Group 1 Automotive Reports Third Quarter 2025 Financial Results

— Current quarter diluted earnings per common share from continuing operations of $1.02 and current quarter adjusted diluted earnings per common share from continuing operations (a non-GAAP measure) of $10.45

— Record quarterly revenues of $5.8 billion, a 10.8% increase over the comparable prior-year quarter, driven by record quarterly used vehicle retail revenues of $1.9 billion

— Parts and service revenues and gross profit, both quarterly records, increased 11.2% and 11.1%, respectively, over the comparable prior-year quarter

Group 1 Automotive, Inc. (NYSE: GPI)(“Group 1” or the “Company”),a Fortune 250 automotive retailer with 259 dealerships located in the U.S. and U.K., today reported financial results for the third quarter of 2025 (“current quarter”).

“Our U.S. business once again delivered outstanding results across every major business line, underscoring the exceptional execution of our teams and the strength of our diversified business model,” said Daryl Kenningham, Group 1's President and Chief Executive Officer. “Used vehicles, aftersales and F&I each achieved record performance, with aftersales supported by continued momentum in customer pay and warranty work. New and used vehicle sales grew year over year, reflecting healthy consumer demand. We also added to our premium brand portfolio with the acquisition of a Mercedes-Benz dealership in Georgia, reinforcing our strategy of disciplined growth in key cluster markets.”

“The U.K. market remains challenging, with softer industry volumes and continued BEV-related margin pressure.We are taking stepsto strengthen our U.K. portfolio, and we continue restructuring efforts to make the business more efficient. With our portfolio optimization efforts, including leveraging Aftersales and F&I as growth levers, we will be positioned to emerge stronger as the market stabilizes.”

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 $5.8 billion, a 10.8% increase compared to $5.2 billion for the third quarter of 2024 (“prior-year quarter”).

— Net income from continuing operations for the current quarter was $13.1 million, compared to $117.1 million for the prior-year quarter.

— Current quarter adjusted net income from continuing operations (a non-GAAP measure) was $135.1 million, a 1.2% increase compared to $133.5 million for the prior-year quarter.

— Current quarter diluted earnings per common share from continuing operations was $1.02, compared to $8.68 for the prior-year quarter.

— Net income from continuing operations for the current quarter included $123.9 million of goodwill, franchise rights, and fixed assets non-cash impairment charges attributable to the U.K. reporting unit.

— Current quarter adjusted diluted earnings per common share from continuing operations (a non-GAAP measure) was $10.45, a 5.6% increase compared to $9.90 for the prior-year quarter.

Third Quarter2025 Consolidated Same StoreKey Performance Metrics (a non-GAAP(year-over-year comparable period basis) measure)Reported: 3Q25 Change 3Q25 ChangeTotal revenues $5.8B +10.8% $5.4B +6.3%Total gross profit (“GP”) $919.7M +7.9% $866.2M +4.2%NV units sold 57,269 +6.5% 53,683 +2.8%NV GP per retail unit (“PRU”) $3,250 (4.6)% $3,226 (6.1)%Used vehicle (“UV”) retail units sold 59,574 +6.6% 55,153 +2.9%UV retail GP PRU $1,433 (9.0)% $1,441 (8.5)%Parts & service (“P&S”) GP $407.6M +11.1% $381.8M +6.9%P&S Gross Margin (“GM”) 55.5% (0.1)% 55.3% (0.2)%Finance and Insurance (“F&I”) revenues $240.9M +12.5% $231.1M +10.3%F&I GP PRU $2,061 +5.6% $2,123 +7.3%Selling, General and Administrative (“SG&A”) expenses as a % of GP 71.2% +183 bps 70.4% +142 bpsAdjusted SG&A expenses (a non-GAAP measure) as a % of GP 70.1% +259 bps 69.2% +216 bps

U.K. Update

The U.K. economy continues to face challenges, including persistent inflation, elevated interest rates, rising energy costs and a slowdown in consumer spending. These factors have contributed to margin compression and increased operating expenses within the automotive retail industry.

In addition, as part of our ongoing portfolio optimization, we informed our OEM partner, JLR, of our intention to sell or relinquish our U.K. JLR franchise operations. We continue to work with other OEM partners to evaluate our portfolio, which we expect will result in the sale or closure of additional points.

We completed a quantitative assessment of our U.K. reporting unit, which indicated that goodwill, intangible franchise rights, and fixed assets may be impaired as of August 31, 2025. Consequently, the Company recorded goodwill, franchise rights and fixed asset impairment charges of $123.9 million related to the U.K. for the current quarter.

The Company also recognized $1.6 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 $20.3 million in U.K. restructuring charges. The Company anticipates implementing further restructuring plans in future periods to reduce costs.

Corporate Development

During the current quarter, the Company acquired one dealership located in the U.S. The acquisition is expected to generate approximately $210million in annual revenues. Year to date, the Company has acquired and successfully integrated dealership operations with total expected annual revenues of approximately $640million. The Company remains focused on quickly and efficiently integrating acquisitions into existing operations to create value for shareholders.

Year to date, the Company's annualized revenues associated with dealership dispositions and franchise terminations totaled approximately $470 million.

Share Repurchases

During the current quarter, the Company repurchased 185,788 shares, at an average price per common share of $443.81, for a total of $82.5million, excluding excise taxes of $0.8million.

During the nine months ended September 30, 2025, the Company repurchased 587,437 shares, representing approximately 4.4% of the Company's outstanding common shares at January 1 of the current year, at an average price per common share of $425.22, for a total of $249.8million, excluding excise taxes of $1.9million.

As of September30, 2025, the Company had an aggregate 12.8million outstanding common shares and unvested restricted stock awards. As of September30, 2025, the Company had $226.3million remaining in 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.

Third Quarter2025 Earnings Conference Call Details

Group 1's senior management will host a conference call today at 9:00 a.m. ET to discuss the third 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: 1-888-317-6003International: 1-412-317-6061Passcode: 9338636

A telephonic replay will be available following the call through November 4, 2025, by dialing:

Domestic: 1-877-344-7529International: 1-412-317-0088Replay Code: 7892681

ABOUT GROUP 1 AUTOMOTIVE, INC.

Group 1 owns and operates 259 automotive dealerships, 324 franchises, and 35 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 impact of a prolonged U.S. government shutdown and 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., and their impact on new vehicle demand, (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 September 30, 2025 2024 Increase/ % Change (Decrease)REVENUES:New vehicle retail sales $ 2,807.4 $ 2,567.6 $ 239.8 9.3%Used vehicle retail sales 1,852.1 1,656.5 195.6 11.8%Used vehicle wholesale sales 148.4 123.2 25.2 20.5%Parts and service sales 733.9 660.0 73.9 11.2%Finance, insurance and other, net 240.9 214.1 26.8 12.5%Total revenues 5,782.7 5,221.4 561.3 10.8%COST OF SALES:New vehicle retail sales 2,621.3 2,384.4 236.9 9.9%Used vehicle retail sales 1,766.8 1,568.5 198.2 12.6%Used vehicle wholesale sales 148.7 122.8 25.9 21.1%Parts and service sales 326.3 293.1 33.2 11.3%Total cost of sales 4,863.0 4,368.7 494.3 11.3%GROSS PROFIT 919.7 852.7 67.0 7.9%Selling, general and administrative expenses 654.9 591.6 63.3 10.7%Depreciation and amortization expense 31.6 29.5 2.1 7.0%Asset impairments 123.9 – 123.9 100.0%Restructuring charges 1.6 – 1.6 100.0%INCOME FROM OPERATIONS 107.8 231.6 (123.8) (53.4)%Floorplan interest expense 23.7 31.1 (7.5) (24.0)%Other interest expense, net 48.0 39.8 8.2 20.6%Other expense – 1.1 (1.1) (100.0)%INCOME BEFORE INCOME TAXES 36.2 159.6 (123.4) (77.3)%Provision for income taxes 23.0 42.5 (19.4) (45.7)%Net income from continuing operations 13.1 117.1 (104.0) (88.8)%Net (loss) income from discontinued operations (0.2) 0.2 (0.4) (203.6)%NET INCOME $ 13.0 $ 117.3 $ (104.3) (88.9)%Less: Earnings allocated to participating securities 0.1 2.4 (2.2) (94.2)%Net income available to diluted common shares $ 12.8 $ 114.9 $ (102.1) (88.8)%Diluted earnings per share from continuing operations $ 1.02 $ 8.68 $ (7.66) (88.3)%Diluted (loss) earnings per share from discontinued operations $ (0.01) $ 0.01 $ (0.03) (208.1)%DILUTED EARNINGS PER SHARE $ 1.00 $ 8.69 $ (7.69) (88.5)%Weighted average dilutive common shares outstanding 12.8 13.2 (0.4) (3.2)%Weighted average participating securities 0.1 0.3 (0.1) (49.6)%Total weighted average shares 12.9 13.5 (0.6) (4.1)%Effective tax rate on continuing operations 63.7% 26.6% 37.1%

