2015 Proxy Summary

This summary highlights information contained elsewhere in this proxy statement. This summary does not contain all of the information that you should consider, and you should read the entire proxy statement carefully before voting.

This proxy statement is being distributed and made available on or about April 13, 2015 in connection with the solicitation of proxies by the Board of Directors of Group 1 Automotive, Inc. for use at our 2015 Annual Meeting of Stockholders.

Class I Director Nominees (Proposal 1)

The following table provides summary information about our nominees for election to the Board of Directors. Additional information for all of our directors, including the nominees, may be found beginning on page 18.

The Board recommends a vote "FOR" each Class I director nominee.

Amendment to our Restated Certificate of Incorporation to declassify our Board of Directors (Proposal 2)

We are asking stockholders to approve an amendment to our Restated Certificate of Incorporation to allow directors to be elected by our stockholders on an annual basis. The Board and Nominating/Governance Committee believe that this additional stockholder right is in the best interest of stockholders as it enhances accountability of the Board to stockholders.

The Board of Directors recommends a vote "FOR" the Amendment to our Restated Certificate of Incorporation to declassify our Board.

Frequency of Say-on-Pay Vote

In 2011, our stockholders indicated a preference for an annual "Say-on-Pay" vote. At last year's Annual Meeting of Stockholders, our stockholders approved the compensation of our named executive officers with a substantial majority of our stockholders (93% of votes cast) voting in favor. In evaluating this year's "Say-on-Pay" proposal, we recommend that you review our CD&A, which explains how and why the Compensation Committee arrived at its executive compensation actions and decisions for 2014.

Executive Compensation Advisory Vote (Proposal 3)

We are asking our stockholders to approve, on a non-binding advisory basis, the compensation of our Named Executive Officers. We believe that our compensation policies and practices are effective in achieving our Company's goals of rewarding sustained financial and operating performance, leadership excellence and aligning the executives' long-term interests with those of our stockholders. Our compensation philosophy is to set the fixed compensation of our Named Executive Officers competitively for their demonstrated skills and industry experience. Our variable compensation, both annual and long-term, reflects the results of performance against a combination of quantitative and subjective measures. The Compensation Committee targets the median of the market for all elements of pay, including base salary, annual incentive, long-term incentives and appropriate perquisites.

Set forth below is the 2014 compensation for each Named Executive Officer.

The Board recommends a vote "FOR" the non-binding advisory
approval of our executive compensation.

Approval of the Group 1 Automotive, Inc. Employee Stock Purchase Plan (as Amended and Restated) (Proposal 4)

The purpose of our employee stock purchase plan is to provide an incentive to our employees to purchase a proprietary interest in our Company through their purchase of shares of our common stock. We are asking our stockholders to approve the Group 1 Automotive, Inc. Employee Stock Purchase Plan (as Amended and Restated). We believe that owning shares of our common stock is a retention tool, and directly ties the interests of our employees to the interests of our stockholders. Additional details concerning our employee stock purchase plan can be found on pages 28-33.

The Board recommends a vote "FOR" approval of the
Group 1 Automotive, Inc.
Employee Stock Purchase Plan (as Amended and Restated).

Ratification of Ernst & Young LLP as Independent Registered Public Accounting Firm for 2015 (Proposal 5)

As a matter of good corporate governance, we are asking our stockholders to ratify the selection of Ernst & Young LLP as our independent registered public accounting firm for 2015. Set forth below is summary information with respect to Ernst & Young's fees for services provided in 2013 and 2014.

The Board recommends a vote "FOR" ratification of
Ernst & Young LLP as our independent registered public accounting firm for 2015.

Our Annual Meeting will be held at Sterling McCall Lexus, 10025 Southwest Freeway, Houston, TX 77074, on Tuesday, May 19, 2015, at 10:00 a.m., Central Daylight Time, or at such other time and place to which the meeting may be adjourned.

References in this proxy statement to the Annual Meeting also refer to any adjournments, postponements or changes in location of the meeting, to the extent applicable.

The proxy materials, including this proxy statement, the Notice of Annual Meeting, a proxy card, and our Annual Report to Stockholders for the fiscal year ended December 31, 2014 were mailed to stockholders on or about April 13, 2015.

The Notice of Internet Availability provides instructions on how to inform us to send future proxy materials to you electronically by e-mail or in printed form by mail. If you choose to receive future proxy materials by e-mail, you will receive an

e-mail next year with instructions containing a link to those materials and a link to the proxy voting site. Your election to receive proxy materials by e-mail or printed form will remain in effect until you terminate it.

Choosing to receive future proxy materials by e-mail will allow us to provide you with the information you need in a timelier manner, save us the cost of printing and mailing documents to you, and conserve natural resources.

At our Annual Meeting, stockholders will act upon the matters outlined in the notice of meeting, including the election of two Class I directors, the amendment to our Restated Certificate of Incorporation to declassify our Board of Directors, the advisory vote to approve executive compensation, the approval of the Group 1 Automotive, Inc. Employee Stock Purchase Plan,

and the ratification of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2015, and the consideration of any other matters properly presented at the meeting. In addition, senior management will report on our business and financial performance during fiscal year 2014 and respond to your questions.

