Group 1 Automotive Reports Record Revenues and Gross Profit in the Second Quarter of 2025

— Current quarter diluted earnings per common share from continuing operations of $10.77 and current quarter adjusted diluted earnings per common share from continuing operations (a non-GAAP measure) of $11.52, increases of 6.1% and 17.5%, respectively, over the comparable prior year quarter

— Total revenues and gross profit of $5.7 billion and $935.8 million, both quarterly records, increased 21.4% and 22.1%, respectively, over the comparable prior year quarter

— Parts and service gross profit of $402.8 million (as reported) and $355.1 million (on a same store basis), increased 27.1% and 14.0%, respectively, over the comparable prior year quarter, with strong customer pay same store revenue growth exceeding 13.6% in the U.S. and U.K.

Group 1 Automotive, Inc. (NYSE: GPI)(“Group 1” or the “Company”),a Fortune 250 automotive retailer with 258 dealerships located in the U.S. and U.K., today reported financial results for the second quarter of 2025 (“current quarter”).

“We were pleased with our growth in the second quarter. Same store revenues increased 7.1%. Parts and service was a bright spot in both markets, driven by double digit same store growth in customer pay and a tailwind from warranty. F&I was also a good story, especially in the U.K. where same store gross profit per unit rose over 26%, and we closed on three outstanding dealerships in the U.S.,” said Daryl Kenningham, Group 1's President and Chief Executive Officer.

“The U.K. market continues to be challenging in terms of industry volumes and withBEV mandate-related margin pressures. Integration efforts are largely complete, and most U.K. brands are performing to expectations, with positive momentum anticipated in the second half of the year. SG&A leverage improvement remains a focus in the U.K., with room for further gains.

We'll continue to pursue balanced growth while executing opportunistic share repurchases. Additionally, we're actively reviewing underperforming stores and developing appropriate plans.”

Reconciliations for financial results, non-GAAP metrics and diluted earnings per common share between continuing and discontinued operations are included in the accompanying financial tables.

Current Quarter Results Overview

— Total revenues for the current quarter were $5.7 billion, a 21.4% increase compared to $4.7 billion for the second quarter of 2024 (“prior year quarter”).

— Net income from continuing operations for the current quarter was $139.8 million, a 1.4% increase compared to $137.9 million for the prior year quarter.

— Current quarter adjusted net income from continuing operations (a non-GAAP measure) was $149.6 million, a 12.4% increase compared to $133.1 million for the prior year quarter.

— Current quarter diluted earnings per common share from continuing operations was $10.77, a 6.1% increase compared to $10.15 for the prior year quarter. Current quarter adjusted diluted earnings per common share from continuing operations (a non-GAAP measure) was $11.52, a 17.5% increase compared to $9.80 for the prior year quarter.

Second Quarter2025 Consolidated Same StoreKey Performance Metrics (a non-GAAP(year-over-year comparable period basis) measure)Reported: 2Q25 Change 2Q25 ChangeTotal revenues $5.7B +21.4% $5.0B +7.1%Total gross profit (“GP”) $935.8M +22.1% $831.7M +10.1%NV units sold 55,763 +17.0% 48,565 +3.6%NV GP per retail unit (“PRU”) $3,557 (0.3)% $3,552 (0.5)%Used vehicle (“UV”) retail units sold 60,240 +22.3% 50,968 +4.9%UV retail GP PRU $1,600 (2.3)% $1,653 +1.1%Parts & service (“P&S”) GP $402.8M +27.1% $355.1M +14.0%P&S Gross Margin (“GM”) 56.1% +0.9% 56.0% +0.9%Finance and Insurance (“F&I”) revenues $237.8M +18.8% $219.0M +10.6%F&I GP PRU $2,050 (0.7)% $2,200 +6.0%Selling, General and Administrative (“SG&A”) expenses as a % of GP 69.0% +418 bps 66.6% (55) bpsAdjusted SG&A expenses (a non-GAAP measure) as a % of GP 68.7% +237 bps 66.2% +50 bps

U.K. Update

The Company recognized $7.6 million in restructuring charges in the U.K. in the current quarter, consisting of additional workforce realignment and strategic closing of certain facilities. Year to date, the Company has recognized $18.7 million in U.K. restructuring charges. The Company expects additional less significant activities to occur in 2025, which are intended to further optimize operations and reduce costs.

Corporate Development

During the current quarter, the Company acquired two businesses involving three dealerships located in the U.S. These acquisitions are expected to generate approximately $330 million in annual revenues. Year to date, the Company has successfully acquired and integrated dealership operations with total expected annual revenues of approximately $430 million. The Company remains focused on quickly and efficiently integrating acquisitions into existing operations to drive incremental value creation for shareholders.

During the current quarter, the Company disposed ofone Subaru dealership and one Chrysler Jeep Dodge RAM dealership in the U.S. and closed two Mercedes-Benz dealerships in the U.K. These dealerships generated approximately $175 million in annualized revenues,bringing year-to-date total annualized revenues associated with dealership dispositions and franchise terminations for the Company to $470 million.

Share Repurchases

During the current quarter, the Company repurchased 114,918 shares, at an average price per common share of $387.39, for a total of $44.5million, excluding excise taxes of $0.4million.

During the six months ended June 30, 2025, the Company repurchased 401,649 shares, representing approximately 3.0% of the Company's outstanding common shares at January 1 of the current year, at an average price per common share of $416.62, for a total of $167.3million, excluding excise taxes of $1.1million.

As of June30, 2025, the Company had an aggregate 12.9million outstanding common shares and unvested restricted stock awards. As of June30, 2025, the Company had $308.8million remaining on its Board authorized common share repurchase program.

Future repurchases may be made from time to time, based on market conditions, legal requirements and other corporate considerations in the open market, pursuant to Rule 10b5-1 trading plans or in privately negotiated transactions, and subject to Board approval and covenant restrictions.

Second Quarter2025 Earnings Conference Call Details

Group 1's senior management will host a conference call today at 10:00 a.m. ET to discuss the second quarter 2025 financial results. The conference call will be simulcast live on the Internet at http://www.group1corp.com/events. A webcast replay will be available for 30 days. A copy of the Company's presentation will also be made available at http://www.group1corp.com/company-presentations.

The conference call will also be available live by dialing in 10 minutes prior to the start of the call at:

Domestic: 1-888-317-6003 International: 1-412-317-6061 Passcode: 1534973

A telephonic replay will be available following the call through July 31, 2025, by dialing:

Domestic: 1-877-344-7529 International: 1-412-317-0088 Replay Code: 7076195

ABOUT GROUP 1 AUTOMOTIVE, INC.

Group 1 owns and operates 258 automotive dealerships, 322 franchises, and 39 collision centers in the United States and the United Kingdom that offer 36 brands of automobiles. Through its dealerships and omni-channel platform, the Company sells new and used cars and light trucks; arranges related vehicle financing; sells service contracts; provides automotive maintenance and repair services; and sells vehicle parts.

Group 1 discloses additional information about the Company, its business, and its results of operations at www.group1corp.com, www.group1auto.com, www.group1collision.com, www.acceleride.com, and www.facebook.com/group1auto.

FORWARD-LOOKING STATEMENTS

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, which are statements related to future, not past, events and are based on our current expectations and assumptions regarding our business, the economy and other future conditions. In this context, the forward-looking statements often include statements regarding our strategic investments, goals, plans, projections and guidance regarding our financial position, results of operations and business strategy, including the annualized revenues of recently completed acquisitions or dispositions and other benefits of such currently anticipated or recently completed acquisitions or dispositions. These forward-looking statements often contain words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “should,” “foresee,” “may” or “will” and similar expressions. While management believes that these forward-looking statements are reasonable as and when made, there can be no assurance that future developments affecting us will be those that we anticipate. Any such forward-looking statements are not assurances of future performance and involve risks and uncertainties that may cause actual results to differ materially from those set forth in the statements. These risks and uncertainties include, among other things, (a) general economic and business conditions, (b) the impacts of sustained levels of inflation, (c) developments in U.S. and global trade policy, including the imposition by the U.S. of significant tariffs on the import of automobiles and certain materials used in our parts and services business and the resulting consequences (including, but not limited to, retaliatory tariffs by non-U.S. nations, supply chain disruptions, vehicle and part cost increases and demand decreases, and potential recessions in the U.S. and U.K.), (d) the level of manufacturer incentives, (e) our ability to comply with extensive laws, regulations and policies applicable to our operations, including BEV mandates in the U.K. (f) our ability to obtain an inventory of desirable new and used vehicles (including as a result of changes in the international trade environment), (g) our relationship with our automobile manufacturers and the willingness of manufacturers to approve future acquisitions, (h) our cost of financing and the availability of credit for consumers, (i) our ability to complete acquisitions and dispositions, on a timely basis, if at all and the risks associated therewith, (j) our ability to successfully integrate recent and future acquisitions and realize the expected benefits from consummated acquisitions, (k) foreign exchange controls and currency fluctuations, (l) the armed conflicts in Ukraine and the Middle East, (m) our ability to maintain sufficient liquidity to operate, and (n) a material failure in or breach of our vendors' information technology systems and other cybersecurity incidents. For additional information regarding known material factors that could cause our actual results to differ from our projected results, please see our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date hereof. We undertake no obligation to publicly update or revise any forward-looking statements after the date they are made, whether as a result of new information, future events or otherwise.

