Document:

EX-10.5

PHANTOM STOCK AGREEMENT

THIS PHANTOM 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 Director set forth on the Grant
Notice (“Director”).

1. Award of Phantom Shares. Pursuant to the GROUP 1 AUTOMOTIVE, INC. 1996 STOCK
INCENTIVE PLAN, as amended (the “Plan”), the Company hereby awards the number of phantom
shares of the Company (the “Phantom Shares”) set forth in the Grant Notice to Director,
subject to the terms and restrictions set forth herein. Director acknowledges receipt of a copy of
the Plan, and agrees that this award of Phantom 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. Vesting and Forfeiture of Phantom Shares. (a) The Phantom Shares shall become
vested in accordance with the schedule set forth on the Grant Notice, provided that Director has
been a member of the Board continuously from the date of this Agreement through the applicable
vesting date set forth on the Grant Notice. Notwithstanding the foregoing, all unvested Phantom
Shares shall become fully vested on the date Director’s membership on the Board is terminated by
reason of death or “Disability” (which shall mean that Director has become disabled within
the meaning of section 409A(a)(2)(C) of the Internal Revenue Code of 1986, as amended (the
“Code”), and any regulations or administrative guidance issued thereunder).

(b) While a Phantom Share remains outstanding pursuant to this Agreement, an amount equivalent
to the cash dividends paid with respect to a share of the Company’s common stock (“Common
Stock”) during such period shall be held by the Company without interest until a share of
Common Stock is deliverable to Director with respect to such Phantom Share or such Phantom Share is
forfeited, and then such amount shall be paid to Director or forfeited, as the case may be.

(c) In the event of the termination of Director’s membership on the Board for any reason other
than death or Disability, Director shall, for no consideration, forfeit to the Company all unvested
Phantom Shares.

3. Delivery/Certificates. Upon termination of Director’s membership on the Board for
any reason, the Company shall cause a certificate or certificates for shares of Common Stock to be
issued without legend (except for any legend required pursuant to applicable securities laws or any
other agreement to which Director is a party) in the name of Director in cancellation for the
Phantom Shares that are vested, if any, as of the date of such termination. Notwithstanding the
foregoing however, issuance of Common Stock may not be made pursuant to this Agreement prior to the
first day such issuance would not be subject to the additional tax imposed by Section 409A of the
Code.

The Company, in its sole discretion, may elect to deliver certificates either in certificate
form or electronically to a brokerage account established for Director’s benefit at a
brokerage/financial institution selected by the Company. Director agrees to complete and sign any
documents and take additional action that the Company may request to enable it to deliver the
shares on Director’s behalf.

4. Nontransferability of Phantom Shares. Director may not sell, transfer, pledge,
exchange, hypothecate or dispose of the Phantom Shares. A breach of these terms of this Agreement
shall cause a forfeiture of the Phantom Shares.

5. Withholding of Tax. To the extent that the grant or vesting of the Phantom Shares,
or the delivery of Common Stock with respect thereto, results in compensation income to Director
for federal or state income tax purposes, Director shall deliver to the Company such amount of
money at such time 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 shares of Common Stock
(valued at their fair market value on the date of withholding of such shares) otherwise to be
delivered to Director to satisfy its withholding obligations.

6. Status of Stock. Director agrees that the Common Stock that may be 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. Director also agrees that (a) the certificates representing shares of Common Stock that
may be issued under this Agreement may bear such legend or legends as the Committee deems
appropriate in order to assure compliance with applicable securities laws, (b) the Company may
refuse to register the transfer of such shares of Common Stock on the stock transfer records of the
Company if such proposed transfer would in the opinion of counsel satisfactory to the Company
constitute a violation 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 such shares of
Common Stock.

7. Board Membership. Nothing in the adoption of the Plan, nor the award of Phantom
Shares thereunder pursuant to this Agreement, shall confer upon Director the right to continued
membership on the Board or limit in any way the right of the Board or the stockholders of the
Company to terminate Director’s membership on the Board at any time. Any question as to whether
and when there has been a termination of Director’s membership on the Board, and the cause of such
termination, shall be determined by the Committee, and its determination shall be final.

8. 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 Director and the Company and constitute the entire agreement
between Director and the Company with respect to the subject matter of this Agreement. 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.

Except as provided below, any modification of this Agreement shall be effective only if it is
in writing and signed by both Director and an authorized officer of the Company. Notwithstanding
anything in the Plan or this Agreement to the contrary, if the Committee determines that the terms
of this grant do not, in whole or in part, satisfy the requirements of Section 409A of the Code,
the Committee, in its sole discretion, may unilaterally modify this Agreement in such manner as it
deems appropriate to comply with such section and any regulations or administrative guidance issued
thereunder.