Only our stockholders as of 5:00 p.m., Central Daylight Time, on March 23, 2015 (the record date) are entitled to receive notice of the Annual Meeting and to vote at the meeting. On March 23, 2015,

there were 24,279,051 shares of Group 1 common stock issued and outstanding and entitled to vote at the meeting.

You are entitled to one vote for each share of Group 1 common stock you owned at 5:00 p.m.,

Central Daylight Time, on March 23, 2015, on all matters presented at the meeting.

If your shares are registered directly in your name with our registrar and transfer agent, American Stock Transfer & Trust Company, LLC, you are considered a stockholder of record with respect to

those shares. If your shares are held in a brokerage account or by a bank or other nominee, you are considered the "beneficial owner" of those shares, and your shares are held in "street name."

If you are a stockholder of record on the record date, you may vote in person at the Annual Meeting or by proxy using any of the following methods:

Internet — visit the website shown on the proxy card (www.proxyvote.com) and follow the instructions at that website at any time prior to 11:59 p.m., Eastern Daylight Time, on May 18, 2015;

Telephone — within the U.S. or Canada, call the toll-free telephone number shown on the proxy card or and follow the instructions at any time prior to 11:59 p.m., Eastern Daylight Time, on May 18, 2015; or

Mail — if you receive a paper copy of the proxy materials, complete, sign and date the proxy card and return the proxy card in the prepaid envelope. Your proxy card must be received by the Company before the voting polls close at the Annual Meeting.

If you vote by Internet or telephone, do not return your proxy card. The telephone and Internet voting procedures are designed to authenticate stockholders' identities, to allow stockholders to give their voting instructions and to confirm that stockholders' instructions have been recorded properly. Submitting your proxy by Internet or telephone will not affect your right to vote in person should you decide to attend the Annual

Meeting. If you want to vote in person at the meeting, you must request a ballot. For directions to the Annual Meeting visit www.sterlingmccalllexus.com/HoursAndDirections.

If you hold your shares in street name, you will receive instructions from your broker, bank or other nominee describing how to vote your shares. Beneficial owners voting by telephone or Internet

are subject to the same deadlines as described above for holders of record. If you want to vote in person, you must obtain a legal proxy from your broker, bank or other nominee and bring it to the meeting.

If you hold common stock in BOTH street name and as a stockholder of record, YOU MUST VOTE SEPARATELY for each position of common stock.

If you are a stockholder of record on the record date, you can revoke your proxy prior to the completion of voting at the Annual Meeting by:

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delivering an executed, later-dated proxy that is received by the Corporate Secretary of the Company before the voting polls close at the Annual Meeting;

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resubmitting your proxy by Internet or telephone at any time prior to 11:59 p.m., Eastern Daylight Time, on May 18, 2015;

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delivering a written notice of revocation of the proxy to Beth Sibley, Corporate Secretary, Group 1 Automotive, Inc., 800 Gessner,

Suite 500, Houston, Texas 77024 no later than May 18, 2015; or

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voting in person at the Annual Meeting.

Only your latest dated proxy we receive prior to the Annual Meeting will be counted. Further, your attendance at the Annual Meeting will not automatically revoke your proxy.

If you are a street name stockholder you must follow the instructions of your broker, bank or other nominee to revoke your voting instructions. You may also vote in person at the Annual Meeting if you obtain a legal proxy from your broker, bank or other nominee.

If you hold your shares in "street name," you will receive instructions from your broker, bank or other nominee describing how to vote your shares. If you do not instruct your broker, bank or other nominee how to vote your shares, they may vote your shares as they decide as to each routine matter under the rules of the New York Stock Exchange.

If you do not provide specific voting instructions to your broker on non-routine matters, your broker may not cast a vote on the proposal, resulting in a broker non-vote. Although any broker non-vote would be counted as present at the meeting for

purposes of determining a quorum, it would be treated as not entitled to vote with respect to non-routine matters. If you are a beneficial owner holding shares through a broker, bank or other nominee and you do not vote on certain matters, your broker may cast a vote on your behalf for Proposal No. 5, but may not cast a vote on Proposals No. 1, 2, 3 or 4. Abstentions occur when stockholders are present at the Annual Meeting but fail to vote or voluntarily withhold their vote for any of the matters upon which the stockholders are voting.

The Company's majority voting policy requires any director nominee in an uncontested election who receives a greater number of votes "withheld" than votes "for" his or her election to tender his or her resignation promptly following the certification of the election results. The Nominating/Governance Committee of the Board will consider all of the relevant facts and circumstances and make a recommendation to the Board with respect to whether to accept the resignation. Within 90 days, the Board is required to take action with respect to the recommendation and to promptly disclose its decision. The majority voting policy is more fully described in "Information about Our Board of Directors and Its Committees — Majority Voting Policy."