NON-GAAP FINANCIAL MEASURES, SAME STORE DATA, AND OTHER DATA

In addition to evaluating the financial condition and results of our operations in accordance with U.S. GAAP, from time to time our management evaluates and analyzes results and any impact on the Company of strategic decisions and actions relating to, among other things, cost reduction, growth, profitability improvement initiatives, and other events outside of normal, or “core,” business and operations, by considering alternative financial measures not prepared in accordance with U.S. GAAP. In our evaluation of results from time to time, we exclude items that do not arise directly from core operations, such as non-cash asset impairment charges, out-of-period adjustments, legal matters, gains and losses on dealership franchise or real estate transactions, and catastrophic events, such as hailstorms, hurricanes and snow storms, and employment compensation costs associated with the cybersecurity incident experienced by third-party software provider, CDK Global LLC in June 2024. Because these non-core charges and gains materially affect the Company's financial condition or results in the specific period in which they are recognized, management also evaluates, and makes resource allocation and performance evaluation decisions based on, the related non-GAAP measures excluding such items. This includes evaluating measures such as adjusted selling, general and administrative expenses, adjusted net income, adjusted diluted earnings per share, and constant currency. These adjusted measures are not measures of financial performance under U.S. GAAP, but are instead considered non-GAAP financial performance measures. Non-GAAP measures do not have definitions under U.S. GAAP and may be defined differently by, and not be comparable to similarly titled measures used by, other companies. As a result, any non-GAAP financial measures considered and evaluated by management are reviewed in conjunction with a review of the most directly comparable measures calculated in accordance with U.S. GAAP. We caution investors not to place undue reliance on such non-GAAP measures, but also to consider them with the most directly comparable U.S. GAAP measures.

In addition to using such non-GAAP measures to evaluate results in a specific period, management believes that such measures may provide more complete and consistent comparisons of operational performance on a period-over-period historical basis and a better indication of expected future trends. Our management also uses these adjusted measures in conjunction with U.S. GAAP financial measures to assess our business, including communication with our Board of Directors, investors, and industry analysts concerning financial performance. We disclose these non-GAAP measures, and the related reconciliations, because we believe investors use these metrics in evaluating longer-term period-over-period performance, and to allow investors to better understand and evaluate the information used by management to assess operating performance. The exclusion of certain expenses in the calculation of non-GAAP financial measures should not be construed as an inference that these costs are unusual or infrequent. We anticipate excluding these expenses in the future presentation of our non-GAAP financial measures.

In addition, we evaluate our results of operations on both an as reported and a constant currency basis. The constant currency presentation, which is a non-GAAP measure, excludes the impact of fluctuations in foreign currency exchange rates. We believe providing constant currency information provides valuable supplemental information regarding our underlying business and results of operations, consistent with how we evaluate our performance. We calculate constant currency percentages by converting our current period reported results for entities reporting in currencies other than U.S. dollars using comparative period exchange rates rather than the actual exchange rates in effect during the respective periods. The constant currency performance measures should not be considered a substitute for, or superior to, the measures of financial performance prepared in accordance with U.S. GAAP. The Same Store amounts presented include the results of dealerships for the identical months in each period presented in comparison, commencing with the first full month in which the dealership was owned by us and, in the case of dispositions, ending with the last full month it was owned by us. Same Store results also include the activities of our corporate headquarters.

Certain amounts in the financial statements may not compute due to rounding. All computations have been calculated using unrounded amounts for all periods presented.

Investor contacts:

Terry Bratton Manager, Investor Relations Group 1 Automotive, Inc. ir@group1auto.com

Media contacts:

Pete DeLongchamps Senior Vice President, Financial Services and Manufacturer Relations Group 1 Automotive, Inc. pdelongchamps@group1auto.com

Kimberly Barta Head of Marketing and Communications Group 1 Automotive, Inc. kbarta@group1auto.com

Jude Gorman / Clayton Erwin Collected Strategies Group1-CS@collectedstrategies.com

Group 1 Automotive, Inc.Condensed Consolidated Statements of Operations(Unaudited)(In millions, except per share data) Three Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)REVENUES:New vehicle retail sales $ 2,735.5 $ 2,364.2 $ 371.3 15.7%Used vehicle retail sales 1,848.2 1,453.2 395.0 27.2%Used vehicle wholesale sales 163.8 104.3 59.5 57.0%Parts and service sales 718.4 574.5 143.8 25.0%Finance, insurance and other, net 237.8 200.1 37.6 18.8%Total revenues 5,703.5 4,696.4 1,007.2 21.4%COST OF SALES:New vehicle retail sales 2,537.1 2,194.1 343.0 15.6%Used vehicle retail sales 1,751.8 1,372.6 379.2 27.6%Used vehicle wholesale sales 163.3 105.4 57.8 54.8%Parts and service sales 315.6 257.7 57.9 22.5%Total cost of sales 4,767.8 3,929.8 837.9 21.3%GROSS PROFIT 935.8 766.5 169.3 22.1%Selling, general and administrative expenses 646.1 497.2 148.9 29.9%Depreciation and amortization expense 28.7 28.2 0.5 1.9%Asset impairments 0.4 – 0.4 100.0%Restructuring charges 7.6 – 7.6 100.0%INCOME FROM OPERATIONS 253.0 241.1 11.8 4.9%Floorplan interest expense 26.4 24.7 1.8 7.1%Other interest expense, net 42.7 33.4 9.3 27.9%Other expense – 0.1 (0.1) (82.2)%INCOME BEFORE INCOME TAXES 183.9 183.0 0.9 0.5%Provision for income taxes 44.0 45.2 (1.1) (2.5)%Net income from continuing operations 139.8 137.9 2.0 1.4%Net income from discontinued operations 0.7 0.3 0.4 134.2%NET INCOME $ 140.5 $ 138.2 $ 2.4 1.7%Less: Earnings allocated to participating securities 1.6 2.9 (1.4) (46.1)%Net income available to diluted common shares $ 139.0 $ 135.2 $ 3.7 2.8%Diluted earnings per share from continuing operations $ 10.77 $ 10.15 $ 0.62 6.1%Diluted earnings per share from discontinued operations $ 0.05 $ 0.02 $ 0.03 144.9%DILUTED EARNINGS PER SHARE $ 10.82 $ 10.17 $ 0.65 6.4%Weighted average dilutive common shares outstanding 12.8 13.3 (0.5) (3.4)%Weighted average participating securities 0.1 0.3 (0.1) (49.3)%Total weighted average shares 13.0 13.6 (0.6) (4.4)%Effective tax rate on continuing operations 24.0% 24.7% (0.7)%

Group 1 Automotive, Inc.Condensed Consolidated Statements of Operations(Unaudited)(In millions, except per share data) Six Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)REVENUES:New vehicle retail sales $ 5,415.4 $ 4,546.8 $ 868.6 19.1%Used vehicle retail sales 3,603.6 2,870.0 733.6 25.6%Used vehicle wholesale sales 315.4 210.3 105.0 49.9%Parts and service sales 1,410.4 1,150.8 259.7 22.6%Finance, insurance and other, net 464.0 389.0 75.0 19.3%Total revenues 11,208.8 9,166.9 2,041.9 22.3%COST OF SALES:New vehicle retail sales 5,027.4 4,217.2 810.2 19.2%Used vehicle retail sales 3,413.7 2,707.2 706.4 26.1%Used vehicle wholesale sales 313.3 212.4 101.0 47.5%Parts and service sales 626.7 520.9 105.8 20.3%Total cost of sales 9,381.1 7,657.7 1,723.4 22.5%GROSS PROFIT 1,827.7 1,509.1 318.6 21.1%Selling, general and administrative expenses 1,263.4 973.3 290.0 29.8%Depreciation and amortization expense 58.0 52.0 6.0 11.5%Asset impairments 0.8 – 0.8 100.0%Restructuring charges 18.7 – 18.7 100.0%INCOME FROM OPERATIONS 486.9 483.8 3.1 0.6%Floorplan interest expense 53.3 45.2 8.1 18.0%Other interest expense, net 82.5 62.7 19.8 31.5%Other income (0.2) (0.4) 0.1 (37.1)%INCOME BEFORE INCOME TAXES 351.4 376.3 (24.9) (6.6)%Provision for income taxes 83.8 91.0 (7.2) (8.0)%Net income from continuing operations 267.6 285.3 (17.7) (6.2)%Net income from discontinued operations 1.0 0.8 0.2 31.6%NET INCOME $ 268.6 $ 286.1 $ (17.4) (6.1)%Less: Earnings allocated to participating securities 3.2 6.3 (3.1) (49.2)%Net income available to diluted common shares $ 265.4 $ 279.8 $ (14.3) (5.1)%Diluted earnings per share from continuing operations $ 20.40 $ 20.91 $ (0.51) (2.5)%Diluted earnings per share from discontinued operations $ 0.08 $ 0.06 $ 0.02 36.9%DILUTED EARNINGS PER SHARE $ 20.48 $ 20.97 $ (0.49) (2.4)%Weighted average dilutive common shares outstanding 13.0 13.3 (0.4) (2.8)%Weighted average participating securities 0.2 0.3 (0.1) (47.9)%Total weighted average shares 13.1 13.6 (0.5) (3.8)%Effective tax rate on continuing operations 23.8% 24.2% (0.3)%

Group 1 Automotive, Inc.Additional Information – Consolidated(Unaudited) June 30, 2025 December 31,2024 Increase/ % Change (Decrease)SELECTED BALANCE SHEET INFORMATION:(In millions)Cash and cash equivalents $ 52.7 $ 34.4 $ 18.3 53.1%Inventories, net $ 2,658.2 $ 2,636.8 $ 21.4 0.8%Floorplan notes payable, net (1) $ 1,945.0 $ 2,022.1 $ (77.1) (3.8)%Total debt $ 3,215.8 $ 2,913.1 $ 302.6 10.4%Total equity $ 3,136.0 $ 2,974.3 $ 161.7 5.4%

(1) Amounts are net of offset accounts of $321.0 and $288.2, respectively.