Group 1 Automotive, Inc.Condensed Consolidated Statements of Operations(Unaudited)(In millions, except per share data) Nine Months Ended September 30, 2025 2024 Increase/ % Change (Decrease)REVENUES:New vehicle retail sales $ 8,222.8 $ 7,114.3 $ 1,108.5 15.6%Used vehicle retail sales 5,455.7 4,526.5 929.3 20.5%Used vehicle wholesale sales 463.8 333.5 130.2 39.0%Parts and service sales 2,144.4 1,810.8 333.6 18.4%Finance, insurance and other, net 704.8 603.1 101.7 16.9%Total revenues 16,991.5 14,388.3 2,603.2 18.1%COST OF SALES:New vehicle retail sales 7,648.7 6,601.6 1,047.1 15.9%Used vehicle retail sales 5,180.4 4,275.7 904.7 21.2%Used vehicle wholesale sales 462.0 335.2 126.8 37.8%Parts and service sales 953.0 814.0 139.0 17.1%Total cost of sales 14,244.1 12,026.5 2,217.6 18.4%GROSS PROFIT 2,747.4 2,361.8 385.6 16.3%Selling, general and administrative expenses 1,918.2 1,564.9 353.3 22.6%Depreciation and amortization expense 89.6 81.6 8.0 9.8%Asset impairments 124.6 – 124.6 100.0%Restructuring charges 20.3 – 20.3 100.0%INCOME FROM OPERATIONS 594.7 715.4 (120.7) (16.9)%Floorplan interest expense 77.0 76.3 0.6 0.8%Other interest expense, net 130.4 102.5 27.9 27.3%Other (income) expense (0.2) 0.7 (0.9) (134.8)%INCOME BEFORE INCOME TAXES 387.5 535.8 (148.3) (27.7)%Provision for income taxes 106.8 133.5 (26.7) (20.0)%Net income from continuing operations 280.7 402.4 (121.6) (30.2)%Net income from discontinued operations 0.9 1.0 (0.1) (10.7)%NET INCOME $ 281.6 $ 403.3 $ (121.7) (30.2)%Less: Earnings allocated to participating securities 3.2 8.6 (5.4) (62.6)%Net income available to diluted common shares $ 278.4 $ 394.7 $ (116.3) (29.5)%Diluted earnings per share from continuing operations $ 21.50 $ 29.61 $ (8.10) (27.4)%Diluted earnings per share from discontinued operations $ 0.07 $ 0.07 $ (0.01) (7.1)%DILUTED EARNINGS PER SHARE $ 21.57 $ 29.68 $ (8.11) (27.3)%Weighted average dilutive common shares outstanding 12.9 13.3 (0.4) (3.0)%Weighted average participating securities 0.1 0.3 (0.1) (48.4)%Total weighted average shares 13.1 13.6 (0.5) (3.9)%Effective tax rate on continuing operations 27.6% 24.9% 2.7%

Group 1 Automotive, Inc.Additional Information – Consolidated(Unaudited) September 30, December 31, Increase/(Decrease) % Change 2025 2024SELECTED BALANCE SHEET INFORMATION:(In millions)Cash and cash equivalents $ 30.8 $ 34.4 $ (3.6) (10.5)%Inventories, net $ 2,732.9 $ 2,636.8 $ 96.1 3.6%Floorplan notes payable, net (1) $ 1,916.2 $ 2,022.1 $ (105.8) (5.2)%Total debt $ 3,465.1 $ 2,913.1 $ 552.0 18.9%Total equity $ 3,053.1 $ 2,974.3 $ 78.8 2.7%(1) Amounts are net of offset accounts of $402.9 and $288.2, respectively.

Three Months Ended September 30, Nine Months Ended September 30, 2025 2024 2025 2024NEW VEHICLE UNIT SALES GEOGRAPHIC MIX:United States 72.6% 73.8% 71.2% 78.4%United Kingdom 27.4% 26.2% 28.8% 21.6%NEW VEHICLE UNIT SALES BRAND MIX:Toyota/Lexus 26.8% 23.8% 25.5% 25.2%Volkswagen/Audi/Porsche/SEAT/SKODA 14.1% 16.3% 15.2% 14.5%BMW/MINI 12.4% 9.6% 12.1% 10.6%Mercedes-Benz/Sprinter/smart 9.1% 8.9% 8.7% 6.9%Honda/Acura 8.1% 9.4% 8.3% 9.4%Chevrolet/GMC/Buick 8.2% 9.0% 8.2% 9.2%Ford/Lincoln 7.2% 6.9% 6.9% 7.1%Hyundai/Kia/Genesis 5.7% 5.3% 5.5% 5.6%Jaguar/Land Rover 2.2% 2.3% 2.4% 2.1%Subaru 1.8% 3.2% 2.3% 3.3%Nissan 1.8% 1.9% 1.9% 2.3%Chrysler/Dodge/Jeep/RAM/Citroën/Leapmotor 1.5% 2.0% 1.6% 2.4%Mazda 1.1% 1.2% 1.1% 1.2%Other 0.1% 0.1% 0.1% 0.1% 100.0% 100.0% 100.0% 100.0%

September 30, December 31, September 30, 2025 2024 2024DAYS' SUPPLY IN INVENTORY (1):ConsolidatedNew vehicle inventory 40 44 43Used vehicle inventory 36 39 38U.S.New vehicle inventory 52 43 56Used vehicle inventory 31 29 30U.K.New vehicle inventory 20 45 23Used vehicle inventory 46 67 54(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 September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 2,807.4 $ 2,567.6 $ 239.8 9.3% $ 19.1 8.6%Used vehicle retail sales 1,852.1 1,656.5 195.6 11.8% 20.9 10.5%Used vehicle wholesale sales 148.4 123.2 25.2 20.5% 2.0 18.8%Total used 2,000.5 1,779.7 220.8 12.4% 22.9 11.1%Parts and service sales 733.9 660.0 73.9 11.2% 5.6 10.3%F&I, net 240.9 214.1 26.8 12.5% 1.2 11.9%Total revenues $ 5,782.7 $ 5,221.4 $ 561.3 10.8% $ 48.7 9.8%Gross profit:New vehicle retail sales $ 186.1 $ 183.2 $ 2.9 1.6% $ 1.4 0.8%Used vehicle retail sales 85.4 88.0 (2.6) (3.0)% 0.8 (4.0)%Used vehicle wholesale sales (0.2) 0.4 (0.6) NM (0.1) (146.7)%Total used 85.1 88.4 (3.3) (3.7)% 0.8 (4.6)%Parts and service sales 407.6 367.0 40.7 11.1% 3.1 10.2%F&I, net 240.9 214.1 26.8 12.5% 1.2 11.9%Total gross profit $ 919.7 $ 852.7 $ 67.0 7.9% $ 6.6 7.1%Gross margin:New vehicle retail sales 6.6% 7.1% (0.5)%Used vehicle retail sales 4.6% 5.3% (0.7)%Used vehicle wholesale sales (0.2)% 0.3% (0.5)%Total used 4.3% 5.0% (0.7)%Parts and service sales 55.5% 55.6% (0.1)%Total gross margin 15.9% 16.3% (0.4)%Units sold:Retail new vehicles sold (1) 57,269 53,775 3,494 6.5%Retail used vehicles sold (1) 59,574 55,907 3,667 6.6%Wholesale used vehicles sold 16,018 14,220 1,798 12.6%Total used 75,592 70,127 5,465 7.8%Average sales price per unit sold:New vehicle retail (1) $ 50,816 $ 48,390 $ 2,426 5.0% $ 342 4.3%Used vehicle retail (1) $ 31,112 $ 29,630 $ 1,482 5.0% $ 351 3.8%Gross profit per unit sold:New vehicle retail sales $ 3,250 $ 3,407 $ (157) (4.6)% $ 25 (5.3)%Used vehicle retail sales $ 1,433 $ 1,574 $ (141) (9.0)% $ 14 (9.9)%Used vehicle wholesale sales $ (15) $ 28 $ (44) NM $ (4) (141.5)%Total used $ 1,126 $ 1,261 $ (135) (10.7)% $ 10 (11.5)%F&I PRU $ 2,061 $ 1,952 $ 109 5.6% $ 11 5.1%Other:SG&A expenses $ 654.9 $ 591.6 $ 63.3 10.7% $ 5.8 9.7%Adjusted SG&A expenses (2) $ 645.0 $ 575.9 $ 69.1 12.0% $ 5.8 11.0%SG&A as % gross profit 71.2% 69.4% 1.8%Adjusted SG&A as % gross profit (2) 70.1% 67.5% 2.6%Operating margin % 1.9% 4.4% (2.6)%Adjusted operating margin % (2) 4.2% 4.8% (0.5)%Pretax margin % 0.6% 3.1% (2.4)%Adjusted pretax margin % (2) 3.0% 3.4% (0.4)%Floorplan expense:Floorplan interest expense $ 23.7 $ 31.1 $ (7.5) (24.0)% $ 0.2 (24.7)%Less: Floorplan assistance (3) 23.5 24.1 (0.6) (2.7)% – (2.7)%Net floorplan expense $ 0.2 $ 7.0 $ (6.8) $ 0.2

