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3 • Continued process improvements • Ongoing investment in attracting and retaining talent *Based on the 2026 Pied Piper Service Scheduling Effectiveness (SSE ) Auto Dealer Group Study. Group 1 ranked #2 of 31 U.S. large dealer groups and first among publicly traded groups, behind on ly privately held MileOne **Excludes Brazil disposition
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Unique Strategic Investment – Hennessy Automobile 01 High-throughput stores create a new 15-store cluster in high-growth Atlanta 02 Luxury-focused brand mix with dominant market share in region 03 Best-in-class margins and profitability 04 Strong backing from high-quality real estate (~$210M appraised value) 5 $72M $170M Industry Average U.S. Dealership Hennessy Average Revenue Per Store $88K $150K United States Atlanta MSA Average Household Income Sources: U.S. Census Bureau – household income 0-5 mi. radius from markets, Automotive News, NADA. Appraisal as of April 2026. 29% 25% 20% 8% 7% 7% 4% Lexus JLR Porsche Honda Ford Cadillac Lincoln Revenue Mix 75% premier luxury 50% 56% NADA Average Hennessy Fixed Operations Gross Margin Proven track record of sustaining 7%+ EBITDA margins
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A Higher Margin Portfolio Post Hennessy Acquisition and Planned Dispositions Hennessy Acquisition – Closed in Q4 ~22,000 Units ~$1.7B Annualized Revenues ~7% Adjusted EBITDA Margin Planned Dispositions1– Expected Around Mid 2027 ~22,000 Units $1.1 – $1.2B Annualized Revenues ~4% GPI Adjusted EBITDA Margin2 Additional Long-Term Upside – Hennessy P&S Capacity P&S Underutilized Capacity Technicians 280 Service Bays 500 Capacity to absorb incremental P&S volume over the next few years with minimal capex 6 1As of 10/28 approximately $540 million of annualized revenues have closed or are in definitive agreement. 2GPI Adjusted EBITDA margin for nine months ending September 30, 2026. See appendix in this presentation for the reconciliation of Non-GAAP measures 3Rent-adjusted leverage ratio, as defined by our U.S. syndicated credit facility. Pro Forma Financial Impacts of Hennessy Acquisition and Planned Dispositions Adjusted EBITDA Margin ~30 bps SG&A % of Gross Profit ~100 bps Net Leverage3 ~4x Hennessy Closing and Completed October Dispositions to Date Post-Dispositions and Free Cash Flow Generation ~3x Targeted range to resume buybacks Mid to late 2027
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7 Advanced the priorities outlined in Q2: improving used vehicle sourcing, adapting our aftersales approach, executing our rebranding and aligning costs with the operating environment Disposition plan supporting our strategy to reduce leverage on track: completed U.S. dispositions with approximately $235 million in proceeds since quarter end, with an additional $125 million in proceeds expected from dispositions under definitive agreement, totaling approximately $360 million of proceeds
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$2,807 $2,665 $1,852 $1,691 $241 $216 $734 $701 3Q25 3Q26 8 Consolidated Revenues (7)% (5)% (10)% (9)% (5)% (3)% New Vehicle Retail Used Vehicle Retail Finance & Insurance Parts & Service $2,630 $2,608 $1,763 $1,659 $232 $211 $674 $687 3Q25 3Q26 (9)% $5,783 $5,397 $5,436 $5,283 2% Same Store Revenues (6)% (1)%