Three Months Ended June 30, Six Months Ended June 30, 2025 2024 2025 2024NEW VEHICLE UNIT SALES GEOGRAPHIC MIX:United States 73.6% 82.4% 70.5% 81.1%United Kingdom 26.4% 17.6% 29.5% 18.9%NEW VEHICLE UNIT SALES BRAND MIX:Toyota/Lexus 26.7% 26.5% 24.9% 26.0%Volkswagen/Audi/Porsche/SEAT/SKODA 14.3% 13.2% 15.8% 13.5%BMW/MINI 11.7% 10.6% 12.0% 11.2%Mercedes-Benz/Sprinter 7.6% 5.6% 8.5% 5.7%Honda/Acura 8.9% 10.1% 8.5% 9.4%Chevrolet/GMC/Buick 8.8% 9.6% 8.3% 9.3%Ford/Lincoln 7.1% 7.1% 6.8% 7.2%Hyundai/Kia/Genesis 5.6% 6.0% 5.4% 5.7%Jaguar/Land Rover 2.2% 1.7% 2.6% 1.9%Subaru 2.2% 3.4% 2.5% 3.4%Nissan 2.1% 2.4% 2.0% 2.5%Chrysler/Dodge/Jeep/RAM 1.6% 2.5% 1.7% 2.6%Mazda 1.1% 1.2% 1.1% 1.3%Other 0.1% 0.1% 0.1% 0.1% 100.0% 100.0% 100.0% 100.0%

June 30, 2025 December 31, 2024 June 30, 2024DAYS' SUPPLY IN INVENTORY (1):ConsolidatedNew vehicle inventory 43 44 56Used vehicle inventory 35 39 34U.S.New vehicle inventory 48 43 62Used vehicle inventory 31 29 30U.K.New vehicle inventory 32 45 35Used vehicle inventory 43 67 49

(1) Days' supply in inventory is calculated based on inventory unit levels and 30-day total unit sales volumes, both at the end of each reporting period.

Group 1 Automotive, Inc.Reported Operating Data – Consolidated(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 2,735.5 $ 2,364.2 $ 371.3 15.7% $ 33.7 14.3%Used vehicle retail sales 1,848.2 1,453.2 395.0 27.2% 35.5 24.7%Used vehicle wholesale sales 163.8 104.3 59.5 57.0% 4.3 52.9%Total used 2,012.0 1,557.5 454.4 29.2% 39.8 26.6%Parts and service sales 718.4 574.5 143.8 25.0% 9.0 23.5%F&I, net 237.8 200.1 37.6 18.8% 2.2 17.7%Total revenues $ 5,703.5 $ 4,696.4 $ 1,007.2 21.4% $ 84.7 19.6%Gross profit:New vehicle retail sales $ 198.4 $ 170.0 $ 28.3 16.6% $ 2.7 15.1%Used vehicle retail sales 96.4 80.7 15.7 19.5% 1.5 17.6%Used vehicle wholesale sales 0.5 (1.1) 1.6 143.8% (0.1) NMTotal used 96.9 79.5 17.4 21.8% 1.4 20.1%Parts and service sales 402.8 316.8 85.9 27.1% 5.3 25.5%F&I, net 237.8 200.1 37.6 18.8% 2.2 17.7%Total gross profit $ 935.8 $ 766.5 $ 169.3 22.1% $ 11.5 20.6%Gross margin:New vehicle retail sales 7.3% 7.2% 0.1%Used vehicle retail sales 5.2% 5.6% (0.3)%Used vehicle wholesale sales 0.3% (1.1)% 1.4%Total used 4.8% 5.1% (0.3)%Parts and service sales 56.1% 55.1% 0.9%Total gross margin 16.4% 16.3% 0.1%Units sold:Retail new vehicles sold (1) 55,763 47,661 8,102 17.0%Retail used vehicles sold (1) 60,240 49,260 10,980 22.3%Wholesale used vehicles sold 17,030 11,819 5,211 44.1%Total used 77,270 61,079 16,191 26.5%Average sales price per unit sold:New vehicle retail (1) $ 50,557 $ 49,996 $ 561 1.1% $ 617 (0.1)%Used vehicle retail (1) $ 30,713 $ 29,501 $ 1,212 4.1% $ 590 2.1%Gross profit per unit sold:New vehicle retail sales $ 3,557 $ 3,568 $ (11) (0.3)% $ 48 (1.7)%Used vehicle retail sales $ 1,600 $ 1,638 $ (37) (2.3)% $ 25 (3.8)%Used vehicle wholesale sales $ 29 $ (96) $ 125 130.4% $ (6) 136.6%Total used $ 1,254 $ 1,302 $ (48) (3.7)% $ 18 (5.1)%F&I PRU $ 2,050 $ 2,065 $ (15) (0.7)% $ 19 (1.6)%Other:SG&A expenses $ 646.1 $ 497.2 $ 148.9 29.9% $ 9.6 28.0%Adjusted SG&A expenses (2) $ 642.5 $ 508.2 $ 134.4 26.4% $ 9.6 24.5%SG&A as % gross profit 69.0% 64.9% 4.2%Adjusted SG&A as % gross profit (2) 68.7% 66.3% 2.4%Operating margin % 4.4% 5.1% (0.7)%Adjusted operating margin % (2) 4.7% 5.0% (0.3)%Pretax margin % 3.2% 3.9% (0.7)%Adjusted pretax margin % (2) 3.4% 3.7% (0.3)%Floorplan expense:Floorplan interest expense $ 26.4 $ 24.7 $ 1.8 7.1% $ 0.3 5.8%Less: Floorplan assistance (3) 22.6 21.0 1.6 7.8% – 7.8%Net floorplan expense $ 3.8 $ 3.7 $ 0.1 $ 0.3

(1) Retail new and used vehicle units sold include new and used vehicle agency units. The agency units and related revenues are excluded from the calculation of the average sales price per unit sold for new and used vehicles due to their net presentation within revenues. The agency units and related net revenues are included in the calculation of gross profit per unit sold.(2)See the section in this release titled “Reconciliation of Certain Non-GAAP Financial Measures” for the GAAP to non-GAAP reconciliation of these figures.(3)Floorplan assistance is included within New vehicle retail Gross profit above and New vehicle retail Cost of sales in our Condensed Consolidated Statements of Operations.NM – Not Meaningful

Group 1 Automotive, Inc.Reported Operating Data – Consolidated(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 5,415.4 $ 4,546.8 $ 868.6 19.1% $ 34.1 18.4%Used vehicle retail sales 3,603.6 2,870.0 733.6 25.6% 31.5 24.5%Used vehicle wholesale sales 315.4 210.3 105.0 49.9% 4.0 48.0%Total used 3,919.0 3,080.3 838.7 27.2% 35.5 26.1%Parts and service sales 1,410.4 1,150.8 259.7 22.6% 7.9 21.9%F&I, net 464.0 389.0 75.0 19.3% 2.0 18.8%Total revenues $ 11,208.8 $ 9,166.9 $ 2,041.9 22.3% $ 79.4 21.4%Gross profit:New vehicle retail sales $ 388.0 $ 329.6 $ 58.4 17.7% $ 2.8 16.9%Used vehicle retail sales 189.9 162.7 27.2 16.7% 1.3 15.9%Used vehicle wholesale sales 2.0 (2.0) 4.1 NM (0.1) NMTotal used 192.0 160.7 31.3 19.5% 1.2 18.7%Parts and service sales 783.8 629.9 153.9 24.4% 4.7 23.7%F&I, net 464.0 389.0 75.0 19.3% 2.0 18.8%Total gross profit $ 1,827.7 $ 1,509.1 $ 318.6 21.1% $ 10.7 20.4%Gross margin:New vehicle retail sales 7.2% 7.2% (0.1)%Used vehicle retail sales 5.3% 5.7% (0.4)%Used vehicle wholesale sales 0.6% (1.0)% 1.6%Total used 4.9% 5.2% (0.3)%Parts and service sales 55.6% 54.7% 0.8%Total gross margin 16.3% 16.5% (0.2)%Units sold:Retail new vehicles sold (1) 111,862 91,963 19,899 21.6%Retail used vehicles sold (1) 119,858 98,443 21,415 21.8%Wholesale used vehicles sold 33,384 23,647 9,737 41.2%Total used 153,242 122,090 31,152 25.5%Average sales price per unit sold:New vehicle retail (1) $ 50,210 $ 49,858 $ 353 0.7% $ 313 0.1%Used vehicle retail (1) $ 30,084 $ 29,154 $ 931 3.2% $ 263 2.3%Gross profit per unit sold:New vehicle retail sales $ 3,469 $ 3,584 $ (115) (3.2)% $ 25 (3.9)%Used vehicle retail sales $ 1,585 $ 1,653 $ (68) (4.1)% $ 11 (4.8)%Used vehicle wholesale sales $ 61 $ (86) $ 147 NM $ (2) NMTotal used $ 1,253 $ 1,316 $ (64) (4.8)% $ 8 (5.4)%F&I PRU $ 2,002 $ 2,043 $ (41) (2.0)% $ 9 (2.4)%Other:SG&A expenses $ 1,263.4 $ 973.3 $ 290.0 29.8% $ 8.5 28.9%Adjusted SG&A expenses (2) $ 1,262.8 $ 1,008.3 $ 254.5 25.2% $ 8.5 24.4%SG&A as % gross profit 69.1% 64.5% 4.6%Adjusted SG&A as % gross profit (2) 69.1% 66.8% 2.3%Operating margin % 4.3% 5.3% (0.9)%Adjusted operating margin % (2) 4.5% 4.9% (0.4)%Pretax margin % 3.1% 4.1% (1.0)%Adjusted pretax margin % (2) 3.3% 3.8% (0.4)%Floorplan expense:Floorplan interest expense $ 53.3 $ 45.2 $ 8.1 18.0% $ 0.3 17.3%Less: Floorplan assistance (3) 43.0 39.3 3.7 9.4% – 9.5%Net floorplan expense $ 10.3 $ 5.9 $ 4.4 $ 0.3

