Document:

EX-10.1

FIFTH AMENDMENT TO

GROUP 1 AUTOMOTIVE, INC.

1996 STOCK INCENTIVE PLAN

WHEREAS, GROUP 1 AUTOMOTIVE, INC. (the “Company”) has heretofore adopted the GROUP 1
AUTOMOTIVE, INC. 1996 STOCK INCENTIVE PLAN (the “Plan”); and

WHEREAS, the Company desires to amend the Plan to provide for the grant of Phantom Stock
Awards;

NOW, THEREFORE, the Plan shall be amended as follows, effective as of March 10, 2005:

1. The last sentence of Paragraph I of the Plan shall be deleted and the following shall be
substituted therefor:

“Accordingly, the Plan provides for granting Incentive Stock Options, options that do not
constitute Incentive Stock Options, Restricted Stock Awards, Phantom Stock Awards, or any
combination of the foregoing, as is best suited to the circumstances of the particular
employee, consultant, advisor, or director as provided herein.”

2. Paragraph II(a) of the Plan shall be deleted and the following shall be substituted therefor:

“(a) ‘Award’ means, individually or collectively, any Option, Restricted Stock Award or
Phantom Stock Award.”

3. The following new subparagraphs (p) and (q) shall be added to Paragraph II of the Plan, and each
of the subsequent subparagraphs of Paragraph II shall be relettered accordingly:

“(p) ‘Phantom Stock Award’ means an Award granted under Paragraph VIIIA of the Plan.

(q) ‘Phantom Stock Award Agreement’ means a written agreement between the Company and a
Holder with respect to a Phantom Stock Award.”

4. The first sentence of Paragraph IV(b) of the Plan shall be deleted and the following shall be
substituted therefor:

“Subject to the express provisions of the Plan, the Committee shall have authority, in its
discretion, to determine which employees, Consultants, or Directors shall receive an Award,
the time or times when such Award shall be made, whether an Incentive Stock Option or
nonqualified Option shall be granted, and the number of shares to be subject to each Option,
Restricted Stock Award or Phantom Stock Award.”

5. The second sentence of Paragraph VI of the Plan shall be deleted and the following shall be
substituted therefor:

“An Award may be granted on more than one occasion to the same person, and, subject to the
limitations set forth in the Plan, such Award may include an Incentive Stock Option, an
Option that is not an Incentive Stock Option, a Restricted Stock Award, a Phantom Stock
Award, or any combination thereof.”

6. The following new Article VIIIA shall be added to the Plan immediately following Article VIII
thereof:

“VIIIA            PHANTOM STOCK AWARDS

(a) Phantom Stock Awards. Phantom Stock Awards are rights to receive shares of
Common Stock (or the Fair Market Value thereof) which vest over a period of time as
established by the Committee, without satisfaction of any performance criteria or
objectives. The Committee may, in its discretion, require payment or other conditions of
the Holder respecting any Phantom Stock Award.

(b) Award Period. The Committee shall establish, with respect to and at the
time of each Phantom Stock Award, a period over which the Award shall vest with respect to
the Holder.

(c) Awards Criteria. In determining the value of Phantom Stock Awards, the
Committee shall take into account a Holder’s responsibility level, performance, potential,
other Awards, and such other considerations as it deems appropriate.

(d) Payment. Following the end of the vesting period for a Phantom Stock Award
(or at such other time as the applicable Phantom Stock Award Agreement may provide), the
Holder of a Phantom Stock Award shall be entitled to receive payment of an amount, not
exceeding the maximum value of the Phantom Stock Award, based on the then vested value of
the Award. Payment of a Phantom Stock Award may be made in cash, Common Stock, or a
combination thereof as determined by the Committee. Payment shall be made in a lump sum or
in installments as prescribed by the Committee. Any payment to be made in cash shall be
based on the Fair Market Value of the Common Stock on the payment date or such other date as
may be specified by the Committee in the Phantom Stock Award Agreement. Cash dividend
equivalents may be paid during or after the vesting period with respect to a Phantom Stock
Award, as determined by the Committee.

(e) Termination of Award. A Phantom Stock Award shall terminate if the Holder
does not remain continuously in the employ of the Company or does not continue to perform
services as a Consultant or a Director for the Company at all times during the applicable
vesting period, except as may be otherwise determined by the Committee.