Our Board has appointed Earl J. Hesterberg, our President and Chief Executive Officer, and John C. Rickel, our Senior Vice President and Chief Financial Officer, as the management proxy holders for the Annual Meeting. If you are a stockholder of record, your shares will be voted by the management proxy holders in accordance with the instructions on the proxy card you submit by mail, or the instructions provided for any proxy submitted by telephone or Internet, as applicable. For stockholders who have their shares voted by duly submitting a proxy by mail, telephone or Internet, the management proxy holders will vote all shares represented by such valid proxies as our Board recommends, unless a stockholder appropriately specifies otherwise.

Our Board of Directors recommends that you vote your shares "FOR" each of the Class I director nominees; "FOR" the proposal to amend our Restated Certificate of Incorporation to declassify our Board; "FOR" the approval, on a non-binding advisory basis, of our executive compensation;

"FOR" approval of the Group 1 Automotive, Inc. Employee Stock Purchase Plan; and "FOR" the ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for 2015.

We need a quorum with respect to each proposal being submitted for stockholder vote. A quorum will be present for purposes of proposals 1, 3, 4 and 5 if the holders of a majority of the shares of common stock entitled to vote are present in person or represented by proxy at the Annual Meeting. A quorum exists for purposes of proposal 2 when holders of at least 80% of the outstanding shares of the common stock are present in person or represented by proxy at the Annual Meeting. Our independent inspector of election, Broadridge Financial Solutions will determine whether or not a quorum is present. There must be a quorum for the Annual Meeting to be held. Proxies received but marked as abstentions or broker non-votes will be included in the calculation of votes considered to be present at the Annual Meeting.

If less than a quorum is represented at the meeting, a majority of the shares so represented may adjourn the meeting from time to time without further notice, and the persons named as proxies

will vote the proxies they have been authorized at the Annual Meeting in favor of such an adjournment.

In the event a quorum is present at the Annual Meeting but sufficient votes to approve any of the items proposed by our Board have not been received, the persons named as proxies may propose one or more adjournments of the meeting to permit further solicitation of proxies. A stockholder vote may be taken on one or more of the proposals in this proxy statement prior to such adjournment if sufficient proxies have been received and it is otherwise appropriate. Any adjournment will require the affirmative vote of the holders of a majority of those shares of common stock represented at the meeting in person or by proxy. If a quorum is present, the persons named as proxies will vote the proxies they have been authorized to vote on any other business properly before the meeting in favor of such an adjournment.

We have engaged Alliance Advisors to assist with the solicitation of proxies for a fee not to exceed $5,000, plus reimbursement for reasonable out-of-pocket expenses. We will bear all expenses of soliciting proxies. We may reimburse brokerage firms, custodians, nominees, fiduciaries and other persons representing beneficial owners of our common stock for their reasonable expenses in

forwarding solicitation material to such beneficial owners. Directors, officers and employees of Group 1 may also solicit proxies in person or by other means of communication. Such directors, officers and employees will not be additionally compensated but may be reimbursed for reasonable out-of-pocket expenses in connection with such solicitation.

We have engaged Broadridge Financial Solutions to tabulate the votes and to serve as inspector of election at the Annual Meeting for a fee of approximately $3,500. Broadridge will separately

tabulate For, Against and Withhold votes, abstentions and broker non-votes. Broadridge will also certify the election results and perform any other acts required by the Delaware General Corporation Law.

You may submit proposals for consideration at future stockholder meetings, including director nominations. Please read "Stockholder Proposals for 2016 Annual Meeting" for information regarding

the submission of stockholder proposals and director nominations for consideration at next year's Annual Meeting.

In 2014, the Board held 10 meetings and acted by unanimous written consent nine times. Committees of the Board held a combined total of 21 meetings. Each incumbent director attended 98% or more of the aggregate of all meetings of the Board and the committees on which he or she served during 2014, and, except for two directors who were unable to attend one Board meeting, attendance at such meetings was 100% for all directors. Under our Corporate Governance Guidelines, our directors are encouraged to attend the Annual Meeting of our stockholders. All of the then-sitting

directors attended our 2014 Annual Meeting of Stockholders. We currently expect all of our directors standing for election to be present at the 2015 Annual Meeting.

Our Board and each of its committees annually conduct a self-evaluation to assess, and identify opportunities to improve, their respective performance. The Nominating/Governance Committee leads our Board in its annual self-evaluation.

We are committed to good corporate governance which includes the highest standards of professional and personal conduct. Our Board has adopted several governance documents to guide the operation and direction of our Board and its committees, which include our Corporate Governance Guidelines, Code of Ethics, Code of Conduct and charters for the Audit Committee,

Compensation Committee, Nominating/Governance Committee and Finance/Risk Management Committee. Each of these documents is available on our website at www.group1auto.com and stockholders may obtain a printed copy, free of charge, by sending a written request to Group 1 Automotive, Inc., 800 Gessner, Suite 500, Houston, TX 77024, Attn: Corporate Secretary.

