplement to the related
Prospectus or a supplement or amendment to any document incorporated therein by
reference or file any other required document so that the Holder delivering such
Notice and Questionnaire is named as a selling securityholder in the Shelf
Registration Statement and the related Prospectus in such a manner as to permit
such Holder to deliver such Prospectus to purchasers of the Registrable
Securities in accordance with applicable law and, if the Company shall file a
post-effective amendment to the Shelf Registration Statement, use its reasonable
best efforts to cause such post-effective amendment to be declared effective
under the Securities Act as promptly as is practicable, but in any event by the
date that is forty-five (45) days after the date such post-effective amendment
is required by this clause to be filed; (ii) provide such Holder a reasonable
number of copies of any documents filed pursuant to Section 2(d)(i); and (iii)
notify such Holder as promptly as practicable after the effectiveness under the
Securities Act of any post-effective amendment filed pursuant to Section
2(d)(i); provided that if such Notice and Questionnaire is delivered during a
Suspension Period, or a Suspension Period is put into effect within ten (10)
Business Days after such delivery date, the Company shall so inform the Holder
delivering such Notice and Questionnaire and shall take the actions set forth in
clauses (i), (ii) and (iii) above within ten (10) Business Days after expiration
of the Suspension Period in accordance with Section 3(i); provided further that
if under applicable law, the Company has more than one option as to the type or
manner of making any such filing, the Company shall make the required filing or
filings in the manner or of a type that is reasonably expected to result in the
earliest availability of the Prospectus for effecting resales of Registrable
Securities. Notwithstanding anything contained herein to the contrary, the
Company shall be under no obligation to file more than three post-effective
amendments or Prospectus supplements pursuant to this Section 2(d) during any
fiscal quarter or to name any Holder that is not a Notice Holder as a selling
securityholder in any Shelf Registration Statement or related Prospectus;
provided, however, that any Holder that becomes a Notice Holder pursuant to the
provisions of this Section 2(d) (whether or not such Holder was a Notice Holder
at the time the Shelf Registration Statement was declared effective) shall be
named as a selling securityholder in the Shelf Registration Statement or related
Prospectus in accordance with the requirements of this Section 2(d).

      (e) The parties hereto agree that the Holders of Registrable Securities
will suffer damages, and that it would not be feasible to ascertain the extent
of such damages with precision, if (i) the Initial Shelf Registration Statement
has not been filed on or prior to the Filing Deadline Date, (ii) the Initial
Shelf Registration Statement has not been declared effective under the
Securities Act on or prior to the Effectiveness Deadline Date, (iii) a Holder
delivers a Notice and Questionnaire after the date that is five (5) Business
Days prior to the date the Initial Registration Statement is declared effective
and the Company fails to comply with its obligations under Section 2(d), (iv)
the Initial Shelf Registration

                                       6
<PAGE>

Statement is filed and declared effective but shall thereafter cease to be
effective (without being succeeded immediately by an additional registration
statement that is filed and immediately becomes effective) or usable for the
offer and sale of Registrable Securities, other than as a result of a
requirement to file a post-effective amendment or prospectus supplement in order
to make changes to the information in the Prospectus regarding the selling
securityholders or the plan of distribution, and (1) the Company does not cure
the lapse of effectiveness or usability of the Shelf Registration Statement
within ten (10) Business Days (or if a Suspension Period is then in effect,
within ten (10) Business Days following the expiration of such Suspension
Period) by a post-effective amendment, prospectus supplement or report filed
under the Exchange Act, or (2) if applicable, the Company does not terminate the
Suspension Period by the end of the 45 or 90 day periods referred to in Section
3(i), or (3) Suspension Periods exceed an aggregate of 90 days in any 360-day
period, or (v) the Company fails to name a selling securityholder, in a Shelf
Registration Statement or any amendment to a Shelf Registration Statement, at
the time it becomes effective under the Securities Act, or in any Prospectus, at
the time the Company files the Prospectus or, if later, the time the related
Shelf Registration Statement or amendment becomes effective under the Securities
Act, any Holder that is entitled to be so named as a selling securityholder
(each of the events of a type described in any of the foregoing clauses (i)
through (v) are individually referred to herein as an "Event," and the Filing
Deadline Date in the case of clause (i), the Effectiveness Deadline Date in the
case of clause (ii), the date on which the Company has failed to comply with its
obligations under Section 2(d) in the case of clause (iii), the expiration of
such the ten Business Day period in the case of clause (iv)(1) or the date on
which the applicable Suspension Period exceeds the number of permitted days in
the case of clause (iv)(2) or (iv)(3), and the date of effectiveness of the
Shelf Registration Statement or amendment or filing of the Prospectus, as
applicable, in the case of clause (v), being referred to herein as an "Event
Date"). Events shall be deemed to continue until the following dates with
respect to the respective types of Events: the date the Initial Shelf
Registration Statement is filed in the case of an Event of the type described in
clause (i), the date the Initial Shelf Registration Statement is declared
effective under the Securities Act in the case of an Event of the type described
in clause (ii), the date the Holder is named as a selling securityholder in
accordance with the terms hereof in the case of an Event of the type described
in clause (iii) or clause (v), and the date the Initial Shelf Registration
Statement becomes effective or usable again or the applicable Suspension Period
terminates in the case of an Event of the type described in clause (iv).