(f) Phantom Stock Award Agreements. At the time any Award is made under this
Paragraph VIIIA, the Company and the Holder shall enter into a Phantom Stock Award Agreement
setting forth each of the matters contemplated hereby, and such additional matters as the
Committee may determine to be appropriate. The terms and provisions of the respective
Phantom Stock Award Agreements need not be identical.”

7. Paragraph IX(b) of the Plan shall be deleted and the following shall be substituted therefor:

“(b) The shares with respect to which Awards may be granted are shares of Common Stock
as presently constituted, but if, and whenever, prior to the expiration of an Award
theretofore granted, the Company shall effect a subdivision or consolidation of shares of
Common Stock or the payment of a stock dividend on Common Stock without receipt of
consideration by the Company, the number of shares of Common Stock with respect to which
such Award may thereafter be exercised or satisfied, as applicable, (i) in the event of an
increase in the number of outstanding shares shall be proportionately increased, and the
purchase price per share shall be proportionately reduced, and (ii) in the event of a
reduction in the number of outstanding shares shall be proportionately reduced, and the
purchase price per share shall be proportionately increased. Any fractional share resulting
from such adjustment shall be rounded up to the next whole share.”

8. The term “Option” in the first sentence of Paragraph IX(c) of the Plan shall be deleted and the
term “Award” shall be substituted therefor.

9. The following shall be added to the end of Paragraph IX(h) of the Plan:

“In addition, Plan provisions to the contrary notwithstanding, except as otherwise provided
by the Committee, in the event of a change in the ownership or effective control of the
Company, or in the ownership of a substantial portion of the assets of the Company, within
the meaning of Section 409A(a)(2)(A)(v) of the Code and any regulations or administrative
guidance issued thereunder, the Committee, acting in its sole discretion without the consent
or approval of any Holder, may require the mandatory surrender to the Company by selected
Holders of some or all of the outstanding Phantom Stock Awards as of a date, before or after
such event, specified by the Committee, in which event the Committee shall thereupon cancel
such Phantom Stock Awards and the Company shall pay (or cause to be paid) to each Holder an
amount equal to the maximum value (which maximum value shall be determined based on the then
Fair Market Value of the Common Stock) of such Holder’s Phantom Stock Awards. Any such
payment may be made in cash, Common Stock, or a combination thereof as determined by the
Committee in its sole discretion.”

10. The first sentence in Paragraph XI(a) of the Plan shall be deleted and the following shall be
substituted therefor:

“Neither the adoption of the Plan nor any action of the Board or of the Committee shall be
deemed to give an employee, Consultant, or Director any right to be granted an Option, a
right to a Restricted Stock Award, a right to a Phantom Stock Award, or any other rights
hereunder except as may be evidenced by an Award agreement duly executed on behalf of the
Company, and then only to the extent and on the terms and conditions expressly set forth
therein.”

11. As amended, the Plan is specifically ratified and reaffirmed.

2053464_1.DOCEX-10.2

RESTRICTED STOCK AGREEMENT

THIS RESTRICTED STOCK AGREEMENT (this “Agreement”) is made as of the effective date
set forth on the attached notice of grant (the “Grant Notice”), between GROUP 1 AUTOMOTIVE,
INC., a Delaware corporation (the “Company”), and the employee set forth on the Grant
Notice (“Employee”).

1. Award. Pursuant to the GROUP 1 AUTOMOTIVE, INC. 1996 STOCK INCENTIVE PLAN, as
amended (the “Plan”), the number of shares (the “Restricted Shares”) of the
Company’s common stock set forth in the Grant Notice shall be issued as hereinafter provided in
Employee’s name, subject to certain restrictions thereon. The Restricted Shares shall be issued
upon acceptance hereof by Employee (which shall be demonstrated by Employee’s execution of the
Grant Notice) and upon satisfaction of the conditions of this Agreement and the Grant Notice.
Employee acknowledges receipt of a copy of the Plan, and agrees that this award of Restricted
Shares shall be subject to all of the terms and provisions of the Plan, including future amendments
thereto, if any, pursuant to the terms thereof. In the event of any conflict between the terms of
this Agreement and the Plan, the Plan shall control. The Plan and the Grant Notice are
incorporated herein by reference as a part of this Agreement.