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26.6% 10.3% 10.2% 8.6% 8.3% 8.2% 7.3% 6.0% 2.7% 2.6% 2.4% 2.0% 1.5% 0.9% 0.3% 0.2% 1.7% Other 9 901 Group 1 Automotive 2025 Amarillo (1) Pensacola/Panama City (3) Mobile (1) New Orleans (2) Sacramento (2) San Antonio (4) Miami (1) New Hampshire (4) Charlotte (1) Philadelphia Metro (1) Columbus (4) Augusta (1) Columbia (1) Hilton Head (3) Tulsa (4) Maine (4) Atlantic City (2) Kansas City (3) Fort Myers (1) Corpus Christi (1) Santa Fe (3) Albuquerque (4) 9 Oklahoma City 7 Dallas- Ft Worth 19 Houston Austin 8Lubbock 6 El Paso 6 Los Angeles (3) 18 Boston Metro 7 Washington DC Metro 20% 51% 28% Domestic Import Luxury 22% 40% 37% Domestic Import Luxury RevenueUnits U.S. Brand Diversification *As of October 28, 2026; Sales based on YTD results as of September 30, 2026. May not add to 100% due to rounding 15 Atlanta Shreveport (2) NYC Metro (1)
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10 1001 Group 1 Automotive 2025 Bedfordshire (1) Berkshire (4) Derbyshire (3) Dorset (1) Gloucestershire (1) Lancashire (1) Leicestershire (2) Merseyside (4) Nottinghamshire (3) Shropshire (1) West Sussex (1) Warwickshire (2) Oxfordshire (1) Lincolnshire (1) 10 Essex 5 Surrey5 Hampshire 10 Greater London 5 Cambridgeshire 5 Greater Manchester 7 Cheshire 11 Hertfordshire Devon (1) North Wales (1) 3% 37% 60% Domestic Import Luxury 3% 35% 62% Domestic Import Luxury RevenueUnits 23.7% 23.5% 13.6% 12.8% 7.2% 6.9% 3.1% 2.7% 2.4% 1.6% 1.0% 1.0% 0.4% U.K. Brand Diversification Other *As of October 28, 2026 Sales based on YTD results as of September 30, 2026. May not add to 100% due to rounding East Sussex (2) 6 Kent 6 Norfolk Suffolk (4)
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11 1101 (1) 2024 American Community Survey, Household Size by Vehicles Available, United States Census
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12 1201 *Fixed absorption calculation: parts & service gross profit divided by total company fixed costs plus parts & service sellingexpenses 49% 20% 34% 9% 13% 46% 4% 25% Revenue Gross Profit 3Q26 Business Diversification Finance & Insurance Parts & Service Used Vehicles New Vehicles
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13 1301
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$2.5B $0.9B $1.1B $3.9B $0.6B $2.0B ($0.2B) ($0.3B) ($0.4B) ($0.5B) ($0.8B) ($1.3B) 2021 2022 2023 2024 2025 2026 YTD Dispositions/Terminations* Acquisitions 16 1601 * Excludes Brazil disposition $211M $521M $173M $162M $555M $72.4M $23.9M $23.7M $25.2M $25.2M $25.6M $19.7M 2021 2022 2023 2024 2025 2026 YTD Buybacks Dividends 2026 figures reflect year-to-date activity through October 28, 2026, and are not directly comparable to prior full-year periods
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17 $12,044 $10,852 $13,802 $16,412 $17,874 $19,934 $22,571 2019 2020 2021 2022 2023 2024 2025 Revenue* ($MM) $10.93 $18.06 $35.02 $45.85 $44.24 $39.29 $40.83 2019 2020 2021 2022 2023 2024 2025 Adjusted EPS* $235 $432 $659 $800 $581 $504 $485 2019 2020 2021 2022 2023 2024 2025 Adjusted FCF* ($MM)