(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) Nine Months Ended September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 8,222.8 $ 7,114.3 $ 1,108.5 15.6% $ 46.6 14.9%Used vehicle retail sales 5,455.7 4,526.5 929.3 20.5% 46.0 19.5%Used vehicle wholesale sales 463.8 333.5 130.2 39.0% 5.3 37.5%Total used 5,919.5 4,860.0 1,059.5 21.8% 51.3 20.7%Parts and service sales 2,144.4 1,810.8 333.6 18.4% 11.8 17.8%F&I, net 704.8 603.1 101.7 16.9% 2.7 16.4%Total revenues $ 16,991.5 $ 14,388.3 $ 2,603.2 18.1% $ 112.3 17.3%Gross profit:New vehicle retail sales $ 574.1 $ 512.8 $ 61.4 12.0% $ 3.5 11.3%Used vehicle retail sales 275.3 250.8 24.6 9.8% 1.8 9.1%Used vehicle wholesale sales 1.8 (1.6) 3.4 NM (0.2) NMTotal used 277.1 249.1 28.0 11.2% 1.6 10.6%Parts and service sales 1,191.4 996.8 194.5 19.5% 6.8 18.8%F&I, net 704.8 603.1 101.7 16.9% 2.7 16.4%Total gross profit $ 2,747.4 $ 2,361.8 $ 385.6 16.3% $ 14.6 15.7%Gross margin:New vehicle retail sales 7.0% 7.2% (0.2)%Used vehicle retail sales 5.0% 5.5% (0.5)%Used vehicle wholesale sales 0.4% (0.5)% 0.9%Total used 4.7% 5.1% (0.4)%Parts and service sales 55.6% 55.0% 0.5%Total gross margin 16.2% 16.4% (0.2)%Units sold:Retail new vehicles sold (1) 169,131 145,738 23,393 16.1%Retail used vehicles sold (1) 179,432 154,350 25,082 16.3%Wholesale used vehicles sold 49,402 37,867 11,535 30.5%Total used 228,834 192,217 36,617 19.0%Average sales price per unit sold:New vehicle retail (1) $ 50,415 $ 49,318 $ 1,097 2.2% $ 283 1.7%Used vehicle retail (1) $ 30,425 $ 29,326 $ 1,099 3.7% $ 257 2.9%Gross profit per unit sold:New vehicle retail sales $ 3,394 $ 3,518 $ (124) (3.5)% $ 21 (4.1)%Used vehicle retail sales $ 1,534 $ 1,625 $ (90) (5.5)% $ 10 (6.2)%Used vehicle wholesale sales $ 36 $ (43) $ 79 NM $ (3) NMTotal used $ 1,211 $ 1,296 $ (85) (6.6)% $ 7 (7.1)%F&I PRU $ 2,022 $ 2,010 $ 12 0.6% $ 8 0.2%Other:SG&A expenses $ 1,918.2 $ 1,564.9 $ 353.3 22.6% $ 12.1 21.8%Adjusted SG&A expenses (2) $ 1,907.8 $ 1,584.2 $ 323.6 20.4% $ 12.3 19.7%SG&A as % gross profit 69.8% 66.3% 3.6%Adjusted SG&A as % gross profit (2) 69.4% 67.1% 2.4%Operating margin % 3.5% 5.0% (1.5)%Adjusted operating margin % (2) 4.4% 4.9% (0.4)%Pretax margin % 2.3% 3.7% (1.4)%Adjusted pretax margin % (2) 3.2% 3.6% (0.4)%Floorplan expense:Floorplan interest expense $ 77.0 $ 76.3 $ 0.6 0.8% $ 0.4 0.3%Less: Floorplan assistance (3) 66.5 63.4 3.1 4.8% – 4.8%Net floorplan expense $ 10.5 $ 12.9 $ (2.4) $ 0.4

Group 1 Automotive, Inc.Reported Operating Data – U.S.(Unaudited)(In millions, except unit data) Three Months Ended September 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 2,187.0 $ 2,016.8 $ 170.2 8.4%Used vehicle retail sales 1,230.4 1,158.4 72.0 6.2%Used vehicle wholesale sales 90.9 82.9 8.1 9.7%Total used 1,321.3 1,241.2 80.1 6.4%Parts and service sales 567.6 528.4 39.1 7.4%F&I, net 202.1 184.6 17.4 9.4%Total revenues $ 4,277.9 $ 3,971.1 $ 306.8 7.7%Gross profit:New vehicle retail sales $ 138.1 $ 140.2 $ (2.1) (1.5)%Used vehicle retail sales 60.6 61.2 (0.6) (1.0)%Used vehicle wholesale sales 1.1 1.3 (0.2) (15.5)%Total used 61.7 62.5 (0.8) (1.3)%Parts and service sales 313.1 290.8 22.3 7.7%F&I, net 202.1 184.6 17.4 9.4%Total gross profit $ 715.0 $ 678.1 $ 36.9 5.4%Gross margin:New vehicle retail sales 6.3% 7.0% (0.6)%Used vehicle retail sales 4.9% 5.3% (0.4)%Used vehicle wholesale sales 1.2% 1.5% (0.4)%Total used 4.7% 5.0% (0.4)%Parts and service sales 55.2% 55.0% 0.1%Total gross margin 16.7% 17.1% (0.4)%Units sold:Retail new vehicles sold 41,582 39,700 1,882 4.7%Retail used vehicles sold 39,636 38,775 861 2.2%Wholesale used vehicles sold 9,984 9,577 407 4.2%Total used 49,620 48,352 1,268 2.6%Average sales price per unit sold:New vehicle retail $ 52,595 $ 50,801 $ 1,794 3.5%Used vehicle retail $ 31,042 $ 29,874 $ 1,168 3.9%Gross profit per unit sold:New vehicle retail sales $ 3,322 $ 3,532 $ (210) (5.9)%Used vehicle retail sales $ 1,529 $ 1,579 $ (50) (3.1)%Used vehicle wholesale sales $ 108 $ 133 $ (25) (18.9)%Total used $ 1,243 $ 1,293 $ (49) (3.8)%F&I PRU $ 2,488 $ 2,353 $ 135 5.7%Other:SG&A expenses $ 481.2 $ 445.4 $ 35.7 8.0%Adjusted SG&A expenses (1) $ 470.7 $ 436.2 $ 34.4 7.9%SG&A as % gross profit 67.3% 65.7% 1.6%Adjusted SG&A as % gross profit (1) 65.8% 64.3% 1.5%

