Fourth Quarter and Full Year 2024 Earnings Call February 20, 2025

Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our expectations or beliefs concerning future events and conditions. You can identify forward-looking statements because they contain words such as, but not limited to, “believes,” “expects,” “may,” “should,” “approximately,” “anticipates,” “estimates,” “intends,” “plans,” “targets,” likely,” “will,” “would,” “could” and similar expressions (or the negative of these terminologies or expressions). All forward-looking statements involve risks and uncertainties. Many risks and uncertainties are inherent in our industry and markets, while others are more specific to our business and operations. These risks and uncertainties include, but are not limited to: market competition; economic downturn or industry specific conditions including the impacts of tax and tariff programs, inflation, foreign currency exchange, and industry consolidation; disruption to business operations; natural disasters including severe flooding and other weather-related events; the conflict between Russia and Ukraine and other geopolitical tensions; the inability to meet customer demand and quality requirements; the loss of key customers, suppliers or other business relationships; supply disruptions; excessive inflation; the capacity and effectiveness of our hedging policy activities; the loss of key employees; levels of indebtedness which could limit our operating flexibility and opportunities; and other risk factors set forth under the heading “Risk Factors” in our Annual Report on Form 20-F (and in future filings under Form 10-K), and as described from time to time in subsequent reports filed with the U.S. Securities and Exchange Commission. The occurrence of the events described and the achievement of the expected results depend on many events, some or all of which are not predictable or within our control. Consequently, actual results may differ materially from the forward-looking statements contained in this press release. We undertake no obligation to update or revise any forward-looking statement as a result of new information, future events or otherwise, except as required by law. Fourth Quarter 2024 - Earnings Call - 2

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Free Cash Flow, Adjusted NOPAT, Invested Capital, Adjusted ROIC and Net debt. These measures are presented because management uses this information to monitor and evaluate financial results and trends and believes this information to also be useful for investors. Adjusted EBITDA measures are frequently used by securities analysts, investors and other interested parties in their evaluation of Constellium and in comparison to other companies, many of which present an adjusted EBITDA-related performance measure when reporting their results. Adjusted EBITDA, Free Cash Flow, Adjusted NOPAT, Invested Capital, Adjusted ROIC and Net debt are not presentations made in accordance with U.S. GAAP and may not be comparable to similarly titled measures of other companies. These non-GAAP financial measures supplement our GAAP disclosures and should not be considered an alternative to the GAAP measures. This presentation provides a reconciliation of non-GAAP financial measures to the most directly comparable GAAP financial measures. We are not able to provide a reconciliation of Adjusted EBITDA guidance to net income, the comparable GAAP measure, because certain items that are excluded from Adjusted EBITDA cannot be reasonably predicted or are not in our control. In particular, we are unable to forecast the timing or magnitude of realized and unrealized gains and losses on derivative instruments, non-cash impact of metal price lag, impairment or restructuring charges, or taxes without unreasonable efforts, and these items could significantly impact, either individually or in the aggregate, our net income in the future. Fourth Quarter 2024 - Earnings Call - 3

Jean-Marc Germain Chief Executive Officer

Safety is Our Top Priority Our Decin and Changchun operations both completed 2 million working hours without a recordable case in 2024 Valais A&T completed 1 million working hours without a recordable case in 2024 13 sites finished 2024 with zero recordable cases 4 sites completed multi-year stretches without a recordable case in 2024 (1) Recordable case rate measures the number of fatalities, serious injuries, lost-time injuries, restricted work injuries, or medical treatments per one million hours worked. Delivered best-in-class safety performance in 2024 with a recordable case rate of 2.02; focus on safety is never ending, targeting 1.5 recordable case rate in 2025 Fourth Quarter 2024 - Earnings Call - 5 Recordable Case Rate(1)

Q4 2024 Highlights Shipments: 328 thousand tons (-2% YoY) Revenue: $1.7 billion (-1% YoY) Net loss: $(47) million Adjusted EBITDA: $125 million Includes negative $15 million impact at Valais as a result of the flood Includes positive non-cash metal price lag impact of $27 million Cash from Operations: $61 million Free Cash Flow: $(85) million Includes negative $39 million impact at Valais as a result of the flood Excludes $21 million of cash received for collection of deferred purchase price receivables, as a result of IFRS to U.S. GAAP conversion Shareholder Returns: repurchased ~1.6 million shares of the Company stock for $18.5 million Note: Segment Adjusted EBITDA excludes the non-cash impact of metal price lag. Amounts may not sum due to rounding. Challenging Q4 as expected with continued weakness in several end markets, tight scrap spreads in North America and the financial impact at Valais as a result of the flood Fourth Quarter 2024 - Earnings Call - 6 Adjusted EBITDA Bridge in $ millions

FY 2024 Highlights Shipments: 1.4 million tons (-4% YoY) Revenue: $7.3 billion (-6% YoY) Net income: $60 million Adjusted EBITDA: $623 million Includes negative $33 million impact at Valais as a result of the flood Includes positive non-cash metal price lag impact of $55 million Cash from Operations: $301 million Free Cash Flow: $(100) million Includes negative $45 million impact at Valais as a result of the flood Excludes $85 million of cash received for collection of deferred purchase price receivables, as a result of IFRS to U.S. GAAP conversion Shareholder Returns: repurchased ~4.6 million shares of the Company stock for $79 million Adjusted ROIC: 5.5% (down 500 bps YoY) Leverage: 3.1x at December 31, 2024 (2.9x excluding Valais flood impact) Note: Segment Adjusted EBITDA excludes the non-cash impact of metal price lag. Amounts may not sum due to rounding. 2024 was a very challenging year due to market-driven headwinds and weather-related impacts Fourth Quarter 2024 - Earnings Call - 7 Adjusted EBITDA Bridge in $ millions