      Accordingly, commencing on (and including) any Event Date and ending on
(but excluding) the next date on which there are no Events that have occurred
and are continuing (a "Damages Accrual Period"), the Company agrees to pay, as
liquidated damages and not as a penalty, an amount (the "Liquidated Damages
Amount") at the rate described below, payable periodically on each Damages
Payment Date to Record Holders of Notes that are Registrable Securities who are
Notice Holders to the extent of, for each such Damages Payment Date, accrued and
unpaid Liquidated Damages Amount to (but excluding) such Damages

                                       7
<PAGE>

Payment Date (or, if the Damages Accrual Period shall have ended prior to such
Damages Payment Date, the date of the end of the Damages Accrual Period);
provided that any Liquidated Damages Amount accrued with respect to any Note or
portion thereof called for redemption on a redemption date or converted into
Underlying Common Stock on a conversion date prior to the Damages Payment Date,
shall, in any such event, be paid instead to the Holder who submitted such Note
or portion thereof for redemption or conversion on the applicable redemption
date or conversion date, as the case may be, on such date (or promptly following
the conversion date, in the case of conversion). The Liquidated Damages Amount
shall accrue at a rate per annum equal to one-quarter of one percent (0.25%) for
the first 90-day period from the Event Date, and thereafter at a rate per annum
equal to one-half of one percent (0.5%) of the principal amount of such Notes
determined as of the Business Day immediately preceding the next Damages Payment
Date. Notwithstanding the foregoing, no Liquidated Damages Amounts shall accrue
as to any Registrable Security from and after the earlier of (x) the date such
security is no longer a Registrable Security and (y) expiration of the
Effectiveness Period. The rate of accrual of the Liquidated Damages Amount with
respect to any period shall not exceed the rate provided for in this paragraph
notwithstanding the occurrence of multiple concurrent Events. Following the cure
of all Events requiring the payment by the Company of Liquidated Damages Amounts
to the Holders of Registrable Securities pursuant to this Section, the accrual
of Liquidated Damages Amounts shall cease (without in any way limiting the
effect of any subsequent Event requiring the payment of Liquidated Damages
Amount by the Company).

      The Trustee shall be entitled, on behalf of Holders of Notes, to seek any
available remedy for the enforcement of this Agreement, including for the
payment of any Liquidated Damages Amount. Notwithstanding the foregoing, the
parties agree that the sole damages payable for a violation of the terms of this
Agreement with respect to which liquidated damages are expressly provided shall
be such liquidated damages.

      All of the Company's obligations set forth in this Section 2(e) that are
outstanding with respect to any Registrable Security at the time such security
ceases to be a Registrable Security shall survive until such time as all such
obligations with respect to such security have been satisfied in full
(notwithstanding termination of this Agreement pursuant to Section 8(k)).

      The parties hereto agree that the liquidated damages provided for in this
Section 2(e) constitute a reasonable estimate of the damages that may be
incurred by Holders of Registrable Securities by reason of the failure of the
Shelf Registration Statement to be filed or declared effective or available for
effecting resales of Registrable Securities in accordance with the provisions
hereof.

      Section 3. Registration Procedures. In connection with the registration
obligations of the Company under Section 2 hereof, the Company shall:

                                       8
<PAGE>

      (a) Prepare and file with the SEC a Shelf Registration Statement or Shelf
Registration Statements on Form S-1 or S-3 or any other appropriate form under
the Securities Act available for the sale of the Registrable Securities by the
Holders thereof in accordance with the intended method or methods of
distribution thereof, and use its reasonable best efforts to cause each such
Shelf Registration Statement to become effective and remain effective as
provided herein; provided that before filing any Shelf Registration Statement or
Prospectus or any amendments or supplements thereto with the SEC, the Company
shall furnish to the Initial Purchasers and counsel for the Holders and for the
Initial Purchasers (or, if applicable, separate counsel for the Holders) copies
of all such documents proposed to be filed and use its reasonable best efforts
to reflect in each such document when so filed with the SEC such comments as the
such counsel reasonably shall propose within three (3) Business Days of the
delivery of such copies to the Initial Purchasers and such counsel.

      (b) Prepare and file with the SEC such amendments and post-effective
amendments to each Shelf Registration Statement as may be necessary to keep such
Shelf Registration Statement continuously effective until the expiration of the
Effectiveness Period; cause the related Prospectus to be supplemented by any
required Prospectus supplement, and as so supplemented to be filed pursuant to
Rule 424 (or any similar provisions then in force) under the Securities Act; and
use its best efforts to comply with the provisions of the Securities Act
applicable to it with respect to the disposition of all securities covered by
such Shelf Registration Statement during the Effectiveness Period in accordance
with the intended methods of disposition by the sellers thereof set forth in
such Shelf Registration Statement as so amended or such Prospectus as so
supplemented.