(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.S.(Unaudited)(In millions, except unit data) Nine Months Ended September 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 6,288.7 $ 5,826.2 $ 462.5 7.9%Used vehicle retail sales 3,577.9 3,409.7 168.2 4.9%Used vehicle wholesale sales 269.4 241.2 28.2 11.7%Total used 3,847.3 3,650.9 196.4 5.4%Parts and service sales 1,654.4 1,521.0 133.4 8.8%F&I, net 586.5 539.9 46.6 8.6%Total revenues $ 12,376.9 $ 11,538.0 $ 838.8 7.3%Gross profit:New vehicle retail sales $ 419.2 $ 416.4 $ 2.9 0.7%Used vehicle retail sales 195.0 193.7 1.4 0.7%Used vehicle wholesale sales 6.2 3.9 2.2 55.8%Total used 201.2 197.6 3.6 1.8%Parts and service sales 911.8 831.1 80.7 9.7%F&I, net 586.5 539.9 46.6 8.6%Total gross profit $ 2,118.7 $ 1,985.0 $ 133.7 6.7%Gross margin:New vehicle retail sales 6.7% 7.1% (0.5)%Used vehicle retail sales 5.5% 5.7% (0.2)%Used vehicle wholesale sales 2.3% 1.6% 0.6%Total used 5.2% 5.4% (0.2)%Parts and service sales 55.1% 54.6% 0.5%Total gross margin 17.1% 17.2% (0.1)%Units sold:Retail new vehicles sold 120,484 114,314 6,170 5.4%Retail used vehicles sold 117,914 115,271 2,643 2.3%Wholesale used vehicles sold 29,862 27,629 2,233 8.1%Total used 147,776 142,900 4,876 3.4%Average sales price per unit sold:New vehicle retail $ 52,195 $ 50,967 $ 1,228 2.4%Used vehicle retail $ 30,344 $ 29,580 $ 763 2.6%Gross profit per unit sold:New vehicle retail sales $ 3,479 $ 3,642 $ (163) (4.5)%Used vehicle retail sales $ 1,654 $ 1,680 $ (26) (1.6)%Used vehicle wholesale sales $ 206 $ 143 $ 63 44.1%Total used $ 1,361 $ 1,383 $ (22) (1.6)%F&I PRU $ 2,460 $ 2,352 $ 109 4.6%Other:SG&A expenses $ 1,400.2 $ 1,257.9 $ 142.2 11.3%Adjusted SG&A expenses (1) $ 1,390.1 $ 1,286.2 $ 103.9 8.1%SG&A as % gross profit 66.1% 63.4% 2.7%Adjusted SG&A as % gross profit (1) 65.6% 64.8% 0.8%

(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 September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 620.4 $ 550.7 $ 69.6 12.6% $ 19.1 9.2%Used vehicle retail sales 621.8 498.2 123.6 24.8% 20.9 20.6%Used vehicle wholesale sales 57.5 40.3 17.2 42.6% 2.0 37.6%Total used 679.3 538.5 140.8 26.1% 22.9 21.9%Parts and service sales 166.3 131.6 34.8 26.4% 5.6 22.1%F&I, net 38.8 29.4 9.4 31.8% 1.2 27.6%Total revenues $ 1,504.8 $ 1,250.3 $ 254.5 20.4% $ 48.7 16.5%Gross profit:New vehicle retail sales $ 48.0 $ 43.0 $ 5.0 11.6% $ 1.4 8.3%Used vehicle retail sales 24.8 26.8 (2.0) (7.6)% 0.8 (10.7)%Used vehicle wholesale sales (1.3) (0.9) (0.5) (52.0)% (0.1) (45.1)%Total used 23.4 25.9 (2.5) (9.6)% 0.8 (12.6)%Parts and service sales 94.5 76.2 18.3 24.1% 3.1 19.9%F&I, net 38.8 29.4 9.4 31.8% 1.2 27.6%Total gross profit $ 204.7 $ 174.5 $ 30.2 17.3% $ 6.6 13.5%Gross margin:New vehicle retail sales 7.7% 7.8% (0.1)%Used vehicle retail sales 4.0% 5.4% (1.4)%Used vehicle wholesale sales (2.3)% (2.2)% (0.1)%Total used 3.5% 4.8% (1.4)%Parts and service sales 56.8% 57.9% (1.1)%Total gross margin 13.6% 14.0% (0.4)%Units sold:Retail new vehicles sold (1) 15,687 14,075 1,612 11.5%Retail used vehicles sold (1) 19,938 17,132 2,806 16.4%Wholesale used vehicles sold 6,034 4,643 1,391 30.0%Total used 25,972 21,775 4,197 19.3%Average sales price per unit sold:New vehicle retail (1) $ 45,326 $ 41,188 $ 4,138 10.0% $ 1,397 6.7%Used vehicle retail (1) $ 31,251 $ 29,078 $ 2,173 7.5% $ 1,049 3.9%Gross profit per unit sold:New vehicle retail sales $ 3,059 $ 3,055 $ 4 0.1% $ 90 (2.8)%Used vehicle retail sales $ 1,242 $ 1,563 $ (322) (20.6)% $ 42 (23.3)%Used vehicle wholesale sales $ (219) $ (187) $ (32) (16.9)% $ (10) (11.7)%Total used $ 902 $ 1,190 $ (288) (24.2)% $ 30 (26.7)%F&I PRU $ 1,089 $ 944 $ 145 15.4% $ 35 11.8%Other:SG&A expenses $ 173.7 $ 146.1 $ 27.6 18.9% $ 5.8 14.9%Adjusted SG&A expenses (2) $ 174.3 $ 139.6 $ 34.7 24.8% $ 5.8 20.7%SG&A as % gross profit 84.9% 83.7% 1.1%Adjusted SG&A as % gross profit (2) 85.2% 80.0% 5.2%

Group 1 Automotive, Inc.Reported Operating Data – U.K.(Unaudited)(In millions, except unit data) Nine Months Ended September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 1,934.1 $ 1,288.2 $ 646.0 50.1% $ 46.6 46.5%Used vehicle retail sales 1,877.8 1,116.7 761.1 68.1% 46.0 64.0%Used vehicle wholesale sales 194.4 92.3 102.0 110.5% 5.3 104.8%Total used 2,072.2 1,209.1 863.1 71.4% 51.3 67.1%Parts and service sales 490.0 289.8 200.2 69.1% 11.8 65.0%F&I, net 118.3 63.2 55.1 87.2% 2.7 82.9%Total revenues $ 4,614.6 $ 2,850.2 $ 1,764.4 61.9% $ 112.3 58.0%Gross profit:New vehicle retail sales $ 154.9 $ 96.4 $ 58.5 60.7% $ 3.5 57.1%Used vehicle retail sales 80.3 57.1 23.2 40.7% 1.8 37.5%Used vehicle wholesale sales (4.4) (5.6) 1.2 21.6% (0.2) 24.3%Total used 75.9 51.5 24.4 47.4% 1.6 44.2%Parts and service sales 279.6 165.7 113.9 68.7% 6.8 64.6%F&I, net 118.3 63.2 55.1 87.2% 2.7 82.9%Total gross profit $ 628.8 $ 376.8 $ 251.9 66.9% $ 14.6 63.0%Gross margin:New vehicle retail sales 8.0% 7.5% 0.5%Used vehicle retail sales 4.3% 5.1% (0.8)%Used vehicle wholesale sales (2.3)% (6.0)% 3.8%Total used 3.7% 4.3% (0.6)%Parts and service sales 57.1% 57.2% (0.1)%Total gross margin 13.6% 13.2% 0.4%Units sold:Retail new vehicles sold (1) 48,647 31,424 17,223 54.8%Retail used vehicles sold (1) 61,518 39,079 22,439 57.4%Wholesale used vehicles sold 19,540 10,238 9,302 90.9%Total used 81,058 49,317 31,741 64.4%Average sales price per unit sold:New vehicle retail (1) $ 45,327 $ 43,001 $ 2,325 5.4% $ 1,091 2.9%Used vehicle retail (1) $ 30,582 $ 28,577 $ 2,005 7.0% $ 750 4.4%Gross profit per unit sold:New vehicle retail sales $ 3,184 $ 3,067 $ 117 3.8% $ 72 1.5%Used vehicle retail sales $ 1,305 $ 1,461 $ (155) (10.6)% $ 29 (12.6)%Used vehicle wholesale sales $ (224) $ (545) $ 321 58.9% $ (8) 60.4%Total used $ 937 $ 1,044 $ (108) (10.3)% $ 20 (12.2)%F&I PRU $ 1,074 $ 897 $ 178 19.8% $ 25 17.1%Other:SG&A expenses $ 518.1 $ 307.0 $ 211.1 68.8% $ 12.1 64.8%Adjusted SG&A expenses (2) $ 517.7 $ 298.0 $ 219.7 73.7% $ 12.3 69.6%SG&A as % gross profit 82.4% 81.5% 0.9%Adjusted SG&A as % gross profit (2) 82.3% 79.1% 3.3%