9. 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 Director.

10. 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.EX-10.1

Exhibit 10.1

March 15, 2005

Dr. Axel J. Unterbeck

Re: Separation of Employment

Dear Axel:

This letter sets forth the agreement (the “Agreement”) concerning your change of employment
status with Memory Pharmaceuticals Corp., including its present or former parent, subsidiaries,
divisions, affiliates, successors, assigns, representatives, agents, shareholders, officers,
directors and employees (collectively the “Company”). We want to minimize any disruption that your
separation may cause you, and therefore, would like to offer you financial assistance, subject to
the terms of this Agreement. The following information outlines the terms of your separation and
the consideration being offered to you.

1. This shall confirm that you voluntarily resigned your employment with the Company effective
April 1, 2005. Provided that you execute and deliver this Agreement in a timely manner and not
exercise your right to revoke it, as consideration for this Agreement, the Company will extend the
exercisability of your stock options post-termination from three months to up to twelve (12) months
upon your written request at any time or from time to time after the date hereof. As additional
consideration, the Company will allow you the opportunity to be a consultant, for a period of six
months commencing the next day following the later of (i) the effective date of your resignation,
or (ii) the expiration of the revocation period defined below. In this regard, the Company shall
require you to sign the Consulting Agreement annexed hereto as Exhibit A, the terms and conditions
of which include, but are not limited to, your agreement to execute a General Release on or about
the conclusion of the consulting term (annexed to the Consulting Agreement as Exhibit 1).

Regardless of whether you sign this Agreement, and in addition to the employee benefit
continuation provisions set forth in the Consulting Agreement, the Company will allow you to
continue as a member of its group health insurance plans at your own expense in accordance with the
applicable plan, as well as applicable federal and/or state law, for the benefit continuation
period required by applicable law.

From and after the date hereof, the Company shall honor all of its indemnification obligations
to you, in your capacity as a former director and officer of the Company, whether such
indemnification obligations arise pursuant to the Company’s certificate of incorporation, bylaws or
otherwise. The Company shall maintain in effect for five years from the date hereof the current
directors’ and officers’ liability insurance policies maintained by the Company (provided that the
Company may substitute therefor policies of at least the same coverage containing terms and
conditions which are not materially less favorable) with respect to matters occurring prior to the
effective date of your resignation.

2. You acknowledge that you have been paid and/or have received all compensation, wages,
bonuses, commissions, and/or benefits to which you may be entitled and that no other compensation,
wages, bonuses, commissions and/or benefits are due to you, except as provided herein. In addition,
you acknowledge that the consideration set forth herein exceeds any payments and/or benefits
provided in any agreement, verbal or written, as well as any employment or personnel policy,
procedure or handbook, which may be applicable to you, including but not limited to your January 5,
1998 Employment Agreement, November 12, 1999 Letter Agreement (effective July 1, 1999), March 4,
2002 Letter Agreement, March 4, 2002 Letter regarding sale of Series D stock, and August 14, 2002
Letter Agreement, the Company’s 1998 Employee, Director and Consultant Stock Option Plan (the “1998
Plan”), the Company’s 2004 Stock Incentive Plan (the “2004 Plan”), and all applicable stock option
agreements (if any) under the 1998 Plan and the 2004 Plan. You acknowledge that you would not be
entitled to this consideration absent your promises set forth herein.