The Nominating/Governance Committee's charter provides that the committee will annually assess the leadership structure of the Board and recommend a structure to the Board for approval. In 2014, the Nominating/Governance Committee conducted that assessment, and determined that having an independent director serve as non-executive Chairman of the Board continues to be in the best interest of our stockholders at this time. Our Chief Executive Officer is responsible for setting our strategic direction and providing day-to-day leadership, while the Chairman of the

Board sets the agenda for Board meetings, presides over meetings of the full Board and provides guidance to our Chief Executive Officer. We believe this structure ensures a greater role for the independent directors in the oversight of our Company and active participation of the independent directors in setting agendas and establishing priorities and procedures for the work of our Board. We discuss our directors' qualifications and characteristics under "Proposals to be Voted on by Stockholders — Proposal 1 — Election of Directors — Board of Directors."

Our Nominating/Governance Committee is responsible for identifying and recommending to our Board qualified individuals to be nominated to serve on our Board. Our Board's objective is to select individuals that have a demonstrated record

of integrity, sound business judgment, leadership, objectivity, independence of mind, and commitment. In selecting potential Board candidates, our Board seeks independent directors who represent a mix of backgrounds and

experiences that will enhance the quality of our Board's deliberations and decisions. Board membership should reflect diversity in its broadest sense, including persons diverse in perspectives,

personal and professional experiences, geography, gender, and ethnicity. This process has resulted in a Board that is comprised of highly qualified directors that reflect diversity as we define it.

The Board has analyzed the independence of each director. It has affirmatively determined that Ms. Wright and Messrs. Adams, Arnold, Quinn, Strange and Watson (all of our non-employee directors) are independent directors under the New York Stock Exchange's listing standards. As part of its analysis, the Board determined that none of these directors has a material relationship with our

Company. Mr. Hesterberg was determined not to be independent because he is our President and Chief Executive Officer, and Mr. Pereira, who was appointed to the Board following our acquisition of UAB Motors Participações, S.A. ("UAB"), was determined not to be independent because he is our Regional Vice President, Brazil and the Chairman of UAB.

We have in the past, and may, in the future, make donations to various charitable organizations. From time to time, some of our directors, officers and employees have been, and in the future may be,

affiliated with such charities. During the annual independence review, our Board determined that any such affiliations did not impact the independence of our directors.

Under our majority voting policy, in an uncontested election of directors, any nominee who receives a greater number of votes "withheld" than votes "for" his or her election will, promptly following the certification of the stockholder vote, tender his or her written resignation to the Board for consideration by the Nominating/Governance Committee. The Nominating/Governance Committee will consider the resignation and will make a recommendation to the Board concerning whether to accept or reject it.

In determining its recommendation to the Board, the Nominating/Governance Committee will consider all factors it considers relevant, which may include:

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the stated reason or reasons why stockholders who cast withhold votes for the director did so;

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the qualifications of the director; and

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the results of the most recent evaluation of the tendering director's performance by the Nominating/Governance Committee and other members of the Board.

Under our majority voting policy, the Board will take formal action on the recommendation no later than 90 days following the certification of the results of the stockholders' meeting. In considering the recommendation, the Board will consider the information, factors and alternatives considered by the Nominating and Governance Committee and any additional information that the Board considers relevant. The Company will promptly disclose the Board's decision whether to accept or reject the director's tendered resignation. If applicable, the Board will also disclose the reason or reasons for rejecting the tendered resignation.

The independent directors meet in executive session at each regularly scheduled meeting of our Board. Mr. Adams, our non-executive Chairman of the Board,

presides over these meetings and is responsible for preparing an agenda for the meetings of the independent directors in executive session.

Our Board, as a whole and through its committees, has broad responsibility for the oversight of risk management as well as specific risk management accountability for governance, overall operational risk, executive compensation, Chief Executive Officer succession planning and our system of internal controls, including financial reporting. In its risk management role, our Board has the responsibility to satisfy itself that our risk management processes and controls are adequate and functioning as designed and that our business is conducted wisely and in compliance with proper governance and applicable laws and regulations.

Much of our Board's oversight work is delegated to various committees, which meet regularly and report back to the full Board. All committees have significant roles in carrying out the risk oversight and management function. Each committee is comprised entirely of independent directors, except the Finance/Risk Management Committee, and is responsible for overseeing risks associated with its respective area of responsibility as further detailed below.

The Finance/Risk Management Committee is charged with oversight of our risk exposure related to our operations, including, among other things, cyber security and data protection and litigation management, enterprise risk management strategies, strategies for our insurance programs and our compliance with material debt instruments. The Finance/Risk Management Committee monitors our finance-related activities and provides guidance to management and the Board concerning our long-range financial policies and objectives.

The Audit Committee is responsible for oversight of Company risks relating to accounting matters, financial reporting (primarily internal control risks)

and legal and regulatory compliance. In fulfilling these oversight responsibilities, the Audit Committee meets with our management and independent registered public accounting firm regarding the adequacy of our financial controls and our compliance with legal, tax and regulatory matters, as well as our significant financial and accounting policies. The Audit Committee also separately meets with our director of internal audit on a regular basis, and with other members of management, as deemed appropriate, to review, among other things, the identified risk areas and scope of the internal audit approach. The Audit Committee receives regular reports regarding the status and findings of audits being conducted by the internal auditors and independent registered public accounting firm, accounting changes that could affect our financial statements and proposed audit adjustments. Further, the Audit Committee chair routinely meets between formal Audit Committee meetings with our chief financial officer, corporate controller, director of internal audit and our independent registered public accounting firm.