      (c) As promptly as practicable give notice to the Notice Holders, the
Initial Purchasers and counsel for the Holders and for the Initial Purchasers
(or, if applicable, separate counsel for the Holders) (i) when any Prospectus,
Prospectus supplement, Shelf Registration Statement or post-effective amendment
to a Shelf Registration Statement has been filed with the SEC and, with respect
to a Shelf Registration Statement or any post-effective amendment, when the same
has been declared effective, (ii) of any request, following the effectiveness of
the Initial Shelf Registration Statement under the Securities Act, by the SEC or
any other federal or state governmental authority for amendments or supplements
to any Shelf Registration Statement or related Prospectus or for additional
information, (iii) of the issuance by the SEC or any other federal or state
governmental authority of any stop order suspending the effectiveness of any
Shelf Registration Statement or the initiation or threatening of any proceedings
for that purpose, (iv) of the receipt by the Company of any notification with
respect to the suspension of the qualification or exemption from qualification
of any of the Registrable Securities for sale in any jurisdiction or the
initiation or threatening of any proceeding for such purpose, (v) after the
effective date of any Shelf Registration Statement filed pursuant to this
Agreement of the occurrence of (but not the nature of or details concerning) a
Material Event and (vi) of the determination by the Company that a
post-effective amendment to a Shelf Registration Statement

                                       9
<PAGE>

will be filed with the SEC, which notice may, at the discretion of the Company
(or as required pursuant to Section 3(i)), state that it constitutes a
Suspension Notice, in which event the provisions of Section 3(i) shall apply.

      (d) Use its reasonable best efforts to prevent the issuance of, and, if
issued, to obtain the withdrawal of any order suspending the effectiveness of a
Shelf Registration Statement or the lifting of any suspension of the
qualification (or exemption from qualification) of any of the Registrable
Securities for sale in any jurisdiction in which they have been qualified for
sale, in either case at the earliest possible moment, and provide prompt notice
to each Notice Holder and the Initial Purchasers of the withdrawal of any such
order.

      (e) If requested by the Initial Purchasers or any Notice Holder, as
promptly as practicable incorporate in a Prospectus supplement or post-effective
amendment to a Shelf Registration Statement such information as the Initial
Purchasers, such Notice Holder or counsel for the Holders and for the Initial
Purchasers (or, if applicable, separate counsel for the Holders) shall determine
to be required to be included therein by applicable law and make any required
filings of such Prospectus supplement or such post-effective amendment; provided
that the Company shall not be required to take any actions under this Section
3(e) that, in the written opinion of counsel for the Company, are not in
compliance with applicable law.

      (f) As promptly as practicable furnish to each Notice Holder, counsel for
the Holders and for the Initial Purchasers (or, if applicable, separate counsel
for the Holders) and the Initial Purchasers, without charge, at least one (1)
conformed copy of the Shelf Registration Statement and any amendment thereto,
including financial statements but excluding schedules, all documents
incorporated or deemed to be incorporated therein by reference and all exhibits
(unless requested in writing to the Company by such Notice Holder, such counsel
or the Initial Purchasers).

      (g) During the Effectiveness Period, deliver to each Notice Holder,
counsel for the Holders and for the Initial Purchasers (or, if applicable,
separate counsel for the Holders) and the Initial Purchasers, in connection with
any sale of Registrable Securities pursuant to a Shelf Registration Statement,
without charge, as many copies of the Prospectus or Prospectuses relating to
such Registrable Securities (including each preliminary prospectus) and any
amendment or supplement thereto as such Notice Holder and the Initial Purchasers
may reasonably request; and the Company hereby consents (except during such
periods that a Suspension Notice is outstanding and has not been revoked) to the
use of such Prospectus or each amendment or supplement thereto by each Notice
Holder, in connection with any offering and sale of the Registrable Securities
covered by such Prospectus or any amendment or supplement thereto in the manner
set forth therein.

                                       10
<PAGE>

      (h) Prior to any public offering of the Registrable Securities pursuant to
the Shelf Registration Statement, use its reasonable best efforts to register or
qualify or cooperate with the Notice Holders in connection with the registration
or qualification (or exemption from such registration or qualification) of such
Registrable Securities for offer and sale under the securities or Blue Sky laws
of such jurisdictions within the United States as any Notice Holder reasonably
requests in writing (which request may be included in the Notice and
Questionnaire); prior to any public offering of the Registrable Securities
pursuant to the Shelf Registration Statement, use its best efforts to keep each
such registration or qualification (or exemption therefrom) effective during the
Effectiveness Period in connection with such Notice Holder's offer and sale of
Registrable Securities pursuant to such registration or qualification (or
exemption therefrom) and do any and all other acts or things reasonably
necessary or advisable to enable the disposition in such jurisdictions of such
Registrable Securities in the manner set forth in the relevant Shelf
Registration Statement and the related Prospectus; provided that the Company
will not be required to (i) qualify as a foreign corporation or as a dealer in
securities in any jurisdiction where it would not otherwise be required to
qualify but for this Agreement or (ii) take any action that would subject it to
general service of process in suits or to taxation in any such jurisdiction
where it is not then so subject.

      (i) Upon (A) the issuance by the SEC of a stop order suspending the
effectiveness of the Shelf Registration Statement or the initiation of
proceedings with respect to the Shelf Registration Statement under Section 8(d)
or 8(e) of the Securities Act, (B) the occurrence of any event or the existence
of any fact as a result of which any Shelf Registration Statement shall contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein not
misleading, or any Prospectus shall contain any untrue statement of a material
fact or omit to state any material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, or (C) the occurrence or existence of any pending
corporate development (a "Material Event") that, in the reasonable discretion of
the Company, makes it appropriate to suspend the availability of the Shelf
Registration Statement and the related Prospectus, (i) in the case of clause (B)
or (C) above, subject to the next sentence, as promptly as practicable, prepare
and file, if necessary pursuant to applicable law, a post-effective amendment to
such Shelf Registration Statement or a supplement to the related Prospectus or
any document incorporated therein by reference or file any other required
document that would be incorporated by reference into such Shelf Registration
Statement and Prospectus so that such Shelf Registration Statement does not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein
not misleading, and such Prospectus does not contain any untrue statement of a
material fact or omit to state any material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading (it being understood that the Company may rely on
information provided by each Notice Holder with respect to such