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New Vehicle Overview U.S. New Market Size1 (MM) Annual New Vehicle Units *Includes Brazil discontinued operations 1Source: LMC Automotive/GlobalData Total New Vehicle Revenues ($MM)* +10% 2019-2025 CAGR 6,314 5,581 6,710 7,562 8,775 9,972 10,990 2019 2020 2021 2022 2023 2024 2025 17 18 17 17 17 15 15 14 16 16 16 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 GPI vs. New Vehicle Industry 3Q26 GPI U.S. Same Store Retail Unit Sales: -5% YoY 3Q26 U.S. New Market Retail Unit Sales2: -2% YoY 19 *Includes Brazil discontinued operations 1Source: LMC Automotive/GlobalData 2Source: LMC Automotive/GlobalData/J.D. Power
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U.S. Used Market Size1 (MM) Annual Used Vehicle Units 1 Source: Edmunds, Cox Automotive and NADA Used Vehicle Data 2Source: Cox Automotive *Includes Brazil discontinued operations 2Source: NADA-U.S. Used Vehicle Data 3Source: Cox Automotive +13% 2019-2025 CAGR GPI vs. Used Vehicle Industry 3Q26 GPI U.S. Same Store Retail Unit Sales: -10% YoY 3Q26 U.S. Used Market Unit Sales2: -2% YoY 3,722 3,414 4,874 6,092 6,135 6,642 7,802 2019 2020 2021 2022 2023 2024 2025 Retail Wholesale 20 Total Used Vehicle Revenues ($MM)* U.S. Units Sold: Retail Used / Retail New 0.74 0.81 0.80 0.91 0.99 1.03 1.06 1.17 1.02 0.97 0.96 0.94 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 YTD 14 14 14 14 15 14 15 13 13 13 13 13 13 14 14 14 13 14 13 13 13 13 11 11 11 11 11 10 12 10 11 12 12 38 39 39 39 40 37 41 36 36 37 38 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 New Vehicle Dealers Used Vehicle Dealers Private Party
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56% 55% 19% 21% 17% 4% 8% 6% 13% Revenue Gross Profit Internal Reconditioning Collision Wholesale Warranty Customer Pay Consolidated P&S Revenue (1) ($MM) +11% 2019-2025 CAGR Service-to- Service Retention by Model Year* 75% 79% 74% 75% 74% 73% 72% 71% 70% 67% 63% 69% 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 10+ Yrs Average *Represents vehicles having 2 service visits in 12 months. 3Q26 U.S. SS P&S Change YoY 3Q26 U.S. SS P&S Mix (2) (1) Includes Brazil discontinued operations (2) May not add to 100% due to rounding $1,510 $1,389 $ 1,630 $ 2,033 $ 2,222 $2,491 $2,845 2019 2020 2021 2022 2023 2024 2025 21 *Internal reconditioning is P&S work performed to prepare new and used vehicles for sale and generally tracks retail unit sal es. Group 1 records the related gross profit in P&S and eliminates internal revenue; classification may differ across retailers. Revenue Gross Profit Customer Pay +3% +2% Warranty +0% +3% Wholesale +1% -5% Collision -14% -12% Internal Reconditioning* Gross Profit Only -9%
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Finance & Insurance Overview U.S. F&I Gross Profit Per Retail Unit (PRU)U.S. F&I Penetration 2019 2020 2021 2022 2023 2024 2025 3Q26 YTD Finance 72% 73% 73% 70% 68% 70% 70% 71% VSC 42% 44% 45% 45% 44% 44% 45% 44% Maintenance 14% 14% 15% 18% 19% 19% 24% 26% Other 17% 17% 20% 22% 21% 23% 24% 23% $1,782 $1,951 $2,155 $2,428 $2,338 $2,368 $2,466 $2,468 2019 2020 2021 2022 2023 2024 2025 3Q26 YTD 22 * 3Q26 U.S. Same Store F&I GP PRU: -3.5% YoY