The Compensation Committee is responsible for overseeing risks relating to employment policies, our compensation policies and programs and our benefits systems. To assist it in satisfying these oversight responsibilities, from time to time the Compensation Committee has retained its own compensation consultant and meets regularly with management to understand the financial, human resources and stockholder implications of compensation decisions being made. A separate discussion regarding the risk considerations in our compensation programs, including the processes that are put in place by the Compensation Committee and management to identify, manage and mitigate potential risks in compensation, can be found on page 51 of this proxy statement.

The Nominating/Governance Committee is responsible for oversight of risks relating to succession planning for our Chief Executive Officer and other key officers, our corporate governance guidelines and practices and our corporate compliance program. To satisfy these oversight responsibilities, the Committee receives regular reports from our officers that are responsible for each of these areas on matters such as progress against succession planning programs and goals that could affect our operations. In addition, on an annual basis, the Nominating/Governance Committee conducts a review of the performance of the Board and its committees and reviews and reassesses the adequacy of the corporate governance guidelines and recommends any proposed changes to the Board.

In addition to reports from its committees, our Board receives regular reports directly from the officers responsible for oversight of particular risks within our Company. Specifically, our officers report

to our Board regarding the Enterprise Risk Management Program that management has implemented to assess, manage and monitor areas of risk that are significant to our business, including safety and risk, strategic planning and operational risk, financial and accounting risk, and governance, regulatory and legislative risk. Risk profiles are updated annually to insure that all risks continue to be identified. Our officers also report to our Board on which risks management has assessed as the most significant, together with management's plans to mitigate those risks. Further, our outside counsel reports in person to our Board periodically on an as-needed basis to keep our directors informed concerning legal risks and other legal matters involving our Company. Finally, we have robust internal audit systems in place to review adherence to policies and procedures, which are supported by a separate internal audit department.

M — Member
C — Chairman

Pursuant to its charter, the purposes and responsibilities of our Audit Committee are to:

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oversee the quality, integrity and reliability of the financial statements and other financial information we provide to any governmental body or the public;

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oversee our compliance with legal and regulatory requirements;

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oversee the qualifications, performance and independence of our independent registered public accounting firm;

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oversee the performance of our internal audit function;

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oversee our systems of internal controls regarding finance, accounting, legal compliance and ethics that our management and our Board have established;

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provide an open avenue of communication among our independent registered public accounting firm, financial and senior management, the internal auditing department, and our Board, always emphasizing that the independent registered public accounting firm is accountable to the Audit Committee; and

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perform such other functions as our Board may assign to the Audit Committee from time to time.

In addition to, and in connection with, the purposes and responsibilities described above, the Audit Committee is directly responsible for the appointment, compensation, retention and oversight of the work of our independent registered public accounting firm. The Audit Committee also reviews our annual and quarterly financial statements and confirms the independence of our independent registered public accounting firm.

While the Audit Committee has the responsibilities and powers set forth in its charter, it is not the duty of the Audit Committee to plan or conduct audits, to determine that our financial statements are complete and accurate, or to determine that such statements are in accordance with accounting

principles generally accepted in the United States and other applicable rules and regulations. Our management is responsible for the preparation of our financial statements in accordance with accounting principles generally accepted in the United States and our internal controls. Our independent registered public accounting firm is responsible for the audit work on our financial statements. It is also not the duty of the Audit Committee to conduct investigations or to assure compliance with laws and regulations and our policies and procedures. Our management is responsible for compliance with laws and regulations and compliance with our policies and procedures.

All members of the Audit Committee are independent as that term is defined in the New York Stock Exchange's (the "NYSE") listing standards and by Rule 10A-3 promulgated under the Securities Exchange Act of 1934 (the "Exchange Act"). Our Board has determined that each member of the Audit Committee is financially literate and that Mr. Strange has the necessary accounting and financial expertise to serve as Chairman. Mr. Strange also serves on the Audit Committees of New Jersey Resources Corporation, Newfield Exploration Company and BBVA Compass. Our Board has determined that Mr. Strange's simultaneous service on these other Audit Committees and our Audit Committee does not impair his ability to serve effectively on our Audit Committee.

Our Board has also determined that Mr. Strange is an "audit committee financial expert" following a determination that Mr. Strange met the criteria for such designation under the Securities and Exchange Commission's ("SEC") rules and regulations. For information regarding Mr. Strange's business experience, please read "Proposal 1 — Election of Directors — Board of Directors." The Audit Committee held eight meetings during 2014, with all members attending.

The Report of the Audit Committee is set forth on page 36 of this proxy statement.