                                       11
<PAGE>

Notice Holder), as thereafter delivered to the purchasers of the Registrable
Securities being sold thereunder, and, in the case of a post-effective amendment
to a Shelf Registration Statement, subject to the next sentence, use its best
efforts to cause it to be declared effective as promptly as is practicable, and
(ii) give notice to the Notice Holders and counsel for the Holders and for the
Initial Purchasers (or, if applicable, separate counsel for the Holders) that
the availability of the Shelf Registration Statement is suspended (a "Suspension
Notice") and, upon receipt of any Suspension Notice, each Notice Holder agrees
not to sell any Registrable Securities pursuant to such Shelf Registration
Statement until such Notice Holder's receipt of copies of the supplemented or
amended Prospectus provided for in clause (i) above, or until it is advised in
writing by the Company that the Prospectus may be used, and has received copies
of any additional or supplemental filings that are incorporated or deemed
incorporated by reference in such Prospectus. The Company will use its
reasonable best efforts to ensure that the use of the Prospectus may be resumed
(x) in the case of clause (A) above, as promptly as is practicable, (y) in the
case of clause (B) above, as soon as, in the reasonable judgment of the Company,
the Shelf Registration Statement does not contain any untrue statement of a
material fact or omits to state any material fact required to be stated therein
or necessary to make the statements therein not misleading and the Prospectus
does not contain any untrue statement of a material fact or omits to state any
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading, and (z) in the
case of clause (C) above, as soon as, in the reasonable discretion of the
Company, such suspension is no longer appropriate. The period during which the
availability of the Shelf Registration Statement and any Prospectus may be
suspended (the "Suspension Period") without the Company incurring any obligation
to pay liquidated damages pursuant to Section 2(e) shall not exceed forty-five
(45) days in any three (3) month period and ninety (90) days in any twelve (12)
month period. The Effectiveness Period shall be extended by the number of days
from and including the date of the giving of the Suspension Notice to and
including the date on which the Notice Holder received copies of the
supplemented or amended Prospectus provided in clause (i) above, or the date on
which it is advised in writing by the Company that the Prospectus may be used,
and has received copies of any additional or supplemental filings that are
incorporated or deemed incorporated by reference in such Prospectus.

      (j) Make available for inspection during reasonable business hours by
representatives for the Notice Holders of such Registrable Securities, and any
broker-dealers, attorneys and accountants retained by such Notice Holders, all
relevant financial and other records and pertinent corporate documents and
properties of the Company and its subsidiaries, and cause the appropriate
officers, directors and employees of the Company and its subsidiaries, upon
reasonable advance notice to the Company, to make available for inspection
during normal business hours all relevant information reasonably requested by
such representatives for the Notice Holders, or any such broker-dealers,
attorneys or accountants in connection with such disposition, in each case as is
customary for similar "due diligence" examinations; provided, however, that such
persons shall,

                                       12
<PAGE>

at the Company's request, first agree in writing with the Company that any
information that is reasonably and in good faith designated by the Company in
writing as confidential at the time of delivery of such information shall be
kept confidential by such persons and shall be used solely for the purposes of
exercising rights under this Agreement, unless (i) disclosure of such
information is required by court or administrative order or is necessary to
respond to inquiries of regulatory authorities, (ii) disclosure of such
information is required by law (including any disclosure requirements pursuant
to federal securities laws in connection with the filing of any Shelf
Registration Statement or the use of any Prospectus referred to in this
Agreement), (iii) such information becomes generally available to the public
other than as a result of a disclosure or failure to safeguard by any such
person or (iv) such information becomes available to any such person from a
source other than the Company and such source is not bound by a confidentiality
agreement or is not otherwise under a duty of trust to the Company, and provided
that the foregoing inspection and information gathering shall, to the greatest
extent possible, be coordinated on behalf of all the Notice Holders and the
other parties entitled thereto by the counsel referred to in Section 5.

      (k) Comply with all applicable rules and regulations of the SEC and make
generally available to its securityholders earning statements (which need not be
audited) satisfying the provisions of Section 11(a) of the Securities Act and
Rule 158 thereunder (or any similar rule promulgated under the Securities Act)
no later than 45 days after the end of any 12-month period (or 90 days after the
end of any 12-month period if such period is a fiscal year) commencing on the
first day of the first fiscal quarter of the Company commencing after the
effective date of a Shelf Registration Statement, which statements shall cover
said 12-month periods.

      (l) Cooperate with each Notice Holder to facilitate the timely preparation
and delivery of certificates representing Registrable Securities sold pursuant
to a Shelf Registration Statement, which certificates shall not bear any
restrictive legends, and cause such Registrable Securities to be in such
denominations as are permitted by the Indenture and registered in such names as
such Notice Holder may request in writing at least (2) Business Days prior to
any sale of such Registrable Securities.

      (m) Provide a CUSIP number for all Registrable Securities covered by each
Shelf Registration Statement not later than the effective date of such Shelf
Registration Statement and provide the Trustee and the transfer agent for the
Common Stock with certificates for the Registrable Securities that are in a form
eligible for deposit with The Depository Trust Company.