Group 1 Automotive, Inc.Reported Operating Data – U.S.(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 2,132.9 $ 2,009.5 $ 123.4 6.1%Used vehicle retail sales 1,203.2 1,151.9 51.3 4.5%Used vehicle wholesale sales 86.5 78.4 8.1 10.3%Total used 1,289.7 1,230.4 59.4 4.8%Parts and service sales 555.5 497.4 58.1 11.7%F&I, net 199.0 183.9 15.1 8.2%Total revenues $ 4,177.2 $ 3,921.2 $ 256.0 6.5%Gross profit:New vehicle retail sales $ 150.5 $ 144.3 $ 6.2 4.3%Used vehicle retail sales 68.6 65.8 2.8 4.3%Used vehicle wholesale sales 2.5 1.3 1.2 97.6%Total used 71.1 67.1 4.0 6.0%Parts and service sales 308.1 272.5 35.7 13.1%F&I, net 199.0 183.9 15.1 8.2%Total gross profit $ 728.7 $ 667.7 $ 61.0 9.1%Gross margin:New vehicle retail sales 7.1% 7.2% (0.1)%Used vehicle retail sales 5.7% 5.7% -%Used vehicle wholesale sales 2.9% 1.6% 1.3%Total used 5.5% 5.5% 0.1%Parts and service sales 55.5% 54.8% 0.7%Total gross margin 17.4% 17.0% 0.4%Units sold:Retail new vehicles sold 41,067 39,273 1,794 4.6%Retail used vehicles sold 39,665 38,611 1,054 2.7%Wholesale used vehicles sold 9,661 8,964 697 7.8%Total used 49,326 47,575 1,751 3.7%Average sales price per unit sold:New vehicle retail $ 51,938 $ 51,169 $ 769 1.5%Used vehicle retail $ 30,335 $ 29,834 $ 501 1.7%Gross profit per unit sold:New vehicle retail sales $ 3,664 $ 3,674 $ (10) (0.3)%Used vehicle retail sales $ 1,730 $ 1,705 $ 25 1.5%Used vehicle wholesale sales $ 259 $ 141 $ 118 83.3%Total used $ 1,442 $ 1,410 $ 32 2.3%F&I PRU $ 2,465 $ 2,361 $ 104 4.4%Other:SG&A expenses $ 471.6 $ 417.6 $ 53.9 12.9%Adjusted SG&A expenses (1) $ 468.0 $ 429.9 $ 38.1 8.9%SG&A as % gross profit 64.7% 62.5% 2.2%Adjusted SG&A as % gross profit (1) 64.2% 64.4% (0.2)%

(1)See the section in this release titled “Reconciliation of Certain Non-GAAP Financial Measures” for the GAAP to non-GAAP reconciliation of these figures.

Group 1 Automotive, Inc.Reported Operating Data – U.S.(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 4,101.6 $ 3,809.4 $ 292.3 7.7%Used vehicle retail sales 2,347.6 2,251.4 96.2 4.3%Used vehicle wholesale sales 178.5 158.3 20.2 12.7%Total used 2,526.0 2,409.7 116.3 4.8%Parts and service sales 1,086.8 992.6 94.2 9.5%F&I, net 384.5 355.2 29.2 8.2%Total revenues $ 8,098.9 $ 7,566.9 $ 532.0 7.0%Gross profit:New vehicle retail sales $ 281.1 $ 276.2 $ 4.9 1.8%Used vehicle retail sales 134.4 132.4 2.0 1.5%Used vehicle wholesale sales 5.1 2.7 2.4 89.6%Total used 139.5 135.1 4.4 3.2%Parts and service sales 598.6 540.3 58.3 10.8%F&I, net 384.5 355.2 29.2 8.2%Total gross profit $ 1,403.7 $ 1,306.8 $ 96.8 7.4%Gross margin:New vehicle retail sales 6.9% 7.2% (0.4)%Used vehicle retail sales 5.7% 5.9% (0.2)%Used vehicle wholesale sales 2.8% 1.7% 1.2%Total used 5.5% 5.6% (0.1)%Parts and service sales 55.1% 54.4% 0.6%Total gross margin 17.3% 17.3% 0.1%Units sold:Retail new vehicles sold 78,902 74,614 4,288 5.7%Retail used vehicles sold 78,278 76,496 1,782 2.3%Wholesale used vehicles sold 19,878 18,052 1,826 10.1%Total used 98,156 94,548 3,608 3.8%Average sales price per unit sold:New vehicle retail $ 51,984 $ 51,054 $ 929 1.8%Used vehicle retail $ 29,990 $ 29,431 $ 559 1.9%Gross profit per unit sold:New vehicle retail sales $ 3,563 $ 3,701 $ (139) (3.7)%Used vehicle retail sales $ 1,717 $ 1,731 $ (14) (0.8)%Used vehicle wholesale sales $ 255 $ 148 $ 107 72.2%Total used $ 1,421 $ 1,429 $ (8) (0.6)%F&I PRU $ 2,446 $ 2,351 $ 95 4.0%Other:SG&A expenses $ 919.0 $ 812.5 $ 106.5 13.1%Adjusted SG&A expenses (1) $ 919.4 $ 850.0 $ 69.4 8.2%SG&A as % gross profit 65.5% 62.2% 3.3%Adjusted SG&A as % gross profit (1) 65.5% 65.0% 0.5%

(1)See the section in this release titled “Reconciliation of Certain Non-GAAP Financial Measures” for the GAAP to non-GAAP reconciliation of these figures.

Group 1 Automotive, Inc.Reported Operating Data – U.K.(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 602.5 $ 354.6 $ 247.9 69.9% $ 33.7 60.4%Used vehicle retail sales 645.0 301.3 343.7 114.1% 35.5 102.3%Used vehicle wholesale sales 77.3 25.9 51.4 198.8% 4.3 182.3%Total used 722.2 327.1 395.1 120.8% 39.8 108.6%Parts and service sales 162.8 77.1 85.7 111.2% 9.0 99.5%F&I, net 38.8 16.3 22.5 138.3% 2.2 125.0%Total revenues $ 1,526.4 $ 775.2 $ 751.2 96.9% $ 84.7 86.0%Gross profit:New vehicle retail sales $ 47.9 $ 25.7 $ 22.1 86.0% $ 2.7 75.5%Used vehicle retail sales 27.8 14.8 12.9 87.3% 1.5 77.0%Used vehicle wholesale sales (2.0) (2.4) 0.4 16.5% (0.1) 20.8%Total used 25.8 12.4 13.3 107.3% 1.4 96.0%Parts and service sales 94.7 44.4 50.3 113.4% 5.3 101.5%F&I, net 38.8 16.3 22.5 138.3% 2.2 125.0%Total gross profit $ 207.1 $ 98.8 $ 108.3 109.6% $ 11.5 97.9%Gross margin:New vehicle retail sales 7.9% 7.3% 0.7%Used vehicle retail sales 4.3% 4.9% (0.6)%Used vehicle wholesale sales (2.6)% (9.3)% 6.7%Total used 3.6% 3.8% (0.2)%Parts and service sales 58.1% 57.5% 0.6%Total gross margin 13.6% 12.7% 0.8%Units sold:Retail new vehicles sold (1) 14,696 8,388 6,308 75.2%Retail used vehicles sold (1) 20,575 10,649 9,926 93.2%Wholesale used vehicles sold 7,369 2,855 4,514 158.1%Total used 27,944 13,504 14,440 106.9%Average sales price per unit sold:New vehicle retail (1) $ 46,163 $ 44,235 $ 1,928 4.4% $ 2,582 (1.5)%Used vehicle retail (1) $ 31,444 $ 28,293 $ 3,152 11.1% $ 1,732 5.0%Gross profit per unit sold:New vehicle retail sales $ 3,259 $ 3,069 $ 189 6.2% $ 183 0.2%Used vehicle retail sales $ 1,350 $ 1,392 $ (43) (3.1)% $ 74 (8.4)%Used vehicle wholesale sales $ (272) $ (842) $ 569 67.7% $ (14) 69.3%Total used $ 922 $ 920 $ 2 0.2% $ 51 (5.3)%F&I PRU $ 1,099 $ 855 $ 244 28.6% $ 61 21.5%Other:SG&A expenses $ 174.5 $ 79.6 $ 94.9 119.3% $ 9.6 107.2%Adjusted SG&A expenses (2) $ 174.5 $ 78.2 $ 96.3 123.1% $ 9.6 110.8%SG&A as % gross profit 84.3% 80.5% 3.7%Adjusted SG&A as % gross profit (2) 84.3% 79.1% 5.1%