Pursuant to its charter, the purposes and responsibilities of our Compensation Committee are to:

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review, evaluate, and approve our agreements, plans, policies, and programs to compensate our senior corporate officers;

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review and discuss with our management the Compensation Discussion and Analysis to be included in our proxy statement for the Annual Meeting of Stockholders and to determine whether to recommend to our Board that the Compensation Discussion and Analysis be included in the proxy statement, in accordance with applicable rules and regulations;

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produce the Compensation Committee Report for inclusion in the proxy statement, in accordance with applicable rules and regulations;

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otherwise discharge our Board's responsibility relating to compensation of our senior corporate officers; and

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perform such other functions as our Board may assign to the Compensation Committee from time to time.

In connection with these purposes, our Board has entrusted the Compensation Committee with the overall responsibility for establishing, implementing and monitoring the compensation for our senior corporate officers (our executive officers and officers that report directly to our Chief Executive Officer). The Compensation Committee reviews and approves the compensation of our senior corporate officers and makes appropriate adjustments based on Company performance, achievement of predetermined goals and changes in an officer's duties and responsibilities. The Compensation Committee also approves all employment agreements related to the senior corporate officers and approves recommendations regarding equity awards for all employees. Together with management, and any counsel or other advisors deemed appropriate by the

Compensation Committee, the Compensation Committee typically reviews and discusses the particular executive compensation matter presented and makes a final determination, with the exception of compensation matters relating to our Chief Executive Officer. In the case of our Chief Executive Officer, the Compensation Committee reviews and discusses the particular compensation matter (together with our management and any counsel or other advisors deemed appropriate) and formulates a recommendation. The Compensation Committee's Chairman then generally reports the Compensation Committee's recommendation for approval by the full Board or, in certain cases, by the independent directors.

In general, executive compensation matters are presented to the Compensation Committee or raised with the Compensation Committee in one of the following ways: (1) at the request of the Compensation Committee Chairman or another Compensation Committee member or member of our Board, (2) in accordance with the Compensation Committee's agenda, which is reviewed by the Compensation Committee members and other directors on an annual basis, (3) by our Chief Executive Officer or Vice President of Human Resources or (4) by the Compensation Committee's outside compensation consultant.

The Compensation Committee works with the management team, our Chief Executive Officer and our Vice President of Human Resources to implement and promote our executive compensation strategy. The most significant aspects of management's involvement in this process are:

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preparing materials in advance of Compensation Committee meetings for review by the Compensation Committee members;

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evaluating executive performance;

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establishing our business goals; and

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recommending the compensation arrangements and components for our executives.

Our Chief Executive Officer is instrumental to this process. Specifically, the Chief Executive Officer assists the Compensation Committee by:

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evaluating senior corporate officer performance;

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providing background information regarding our business goals; and

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recommending compensation arrangements and components for our senior corporate officers (other than himself).

In addition, our Vice President of Human Resources is involved in the executive compensation process by:

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providing the necessary compensation information to, and acting as our liaison with, the compensation consultant;

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updating and modifying compensation plan policies, guidelines and materials, as needed; and

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providing recommendations to the Compensation Committee and our Chief Executive Officer regarding compensation structure, awards and plan design changes.

Under its charter, the Compensation Committee has the sole authority to retain and terminate any compensation consultant to be used to assist in the evaluation of the compensation of our senior corporate officers and our directors and also has the sole authority to approve the consultant's fees and other retention terms. To the extent permitted by applicable law, the Compensation Committee may delegate some or all of its authority to subcommittees as it deems appropriate.

During 2014, the Compensation Committee engaged Pearl Meyer & Partners ("PM&P") to conduct a compensation analysis which involved the comparison of long-term, short-term and total compensation of our Named Executive Officers with a selected group of peer companies. We generally compare compensation data at the 25th, 50th and 75th percentiles of the market and engage PM&P to review our analysis. While we do not think it is appropriate to establish compensation based solely on benchmarking, we believe that this practice is useful for two reasons.

First, our compensation practices must be competitive in order to attract and retain executives with the ability and experience necessary to provide leadership and to deliver strong performance to our stockholders. Second, benchmarking allows us to assess the reasonableness of our compensation practices. This process allows us to achieve one of our primary objectives of maintaining competitive compensation to ensure retention when justified and rewarding the achievement of Company objectives so as to align with stockholder interest. PM&P is an independent compensation consulting firm and does not provide any other services to us outside of matters pertaining to executive officer and director compensation. PM&P reports directly to the Compensation Committee, which is the sole party responsible for determining the scope of services performed by PM&P and the directions given to PM&P regarding the performance of such services.

In February 2015, the Compensation Committee considered the independence of PM&P in light of SEC rules and listing standards of the NYSE. The Compensation Committee requested and received a letter from PM&P addressing the consulting firm's independence, including the following factors: (1) other services provided to us by the consultant; (2) fees paid by us as a percentage of the consulting firm's total revenue; (3) policies or procedures maintained by the consulting firm that are designed to prevent a conflict of interest; (4) any business or personal relationships between the individual consultants involved in the engagement and a member of the Compensation Committee; (5) any company stock owned by the individual consultants involved in the engagement; and (6) any business or personal relationships between our executive officers and the consulting firm or the individual consultants involved in the engagement. The letter highlighted three additional factors that supported their independence: (1) PM&P has regular discussions with only the Compensation Committee (or select members of the Compensation Committee) present and where

PM&P interacts with management, it is at the Compensation Committee Chair's request and/or with the Chair's knowledge and approval, (2) PM&P has not provided any gifts, benefits, or donations to our Company or received any gifts, benefits, or donations from our Company and (3) PM&P is bound by strict confidentiality and information sharing protocols. The Compensation Committee discussed these considerations, among other things, and concluded that the work of PM&P did not raise any conflict of interest.