      (n) Cooperate and assist in any filings required to be made with the
National Association of Securities Dealers, Inc.

                                       13
<PAGE>

      (o) Upon (i) the filing of the Initial Registration Statement and (ii) the
effectiveness of the Initial Registration Statement, announce the same, in each
case by release through a reputable national newswire service.

      (p) Enter into such customary agreements and take all such other necessary
actions in connection therewith (including those requested by the holders of a
majority of the Registrable Securities being sold) in order to expedite or
facilitate disposition of such Registrable Securities. Notwithstanding anything
herein to the contrary, no Holder may sell Registrable Securities in an
underwritten offering pursuant to a Shelf Registration Statement without the
prior written consent of the Company.

      (q) Cause the Indenture to be qualified under the TIA not later than the
effective date of any Shelf Registration Statement; and in connection therewith,
cooperate with the Trustee to effect such changes to the Indenture as may be
required for the Indenture to be so qualified in accordance with the terms of
the TIA and execute, and use its reasonable best efforts to cause the Trustee to
execute, all documents as may be required to effect such changes, and all other
forms and documents required to be filed with the SEC to enable the Indenture to
be so qualified in a timely manner.

      (r) List all Common Stock covered by such Registration Statement on any
securities exchange on which the Common Stock is then listed or authorize for
quotation on The Nasdaq Stock Market all Common Stock covered by such
Registration Statement if the Common Stock is then so authorized for quotation.

      Section 4. Holder's Obligations. Each Holder agrees, by acquisition of the
Registrable Securities, that no Holder of Registrable Securities shall be
entitled to sell any of such Registrable Securities pursuant to a Shelf
Registration Statement or to receive a Prospectus relating thereto, unless such
Holder has furnished the Company with a Notice and Questionnaire as required
pursuant to Section 2(d) hereof (including the information required to be
included in such Notice and Questionnaire) and the information set forth in the
next sentence and sells the Registrable Securities in accordance with the
provisions of the Shelf Registration Statement. Each Notice Holder agrees
promptly to furnish to the Company all information required to be disclosed in
order to make the information previously furnished to the Company by such Notice
Holder not misleading and any other information regarding such Notice Holder and
the distribution of such Registrable Securities as the Company may from time to
time reasonably request. Any sale of any Registrable Securities by any Holder
shall constitute a representation and warranty by such Holder that the
information relating to such Holder and its plan of distribution is as set forth
in the Prospectus delivered by such Holder in connection with such disposition,
that such Prospectus does not as of the time of such sale contain any untrue
statement of a material fact relating to or provided by such Holder or its plan
of distribution and that such Prospectus does not as of the time of such sale
omit to state any material fact relating to or provided by such Holder or its
plan of distribution necessary in

                                       14
<PAGE>

order to make the statements in such Prospectus, in the light of the
circumstances under which they were made, not misleading.

      Section 5. Registration Expenses. The Company shall bear all fees and
expenses incurred in connection with the performance by the Company of its
obligations under Section 2 and 3 of this Agreement whether or not any of the
Shelf Registration Statements are declared effective and whether or not any
securities are sold pursuant to any Shelf Registration Statement. Such fees and
expenses ("Registration Expenses") shall include, without limitation, (i) all
registration and filing fees (including, without limitation, fees and expenses
(x) with respect to filings required to be made with the National Association of
Securities Dealers, Inc. and (y) of compliance with federal and state securities
or Blue Sky laws (including, without limitation, reasonable fees and
disbursements of counsel for the Holders in connection with Blue Sky
qualifications of the Registrable Securities under the laws of such
jurisdictions as the Notice Holders of a majority of the Registrable Securities
being sold pursuant to a Shelf Registration Statement may designate)), (ii)
printing expenses (including, without limitation, expenses of printing
certificates for Registrable Securities in a form eligible for deposit with The
Depository Trust Company), (iii) duplication and mailing expenses relating to
copies of any Shelf Registration Statement or Prospectus delivered to any
Holders hereunder, (iv) fees and disbursements of counsel for the Company and
the fees and disbursements of one counsel for the Holders in connection with the
Shelf Registration Statement, (v) fees and disbursements of the Trustee and its
counsel and of the registrar and transfer agent for the Common Stock, (vi) fees
and disbursements of the Company's independent registered public accounting
firm, and (vii) Securities Act liability insurance obtained by the Company in
its sole discretion; provided that the Holders shall pay all selling expenses
with respect to such Holders, including, but not limited to, all underwriting
discounts and commissions of any underwriter with respect to the Registrable
Securities of such Holders that are sold. In addition, the Company shall pay the
internal expenses of the Company (including, without limitation, all salaries
and expenses of officers and employees performing legal or accounting duties),
the expense of any annual audit, the fees and expenses incurred in connection
with the listing by the Company of the Registrable Securities on any securities
exchange on which similar securities of the Company are then listed and the fees
and expenses of any person, including special experts, retained by the Company.

      Section 6. Indemnification; Contribution.