Group 1 Automotive, Inc.Same Store Operating Data – Consolidated(Unaudited)(In millions, except unit data) Three Months Ended September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 2,644.7 $ 2,511.9 $ 132.8 5.3% $ 16.2 4.6%Used vehicle retail sales 1,707.6 1,604.4 103.2 6.4% 17.3 5.4%Used vehicle wholesale sales 134.6 118.3 16.3 13.8% 1.7 12.4%Total used 1,842.2 1,722.7 119.5 6.9% 19.0 5.8%Parts and service sales 691.0 644.3 46.7 7.3% 4.6 6.5%F&I, net 231.1 209.4 21.6 10.3% 1.0 9.8%Total revenues $ 5,409.0 $ 5,088.3 $ 320.6 6.3% $ 40.6 5.5%Gross profit:New vehicle retail sales $ 173.2 $ 179.5 $ (6.3) (3.5)% $ 1.2 (4.2)%Used vehicle retail sales 79.5 84.4 (4.9) (5.8)% 0.7 (6.7)%Used vehicle wholesale sales 0.7 0.5 0.1 26.4% – 30.3%Total used 80.2 85.0 (4.8) (5.6)% 0.7 (6.4)%Parts and service sales 381.8 357.1 24.7 6.9% 2.5 6.2%F&I, net 231.1 209.4 21.6 10.3% 1.0 9.8%Total gross profit $ 866.2 $ 831.0 $ 35.2 4.2% $ 5.4 3.6%Gross margin:New vehicle retail sales 6.5% 7.1% (0.6)%Used vehicle retail sales 4.7% 5.3% (0.6)%Used vehicle wholesale sales 0.5% 0.5% 0.1%Total used 4.4% 4.9% (0.6)%Parts and service sales 55.3% 55.4% (0.2)%Total gross margin 16.0% 16.3% (0.3)%Units sold:Retail new vehicles sold (1) 53,683 52,245 1,438 2.8%Retail used vehicles sold (1) 55,153 53,603 1,550 2.9%Wholesale used vehicles sold 14,722 13,492 1,230 9.1%Total used 69,875 67,095 2,780 4.1%Average sales price per unit sold:New vehicle retail (1) $ 50,881 $ 48,747 $ 2,134 4.4% $ 307 3.7%Used vehicle retail (1) $ 30,981 $ 29,931 $ 1,050 3.5% $ 314 2.5%Gross profit per unit sold:New vehicle retail sales $ 3,226 $ 3,436 $ (210) (6.1)% $ 22 (6.8)%Used vehicle retail sales $ 1,441 $ 1,575 $ (134) (8.5)% $ 12 (9.3)%Used vehicle wholesale sales $ 47 $ 41 $ 6 15.8% $ (1) 19.5%Total used $ 1,147 $ 1,266 $ (119) (9.4)% $ 10 (10.1)%F&I PRU $ 2,123 $ 1,979 $ 144 7.3% $ 10 6.8%Other:SG&A expenses $ 610.1 $ 573.5 $ 36.6 6.4% $ 4.8 5.5%Adjusted SG&A expenses (2) $ 599.6 $ 557.3 $ 42.3 7.6% $ 4.8 6.7%SG&A as % gross profit 70.4% 69.0% 1.4%Adjusted SG&A as % gross profit (2)69.2% 67.1% 2.2%Operating margin % 4.2% 4.5% (0.3)%Adjusted operating margin % (2) 4.4% 4.8% (0.4)%

Group 1 Automotive, Inc.Same Store Operating Data – Consolidated(Unaudited)(In millions, except unit data) Nine Months Ended September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 7,380.1 $ 6,974.3 $ 405.8 5.8% $ 34.9 5.3%Used vehicle retail sales 4,677.2 4,432.2 245.0 5.5% 33.9 4.8%Used vehicle wholesale sales 372.4 324.7 47.7 14.7% 3.5 13.6%Total used 5,049.6 4,756.9 292.7 6.2% 37.4 5.4%Parts and service sales 1,914.7 1,769.9 144.8 8.2% 8.4 7.7%F&I, net 651.8 592.6 59.2 10.0% 2.1 9.6%Total revenues $ 14,996.2 $ 14,093.7 $ 902.5 6.4% $ 82.7 5.8%Gross profit:New vehicle retail sales $ 495.6 $ 502.5 $ (6.9) (1.4)% $ 2.6 (1.9)%Used vehicle retail sales 241.5 244.5 (2.9) (1.2)% 1.4 (1.8)%Used vehicle wholesale sales 4.0 (1.6) 5.7 NM (0.1) NMTotal used 245.6 242.8 2.8 1.1% 1.3 0.6%Parts and service sales 1,059.6 973.4 86.3 8.9% 4.8 8.4%F&I, net 651.8 592.6 59.2 10.0% 2.1 9.6%Total gross profit $ 2,452.6 $ 2,311.3 $ 141.3 6.1% $ 10.7 5.7%Gross margin:New vehicle retail sales 6.7% 7.2% (0.5)%Used vehicle retail sales 5.2% 5.5% (0.4)%Used vehicle wholesale sales 1.1% (0.5)% 1.6%Total used 4.9% 5.1% (0.2)%Parts and service sales 55.3% 55.0% 0.3%Total gross margin 16.4% 16.4% -%Units sold:Retail new vehicles sold (1) 147,646 142,278 5,368 3.8%Retail used vehicles sold (1) 155,301 150,437 4,864 3.2%Wholesale used vehicles sold 41,118 36,574 4,544 12.4%Total used 196,419 187,011 9,408 5.0%Average sales price per unit sold:New vehicle retail (1) $ 50,894 $ 49,536 $ 1,358 2.7% $ 238 2.3%Used vehicle retail (1) $ 30,134 $ 29,462 $ 671 2.3% $ 218 1.5%Gross profit per unit sold:New vehicle retail sales $ 3,356 $ 3,532 $ (175) (5.0)% $ 18 (5.5)%Used vehicle retail sales $ 1,555 $ 1,625 $ (70) (4.3)% $ 9 (4.8)%Used vehicle wholesale sales $ 98 $ (45) $ 143 NM $ (3) NMTotal used $ 1,250 $ 1,298 $ (48) (3.7)% $ 7 (4.2)%F&I PRU $ 2,152 $ 2,025 $ 127 6.3% $ 7 5.9%Other:SG&A expenses $ 1,684.9 $ 1,573.2 $ 111.7 7.1% $ 8.8 6.5%Adjusted SG&A expenses (2) $ 1,666.8 $ 1,539.5 $ 127.2 8.3% $ 8.9 7.7%SG&A as % gross profit 68.7% 68.1% 0.6%Adjusted SG&A as % gross profit (2)68.0% 66.6% 1.3%Operating margin % 4.6% 4.7% (0.1)%Adjusted operating margin % (2) 4.7% 5.0% (0.2)%

Group 1 Automotive, Inc.Same Store Operating Data – U.S.(Unaudited)(In millions, except unit data) Three Months Ended September 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 2,119.2 $ 1,970.1 $ 149.1 7.6%Used vehicle retail sales 1,191.4 1,130.1 61.3 5.4%Used vehicle wholesale sales 87.5 79.7 7.8 9.8%Total used 1,278.9 1,209.8 69.1 5.7%Parts and service sales 555.8 517.9 37.9 7.3%F&I, net 198.2 181.1 17.0 9.4%Total revenues $ 4,152.1 $ 3,879.0 $ 273.1 7.0%Gross profit:New vehicle retail sales $ 132.7 $ 138.0 $ (5.3) (3.8)%Used vehicle retail sales 59.3 59.7 (0.4) (0.6)%Used vehicle wholesale sales 1.2 1.3 (0.1) (9.5)%Total used 60.5 61.0 (0.5) (0.8)%Parts and service sales 306.4 284.1 22.3 7.9%F&I, net 198.2 181.1 17.0 9.4%Total gross profit $ 697.7 $ 664.2 $ 33.6 5.1%Gross margin:New vehicle retail sales 6.3% 7.0% (0.7)%Used vehicle retail sales 5.0% 5.3% (0.3)%Used vehicle wholesale sales 1.3% 1.6% (0.3)%Total used 4.7% 5.0% (0.3)%Parts and service sales 55.1% 54.8% 0.3%Total gross margin 16.8% 17.1% (0.3)%Units sold:Retail new vehicles sold 40,535 38,491 2,044 5.3%Retail used vehicles sold 38,552 37,613 939 2.5%Wholesale used vehicles sold 9,707 9,162 545 5.9%Total used 48,259 46,775 1,484 3.2%Average sales price per unit sold:New vehicle retail $ 52,281 $ 51,184 $ 1,097 2.1%Used vehicle retail $ 30,904 $ 30,046 $ 858 2.9%Gross profit per unit sold:New vehicle retail sales $ 3,274 $ 3,585 $ (311) (8.7)%Used vehicle retail sales $ 1,538 $ 1,587 $ (48) (3.0)%Used vehicle wholesale sales $ 119 $ 139 $ (20) (14.5)%Total used $ 1,253 $ 1,303 $ (50) (3.9)%F&I PRU $ 2,506 $ 2,380 $ 126 5.3%Other:SG&A expenses $ 466.7 $ 434.8 $ 31.9 7.3%Adjusted SG&A expenses (1) $ 456.2 $ 425.0 $ 31.1 7.3%SG&A as % gross profit 66.9% 65.5% 1.4%Adjusted SG&A as % gross profit (1) 65.4% 64.0% 1.4%