2. Restricted Shares. Employee hereby accepts the Restricted Shares when issued and
agrees with respect thereto as follows:

(a) Forfeiture Restrictions. The Restricted Shares may not be sold, assigned,
pledged, exchanged, hypothecated or otherwise transferred, encumbered or disposed of to the
extent then subject to the Forfeiture Restrictions (as hereinafter defined), and in the
event of termination of Employee’s employment with the Company for any reason other than
death or Disability (as hereinafter defined), Employee shall, for no consideration, forfeit
to the Company all Restricted Shares to the extent then subject to the Forfeiture
Restrictions. The prohibition against transfer and the obligation to forfeit and surrender
Restricted Shares to the Company upon termination of employment are herein referred to as
the “Forfeiture Restrictions.” The Forfeiture Restrictions shall be binding upon
and enforceable against any transferee of Restricted Shares. For purposes of this
Agreement, the following capitalized words and terms shall have the meanings indicated
below:

(i) “Board” shall mean the Board of Directors of the Company.

(ii) “Code” shall mean the Internal Revenue Code of 1986, as amended.

(iii) “Committee” shall mean the committee of the Board that is
selected by the Board to administer the Plan as provided in Paragraph IV(a) of the
Plan.

(iv) “Disability” shall mean that Employee has become disabled within
the meaning of section 409A(a)(2)(C) of the Code and applicable administrative
authority thereunder.

(b) Lapse of Forfeiture Restrictions. The Forfeiture Restrictions shall lapse
as to the Restricted Shares in accordance with the schedule set forth on the Grant Notice,
provided that Employee has been continuously employed by the Company from the date of this
Agreement through the lapse date set forth on the Grant Notice. Notwithstanding the
foregoing, the Forfeiture Restrictions shall lapse as to all of the Restricted Shares then
subject to the Forfeiture Restrictions on the date Employee’s employment with the Company is
terminated by reason of death or Disability.

(c) Certificates. A certificate evidencing the Restricted Shares shall be
issued by the Company in Employee’s name, pursuant to which Employee shall have all of the
rights of a stockholder of the Company with respect to the Restricted Shares, including,
without limitation, voting rights and the right to receive dividends (provided, however,
that dividends paid in shares of the Company’s stock shall be subject to the Forfeiture
Restrictions). Employee may not sell, transfer, pledge, exchange, hypothecate or otherwise
dispose of the stock until the Forfeiture Restrictions have expired and a breach of the
terms of this Agreement shall cause a forfeiture of the Restricted Shares. The certificate
shall be delivered upon issuance to the Secretary of the Company or to such other depository
as may be designated by the Committee as a depository for safekeeping until the forfeiture
of such Restricted Shares occurs or the Forfeiture Restrictions lapse pursuant to the terms
of the Plan and this award. On the date of this Agreement, Employee shall deliver to the
Company a stock power, endorsed in blank, relating to the Restricted Shares. Upon the lapse
of the Forfeiture Restrictions without forfeiture, the Company shall cause a new certificate
or certificates to be issued without legend (except for any legend required pursuant to
applicable securities laws or any other agreement to which Employee is a party) in the name
of Employee in exchange for the certificate evidencing the Restricted Shares. However, the
Company, in its sole discretion, may elect to deliver the certificate either in certificate
form or electronically to a brokerage account established for Employee’s benefit at a
brokerage/financial institution selected by the Company. Employee agrees to complete and
sign any documents and take additional action that the Company may request to enable it to
deliver the shares on Employee’s behalf.

(d) Corporate Acts. The existence of the Restricted Shares shall not affect in
any way the right or power of the Board or the stockholders of the Company to make or
authorize any adjustment, recapitalization, reorganization or other change in the Company’s
capital structure or its business, any merger or consolidation of the Company, any issue of
debt or equity securities, the dissolution or liquidation of the Company or any sale, lease,
exchange or other disposition of all or any part of its assets or business or any other
corporate act or proceeding. The prohibitions of Section 2(a) hereof shall not apply to the
transfer of Restricted Shares pursuant to a plan of reorganization of the Company, but the
stock, securities or other property received in exchange therefor shall also become subject
to the Forfeiture Restrictions and provisions governing the lapsing of such Forfeiture
Restrictions applicable to the original Restricted Shares for all purposes of this Agreement
and the certificates representing such stock, securities or other property shall be legended
to show such restrictions.