Group 1 Automotive, Inc.Reported Operating Data – U.K.(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 1,313.8 $ 737.4 $ 576.4 78.2% $ 34.1 73.5%Used vehicle retail sales 1,256.0 618.6 637.5 103.1% 31.5 98.0%Used vehicle wholesale sales 136.9 52.0 84.9 163.1% 4.0 155.5%Total used 1,392.9 670.6 722.3 107.7% 35.5 102.4%Parts and service sales 323.7 158.2 165.5 104.6% 7.9 99.6%F&I, net 79.5 33.8 45.8 135.5% 2.0 129.6%Total revenues $ 3,109.9 $ 1,600.0 $ 1,509.9 94.4% $ 79.4 89.4%Gross profit:New vehicle retail sales $ 106.9 $ 53.4 $ 53.5 100.2% $ 2.8 95.0%Used vehicle retail sales 55.5 30.3 25.2 83.3% 1.3 78.9%Used vehicle wholesale sales (3.1) (4.7) 1.7 35.2% (0.1) 36.9%Total used 52.5 25.6 26.9 105.1% 1.2 100.3%Parts and service sales 185.1 89.6 95.6 106.7% 4.7 101.5%F&I, net 79.5 33.8 45.8 135.5% 2.0 129.6%Total gross profit $ 424.0 $ 202.3 $ 221.7 109.6% $ 10.7 104.3%Gross margin:New vehicle retail sales 8.1% 7.2% 0.9%Used vehicle retail sales 4.4% 4.9% (0.5)%Used vehicle wholesale sales (2.2)% (9.1)% 6.8%Total used 3.8% 3.8% -%Parts and service sales 57.2% 56.6% 0.6%Total gross margin 13.6% 12.6% 1.0%Units sold:Retail new vehicles sold (1) 32,960 17,349 15,611 90.0%Retail used vehicles sold (1) 41,580 21,947 19,633 89.5%Wholesale used vehicles sold 13,506 5,595 7,911 141.4%Total used 55,086 27,542 27,544 100.0%Average sales price per unit sold:New vehicle retail (1) $ 45,327 $ 44,459 $ 868 2.0% $ 1,174 (0.7)%Used vehicle retail (1) $ 30,261 $ 28,185 $ 2,076 7.4% $ 760 4.7%Gross profit per unit sold:New vehicle retail sales $ 3,243 $ 3,078 $ 166 5.4% $ 84 2.6%Used vehicle retail sales $ 1,336 $ 1,381 $ (45) (3.2)% $ 32 (5.6)%Used vehicle wholesale sales $ (226) $ (842) $ 616 73.2% $ (6) 73.9%Total used $ 953 $ 929 $ 24 2.6% $ 23 0.1%F&I PRU $ 1,067 $ 859 $ 208 24.2% $ 27 21.1%Other:SG&A expenses $ 344.3 $ 160.8 $ 183.5 114.1% $ 8.5 108.8%Adjusted SG&A expenses (2) $ 343.4 $ 158.3 $ 185.0 116.9% $ 8.5 111.5%SG&A as % gross profit 81.2% 79.5% 1.7%Adjusted SG&A as % gross profit (2) 81.0% 78.3% 2.7%

Group 1 Automotive, Inc.Same Store Operating Data – Consolidated(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 2,457.1 $ 2,331.6 $ 125.5 5.4% $ 19.2 4.6%Used vehicle retail sales 1,533.1 1,436.8 96.3 6.7% 18.7 5.4%Used vehicle wholesale sales 121.5 103.0 18.6 18.0% 2.0 16.1%Total used 1,654.7 1,539.8 114.9 7.5% 20.7 6.1%Parts and service sales 633.7 564.7 69.0 12.2% 4.5 11.4%F&I, net 219.0 198.1 20.9 10.6% 1.2 10.0%Total revenues $ 4,964.5 $ 4,634.2 $ 330.3 7.1% $ 45.5 6.1%Gross profit:New vehicle retail sales $ 172.5 $ 167.3 $ 5.2 3.1% $ 1.4 2.3%Used vehicle retail sales 84.2 79.4 4.8 6.1% 0.9 5.0%Used vehicle wholesale sales 0.9 (1.2) 2.1 NM (0.1) NMTotal used 85.1 78.2 6.9 8.9% 0.8 7.9%Parts and service sales 355.1 311.5 43.6 14.0% 2.7 13.1%F&I, net 219.0 198.1 20.9 10.6% 1.2 10.0%Total gross profit $ 831.7 $ 755.1 $ 76.6 10.1% $ 6.0 9.3%Gross margin:New vehicle retail sales 7.0% 7.2% (0.2)%Used vehicle retail sales 5.5% 5.5% -%Used vehicle wholesale sales 0.7% (1.2)% 1.9%Total used 5.1% 5.1% 0.1%Parts and service sales 56.0% 55.2% 0.9%Total gross margin 16.8% 16.3% 0.5%Units sold:Retail new vehicles sold (1) 48,565 46,880 1,685 3.6%Retail used vehicles sold (1) 50,968 48,595 2,373 4.9%Wholesale used vehicles sold 13,420 11,587 1,833 15.8%Total used 64,388 60,182 4,206 7.0%Average sales price per unit sold:New vehicle retail (1) $ 51,028 $ 50,136 $ 892 1.8% $ 395 1.0%Used vehicle retail (1) $ 30,106 $ 29,567 $ 539 1.8% $ 367 0.6%Gross profit per unit sold:New vehicle retail sales $ 3,552 $ 3,569 $ (18) (0.5)% $ 28 (1.3)%Used vehicle retail sales $ 1,653 $ 1,634 $ 18 1.1% $ 17 0.1%Used vehicle wholesale sales $ 66 $ (107) $ 173 NM $ (7) NMTotal used $ 1,322 $ 1,299 $ 23 1.8% $ 12 0.8%F&I PRU $ 2,200 $ 2,075 $ 125 6.0% $ 12 5.5%Other:SG&A expenses $ 553.8 $ 506.9 $ 46.9 9.2% $ 4.8 8.3%Adjusted SG&A expenses (2) $ 550.9 $ 496.4 $ 54.5 11.0% $ 4.8 10.0%SG&A as % gross profit 66.6% 67.1% (0.5)%Adjusted SG&A as % gross profit (2)66.2% 65.7% 0.5%Operating margin % 5.1% 4.8% 0.3%Adjusted operating margin % (2) 5.1% 5.1% -%

Group 1 Automotive, Inc.Same Store Operating Data – Consolidated(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 4,735.4 $ 4,462.4 $ 273.0 6.1% $ 19.2 5.7%Used vehicle retail sales 2,969.6 2,827.8 141.8 5.0% 16.6 4.4%Used vehicle wholesale sales 237.8 206.4 31.4 15.2% 1.9 14.3%Total used 3,207.4 3,034.2 173.2 5.7% 18.5 5.1%Parts and service sales 1,223.7 1,125.6 98.0 8.7% 3.9 8.4%F&I, net 420.8 383.2 37.6 9.8% 1.1 9.5%Total revenues $ 9,587.2 $ 9,005.4 $ 581.8 6.5% $ 42.6 6.0%Gross profit:New vehicle retail sales $ 322.4 $ 323.0 $ (0.6) (0.2)% $ 1.4 (0.6)%Used vehicle retail sales 162.1 160.1 2.0 1.3% 0.8 0.8%Used vehicle wholesale sales 3.4 (2.2) 5.5 NM (0.1) NMTotal used 165.4 157.9 7.6 4.8% 0.7 4.3%Parts and service sales 677.8 616.3 61.5 10.0% 2.4 9.6%F&I, net 420.8 383.2 37.6 9.8% 1.1 9.5%Total gross profit $ 1,586.4 $ 1,480.3 $ 106.1 7.2% $ 5.6 6.8%Gross margin:New vehicle retail sales 6.8% 7.2% (0.4)%Used vehicle retail sales 5.5% 5.7% (0.2)%Used vehicle wholesale sales 1.4% (1.1)% 2.5%Total used 5.2% 5.2% -%Parts and service sales 55.4% 54.8% 0.6%Total gross margin 16.5% 16.4% 0.1%Units sold:Retail new vehicles sold (1) 93,963 90,033 3,930 4.4%Retail used vehicles sold (1) 100,148 96,834 3,314 3.4%Wholesale used vehicles sold 26,396 23,082 3,314 14.4%Total used 126,544 119,916 6,628 5.5%Average sales price per unit sold:New vehicle retail (1) $ 50,902 $ 49,991 $ 911 1.8% $ 205 1.4%Used vehicle retail (1) $ 29,667 $ 29,203 $ 464 1.6% $ 166 1.0%Gross profit per unit sold:New vehicle retail sales $ 3,431 $ 3,587 $ (156) (4.3)% $ 15 (4.8)%Used vehicle retail sales $ 1,618 $ 1,653 $ (35) (2.1)% $ 8 (2.6)%Used vehicle wholesale sales $ 127 $ (95) $ 222 NM $ (3) NMTotal used $ 1,307 $ 1,316 $ (9) (0.7)% $ 6 (1.1)%F&I PRU $ 2,168 $ 2,051 $ 117 5.7% $ 6 5.4%Other:SG&A expenses $ 1,074.7 $ 999.6 $ 75.1 7.5% $ 4.2 7.1%Adjusted SG&A expenses (2) $ 1,067.1 $ 982.3 $ 84.8 8.6% $ 4.2 8.2%SG&A as % gross profit 67.7% 67.5% 0.2%Adjusted SG&A as % gross profit (2)67.3% 66.4% 0.9%Operating margin % 4.8% 4.8% -%Adjusted operating margin % (2) 4.9% 5.0% (0.1)%