(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) Nine Months Ended September 30, 2025 2024 Increase/ % Change (Decrease)Revenues:New vehicle retail sales $ 6,113.0 $ 5,695.1 $ 417.8 7.3%Used vehicle retail sales 3,490.1 3,339.4 150.8 4.5%Used vehicle wholesale sales 261.5 234.0 27.5 11.7%Total used 3,751.7 3,573.4 178.3 5.0%Parts and service sales 1,618.5 1,491.1 127.5 8.5%F&I, net 575.9 530.6 45.3 8.5%Total revenues $ 12,059.0 $ 11,290.2 $ 768.9 6.8%Gross profit:New vehicle retail sales $ 403.1 $ 407.6 $ (4.5) (1.1)%Used vehicle retail sales 190.8 189.4 1.4 0.7%Used vehicle wholesale sales 6.1 3.8 2.3 61.2%Total used 196.9 193.2 3.7 1.9%Parts and service sales 889.9 813.4 76.4 9.4%F&I, net 575.9 530.6 45.3 8.5%Total gross profit $ 2,065.7 $ 1,944.8 $ 120.9 6.2%Gross margin:New vehicle retail sales 6.6% 7.2% (0.6)%Used vehicle retail sales 5.5% 5.7% (0.2)%Used vehicle wholesale sales 2.3% 1.6% 0.7%Total used 5.2% 5.4% (0.2)%Parts and service sales 55.0% 54.6% 0.4%Total gross margin 17.1% 17.2% (0.1)%Units sold:Retail new vehicles sold 117,290 111,175 6,115 5.5%Retail used vehicles sold 115,225 112,500 2,725 2.4%Wholesale used vehicles sold 29,083 26,649 2,434 9.1%Total used 144,308 139,149 5,159 3.7%Average sales price per unit sold:New vehicle retail $ 52,118 $ 51,227 $ 892 1.7%Used vehicle retail $ 30,290 $ 29,683 $ 607 2.0%Gross profit per unit sold:New vehicle retail sales $ 3,437 $ 3,666 $ (229) (6.3)%Used vehicle retail sales $ 1,656 $ 1,684 $ (28) (1.7)%Used vehicle wholesale sales $ 210 $ 142 $ 68 47.7%Total used $ 1,364 $ 1,389 $ (24) (1.7)%F&I PRU $ 2,477 $ 2,372 $ 105 4.4%Other:SG&A expenses $ 1,368.8 $ 1,276.3 $ 92.5 7.2%Adjusted SG&A expenses (1) $ 1,351.7 $ 1,251.7 $ 100.0 8.0%SG&A as % gross profit 66.3% 65.6% 0.6%Adjusted SG&A as % gross profit (1) 65.4% 64.4% 1.1%

(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 September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 525.5 $ 541.8 $ (16.3) (3.0)% $ 16.2 (6.0)%Used vehicle retail sales 516.1 474.3 41.9 8.8% 17.3 5.2%Used vehicle wholesale sales 47.1 38.6 8.5 22.0% 1.7 17.7%Total used 563.3 512.9 50.4 9.8% 19.0 6.1%Parts and service sales 135.2 126.4 8.9 7.0% 4.6 3.4%F&I, net 32.9 28.3 4.6 16.3% 1.0 12.6%Total revenues $ 1,256.9 $ 1,209.3 $ 47.5 3.9% $ 40.6 0.6%Gross profit:New vehicle retail sales $ 40.5 $ 41.5 $ (1.1) (2.5)% $ 1.2 (5.4)%Used vehicle retail sales 20.2 24.7 (4.6) (18.4)% 0.7 (21.2)%Used vehicle wholesale sales (0.5) (0.7) 0.3 36.3% – 39.3%Total used 19.7 24.0 (4.3) (17.9)% 0.7 (20.7)%Parts and service sales 75.4 73.0 2.4 3.3% 2.5 (0.2)%F&I, net 32.9 28.3 4.6 16.3% 1.0 12.6%Total gross profit $ 168.5 $ 166.8 $ 1.6 1.0% $ 5.4 (2.3)%Gross margin:New vehicle retail sales 7.7% 7.7% -%Used vehicle retail sales 3.9% 5.2% (1.3)%Used vehicle wholesale sales (1.0)% (1.9)% 0.9%Total used 3.5% 4.7% (1.2)%Parts and service sales 55.8% 57.8% (2.0)%Total gross margin 13.4% 13.8% (0.4)%Units sold:Retail new vehicles sold (1) 13,148 13,754 (606) (4.4)%Retail used vehicles sold (1) 16,601 15,990 611 3.8%Wholesale used vehicles sold 5,015 4,330 685 15.8%Total used 21,616 20,320 1,296 6.4%Average sales price per unit sold:New vehicle retail (1) $ 45,853 $ 41,517 $ 4,336 10.4% $ 1,411 7.0%Used vehicle retail (1) $ 31,160 $ 29,660 $ 1,499 5.1% $ 1,045 1.5%Gross profit per unit sold:New vehicle retail sales $ 3,077 $ 3,019 $ 59 1.9% $ 90 (1.0)%Used vehicle retail sales $ 1,215 $ 1,547 $ (332) (21.4)% $ 41 (24.1)%Used vehicle wholesale sales $ (92) $ (168) $ 76 45.0% $ (4) 47.6%Total used $ 912 $ 1,182 $ (270) (22.8)% $ 31 (25.4)%F&I PRU $ 1,106 $ 952 $ 155 16.2% $ 35 12.6%Other:SG&A expenses $ 143.4 $ 138.7 $ 4.7 3.4% $ 4.8 (0.1)%Adjusted SG&A expenses (2) $ 143.4 $ 132.2 $ 11.2 8.5% $ 4.8 4.8%SG&A as % gross profit 85.1% 83.1% 2.0%Adjusted SG&A as % gross profit (2) 85.1% 79.3% 5.9%