3. In exchange for the Company providing you with the above-referenced consideration, which
you acknowledge is good and valuable consideration to support this Agreement, you hereby waive all
claims against the Company, and release and discharge the Company from liability for any claims or
damages you may have against it as of the date of this Agreement, whether known or unknown,
including, but not limited to, any alleged violation of the Age Discrimination in Employment Act,
as amended, the Older Worker Benefits Protection Act; Title VII of the Civil Rights of 1964, as
amended; Sections 1981 through 1988 of Title 42 of the United States Code; the Civil Rights Act of
1991; the Equal Pay Act; the Americans with Disabilities Act; the Rehabilitation Act; the Family
and Medical Leave Act; the Fair Labor Standards Act; the Employee Retirement Income Security Act of
1974, as amended; the Worker Adjustment and Retraining Notification Act; the National Labor
Relations Act; the Fair Credit Reporting Act; the Occupational Safety and Health Act; the Uniformed
Services Employment and Reemployment Act; the Employee Polygraph Protection Act; the Immigration
Reform Control Act; the retaliation provisions of the Sarbanes-Oxley Act of 2002; the Federal False
Claims Act; the New Jersey Law Against Discrimination; the New Jersey Domestic Partnership Act; the
New Jersey Conscientious Employee Protection Act; the New Jersey Family Leave Act; the New Jersey
Wage and Hour Law; the New Jersey Equal Pay Law; the New Jersey Occupational Safety and Health Law;
the New Jersey Smokers’ Rights Law; the New Jersey Genetic Privacy Act; the New Jersey Fair Credit
Reporting Act; the retaliation provisions of the New Jersey Workers’ Compensation Law (and
including any and all amendments to the above) and/or any other alleged violation of any federal,
state or local law, regulation or ordinance, and/or contract or implied contract or tort law or
public policy or whistleblower claim, having any bearing whatsoever on your employment by and the
termination of your employment with the Company, including, but not limited to, any claim for
wrongful discharge, back pay, vacation pay, sick pay, wage, commission or bonus payment, attorneys’
fees, costs, and/or future wage loss.

4. You understand that the consideration provided to you under the terms of this Agreement
does not constitute an admission by the Company that it has violated any law or legal obligation.

5. You agree, to the fullest extent permitted by law, that you will not commence, maintain,
prosecute or participate in any action or proceeding of any kind against the Company based on any
of the claims waived herein occurring up to and including the date of your signature. You
represent and warrant that you have not done so as of the effective date of the Agreement.
Notwithstanding the foregoing promise, if you violate this paragraph, you agree to indemnify and
hold harmless the Company from and against any and all costs, attorneys’ fees and other expenses
authorized by law which result from, or are incident to, such violation. This paragraph is not
intended to preclude you from (1) enforcing the terms of this Agreement; (2) challenging the
knowing and voluntary nature of this Agreement; or (3) filing a charge or participating in any
investigation or proceeding conducted by the Equal Employment Opportunity Commission.

6. You further agree to waive your right to any monetary or equitable recovery should any
federal, state or local administrative agency pursue any claims on your behalf arising out of or
related to your employment with and/or separation from employment with the Company and promise not
to seek or accept any award, settlement or other monetary or equitable relief from any source or
proceeding brought by any person or governmental entity or agency on your behalf or on behalf of
any class of which you are a member with respect to any of the claims you have waived.

7. You further represent and warrant that you have not reported any purported improper,
unethical or illegal conduct or activities to any supervisor, manager, department head, Human
Resources representative, any member of the Company’s legal or compliance departments, or any other
representative of the Company, and you have no knowledge of any such improper, unethical or illegal
conduct or activities. Additionally, nothing in this Agreement shall prohibit or restrict you
from: (i) making any disclosure of information required by law; (ii) providing information to, or
testifying or otherwise assisting in any investigation or proceeding brought by, any federal or
state regulatory or law enforcement agency or legislative body, any self-regulatory
organization, or the Company’s Legal or Compliance Departments; or (iii) testifying,
participating in or otherwise assisting in a proceeding relating to an alleged violation of the
Sarbanes-Oxley Act of 2002, any federal, state or municipal law relating to fraud or any rule or
regulation of any self-regulatory organization.

8. Until this Agreement has been publicly disclosed by the Company, you agree to keep
confidential all information contained in this Agreement and relating to this Agreement, except (1)
to the extent the Company consents in writing to such disclosure; (2) if you are required by
process of law to make such disclosure and you promptly notify the Company of your receipt of such
process; or (3) because you must disclose certain terms to your financial consultant, attorney or
spouse.

9. In addition, during the course of your employment with the Company, you acknowledge that
you acquired certain confidential and proprietary information regarding the Company, including,
without limitation, trade secrets, customer lists, information relating to the sources of
customers, financial, personnel, and customer information, and any confidential information
concerning the business or affairs of any supplier, creditor, lender, shareholder or customer of
the Company or any of its affiliates. You agree to keep strictly confidential any such
confidential information of the Company which you acquired in connection with your employment. You
acknowledge that you will fully comply with paragraphs 4, 5, 6, 8 and 9 of your January 5, 1998
Employment Agreement, as amended, a copy of which is annexed hereto and incorporated herein. You
further agree that the time period referenced in paragraph 4(b) shall be modified from one year to
eighteen (18) months, to commence on April 1, 2005 and conclude on September 30, 2006.