Group 1 Automotive, Inc.Same Store Operating Data – U.S.(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 2,116.0 $ 1,977.0 $ 139.0 7.0%Used vehicle retail sales 1,193.4 1,135.5 57.9 5.1%Used vehicle wholesale sales 85.4 77.1 8.3 10.7%Total used 1,278.8 1,212.6 66.2 5.5%Parts and service sales 553.1 490.3 62.7 12.8%F&I, net 198.1 181.8 16.2 8.9%Total revenues $ 4,146.0 $ 3,861.8 $ 284.2 7.4%Gross profit:New vehicle retail sales $ 148.7 $ 141.6 $ 7.1 5.0%Used vehicle retail sales 68.2 64.6 3.6 5.6%Used vehicle wholesale sales 2.5 1.2 1.3 112.0%Total used 70.7 65.7 5.0 7.5%Parts and service sales 306.8 268.4 38.4 14.3%F&I, net 198.1 181.8 16.2 8.9%Total gross profit $ 724.3 $ 657.6 $ 66.7 10.1%Gross margin:New vehicle retail sales 7.0% 7.2% (0.1)%Used vehicle retail sales 5.7% 5.7% -%Used vehicle wholesale sales 2.9% 1.5% 1.4%Total used 5.5% 5.4% 0.1%Parts and service sales 55.5% 54.7% 0.7%Total gross margin 17.5% 17.0% 0.4%Units sold:Retail new vehicles sold 40,802 38,492 2,310 6.0%Retail used vehicles sold 39,416 37,946 1,470 3.9%Wholesale used vehicles sold 9,591 8,732 859 9.8%Total used 49,007 46,678 2,329 5.0%Average sales price per unit sold:New vehicle retail $ 51,861 $ 51,361 $ 500 1.0%Used vehicle retail $ 30,278 $ 29,924 $ 354 1.2%Gross profit per unit sold:New vehicle retail sales $ 3,645 $ 3,678 $ (34) (0.9)%Used vehicle retail sales $ 1,731 $ 1,702 $ 29 1.7%Used vehicle wholesale sales $ 258 $ 134 $ 124 93.0%Total used $ 1,443 $ 1,409 $ 34 2.4%F&I PRU $ 2,469 $ 2,379 $ 90 3.8%Other:SG&A expenses $ 466.8 $ 428.7 $ 38.1 8.9%Adjusted SG&A expenses (1) $ 463.9 $ 419.5 $ 44.4 10.6%SG&A as % gross profit 64.5% 65.2% (0.7)%Adjusted SG&A as % gross profit (1) 64.0% 63.8% 0.3%

(1)See the section in this release titled “Reconciliation of Certain Non-GAAP Financial Measures” for the GAAP to non-GAAP reconciliation of these figures.

Group 1 Automotive, Inc.Same Store Operating Data – U.S.(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 3,993.8 $ 3,725.0 $ 268.7 7.2%Used vehicle retail sales 2,298.7 2,209.2 89.5 4.1%Used vehicle wholesale sales 174.0 154.3 19.7 12.8%Total used 2,472.7 2,363.6 109.2 4.6%Parts and service sales 1,062.7 973.1 89.6 9.2%F&I, net 377.7 349.4 28.3 8.1%Total revenues $ 7,906.9 $ 7,411.1 $ 495.8 6.7%Gross profit:New vehicle retail sales $ 270.4 $ 269.6 $ 0.8 0.3%Used vehicle retail sales 131.5 129.8 1.7 1.3%Used vehicle wholesale sales 5.0 2.5 2.4 97.0%Total used 136.4 132.3 4.2 3.2%Parts and service sales 583.5 529.4 54.1 10.2%F&I, net 377.7 349.4 28.3 8.1%Total gross profit $ 1,368.0 $ 1,280.7 $ 87.3 6.8%Gross margin:New vehicle retail sales 6.8% 7.2% (0.5)%Used vehicle retail sales 5.7% 5.9% (0.2)%Used vehicle wholesale sales 2.9% 1.6% 1.2%Total used 5.5% 5.6% (0.1)%Parts and service sales 54.9% 54.4% 0.5%Total gross margin 17.3% 17.3% -%Units sold:Retail new vehicles sold 76,755 72,684 4,071 5.6%Retail used vehicles sold 76,673 74,887 1,786 2.4%Wholesale used vehicles sold 19,376 17,487 1,889 10.8%Total used 96,049 92,374 3,675 4.0%Average sales price per unit sold:New vehicle retail $ 52,032 $ 51,249 $ 783 1.5%Used vehicle retail $ 29,981 $ 29,501 $ 480 1.6%Gross profit per unit sold:New vehicle retail sales $ 3,523 $ 3,709 $ (186) (5.0)%Used vehicle retail sales $ 1,715 $ 1,733 $ (18) (1.0)%Used vehicle wholesale sales $ 256 $ 144 $ 112 77.8%Total used $ 1,421 $ 1,432 $ (11) (0.8)%F&I PRU $ 2,462 $ 2,368 $ 94 4.0%Other:SG&A expenses $ 902.1 $ 841.5 $ 60.5 7.2%Adjusted SG&A expenses (1) $ 895.4 $ 826.7 $ 68.7 8.3%SG&A as % gross profit 65.9% 65.7% 0.2%Adjusted SG&A as % gross profit (1) 65.5% 64.6% 0.9%

(1)See the section in this release titled “Reconciliation of Certain Non-GAAP Financial Measures” for the GAAP to non-GAAP reconciliation of these figures.

Group 1 Automotive, Inc.Same Store Operating Data – U.K.(Unaudited)(In millions, except unit data) Three Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 341.1 $ 354.6 $ (13.6) (3.8)% $ 19.2 (9.2)%Used vehicle retail sales 339.7 301.3 38.4 12.7% 18.7 6.5%Used vehicle wholesale sales 36.2 25.9 10.3 39.9% 2.0 32.2%Total used 375.9 327.1 48.7 14.9% 20.7 8.6%Parts and service sales 80.6 74.3 6.3 8.5% 4.5 2.4%F&I, net 21.0 16.3 4.7 28.7% 1.2 21.6%Total revenues $ 818.5 $ 772.4 $ 46.2 6.0% $ 45.5 0.1%Gross profit:New vehicle retail sales $ 23.8 $ 25.7 $ (2.0) (7.6)% $ 1.4 (12.9)%Used vehicle retail sales 16.0 14.8 1.2 7.9% 0.9 2.0%Used vehicle wholesale sales (1.6) (2.4) 0.8 34.0% (0.1) 37.9%Total used 14.4 12.4 2.0 16.0% 0.8 9.8%Parts and service sales 48.3 43.1 5.2 12.0% 2.7 5.8%F&I, net 21.0 16.3 4.7 28.7% 1.2 21.6%Total gross profit $ 107.4 $ 97.5 $ 9.9 10.1% $ 6.0 4.0%Gross margin:New vehicle retail sales 7.0% 7.3% (0.3)%Used vehicle retail sales 4.7% 4.9% (0.2)%Used vehicle wholesale sales (4.4)% (9.3)% 4.9%Total used 3.8% 3.8% -%Parts and service sales 59.9% 58.0% 1.9%Total gross margin 13.1% 12.6% 0.5%Units sold:Retail new vehicles sold (1) 7,763 8,388 (625) (7.5)%Retail used vehicles sold (1) 11,552 10,649 903 8.5%Wholesale used vehicles sold 3,829 2,855 974 34.1%Total used 15,381 13,504 1,877 13.9%Average sales price per unit sold:New vehicle retail (1) $ 46,376 $ 44,235 $ 2,141 4.8% $ 2,604 (1.0)%Used vehicle retail (1) $ 29,515 $ 28,293 $ 1,222 4.3% $ 1,625 (1.4)%Gross profit per unit sold:New vehicle retail sales $ 3,063 $ 3,069 $ (6) (0.2)% $ 174 (5.9)%Used vehicle retail sales $ 1,385 $ 1,392 $ (7) (0.5)% $ 76 (5.9)%Used vehicle wholesale sales $ (414) $ (842) $ 427 50.8% $ (25) 53.7%Total used $ 937 $ 920 $ 17 1.9% $ 51 (3.6)%F&I PRU $ 1,085 $ 855 $ 230 26.9% $ 60 19.9%Other:SG&A expenses $ 87.0 $ 78.2 $ 8.7 11.2% $ 4.8 5.1%Adjusted SG&A expenses (2) $ 87.0 $ 76.9 $ 10.1 13.2% $ 4.8 7.0%SG&A as % gross profit 81.0% 80.2% 0.7%Adjusted SG&A as % gross profit (2) 81.0% 78.8% 2.2%