Group 1 Automotive, Inc.Same Store Operating Data – U.K.(Unaudited)(In millions, except unit data) Nine Months Ended September 30, 2025 2024 Increase/ % Change Currency Constant (Decrease) Impact on Currency Current % Change Period ResultsRevenues:New vehicle retail sales $ 1,267.1 $ 1,279.2 $ (12.0) (0.9)% $ 34.9 (3.7)%Used vehicle retail sales 1,187.0 1,092.8 94.2 8.6% 33.9 5.5%Used vehicle wholesale sales 110.9 90.7 20.2 22.3% 3.5 18.4%Total used 1,297.9 1,183.5 114.4 9.7% 37.4 6.5%Parts and service sales 296.1 278.8 17.3 6.2% 8.4 3.2%F&I, net 76.0 62.1 13.9 22.4% 2.1 19.1%Total revenues $ 2,937.2 $ 2,803.6 $ 133.6 4.8% $ 82.7 1.8%Gross profit:New vehicle retail sales $ 92.5 $ 94.9 $ (2.4) (2.5)% $ 2.6 (5.3)%Used vehicle retail sales 50.8 55.0 (4.3) (7.8)% 1.4 (10.3)%Used vehicle wholesale sales (2.1) (5.4) 3.4 61.9% (0.1) 64.0%Total used 48.7 49.6 (0.9) (1.8)% 1.3 (4.4)%Parts and service sales 169.8 159.9 9.8 6.1% 4.8 3.1%F&I, net 76.0 62.1 13.9 22.4% 2.1 19.1%Total gross profit $ 386.9 $ 366.5 $ 20.4 5.6% $ 10.7 2.6%Gross margin:New vehicle retail sales 7.3% 7.4% (0.1)%Used vehicle retail sales 4.3% 5.0% (0.8)%Used vehicle wholesale sales (1.9)% (6.0)% 4.1%Total used 3.8% 4.2% (0.4)%Parts and service sales 57.3% 57.4% -%Total gross margin 13.2% 13.1% 0.1%Units sold:Retail new vehicles sold (1) 30,356 31,103 (747) (2.4)%Retail used vehicles sold (1) 40,076 37,937 2,139 5.6%Wholesale used vehicles sold 12,035 9,925 2,110 21.3%Total used 52,111 47,862 4,249 8.9%Average sales price per unit sold:New vehicle retail (1) $ 45,669 $ 43,166 $ 2,503 5.8% $ 1,255 2.9%Used vehicle retail (1) $ 29,684 $ 28,807 $ 877 3.0% $ 847 0.1%Gross profit per unit sold:New vehicle retail sales $ 3,047 $ 3,051 $ (4) (0.1)% $ 86 (2.9)%Used vehicle retail sales $ 1,267 $ 1,451 $ (184) (12.7)% $ 35 (15.1)%Used vehicle wholesale sales $ (172) $ (548) $ 376 68.5% $ (9) 70.3%Total used $ 934 $ 1,036 $ (102) (9.8)% $ 25 (12.2)%F&I PRU $ 1,078 $ 899 $ 179 19.9% $ 29 16.7%Other:SG&A expenses $ 316.1 $ 296.8 $ 19.2 6.5% $ 8.8 3.5%Adjusted SG&A expenses (2) $ 315.1 $ 287.8 $ 27.3 9.5% $ 8.9 6.4%SG&A as % gross profit 81.7% 81.0% 0.7%Adjusted SG&A as % gross profit (2) 81.4% 78.5% 2.9%

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Three Months Ended September 30, 2025 U.S. GAAP Catastrophic Dealership Severance Restructuring Acquisition Legal items Asset Non-GAAP events and real costs charges costs and other impairments adjusted estate professional and transactions fees accelerated depreciationSG&A expenses $ 654.9 $ 0.2 $ 0.6 $ (0.4) $ – $ (4.3) $ (6.0) $ – $ 645.0Depreciation and amortization expense $ 31.6 $ – $ – $ – $ – $ – $ – $ (1.6) $ 30.0Asset impairments $ 123.9 $ – $ – $ – $ – $ – $ – $ (123.9) $ -Restructuring charges $ 1.6 $ – $ – $ – $ (1.6) $ – $ – $ – $ -Income (loss) from operations $ 107.8 $ (0.2) $ (0.6) $ 0.4 $ 1.6 $ 4.3 $ 6.0 $ 125.5 $ 244.7Income (loss) before income taxes $ 36.2 $ (0.2) $ (0.6) $ 0.4 $ 1.6 $ 4.3 $ 6.0 $ 125.5 $ 173.1Less: Provision (benefit) for income taxes 23.0 (0.1) (0.2) 0.1 – 1.0 1.4 12.6 38.0Net income (loss) from continuing operations 13.1 (0.2) (0.5) 0.3 1.6 3.3 4.6 112.9 135.1Less: Earnings allocated to participating securities 0.1 – – – – – – 1.2 1.4Net income (loss) from continuing operations available to diluted common shares $ 13.0 $ (0.2) $ (0.5) $ 0.3 $ 1.5 $ 3.2 $ 4.5 $ 111.7 $ 133.7Diluted earnings (loss) per common share from continuing operations $ 1.02 $ (0.01) $ (0.04) $ 0.02 $ 0.12 $ 0.25 $ 0.35 $ 8.73 $ 10.45Effective tax rate 63.7% 21.9%SG&A as % gross profit (1) 71.2% 70.1%Operating margin (2) 1.9% 4.2%Pretax margin (3) 0.6% 3.0%Same Store SG&A expenses $ 610.1 $ 0.2 $ – $ (0.4) $ – $ (4.3) $ (6.0) $ – $ 599.6Same Store SG&A as % gross profit (1) 70.4% 69.2%Same Store income (loss) from operations $ 226.6 $ (0.2) $ – $ 0.4 $ – $ 4.3 $ 6.0 $ 1.6 $ 238.7Same Store operating margin (2) 4.2% 4.4%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet loss from discontinued operations $ (0.2) $ – $ (0.2)Less: Loss allocated to participating securities – – -Net loss from discontinued operations available to diluted common shares $ (0.2) $ – $ (0.2)Net income $ 13.0 $ 122.0 $ 134.9Less: Earnings allocated to participating securities 0.1 1.3 1.4Net income available to diluted common shares $ 12.8 $ 120.7 $ 133.5Diluted loss per common share from discontinued operations $ (0.01) $ – $ (0.01)Diluted earnings per common share from continuing operations 1.02 9.43 10.45Diluted earnings per common share $ 1.00 $ 9.43 $ 10.43

(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 September 30, 2024 U.S. Catastrophic Dealership Severance Acquisition Legal items Accelerated Non-GAAP GAAP events and real costs costs and other depreciation adjusted estate professional transactions feesSG&A expenses $ 591.6 $ (0.7) $ 0.6 $ (0.4) $ (14.8) $ (0.3) $ – $ 575.9Depreciation and amortization expense $ 29.5 $ – $ – $ – $ – $ – $ (1.3) $ 28.2Income (loss) from operations $ 231.6 $ 0.7 $ (0.6) $ 0.4 $ 14.8 $ 0.3 $ 1.3 $ 248.6Income (loss) before income taxes $ 159.6 $ 0.7 $ (0.6) $ 0.4 $ 14.8 $ 0.3 $ 1.3 $ 176.6Less: Provision (benefit) for income taxes 42.5 0.2 (0.8) 0.1 0.7 0.1 0.3 43.1Net income from continuing operations 117.1 0.6 0.2 0.3 14.2 0.2 1.0 133.5Less: Earnings allocated to participating securities 2.4 – – – 0.3 – – 2.7Net income from continuing operations available to diluted common shares $ 114.7 $ 0.5 $ 0.2 $ 0.3 $ 13.9 $ 0.2 $ 1.0 $ 130.8Diluted earnings per common share from continuing operations $ 8.68 $ 0.04 $ 0.01 $ 0.02 $ 1.05 $ 0.02 $ 0.07 $ 9.90Effective tax rate 26.6% 24.4%SG&A as % gross profit (1) 69.4% 67.5%Operating margin (2) 4.4% 4.8%Pretax margin (3) 3.1% 3.4%Same Store SG&A expenses $ 573.5 $ (0.7) $ – $ (0.4) $ (14.8) $ (0.3) $ – $ 557.3Same Store SG&A as % gross profit (1) 69.0% 67.1%Same Store income from operations $ 229.0 $ 0.7 $ – $ 0.4 $ 14.8 $ 0.3 $ 1.3 $ 246.6Same Store operating margin (2) 4.5% 4.8%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 0.2 $ – $ 0.2Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 0.2 $ – $ 0.2Net income $ 117.3 $ 16.4 $ 133.7Less: Earnings allocated to participating securities 2.4 0.3 2.7Net income available to diluted common shares $ 114.9 $ 16.1 $ 131.0Diluted earnings per common share from discontinued operations $ 0.01 $ – $ 0.01Diluted earnings per common share from continuing operations 8.68 1.22 9.90Diluted earnings per common share $ 8.69 $ 1.22 $ 9.91