      (a) The Company agrees to indemnify, defend and hold harmless each Holder
and each person who controls any Holder within the meaning of Section 15 of the
Securities Act or Section 20 of the Exchange Act (each, a "Holder Indemnified
Party"), from and against any loss, damage, expense, liability or claim
(including the reasonable cost of investigation) which such Holder Indemnified
Party may incur under the Securities Act, the Exchange Act or otherwise, insofar
as such loss, damage, expense, liability or claim arises out of or

                                       15
<PAGE>

is based upon any untrue statement or alleged untrue statement of a material
fact contained in any Shelf Registration Statement or Prospectus or in any
amendment or supplement thereto or in any preliminary prospectus, or arises out
of or is based upon any omission or alleged omission to state a material fact
required to be stated in any Shelf Registration Statement or in any amendment or
supplement thereto or necessary to make the statements therein not misleading,
or arises out of or is based upon any omission or alleged omission to state a
material fact necessary in order to make the statements made in any Prospectus
or in any amendment or supplement thereto or in any preliminary prospectus, in
the light of the circumstances under which they were made, not misleading,
except insofar as any such loss, damage, expense, liability or claim arises out
of or is based upon any untrue statement or omission or alleged untrue statement
or omission of a material fact contained in, or omitted from, and in conformity
with information furnished in writing by or on behalf of any Holder to the
Company expressly for use therein.

      (b) Each Holder, severally and not jointly, agrees to indemnify, defend
and hold harmless the Company, its directors and officers and any person who
controls the Company within the meaning of Section 15 of the Securities Act or
Section 20 of the Exchange Act (each, a "Company Indemnified Party") from and
against any loss, damage, expense, liability or claim (including the reasonable
cost of investigation) which such Company Indemnified Party may incur under the
Securities Act, the Exchange Act or otherwise, insofar as such loss, damage,
expense, liability or claim arises out of or is based upon any untrue statement
or alleged untrue statement of a material fact contained in information
furnished in writing by or on behalf of such Holder to the Company expressly for
use in any Shelf Registration Statement or Prospectus or in any amendment or
supplement thereto or in any preliminary prospectus, or arises out of or is
based upon any omission or alleged omission to state a material fact required to
be stated in any Shelf Registration Statement or in any amendment or supplement
thereto or necessary to make the statements therein not misleading, or arises
out of or is based upon any omission or alleged omission to state a material
fact necessary in order to make the statements in any Prospectus or in any
amendment or supplement thereto or in any preliminary prospectus, in the light
of the circumstances under which they were made, not misleading, in connection
with such information. In no event shall the liability of any selling Holder of
Registrable Securities hereunder be greater in amount than the dollar amount of
the proceeds received by such Holder upon the sale of the Registrable Securities
pursuant to the Shelf Registration Statement giving rise to such indemnification
obligation.

      (c) If any action, suit or proceeding (each, a "Proceeding") is brought
against any person in respect of which indemnity may be sought pursuant to
either subsection (a) or (b) of this Section 6, such person (the "Indemnified
Party") shall promptly notify the person against whom such indemnity may be
sought (the "Indemnifying Party") in writing of the institution of such
Proceeding and the Indemnifying Party shall assume the defense of such
Proceeding; provided,

                                       16
<PAGE>

however, that the omission to notify such Indemnifying Party shall not relieve
such Indemnifying Party from any liability which it may have to such Indemnified
Party or otherwise. Such Indemnified Party shall have the right to employ its
own counsel in any such case, but the fees and expenses of such counsel shall be
at the expense of such Indemnified Party unless the employment of such counsel
shall have been authorized in writing by such Indemnifying Party in connection
with the defense of such Proceeding or such Indemnifying Party shall not have
employed counsel to have charge of the defense of such Proceeding within 30 days
of the receipt of notice thereof or such Indemnified Party shall have reasonably
concluded upon the written advice of counsel that there may be one or more
defenses available to it that are different from, additional to or in conflict
with those available to such Indemnifying Party (in which case such Indemnifying
Party shall not have the right to direct that portion of the defense of such
Proceeding on behalf of the Indemnified Party, but such Indemnifying Party may
employ counsel and participate in the defense thereof but the fees and expenses
of such counsel shall be at the expense of such Indemnifying Party), in any of
which events such reasonable fees and expenses shall be borne by such
Indemnifying Party and paid as incurred (it being understood, however, that such
Indemnifying Party shall not be liable for the expenses of more than one
separate counsel in any one Proceeding or series of related Proceedings together
with reasonably necessary local counsel representing the Indemnified Parties who
are parties to such action). An Indemnifying Party shall not be liable for any
settlement of such Proceeding effected without the written consent of such
Indemnifying Party, but if settled with the written consent of such Indemnifying
Party, such Indemnifying Party agrees to indemnify and hold harmless an
Indemnified Party from and against any loss or liability by reason of such
settlement. Notwithstanding the foregoing sentence, if at any time an
Indemnified Party shall have requested an Indemnifying Party to reimburse such
Indemnified Party for fees and expenses of counsel as contemplated by the second
sentence of this paragraph, then such Indemnifying Party agrees that it shall be
liable for any settlement of any Proceeding effected without its written consent
if (i) such settlement is entered into more than 60 Business Days after receipt
by such Indemnifying Party of the aforesaid request, (ii) such Indemnifying
Party shall not have reimbursed such Indemnified Party in accordance with such
request prior to the date of such settlement and (iii) such Indemnified Party
shall have given such Indemnifying Party at least 30 days' prior notice of its
intention to settle. No Indemnifying Party shall, without the prior written
consent of any Indemnified Party, effect any settlement of any pending or
threatened Proceeding in respect of which such Indemnified Party is or could
have been a party and indemnity could have been sought hereunder by such
Indemnified Party, unless such settlement includes an unconditional release of
such Indemnified Party from all liability on claims that are the subject matter
of such Proceeding and does not include an admission of fault, culpability or a
failure to act, by or on behalf of such Indemnified Party.