All members of the Compensation Committee are independent as that term is defined in the NYSE's listing standards. The Compensation Committee held five meetings during 2014 and all incumbent members were in attendance.

The Report of the Compensation Committee is set forth on page 52 of this proxy statement.

Pursuant to its charter, the purposes and responsibilities of our Nominating/Governance Committee are to:

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assist our Board by identifying individuals qualified to become members of our Board and recommend director nominees to our Board for election at the Annual Meetings of stockholders or for appointment to fill vacancies;

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recommend to our Board the appropriate composition of our Board and its committees and Board committee membership and leadership;

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advise our Board about and recommend to our Board appropriate corporate governance guidelines and practices and assist our Board in implementing those guidelines and practices;

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lead our Board in its annual review of the performance of our Board and its committees;

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direct all matters relating to the succession of our Chief Executive Officer and other key officers of the Company; and

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perform such other functions as our Board may assign to the Nominating/Governance Committee from time to time.

In connection with these purposes, the Nominating/Governance Committee actively seeks individuals qualified to become members of our Board, seeks to implement the independence standards required by law, applicable listing standards, our Restated Certificate of Incorporation, our Amended and Restated Bylaws and our Corporate Governance Guidelines, and

identifies the qualities and characteristics necessary for an effective Chief Executive Officer.

In considering candidates for our Board, the Nominating/ Governance Committee will consider the entirety of each candidate's credentials. There is currently no set of specific minimum qualifications that must be met by a nominee recommended by the Nominating/Governance Committee, as different factors may assume greater or lesser significance at particular times and the needs of our Board may vary in light of its composition and the Nominating/Governance Committee's perceptions about future issues and needs. However, while the Nominating/Governance Committee does not maintain a formal list of qualifications, in making its evaluation and recommendation of candidates, the Nominating/Governance Committee may consider, among other factors, diversity, age, skill, experience in the context of the needs of our Board, independence qualifications, moral character and whether prospective nominees have relevant business and financial experience or have industry or other specialized expertise.

The Nominating/Governance Committee may consider candidates for our Board from any reasonable source, including from a search firm engaged by the Nominating/Governance Committee or stockholder recommendations, provided that the procedures set forth below are followed. The Nominating/Governance Committee does not intend to alter the manner in which it evaluates candidates based on whether the

candidate is recommended by a stockholder or not. However, in evaluating a candidate's relevant business experience, the Nominating/Governance Committee may consider previous experience as a member of our Board. Any invitation to join our Board must be extended by our Board as a whole, by the Chairman of the Nominating/Governance Committee and by the Chairman of the Board.

Stockholders or a group of stockholders may recommend potential candidates for consideration by the Nominating/Governance Committee. For additional information on such requests and the applicable timing, please see "Stockholder Proposals for 2016 Annual Meeting."

In addition to the purposes described above, our Board has entrusted the Nominating/Governance Committee with the responsibility for establishing, implementing and monitoring the compensation for our directors. The Nominating/Governance Committee establishes, reviews and approves the

compensation of our directors and makes appropriate adjustments based on Company performance, duties and responsibilities of the directors and competitive environment. The Nominating/Governance Committee's primary objectives in establishing and implementing director compensation are to:

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ensure the ability to attract, motivate and retain the talent necessary to provide qualified Board leadership; and

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use the appropriate mix of long-term and short-term compensation to ensure high Board/committee performance.

All members of the Nominating/Governance Committee are independent as defined under the NYSE's listing standards. The Nominating/Governance Committee held four meetings during 2014, and all incumbent members were in attendance.

Pursuant to its charter, the purposes of our Finance/Risk Management Committee are to:

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review, oversee and report to our Board regarding our financial status and capital structure, debt and equity financings, cash management and other banking activities, compliance with covenants of material debt instruments, investor/stockholder relations, relationships with various financial constituents and securities repurchase activities, and authorize transactions related thereto within limits prescribed by our Board;

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review and assess risk exposure and insurance related to our operations and authorize transactions within limits prescribed by our Board; and

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review capital expenditures and other capital spending plans, including significant acquisitions and dispositions of business or assets, and authorize transactions within limits prescribed by our Board.

In connection with these purposes, the Finance/Risk Management Committee reviews periodically our financial status and capital structure and can authorize finance-related activities within limits prescribed by our Board. The Finance/Risk Management Committee reviews with management the status of current litigation matters and regularly reports to our Board on litigation and contingent liabilities. The Finance/Risk Management Committee also consults with management on matters that could have a significant financial impact on our Company and reviews our financial policies and procedures, our compliance with material debt instruments and our significant banking relationships. In addition, the Finance/Risk Management Committee reviews and assesses periodically the risk exposure of our operations and plans and strategies for insurance programs, and authorizes risk management-related activities within limits prescribed by our Board. The Finance/Risk Management Committee also provides direction for the assessment of future capital

spending and acquisition opportunities and reviews capital expenditure plans, including significant acquisitions and dispositions of businesses and assets and other specific capital projects.