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Rent Adjusted Leverage Ratio Total Liquidity ($MM) $989 $883 $714 $684 $2,477 3Q25 4Q25 1Q26 2Q26 3Q26 $332 $504 $755 $916 $720 $683 $699 $500 $350 $235 $432 $659 $800 $581 $504 $485 $350 $219 2019 2020 2021 2022 2023 2024 2025 3Q25 YTD 3Q26 YTD Adjusted Operating Cash Flow* Adjusted Free Cash Flow* Total liquidity increased from 2Q 2026 primarily reflecting proceeds from the $1.25 billion senior notes issuance, held at quarter end to fund the Hennessy acquisition, which closed on October 19, 2026 Rent-adjusted leverage of 3.3x at 9/30; On a proforma basis for Hennessy acquisition and October closed dispositions, rent-adjusted leverage would be ~4x Disposal plan and cash generation supports deleveraging following acquisitions 23 *See Appendix for Non-GAAP Reconciliations 2.9x 3.1x 3.1x 3.3x 3.3x 3Q25 4Q25 1Q26 2Q26 3Q26
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~$2,124 million of floorplan debt ~$1,112 million of mortgage debt ~$2,500 million of bond debt ~$0 million of acquisition line debt ~$302 million of other debt including finance leases 2026 2027 2028 2029 2030 2031 Swap Balance $450 $300 $250 $200 $200 $100 Fixed Rate 1.23% 1.11% 1.10% 1.20% 1.20% 0.65% $89 $198 $930 $324 $616 $1,757 2026 2027 2028 2029 2030 Thereafter Debt Maturities in millions, excludes floorplan 24
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Region Owned Leased United States 121 24 United Kingdom 62 42 Total 183 66 Dealership Property Breakdown by Region (as of September 30, 2026) Owned vs. Leased Property Trend % Owned % Leased # Properties 63% 66% 69% 73% 37% 34% 31% 27% 2020 2022 2024 2026 167 204 259 249 25
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Appendix M&A Activity Non-GAAP Reconciliations
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Acquisitions and Dispositions/Terminations 27 Q3 2025 – Q3 2026 Annualized Revenues ($m) Acquisitions $550 Q3 2025 U.S. - 1 Mercedes Benz 210 Q1 2026 U.K. - 1 Skoda and 2 Volkswagen 135 Q2 2026 U.S. - 1 Toyota & 1 Honda 205 Dispositions/Terminations ($1,330) Q4 2025 U.S. - 1 Chrysler Jeep Dodge Ram (140) Q4 2025 U.K. - 1 Toyota, 2 BMW/MINI, and 1 Volkswagen (165) Q1 2026 U.K. - 1 Volkswagen and 1 Skoda (65) Q1 2026 U.S. - 2 Mercedes Benz in California (505) Q2 2026 U.K. - 5 Jaguar / Land Rover (355) Q3 2026 U.K. - 1 Volkswagen and 1 Audi (100) Q4 (Closed transactions through 10/28) Annualized Revenues ($m) Acquisitions US – 10 Hennessy: 2 Porsche, 2 Lexus, 3 Jaguar / Land Rover, 1 Honda, 1 Cadillac, 1 Ford / Lincoln 1,700 Q4 2026 Dispositions/Terminations Q4 2026 US – 1 Lexus, 1 Acura, 1 Honda (305) Quarterly Activity – Annualized Revenues ($m) 210 135 205 1,700 (305) (570) (355) (100) (305) Q3 '25 Q4 '25 Q1 '26 Q2 '26 Q3 '26 Q4 '26 Closed Transactions as of 10/28 Acquisitions Dispositions $405 Annualized Revenue Net Impact of Closed Transactions Q4 2025 – Q4 2026 to date (10/28) In addition, as of 10/28 the Company has definitive agreements to dispose of four U.S. dealerships, which generated approximately $235 million of annualized revenues.