3. Withholding of Tax/Tax Election. To the extent that the receipt of the Restricted
Shares or the lapse of any Forfeiture Restrictions results in compensation income to Employee for
federal or state income tax purposes, Employee shall deliver to the Company at the time of such
receipt or lapse, as the case may be, such amount of money as the Company may require to meet its
obligation under applicable tax laws or regulations or make such other arrangements to satisfy such
withholding obligation as the Company, in its sole discretion, may approve. In addition, the
Company may withhold unrestricted shares of stock of the Company (valued at their fair market value
on the date of withholding of such shares) otherwise to be issued upon the lapse of the Forfeiture
Restrictions to satisfy its withholding obligations. If Employee makes the election authorized by
section 83(b) of the Code in connection with the award of the Restricted Shares, Employee shall
submit to the Company a copy of the statement filed by Employee to make such election.

4. Status of Stock. Employee agrees that the Restricted Shares issued under this
Agreement will not be sold or otherwise disposed of in any manner which would constitute a
violation of any applicable securities laws, whether federal or state, or the Company’s Code of
Conduct. Employee also agrees that (a) the certificates representing the Restricted Shares may
bear such legend or legends as the Committee deems appropriate in order to reflect the Forfeiture
Restrictions and to assure compliance with applicable securities laws, (b) the Company may refuse
to register the transfer of the Restricted Shares on the stock transfer records of the Company if
such proposed transfer would constitute a violation of the Forfeiture Restrictions or, in the
opinion of counsel satisfactory to the Company, of any applicable securities law, and (c) the
Company may give related instructions to its transfer agent, if any, to stop registration of the
transfer of the Restricted Shares.

5. Employment Relationship. For purposes of this Agreement, Employee shall be
considered to be in the employment of the Company as long as Employee remains an employee or a
consultant of either the Company, a parent or subsidiary corporation (as defined in section 424 of
the Code) of the Company, or any successor corporation. Nothing in the adoption of the Plan, nor
the award of the Restricted Shares thereunder pursuant to this Agreement, shall confer upon
Employee the right to continued employment or engagement as a consultant by the Company or affect
in any way the right of the Company to terminate such employment or consulting relationship at any
time. Unless otherwise provided in a written employment or consulting agreement or by applicable
law, Employee’s employment or engagement as a consultant by the Company shall be on an at-will
basis, and the employment and/or consulting relationship may be terminated at any time by either
Employee or the Company for any reason whatsoever, with or without cause. Any question as to
whether and when there has been a termination of such employment and/or consulting relationship,
and the cause of such termination, shall be determined by the Committee, and its determination
shall be final.

6. Notices. Any notices or other communications provided for in this Agreement shall
be sufficient if in writing. In the case of Employee, such notices or communications shall be
effectively delivered if hand delivered to Employee at his principal place of employment or if sent
by registered or certified mail to Employee at the last address Employee has filed with the
Company. In the case of the Company, such notices or communications shall be effectively delivered
if sent by registered or certified mail to the Company at its principal executive offices.

7. Entire Agreement; Amendment. This Agreement and the documents incorporated by
reference herein replace and merge all previous agreements and discussions relating to the same or
similar subject matters between Employee and the Company and constitute the entire agreement
between Employee and the Company with respect to the subject matter of this Agreement; provided,
however, that the terms of this Agreement shall not modify and shall be subject to the terms and
conditions of any employment, consulting and/or severance agreement between the Company and
Employee in effect as of the date a determination is to be made under this Agreement. Without
limiting the scope of the preceding sentence, except as provided therein, all prior understandings
and agreements, if any, among the parties hereto relating to the subject matter hereof are hereby
null and void and of no further force and effect. Any modification of this Agreement shall be
effective only if it is in writing and signed by both Employee and an authorized officer of the
Company.

8. Binding Effect. This Agreement shall be binding upon and inure to the benefit of
any successors to the Company and all persons lawfully claiming under Employee.

9. Controlling Law. This Agreement shall be governed by, and construed in accordance
with, the laws of the State of Delaware, without regard to conflicts of laws principles thereof.

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