At the request of the Finance/Risk Management Committee, management developed and presented to the Board a robust Enterprise Risk Management Program, concentrating primarily in four principal areas that are significant to our business: (1) safety and risk; (2) strategic planning and operational risk; (3) financial and accounting risk; and (4) governance, regulatory and legislative risk. Risk profiles are updated annually to insure that all risks continue to be identified. Management updates the

Finance/Risk Management Committee as new risks are identified, and the steps taken to mitigate such risks. On an annual basis, management reviews the testing results with the full Board and steps taken to mitigate new risks which have been identified.

All members of the Finance/Risk Management Committee, except for Mr. Hesterberg, our President and Chief Executive Officer and Mr. Pereira, our Regional Vice President, Brazil, are independent as defined under the NYSE's listing standards. The Finance/Risk Management Committee held four meetings during 2014, and all members were in attendance.

Our Board welcomes communications from our stockholders and other interested parties. Stockholders and any other interested parties may send communications to our Board, to any committee of our Board, to the non-executive Chairman of the Board (who presides over the executive sessions of our independent and non-management directors), or to any director in particular, to:

c/o Group 1 Automotive, Inc.
800 Gessner, Suite 500
Houston, Texas 77024

Any correspondence addressed to our Board, to any committee of our Board, to the non-executive Chairman of the Board, or to any one of the directors in care of our offices is required to be forwarded to the addressee or addressees without review by any person to whom such correspondence is not addressed.

Our Restated Certificate of Incorporation ("Certificate") and Amended and Restated Bylaws ("Bylaws") currently provide for three classes of directors serving staggered three-year terms, each to hold office until a successor is elected and qualified or until the director's earlier resignation or removal. Our Board is recommending that our stockholders approve an amendment to our Certificate to declassify our Board. See "Proposal 2 — Amendment to our Restated Certificate of Incorporation to declassify the Board of Directors." The outcome of that vote will determine whether we declassify the Board and provide for annual elections of directors beginning with the 2016 Annual Meeting, or continue to have a classified Board.

The number of directors on our Board is reviewed annually and fixed by our Board from time to time. In February 2013, the Board approved the number of directors serving on the Board to be eight members. The Board will continue to evaluate the size of the Board and make adjustments as needed to meet the current and future needs of the Company. Based on the recommendation from the Nominating/Governance Committee, our Board has nominated Doyle L. Arnold and Earl J. Hesterberg to serve for one-year terms if stockholders approve the amendment to our Certificate to declassify our Board, or alternatively, for three-year terms expiring in 2018 if stockholders do not approve the amendment to our Certificate to declassify our Board. Each nominee is currently a director. At the February 2015 meeting, we appointed Mr. Arnold as a Class I director on our Board to fill the vacant seat created by the resignation of Ms. Beryl Raff. Mr. Hesterberg was most recently elected to our Board by the stockholders in 2012. The term for our Class II directors currently expires in 2016 and the term for our Class III directors currently expires in 2017.

Stockholders may not cumulate their votes in the election of our directors. Each nominee has consented to being named as a nominee in this proxy statement and has indicated a willingness to serve if elected. If a nominee should become unable or unwilling to serve for any reason (which we do not anticipate), proxies may be voted for

another person nominated as a substitute by our Board, or our Board may reduce its size.

Under Delaware law and our Bylaws, a plurality of the votes cast is required for the election of directors. This means that the director nominee with the most votes for a particular Board position is elected for that position. You may vote "for" or "withheld" with respect to the election of directors. Only votes "for" or "withheld" are counted in determining whether a plurality has been cast in favor of a director. Abstentions are not counted for purposes of the election of directors.

Our majority voting policy requires, in an uncontested election, any nominee for director who receives a greater number of votes "withheld" from his or her election than votes "for" to promptly tender his or her resignation following certification of the election results. The Nominating/Governance Committee will promptly consider the resignation and a range of possible responses based on the circumstances that led stockholders to withhold votes, if known, and make a recommendation to the Board. The Board will act on the committee's recommendation within 90 days following certification of the results of the election.

If the amendment to our Certificate is approved by our stockholders, and Messrs. Arnold and Hesterberg receive a greater number of votes cast in favor of their continued service on the Board, each will serve for one year and his term will expire at the 2016 Annual Meeting. However, if the amendment is not approved by our stockholders, any director serving in Class I who receives a greater number of votes cast in favor of his continued service on the Board will serve the remainder of his term, or until 2018.

If Proposal 2 in this proxy statement is approved by stockholders, our directors will stand for re-election on an annual basis beginning in 2016. For more information regarding the amendment to our Restated Certificate of Incorporation to declassify our Board, please see "Proposal 2 — Amendment to our Restated Certificate of Incorporation to declassify the Board of Directors."