      (d) If the indemnification provided for in this Section 6 is unavailable
to an Indemnified Party under subsections (a) and (b) of this Section 6 in
respect of any losses, damages, expenses, liabilities or claims referred to
therein, then each

                                       17
<PAGE>

applicable Indemnifying Party, in lieu of indemnifying such Indemnified Party,
shall contribute to the amount paid or payable by such Indemnified Party as a
result of such losses, damages, expenses, liabilities or claims (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Company on the one hand and the Holders on the other hand from the offering of
the Registrable Securities or (ii) if the allocation provided by clause (i)
above is not permitted by applicable law, in such proportion as is appropriate
to reflect not only the relative benefits referred to in clause (i) above but
also the relative fault of the Company on the one hand and of the Holders on the
other in connection with the statements or omissions which resulted in such
losses, damages, expenses, liabilities or claims, as well as any other relevant
equitable considerations. The relative fault of the Company on the one hand and
of the Holders on the other shall be determined by reference to, among other
things, whether the untrue statement or alleged untrue statement of a material
fact or omission or alleged omission relates to information supplied by the
Company or by the Holders and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The amount paid or payable by a party as a result of the losses, damages,
expenses, liabilities and claims referred to above shall be deemed to include
any reasonable legal or other fees or expenses reasonably incurred by such party
in connection with investigating or defending any Proceeding.

      (e) The Company and the Holders agree that it would not be just and
equitable if contribution pursuant to this Section 6 were determined by pro rata
allocation or by any other method of allocation which does not take account of
the equitable considerations referred to in subsection (d) above.
Notwithstanding the provisions of this Section 6, no Holder shall be required to
contribute any amount in excess of the amount by which the total price at which
the Registrable Securities sold by it were offered to the public exceeds the
amount of any damages which it has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. The Holders' respective
obligations to contribute pursuant to this Section 6 are several in proportion
to the respective amount of Registrable Securities they have sold pursuant to a
Shelf Registration Statement, and not joint. The remedies provided for in this
Section 6 are not exclusive and shall not limit any rights or remedies which may
otherwise be available to any indemnified party at law or in equity.

      (f) The indemnity and contribution provisions contained in this Section 6
shall remain operative and in full force and effect regardless of (i) any
termination of this Agreement, (ii) any investigation made by or on behalf of
any Holder or any person controlling any Holder, or the Company, or the
Company's officers or directors or any person controlling the Company and (iii)
the sale of any Registrable Security by any Holder.

                                       18
<PAGE>

      Section 7. Information Requirements. (a) The Company covenants that, if at
any time before the end of the Effectiveness Period it is not subject to the
reporting requirements of the Exchange Act, it will cooperate with any Holder of
Registrable Securities and take such further action as any Holder of Registrable
Securities may reasonably request in writing (including, without limitation,
making such representations as any such Holder may reasonably request), all to
the extent required from time to time to enable such Holder to sell Registrable
Securities without registration under the Securities Act within the limitation
of the exemptions provided by Rule 144, Rule 144A, Regulation S and Regulation D
under the Securities Act and customarily taken in connection with sales pursuant
to such exemptions. Upon the written request of any Holder of Registrable
Securities, the Company shall deliver to such Holder a written statement as to
whether it has complied with such filing requirements, unless such a statement
has been included in the Company's most recent report filed with the SEC
pursuant to Section 13 or Section 15(d) of Exchange Act. Notwithstanding the
foregoing, nothing in this Section 7 shall be deemed to require the Company to
register any of its securities (other than the Common Stock) under any section
of the Exchange Act.

      (b) The Company shall file the reports required to be filed by it under
the Exchange Act and shall comply with all other requirements set forth in the
instructions to Form S-1 or Form S-3, as the case may be, in order to allow the
Company to be eligible to file registration statements on Form S-1 or Form S-3.

      Section 8. Miscellaneous.

      (a) No Conflicting Agreements. The Company is not, as of the date hereof,
a party to, nor shall it, on or after the date of this Agreement, enter into,
any agreement with respect to its securities that conflicts with the rights
granted to the Holders of Registrable Securities in this Agreement. The Company
represents and warrants that the rights granted to the Holders of Registrable
Securities hereunder do not in any way conflict with the rights granted to the
holders of the Company's securities under any other agreements.

      (b) Amendments and Waivers. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given, unless the Company has obtained the written consent of Holders of a
majority of the then outstanding Underlying Common Stock constituting
Registrable Securities (with Holders of Notes deemed to be the Holders, for
purposes of this Section, of the number of outstanding shares of Underlying
Common Stock into which such Notes are or would be convertible as of the date on
which such consent is requested). Notwithstanding the foregoing, a waiver or
consent to depart from the provisions hereof with respect to a matter that
relates exclusively to the rights of Holders of Registrable Securities whose
securities are being sold pursuant to a Shelf Registration Statement and that
does not directly or indirectly affect the rights of other Holders of
Registrable

                                       19
<PAGE>

Securities may be given by Holders of at least a majority of the Registrable
Securities being sold by such Holders pursuant to such Shelf Registration
Statement; provided that the provisions of this sentence may not be amended,
modified, or supplemented except in accordance with the provisions of the
immediately preceding sentence. Each Holder of Registrable Securities
outstanding at the time of any such amendment, modification, supplement, waiver
or consent or thereafter shall be bound by any such amendment, modification,
supplement, waiver or consent effected pursuant to this Section 8(b), whether or
not any notice, writing or marking indicating such amendment, modification,
supplement, waiver or consent appears on the Registrable Securities or is
delivered to such Holder.