Group 1 Automotive, Inc.Same Store Operating Data – U.K.(Unaudited)(In millions, except unit data) Six Months Ended June 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency % Current Change Period ResultsRevenues:New vehicle retail sales $ 741.7 $ 737.4 $ 4.3 0.6% $ 19.2 (2.0)%Used vehicle retail sales 670.9 618.6 52.3 8.5% 16.6 5.8%Used vehicle wholesale sales 63.8 52.0 11.7 22.6% 1.9 19.0%Total used 734.7 670.6 64.1 9.6% 18.5 6.8%Parts and service sales 160.9 152.5 8.5 5.5% 3.9 3.0%F&I, net 43.0 33.8 9.3 27.5% 1.1 24.3%Total revenues $ 1,680.3 $ 1,594.3 $ 86.1 5.4% $ 42.6 2.7%Gross profit:New vehicle retail sales $ 52.0 $ 53.4 $ (1.4) (2.5)% $ 1.4 (5.2)%Used vehicle retail sales 30.6 30.3 0.3 0.9% 0.8 (1.7)%Used vehicle wholesale sales (1.6) (4.7) 3.1 65.8% (0.1) 67.7%Total used 29.0 25.6 3.4 13.2% 0.7 10.5%Parts and service sales 94.4 86.9 7.4 8.6% 2.4 5.8%F&I, net 43.0 33.8 9.3 27.5% 1.1 24.3%Total gross profit $ 218.4 $ 199.7 $ 18.7 9.4% $ 5.6 6.6%Gross margin:New vehicle retail sales 7.0% 7.2% (0.2)%Used vehicle retail sales 4.6% 4.9% (0.3)%Used vehicle wholesale sales (2.5)% (9.1)% 6.5%Total used 3.9% 3.8% 0.1%Parts and service sales 58.6% 57.0% 1.6%Total gross margin 13.0% 12.5% 0.5%Units sold:Retail new vehicles sold (1) 17,208 17,349 (141) (0.8)%Retail used vehicles sold (1) 23,475 21,947 1,528 7.0%Wholesale used vehicles sold 7,020 5,595 1,425 25.5%Total used 30,495 27,542 2,953 10.7%Average sales price per unit sold:New vehicle retail (1) $ 45,540 $ 44,459 $ 1,081 2.4% $ 1,175 (0.2)%Used vehicle retail (1) $ 28,641 $ 28,185 $ 455 1.6% $ 709 (0.9)%Gross profit per unit sold:New vehicle retail sales $ 3,024 $ 3,078 $ (53) (1.7)% $ 82 (4.4)%Used vehicle retail sales $ 1,303 $ 1,381 $ (78) (5.6)% $ 34 (8.1)%Used vehicle wholesale sales $ (229) $ (842) $ 612 72.7% $ (13) 74.3%Total used $ 950 $ 929 $ 21 2.3% $ 23 (0.2)%F&I PRU $ 1,058 $ 859 $ 199 23.1% $ 26 20.1%Other:SG&A expenses $ 172.6 $ 158.1 $ 14.5 9.2% $ 4.2 6.5%Adjusted SG&A expenses (2) $ 171.7 $ 155.6 $ 16.1 10.3% $ 4.2 7.6%SG&A as % gross profit 79.0% 79.2% (0.1)%Adjusted SG&A as % gross profit (2) 78.6% 77.9% 0.7%

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Three Months Ended June 30, 2025 U.S. GAAP Catastrophic Dealership Restructuring Acquisition Legal items Asset Non-GAAP events and real charges costs and other impairments adjusted estate professional and transactions fees accelerated depreciationSG&A expenses $ 646.1 $ (1.4) $ (0.6) $ – $ (0.7) $ (0.8) $ – $ 642.5Depreciation and amortization expense $ 28.7 $ – $ – $ – $ – $ – $ (1.0) $ 27.8Asset impairments $ 0.4 $ – $ – $ – $ – $ – $ (0.4) $ -Restructuring charges $ 7.6 $ – $ – $ (7.6) $ – $ – $ – $ -Income from operations $ 253.0 $ 1.4 $ 0.6 $ 7.6 $ 0.7 $ 0.8 $ 1.3 $ 265.5Income before income taxes $ 183.9 $ 1.4 $ 0.6 $ 7.6 $ 0.7 $ 0.8 $ 1.3 $ 196.4Less: Provision for income taxes 44.0 0.3 0.5 1.2 0.2 0.2 0.3 46.8Net income from continuing operations 139.8 1.1 0.1 6.5 0.6 0.6 1.0 149.6Less: Earnings allocated to participating securities 1.6 – – 0.1 – – – 1.7Net income from continuing operations available to diluted common shares $ 138.3 $ 1.1 $ 0.1 $ 6.4 $ 0.6 $ 0.6 $ 1.0 $ 147.9Diluted earnings per common share from continuing operations $ 10.77 $ 0.08 $ 0.01 $ 0.50 $ 0.04 $ 0.05 $ 0.08 $ 11.52Effective tax rate 24.0% 23.8%SG&A as % gross profit (1) 69.0% 68.7%Operating margin (2) 4.4% 4.7%Pretax margin (3) 3.2% 3.4%Same Store SG&A expenses $ 553.8 $ (1.4) $ – $ – $ (0.7) $ (0.8) $ – $ 550.9Same Store SG&A as % gross profit (1) 66.6% 66.2%Same Store income from operations $ 251.3 $ 1.4 $ – $ – $ 0.7 $ 0.8 $ 1.3 $ 255.6Same Store operating margin (2) 5.1% 5.1%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 0.7 $ – $ 0.7Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 0.7 $ – $ 0.7Net income $ 140.5 $ 9.8 $ 150.3Less: Earnings allocated to participating securities 1.6 0.1 1.7Net income available to diluted common shares $ 139.0 $ 9.7 $ 148.6Diluted earnings per common share from discontinued operations $ 0.05 $ – $ 0.05Diluted earnings per common share from continuing operations 10.77 0.75 11.52Diluted earnings per common share $ 10.82 $ 0.75 $ 11.57

(1)Adjusted SG&A as % of gross profit excludes the impact of SG&A reconciling items above.(2)Adjusted operating margin excludes the impact of SG&A reconciling items, accelerated depreciation expense, asset impairment charges and restructuring charges.(3)Adjusted pretax margin excludes the impact of SG&A reconciling items, accelerated depreciation expense, asset impairment charges and restructuring charges.

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Three Months Ended June 30, 2024 U.S. GAAP Catastrophic Dealership Severance Acquisition Legal items Accelerated Non-GAAP events and real costs costs and other depreciation adjusted estate professional transactions feesSG&A expenses $ 497.2 $ (8.6) $ 21.5 $ (0.1) $ (1.7) $ (0.2) $ – $ 508.2Depreciation and amortization expense $ 28.2 $ – $ – $ – $ – $ – $ (3.7) $ 24.5Income (loss) from operations $ 241.1 $ 8.6 $ (21.5) $ 0.1 $ 1.7 $ 0.2 $ 3.7 $ 233.9Income (loss) before income taxes $ 183.0 $ 8.6 $ (21.5) $ 0.1 $ 1.7 $ 0.2 $ 3.7 $ 175.8Less: Provision (benefit) for income taxes 45.2 2.1 (5.6) – 0.1 – 0.9 42.7Net income (loss) from continuing operations 137.9 6.5 (15.9) 0.1 1.6 0.1 2.8 133.1Less: Earnings (loss) allocated to participating securities 2.9 0.1 (0.3) – – – 0.1 2.8Net income (loss) from continuing operations available to diluted common shares $ 134.9 $ 6.4 $ (15.5) $ 0.1 $ 1.5 $ 0.1 $ 2.8 $ 130.3Diluted earnings (loss) per common share from continuing operations $ 10.15 $ 0.48 $ (1.17) $ 0.01 $ 0.12 $ 0.01 $ 0.21 $ 9.80Effective tax rate 24.7% 24.3%SG&A as % gross profit (1) 64.9% 66.3%Operating margin (2) 5.1% 5.0%Pretax margin (3) 3.9% 3.7%Same Store SG&A expenses $ 506.9 $ (8.6) $ – $ (0.1) $ (1.7) $ (0.2) $ – $ 496.4Same Store SG&A as % gross profit (1) 67.1% 65.7%Same Store income from operations $ 222.7 $ 8.6 $ – $ 0.1 $ 1.7 $ 0.2 $ 3.7 $ 237.0Same Store operating margin (2) 4.8% 5.1%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 0.3 $ – $ 0.3Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 0.3 $ – $ 0.3Net income (loss) $ 138.2 $ (4.7) $ 133.4Less: Earnings (loss) allocated to participating securities 2.9 (0.1) 2.8Net income (loss) available to diluted common shares $ 135.2 $ (4.6) $ 130.6Diluted earnings per common share from discontinued operations $ 0.02 $ – $ 0.02Diluted earnings (loss) per common share from continuing operations 10.15 (0.35) 9.80Diluted earnings (loss) per common share $ 10.17 $ (0.35) $ 9.82

(1)Adjusted SG&A as % of gross profit excludes the impact of SG&A reconciling items above.(2)Adjusted operating margin excludes the impact of SG&A reconciling items and accelerated depreciation expense.(3)Adjusted pretax margin excludes the impact of SG&A reconciling items and accelerated depreciation expense.