(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) Nine Months Ended September 30, 2025 U.S. GAAP Catastrophic Dealership Severance Restructuring Acquisition Legal items Asset Non-GAAP events and real costs charges costs and other impairments adjusted estate professional and transactions fees accelerated depreciationSG&A expenses $ 1,918.2 $ (1.2) $ 7.8 $ (1.4) $ – $ (6.1) $ (9.4) $ – $ 1,907.8Depreciation and amortization expense $ 89.6 $ – $ – $ – $ – $ – $ – $ (3.0) $ 86.6Asset impairments $ 124.6 $ – $ – $ – $ – $ – $ – $ (124.6) $ -Restructuring charges $ 20.3 $ – $ – $ – $ (20.3) $ – $ – $ – $ -Income (loss) from operations $ 594.7 $ 1.2 $ (7.8) $ 1.4 $ 20.3 $ 6.1 $ 9.4 $ 127.6 $ 753.0Income (loss) before income taxes $ 387.5 $ 1.2 $ (7.8) $ 1.4 $ 20.3 $ 6.1 $ 9.4 $ 127.6 $ 545.9Less: Provision (benefit) for income taxes 106.8 0.3 (1.3) 0.1 4.0 1.2 2.3 13.1 126.4Net income (loss) from continuing operations 280.7 0.9 (6.4) 1.3 16.3 4.9 7.2 114.5 419.5Less: Earnings (loss) allocated to participating securities 3.2 – (0.1) – 0.2 0.1 0.1 1.3 4.8Net income (loss) from continuing operations available to diluted common shares $ 277.5 $ 0.9 $ (6.3) $ 1.3 $ 16.1 $ 4.8 $ 7.1 $ 113.2 $ 414.7Diluted earnings (loss) per common share from continuing operations $ 21.50 $ 0.07 $ (0.49) $ 0.10 $ 1.25 $ 0.37 $ 0.55 $ 8.77 $ 32.13Effective tax rate 27.6% 23.2%SG&A as % gross profit (1) 69.8% 69.4%Operating margin (2) 3.5% 4.4%Pretax margin (3) 2.3% 3.2%Same Store SG&A expenses $ 1,684.9 $ (1.2) $ – $ (1.4) $ – $ (6.1) $ (9.4) $ – $ 1,666.8Same Store SG&A as % gross profit (1) 68.7% 68.0%Same Store income from operations $ 688.5 $ 1.2 $ – $ 1.4 $ – $ 6.1 $ 9.4 $ 2.2 $ 708.8Same Store operating margin (2) 4.6% 4.7%

U.S. GAAP Non-GAAP Non-GAAP adjustments adjustedNet income from discontinued operations $ 0.9 $ – $ 0.9Less: Earnings allocated to participating securities – – -Net income from discontinued operations available to diluted common shares $ 0.8 $ – $ 0.8Net income $ 281.6 $ 138.8 $ 420.3Less: Earnings allocated to participating securities 3.2 1.6 4.8Net income available to diluted common shares $ 278.4 $ 137.2 $ 415.5Diluted earnings per common share from discontinued operations $ 0.07 $ – $ 0.07Diluted earnings per common share from continuing operations 21.50 10.63 32.13Diluted earnings per common share $ 21.57 $ 10.63 $ 32.20

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – Consolidated(Unaudited)(In millions, except per share data) Nine Months Ended September 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 $ 1,564.9 $ (9.8) $ 52.9 $ (1.0) $ (19.3) $ (3.5) $ – $ 1,584.2Depreciation and amortization expense $ 81.6 $ – $ – – $ – $ – $ (5.5) $ 76.1Income (loss) from operations $ 715.4 $ 9.8 $ (52.9) 1.0 $ 19.3 $ 3.5 $ 5.5 $ 701.5Income (loss) before income taxes $ 535.8 $ 9.8 $ (52.9) $ 1.0 $ 19.3 $ 3.5 $ 5.5 $ 522.0Less: Provision (benefit) for income taxes 133.5 2.4 (14.2) 0.2 1.3 0.9 1.3 125.3Net income (loss) from continuing operations 402.4 7.5 (38.7) 0.7 18.0 2.7 4.2 396.7Less: Earnings (loss) allocated to participating securities 8.6 0.2 (0.8) – 0.4 0.1 0.1 8.5Net income (loss) from continuing operations available to diluted common shares $ 393.8 $ 7.3 $ (37.9) $ 0.7 $ 17.6 $ 2.6 $ 4.1 $ 388.2Diluted earnings (loss) per common share from continuing operations $ 29.61 $ 0.55 $ (2.85) $ 0.05 $ 1.33 $ 0.20 $ 0.31 $ 29.19Effective tax rate 24.9% 24.0%SG&A as % gross profit (1) 66.3% 67.1%Operating margin (2) 5.0% 4.9%Pretax margin (3) 3.7% 3.6%Same Store SG&A expenses $ 1,573.2 $ (9.8) $ – $ (1.0) $ (19.3) $ (3.5) $ – $ 1,539.5Same Store SG&A as % gross profit (1) 68.1% 66.6%Same Store income from operations $ 659.7 $ 9.8 $ – $ 1.0 $ 19.3 $ 3.5 $ 5.5 $ 698.8Same Store operating margin (2) 4.7% 5.0%

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 $ 0.9 $ – $ 0.9Net income (loss) $ 403.3 $ (5.7) $ 397.7Less: Earnings (loss) allocated to participating securities 8.6 (0.1) 8.5Net income (loss) available to diluted common shares $ 394.7 $ (5.5) $ 389.2Diluted earnings per common share from discontinued operations $ 0.07 $ – $ 0.07Diluted earnings (loss) per common share from continuing operations 29.61 (0.42) 29.19Diluted earnings (loss) per common share $ 29.68 $ (0.42) $ 29.26

Group 1 Automotive, Inc.Reconciliation of Certain Non-GAAP Financial Measures – U.S.(Unaudited)(In millions) Three Months Ended September 30, 2025 U.S. GAAP Catastrophic Severance Acquisition Legal items Non-GAAP events costs costs and other adjusted professional feesSG&A expenses $ 481.2 $ 0.2 $ (0.4) $ (4.3) $ (6.0) $ 470.7SG&A as % gross profit (1) 67.3% 65.8%Same Store SG&A expenses $ 466.7 $ 0.2 $ (0.4) $ (4.3) $ (6.0) $ 456.2Same Store SG&A as % gross profit (1) 66.9% 65.4%

Three Months Ended September 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 $ 445.4 $ (0.7) $ 0.6 $ (8.7) $ (0.3) $ 436.2SG&A as % gross profit (1) 65.7% 64.3%Same Store SG&A expenses $ 434.8 $ (0.7) $ – $ (8.7) $ (0.3) $ 425.0Same Store SG&A as % gross profit (1) 65.5% 64.0%

Nine Months Ended September 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 $ 1,400.2 $ (1.2) $ 7.1 $ (1.4) $ (5.1) $ (9.4) $ 1,390.1SG&A as % gross profit (1) 66.1% 65.6%Same Store SG&A expenses $ 1,368.8 $ (1.2) $ – $ (1.4) $ (5.0) $ (9.4) $ 1,351.7Same Store SG&A as % gross profit (1) 66.3% 65.4%

Nine Months Ended September 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 $ 1,257.9 $ (9.8) $ 52.9 $ (11.3) $ (3.5) $ 1,286.2SG&A as % gross profit (1) 63.4% 64.8%Same Store SG&A expenses $ 1,276.3 $ (9.8) $ – $ (11.3) $ (3.5) $ 1,251.7Same Store SG&A as % gross profit (1) 65.6% 64.4%

(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 September 30, 2025 U.S. GAAP Dealership and real Non-GAAP Adjusted estate transactionsSG&A expenses $ 173.7 $ 0.6 $ 174.3SG&A as % gross profit (1) 84.9% 85.2%Same Store SG&A expenses $ 143.4 $ – $ 143.4Same Store SG&A as % gross profit (1) 85.1% 85.1%

Three Months Ended September 30, 2024 U.S. GAAP Severance costs Acquisition costs Non-GAAP AdjustedSG&A expenses $ 146.1 $ (0.4) $ (6.1) $ 139.6SG&A as % gross profit (1) 83.7% 80.0%Same Store SG&A expenses $ 138.7 $ (0.4) $ (6.1) $ 132.2Same Store SG&A as % gross profit (1) 83.1% 79.3%

Nine Months Ended September 30, 2025 U.S. GAAP Dealership Acquisition costs Non-GAAP and real estate Adjusted transactionsSG&A expenses $ 518.1 $ 0.6 $ (1.0) $ 517.7SG&A as % gross profit (1) 82.4% 82.3%Same Store SG&A expenses $ 316.1 $ – $ (1.0) $ 315.1Same Store SG&A as % gross profit (1) 81.7% 81.4%

Nine Months Ended September 30, 2024 U.S. GAAP Severance costs Acquisition costs Non-GAAP AdjustedSG&A expenses $ 307.0 $ (1.0) $ (8.0) $ 298.0SG&A as % gross profit (1) 81.5% 79.1%Same Store SG&A expenses $ 296.8 $ (1.0) $ (8.0) $ 287.8Same Store SG&A as % gross profit (1) 81.0% 78.5%

(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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