      (c) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, by telecopier, by
courier guaranteeing overnight delivery or by first-class mail, return receipt
requested, and shall be deemed given (i) when made, if made by hand delivery,
(ii) upon confirmation, if made by telecopier, (iii) one (1) Business Day after
being deposited with such courier, if made by overnight courier or (iv) on the
date indicated on the notice of receipt, if made by first-class mail, to the
parties as follows:

      (x) if to a Holder of Registrable Securities, at the most current address
given by such Holder to the Company in a Notice and Questionnaire or any
amendment thereto;

      (y) if to the Company, to:

          Toreador Resources Corporation
          4809 Cole Avenue, Suite 108
          Dallas, Texas 75205
          Attention: Douglas W. Weir
          Telecopy No.:(214) 559-3933

      (z) if to the Initial Purchasers, to:

          c/o UBS Securities LLC
          299 Park Avenue
          New York, New York 10171
          Attention: Syndicate Department
          Telecopy No.: (212) 713-3460

          with a copy to (for informational purposes only):

          c/o UBS Securities LLC
          299 Park Avenue
          New York, New York 10171
          Attention: Legal Department

                                       20
<PAGE>

          Telecopy No.: (212) 821-4042

or to such other address as such person may have furnished to the other persons
identified in this Section 8(c) in writing in accordance herewith.

      (d) Approval of Holders. Whenever the consent or approval of Holders of a
specified percentage of Registrable Securities is required hereunder,
Registrable Securities held by the Company or its affiliates (as such term is
defined in Rule 405 under the Securities Act) (other than the Initial Purchasers
or subsequent Holders of Registrable Securities if such subsequent Holders are
deemed to be such affiliates solely by reason of their holdings of such
Registrable Securities) shall not be counted in determining whether such consent
or approval was given by the Holders of such required percentage.

      (e) Successors and Assigns. Any person who purchases any Registrable
Securities from the Initial Purchasers or any Holder shall be deemed, for
purposes of this Agreement, to be an assignee of the Initial Purchasers or such
Holder, as the case may be. This Agreement shall inure to the benefit of and be
binding upon the successors and assigns of each of the parties and shall inure
to the benefit of and be binding upon each Holder of any Registrable Securities.
The Company may not assign its rights or obligations hereunder without the prior
written consent of each Holder of Registrable Securities, other than by
operation of law pursuant to a merger or consolidation to which the Company is a
party. In the event the Notes become convertible into securities of another
person pursuant to Section 10.12 of the Indenture, the Company shall cause such
person to assume the Company's obligations hereunder.

      (f) Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be original and all of which taken together
shall constitute one and the same agreement.

      (g) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

      (h) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICTS
OF LAWS PRINCIPLES THEREOF.

      (i) Severability. If any term, provision, covenant or restriction of this
Agreement is held to be invalid, illegal, void or unenforceable, the remainder
of the terms, provisions, covenants and restrictions set forth herein shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated thereby, and the parties hereto shall use its best efforts to find
and employ an alternative means to achieve the same or substantially the same
result as that contemplated by such term, provision, covenant or restriction, it
being intended

                                       21
<PAGE>

that all of the rights and privileges of the parties shall be enforceable to the
fullest extent permitted by law.

      (j) Entire Agreement. This Agreement is intended by the parties as a final
expression of their agreement and is intended to be a complete and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject matter contained herein and the registration rights granted by the
Company with respect to the Registrable Securities. Except as provided in the
Purchase Agreement, there are no restrictions, promises, warranties or
undertakings, other than those set forth or referred to herein, with respect to
the registration rights granted by the Company with respect to the Registrable
Securities. This Agreement supersedes all prior agreements and undertakings
among the parties with respect to such registration rights. No party hereto
shall have any rights, duties or obligations other than those specifically set
forth in this Agreement.

      (k) Termination. This Agreement and the obligations of the parties
hereunder shall terminate upon the end of the Effectiveness Period, except for
any liabilities or obligations under Section 4, 5 or 6 hereof and the
obligations to make payments of and provide for liquidated damages under Section
2(e) hereof to the extent such damages accrue prior to the end of the
Effectiveness Period, each of which shall remain in effect in accordance with
its terms.

                                       22
<PAGE>

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first written above.

                                              TOREADOR RESOURCES CORPORATION

                                              By: /s/ G. Thomas Graves III
                                                  --------------------------
                                                  Name: G. Thomas Graves III
                                                  Title: CEO, President

Confirmed and accepted as of the date
first above written on behalf of itself
and the other several Initial Purchasers:

UBS SECURITIES LLC

By: /s/ Michael Jamieson
    ------------------------
    Name: Michael Jamieson
    Title: Managing Director

By: /s/ Sam Pitts
    ------------------------
    Name: Sam Pitts
    Title: Director

                                       23