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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, accelerated depreciation, out-of-period adjustments, legal matters, severance and restructuring charges, acquisition costs, non-cash gains and losses on interest rate swaps, gains and losses on dealership franchise or real estate transactions, and catastrophic events, such as hailstorms, hurricanes and snow storms. 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, adjusted operating margin, adjusted pretax margin, adjusted financeand insurance gross profit per retail unit 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 mayprovide 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 usesthese 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. TheSame 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. 28
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Certain numbers may not compute due to rounding Reconciliation: Adjusted Cash Flow (Non-GAAP) (Unaudited, $MM) 2019 2020 2021 2022 2023 2024 2025 3Q25 YTD 3Q26 YTD Operating Cash Flow (GAAP) $371 $805 $1,260 $586 $190 $586 $694 $565 $342 Change in Floorplan notes payable - credit facilities and other, excluding floorplan offset account and net acquisitions and dispositions (43) (314) (491) 320 505 133 7 (63) 3 Change in Floorplan notes payable – manufacturer affiliates associated with net acquisitions and dispositions and floorplan offset activity 4 12 (13) 10 25 (37) (2) (2) 6 Adjusted Operating Cash (Non- GAAP) 332 504 755 916 720 683 699 500 350 Cap Ex* (97) (71) (96) (116) (139) (179) (214) (150) (131) Adjusted Free Cash Flow (Non- GAAP) $235 $432 $659 $800 $581 $504 $485 $350 $219 29
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Reconciliation: Adjusted EBITDA (Non-GAAP) (Unaudited, $ in millions except percentages) Nine months ended September 30 Net income from continuing operations $335.7 Income tax expense 100.7 Depreciation and amortization expense 93.3 Non-floorplan interest expense 143.6 EBITDA from continuing operations $673.3 Adjustments: Catastrophic events 4.0 F&I cumulative catch-up 6.8 Restructuring charges 3.2 (Gain) loss on real estate and dealership transactions (38.2) Severance 2.7 Acquisition costs 7.4 Legal matters and other professional fees 3.1 Asset impairments 10.3 Adjusted EBITDA from continuing operations $672.6 Total revenues $16,188.8 F&I cumulative catch-up 6.8 Total adjusted revenues $16,195.6 Net income margin 2.1% EBITDA margin 4.2% Adjusted EBITDA margin 4.2% Certain numbers may not compute due to rounding 30
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Reconciliation: Adjusted Continuing Ops Earnings Per Share (Non-GAAP) (Unaudited) 3Q25 3Q26 As Reported EPS from Continuing Ops $1.02 $8.59 After Tax Adjustments: Catastrophic Events (0.01) 0.03 (Gain) loss on real estate and dealership transactions (0.04) (0.22) Restructuring charges 0.12 - Legal matters and other professional fees 0.35 0.07 Severance 0.02 - Acquisition costs 0.25 0.45 Asset impairment and accelerated depreciation 8.73 0.43 Adjusted Diluted EPS $10.45 $9.36 Certain numbers may not compute due to rounding 31
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Reconciliation: 3Q26 YTD Adjusted F&I (Non-GAAP) (Unaudited) U.S. Actual U.S. Same Store $MM F&I, net $532.4 $517.6 Non–recurring F&I adjustment 6.8 6.8 Adjusted F&I, net $539.2 $524.4 Per Retail Unit (PRU) F&I Gross PRU $2,437 $2,441 Non–recurring F&I adjustment PRU 31 32 Adjusted F&I Gross Profit PRU $2,468 $2,473 32
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Reconciliation: Adjusted Total Earnings Per Share (Non-GAAP) (Unaudited) 2019 2020 2021 2022 2023 2024 2025 As Reported EPS $9.34 $15.51 $30.11 $47.14 $42.73 $36.81 $25.24 After Tax Adjustments: Asset impairments and accelerated depreciation 0.94 1.69 0.07 0.10 1.82 2.26 13.53 (Gain) loss on real estate and dealership transactions (0.13) (0.23) (0.19) (1.86) (0.65) (2.94) (0.94) Loss on extinguishment of long-term debt - 0.58 - - - - - Catastrophic Events 0.72 - 0.12 - 0.18 0.53 0.07 Severance Costs - 0.10 - - - 0.05 0.13 Legal matters and other professional fees 0.05 (0.12) (0.23) 0.04 0.33 0.20 0.67 Acquisitions costs including related tax impact - - 0.57 0.12 0.05 1.46 0.39 Tax Rate Changes - - (0.10) - - - - Out-of-period adjustments - 0.53 - - - - - Non-cash (gain) loss on interest rate swaps - - 0.20 - (0.22) - - Restructuring Charges - - - - - 0.92 1.73 Discontinued operations: debt redemption & non-cash CTA losses - - 4.46 0.31 - - - Adjusted Diluted EPS $10.93 $18.06 $35.02 $45.85 $44.24 $39.29 $40.83 Certain numbers may not compute due to rounding 33