10. You agree to return promptly to the Company all Company property, including, without
limitation, all access passes, keys, laptops, hardware, software, files, papers, memoranda,
letters, handbooks, manuals and customer lists in your possession (provided, however, that any cell
phones, blackberries, laptops and software loaded on such laptops may be retained by you for the
term of the Consulting Agreement). You agree to be reasonably available to the Company and its
counsel in connection with any threatened, actual or future litigation involving the Company,
whether administrative, civil or criminal in nature, in which and to the extent your availability
is deemed necessary by the Company in its discretion, subject to reimbursement of your reasonable
expenses. You agree to render such cooperation in a timely manner on reasonable notice from the
Company.

11. You agree that you will not publicly or privately disparage the Company or any of the
Company’s products, services, divisions, affiliates, related companies or current or former
officers, directors, employees, agents, administrators, representatives or fiduciaries or take any
action which could reasonably be expected to adversely affect the reputation of the Company or the
personal or professional reputation of the Company’s current or former officers, directors,
employees, agents, administrators, representatives or fiduciaries. The Company agrees that it will
not publicly or privately disparage you or take any action which could reasonably be expected to
adversely affect your personal or professional reputation.

12. It is understood that you will have up to twenty-one (21) days from the date you receive
this Agreement to consider its terms and return it to the Company. During this twenty-one (21) day
period and before signing below, you are encouraged to consult with an attorney regarding the terms
of this Agreement, at your own expense. The terms of the offer set forth herein will expire at the
conclusion of the twenty-one (21) day period, if not accepted during that period of time. You may
sign the Agreement prior to the conclusion of the twenty-one (21) day period. If you elect to do
so, you acknowledge that you have done so voluntarily. Your signature below indicates that you are
entering into this Agreement freely, knowingly and voluntarily, with a full understanding of its
terms. You also acknowledge that you will have seven (7) days from the date you sign this
Agreement to revoke the Agreement by notifying the Company in writing prior to the expiration of
the seven (7) day period.

13. This Agreement constitutes and contains the complete understanding between you and the
Company with respect to the subject matter addressed in this Agreement, and supersedes and replaces
all prior negotiations and all agreements, if any, whether written or oral, concerning the subject
matter of this Agreement, except for (1) the Consulting Agreement; and (2) paragraphs 4 (as
modified herein), 5, 6, 8 and 9 of the January 5, 1998 Employment Agreement, as amended. In
addition, your execution of a General Release at the conclusion of the consulting term (or any
failure by you to do so) shall not affect the validity of this Agreement. The parties have
executed this Agreement with full knowledge of any and all rights they may have, and they hereby
assume the risk of any mistake in fact in connection with the true facts involved, or with regard
to any facts which are now unknown to them.

14. This Agreement shall be construed and enforced in accordance with, and governed by, the
laws of the State of New Jersey, without regard to principles of conflict of laws. If any clause
of this Agreement should ever be determined to be unenforceable, it is agreed that this will not
affect the enforceability of any other clause or the remainder of this Agreement.

15. All notices and communications that are required or permitted to be given hereunder
shall be in writing and shall be deemed to have been given when delivered personally or upon
mailing by registered or certified mail, postage prepaid, return receipt requested, as follows (or
to such other address as either party may notify the other in the future):

If to the Company, to:

Memory Pharmaceuticals Corp.

100 Philips Parkway

Montvale, New Jersey 07645

Attn: Vice President Legal Affairs

If to Dr. Axel J. Unterbeck, to:

16. By signing this Agreement, you acknowledge that: (1) you have read this Agreement
completely; (2) you have had an opportunity to consider the terms of this Agreement; (3) you have
had the opportunity to consult with an attorney of your choosing prior to executing this Agreement
to explain the Agreement and its consequences; (4) you know that you are giving up important legal
rights by signing this Agreement; (5) you have not relied on any representation or statement not
set forth in this Agreement; (6) you understand and mean everything that you have said in this
Agreement, and you agree to all its terms; and (7) you have signed this Agreement voluntarily and
entirely of your own free will.

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If you have any questions concerning the terms of our offer, please do not hesitate to contact
the Company. Regardless of your decision, we wish you much success and happiness in your future
endeavors.

MEMORY PHARMACEUTICALS CORP.

By: /S/ Tony Scullion

Tony Scullion, Chief Executive Officer

OFFER UNDERSTOOD, AGREED AND ACCEPTED:

/S/ Axel J. Unterbeck, Ph.D.

Axel J. Unterbeck, Ph.D.

March 15, 2005

Date

Subscribed to and Sworn before me

this 15th day of March, 2005

/S/ Gale R. Cataraso

NOTARY PUBLIC

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EXHIBIT A

[See Exhibit 10.2]

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