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Six Months Ended June 30, 2025 U.S. Catastrophic Dealership Severance Restructuring Acquisition Legal items Asset Non-GAAP GAAP events and real costs charges costs and other impairments adjusted estate professional and transactions fees accelerated depreciationSG&A expenses $ 1,263.4 $ (1.4) $ 7.1 $ (1.0) $ – $ (1.8) $ (3.4) $ – $ 1,262.8Depreciation and amortization expense $ 58.0 $ – $ – $ – $ – $ – $ – $ (1.4) $ 56.6Asset impairments $ 0.8 $ – $ – $ – $ – $ – $ – $ (0.8) $ -Restructuring charges $ 18.7 $ – $ – $ – $ (18.7) $ – $ – $ – $ -Income (loss) from operations $ 486.9 $ 1.4 $ (7.1) $ 1.0 $ 18.7 $ 1.8 $ 3.4 $ 2.1 $ 508.3Income (loss) before income taxes $ 351.4 $ 1.4 $ (7.1) $ 1.0 $ 18.7 $ 1.8 $ 3.4 $ 2.1 $ 372.8Less: Provision (benefit) for income taxes 83.8 0.3 (1.2) – 3.9 0.2 0.8 0.5 88.4Net income (loss) from continuing operations 267.6 1.1 (5.9) 1.0 14.8 1.6 2.6 1.6 284.4Less: Earnings (loss) allocated to participating securities 3.2 – (0.1) – 0.2 – – – 3.4Net income (loss) from continuing operations available to diluted common shares $ 264.4 $ 1.1 $ (5.9) $ 1.0 $ 14.6 $ 1.6 $ 2.6 $ 1.6 $ 281.0Diluted earnings (loss) per common share from continuing operations $ 20.40 $ 0.08 $ (0.45) $ 0.08 $ 1.13 $ 0.12 $ 0.20 $ 0.12 $ 21.68Effective tax rate 23.8% 23.7%SG&A as % gross profit (1) 69.1% 69.1%Operating margin (2) 4.3% 4.5%Pretax margin (3) 3.1% 3.3%Same Store SG&A expenses $ 1,074.7 $ (1.4) $ – $ (1.0) $ – $ (1.8) $ (3.4) $ – $ 1,067.1Same Store SG&A as % gross profit (1) 67.7% 67.3%Same Store income from operations $ 462.0 $ 1.4 $ – $ 1.0 $ – $ 1.8 $ 3.4 $ 0.5 $ 470.2Same Store operating margin (2) 4.8% 4.9%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 1.0 $ – $ 1.0Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 1.0 $ – $ 1.0Net income $ 268.6 $ 16.8 $ 285.4Less: Earnings allocated to participating securities 3.2 0.2 3.4Net income available to diluted common shares $ 265.4 $ 16.6 $ 282.0Diluted earnings per common share from discontinued operations $ 0.08 $ – $ 0.08Diluted earnings per common share from continuing operations 20.40 1.28 21.68Diluted earnings per common share $ 20.48 $ 1.28 $ 21.76

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Six Months Ended June 30, 2024 U.S. GAAP Catastrophic Dealership Severance Acquisition Legal items Accelerated Non-GAAP events and real costs costs and other depreciation adjusted estate professional transactions feesSG&A expenses $ 973.3 $ (9.1) $ 52.4 $ (0.6) $ (4.5) $ (3.3) $ – $ 1,008.3Depreciation and amortization expense $ 52.0 $ – $ – – $ – $ – $ (4.2) $ 47.9Income (loss) from operations $ 483.8 $ 9.1 $ (52.4) 0.6 $ 4.5 $ 3.3 $ 4.2 $ 452.9Income (loss) before income taxes $ 376.3 $ 9.1 $ (52.4) $ 0.6 $ 4.5 $ 3.3 $ 4.2 $ 345.4Less: Provision (benefit) for income taxes 91.0 2.2 (13.4) 0.1 0.6 0.8 1.0 82.2Net income (loss) from continuing operations 285.3 6.9 (38.9) 0.4 3.9 2.5 3.2 263.2Less: Earnings (loss) allocated to participating securities 6.3 0.2 (0.9) – 0.1 0.1 0.1 5.8Net income (loss) from continuing operations available to diluted common shares $ 279.0 $ 6.7 $ (38.1) $ 0.4 $ 3.8 $ 2.4 $ 3.1 $ 257.4Diluted earnings (loss) per common share from continuing operations $ 20.91 $ 0.51 $ (2.85) $ 0.03 $ 0.28 $ 0.18 $ 0.23 $ 19.29Effective tax rate 24.2% 23.8%SG&A as % gross profit (1) 64.5% 66.8%Operating margin (2) 5.3% 4.9%Pretax margin (3) 4.1% 3.8%Same Store SG&A expenses $ 999.6 $ (9.1) $ – $ (0.6) $ (4.5) $ (3.3) $ – $ 982.3Same Store SG&A as % gross profit (1) 67.5% 66.4%Same Store income from operations $ 430.7 $ 9.1 $ – $ 0.6 $ 4.5 $ 3.3 $ 4.2 $ 452.2Same Store operating margin (2) 4.8% 5.0%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 0.8 $ – $ 0.8Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 0.8 $ – $ 0.8Net income (loss) $ 286.1 $ (22.1) $ 264.0Less: Earnings (loss) allocated to participating securities 6.3 (0.5) 5.8Net income (loss) available to diluted common shares $ 279.8 $ (21.6) $ 258.2Diluted earnings per common share from discontinued operations $ 0.06 $ – $ 0.06Diluted earnings (loss) per common share from continuing operations 20.91 (1.62) 19.29Diluted earnings (loss) per common share $ 20.97 $ (1.62) $ 19.35

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – U.S.(Unaudited)(In millions) Three Months Ended June 30, 2025 U.S. GAAP Catastrophic Dealership Acquisition Legal items Non-GAAP events and realestate costs and other adjusted transactions professional feesSG&A expenses $ 471.6 $ (1.4) $ (0.6) $ (0.7) $ (0.8) $ 468.0SG&A as % gross profit (1) 64.7% 64.2%Same Store SG&A expenses $ 466.8 $ (1.4) $ – $ (0.7) $ (0.8) $ 463.9Same Store SG&A as % gross profit (1) 64.5% 64.0%

Three Months Ended June 30, 2024 U.S. GAAP Catastrophic Dealership Acquisition Legal items Non-GAAP events and real estate costs and other adjusted transactions professional feesSG&A expenses $ 417.6 $ (8.6) $ 21.5 $ (0.4) $ (0.2) $ 429.9SG&A as % gross profit (1) 62.5% 64.4%Same Store SG&A expenses $ 428.7 $ (8.6) $ – $ (0.4) $ (0.2) $ 419.5Same Store SG&A as % gross profit (1) 65.2% 63.8%

Six Months Ended June 30, 2025 U.S. GAAP Catastrophic Dealership Severance Acquisition Legal items Non-GAAP events and real estate costs costs and other adjusted transactions professional feesSG&A expenses $ 919.0 $ (1.4) $ 7.1 $ (1.0) $ (0.8) $ (3.4) $ 919.4SG&A as % gross profit (1) 65.5% 65.5%Same Store SG&A expenses $ 902.1 $ (1.4) $ – $ (1.0) $ (0.8) $ (3.4) $ 895.4Same Store SG&A as % gross profit (1) 65.9% 65.5%

Six Months Ended June 30, 2024 U.S. GAAP Catastrophic Dealership Acquisition Legal items Non-GAAP events and real estate costs and other adjusted transactions professional feesSG&A expenses $ 812.5 $ (9.1) $ 52.4 $ (2.5) $ (3.3) $ 850.0SG&A as % gross profit (1) 62.2% 65.0%Same Store SG&A expenses $ 841.5 $ (9.1) $ – $ (2.5) $ (3.3) $ 826.7Same Store SG&A as % gross profit (1) 65.7% 64.6%

(1)Adjusted SG&A as % of gross profit excludes the impact of SG&A reconciling items above.

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – U.K.(Unaudited)(In millions) Three Months Ended June 30, 2024 U.S. GAAP Severance costs Acquisition costs Non-GAAP AdjustedSG&A expenses $ 79.6 $ (0.1) $ (1.2) $ 78.2SG&A as % gross profit (1) 80.5% 79.1%Same Store SG&A expenses $ 78.2 $ (0.1) $ (1.2) $ 76.9Same Store SG&A as % gross profit (1) 80.2% 78.8%

Six Months Ended June 30, 2025 U.S. GAAP Acquisition costs Non-GAAP AdjustedSG&A expenses $ 344.3 $ (1.0) $ 343.4SG&A as % gross profit (1) 81.2% 81.0%Same Store SG&A expenses $ 172.6 $ (1.0) $ 171.7Same Store SG&A as % gross profit (1) 79.0% 78.6%

Six Months Ended June 30, 2024 U.S. GAAP Severance costs Acquisition costs Non-GAAP AdjustedSG&A expenses $ 160.8 $ (0.6) $ (1.9) $ 158.3SG&A as % gross profit (1) 79.5% 78.3%Same Store SG&A expenses $ 158.1 $ (0.6) $ (1.9) $ 155.6Same Store SG&A as % gross profit (1) 79.2% 77.9%

(1)Adjusted SG&A as % of gross profit excludes the impact of SG&A reconciling items above.

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SOURCE Group 1 Automotive, Inc.

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