Current Assessment of Section 232 Tariffs and Potential Impact on Constellium Fourth Quarter 2024 - Earnings Call - 8 Tariffs remain a very fluid situation; we are continually monitoring and assessing the potential impact of current and future trade policies; at this stage we believe it presents opportunities for Constellium Production Metal Supply Commercial End Market Primary Import some primary aluminum (P1020, sheet ingots) from Canada given the lack of smelter capacity in the U.S. (will become more expensive) Commercial negotiations necessary to mitigate tariffs; may be a lag in passing additional costs through Scrap Aluminum scrap is excluded from the current scope of Section 232 Purchase most of our scrap needs from dealers in the U.S. Rise in U.S. regional premium could attract more scrap into the U.S., hence increasing domestic availability (positive impact) Mostly “local for local” One JV (Astrex) in Canada providing extrusions to our Automotive Structures business in the U.S. (will become more expensive) Small quantities of Aerospace shipments from Europe to the U.S. serving global OEMs (this is a pass-through today) Supports market pricing domestically and makes imports less competitive in the U.S. (positive impact) Price increase announced on February 18th, 2025 We have some quarterly priced U.S. business that will benefit from new market dynamics Too early to estimate (unknown impact) Depends on the health of the U.S. domestic economy and types of tariffs to be implemented in the future

Jack Guo Chief Financial Officer

Q4 2024 Q4 2023 % △ Shipments (kt) 44 48 (7)% Revenue ($m) 430 439 (2)% Segment Adj. EBITDA ($m) 56 83 (33)% Segment Adj. EBITDA ($ / t) 1,271 1,747 (27)% Aerospace & Transportation Q4 2024 Segment Adjusted EBITDA Bridge Q4 2024 Performance Fourth Quarter 2024 - Earnings Call - 10 (1) (1) Financial impact at Valais as a result of the flood. Insurance proceeds accounted for below Adjusted EBITDA. Segment Adjusted EBITDA of $56 million Stable aerospace shipments Lower TID shipments Unfavorable price and mix Unfavorable impact of Valais flood(1) FY 2024 Segment Adjusted EBITDA Bridge (1)

Q4 2024 Q4 2023 % △ Shipments (kt) 239 238 —% Revenue ($m) 1,009 930 8% Segment Adj. EBITDA ($m) 56 85 (34)% Segment Adj. EBITDA ($ / t) 234 357 (34)% Packaging & Automotive Rolled Products Q4 2024 Segment Adjusted EBITDA Bridge Q4 2024 Performance Fourth Quarter 2024 - Earnings Call - 11 FY 2024 Segment Adjusted EBITDA Bridge Segment Adjusted EBITDA of $56 million Higher packaging shipments; lower automotive shipments Unfavorable price and mix Unfavorable metal costs given tighter scrap spreads in N.A. Lower operating costs Q4 2023 benefited from higher energy-related grants

Q4 2024 Q4 2023 % △ Shipments (kt) 44 50 (13)% Revenue ($m) 329 358 (8)% Segment Adj. EBITDA ($m) 4 23 (83)% Segment Adj. EBITDA ($ / t) 91 458 (80)% Automotive Structures & Industry Q4 2024 Segment Adjusted EBITDA Bridge Q4 2024 Performance Fourth Quarter 2024 - Earnings Call - 12 (1) (1) Financial impact at Valais as a result of the flood. Insurance proceeds accounted for below Adjusted EBITDA. FY 2024 Segment Adjusted EBITDA Bridge (1) Segment Adjusted EBITDA of $4 million Lower automotive and industry shipments Favorable price and mix Higher costs Unfavorable impact of Valais flood(1)

Free Cash Flow of $(100) million(1); compared to 2023: Includes $45 million impact at Valais as a result of the flood Lower Segment Adjusted EBITDA Higher capital expenditures Lower working capital Excluding Valais flood impact and including collection of deferred purchase price receivables, 2024 Free Cash Flow of $30 million Repurchased ~4.6 million shares for $79 million in $ millions FY 2024 FY 2023 Net cash flows from operating activities 301 432 Purchases of property, plant and equipment net of property, plant and equipment inflows (401) (365) Free Cash Flow (100) 67 Collection of deferred purchase price receivables 85 97 Track Record of Free Cash Flow(1) Generation in $ millions 2024 Free Cash Flow(1) Highlights Current 2025 Expectations Fourth Quarter 2024- Earnings Call - 13 (1) Excludes $85 million, $97 million, and $90 million of cash received for collection of deferred purchase price receivables for the 2024, 2023 and 2022 periods, respectively, as a result of IFRS to U.S. GAAP conversion. >120 Free Cash Flow: >$120 million Capex: ~$330 million Cash interest: ~$120 million Cash taxes: ~$40 million TWC/Other: modest source of cash Free Cash Flow

Leverage of 3.1x at year-end, or 2.9x excluding Valais flood impact Target leverage range of 1.5x to 2.5x No bond maturities until 2028 Strong liquidity position Debt / Liquidity Highlights Net Debt and Liquidity Maturity Profile(1) in $ millions Liquidity in $ millions Net Debt and Leverage in $ millions Strong balance sheet and improved financial flexibility give us confidence to manage varying business conditions Leverage = Net Debt / LTM Segment Adjusted EBITDA, which excludes non-cash impact of metal price lag (1) See Borrowings Table in the Appendix for more details Fourth Quarter 2024- Earnings Call - 14

Jean-Marc Germain Chief Executive Officer

End Market Outlook Fourth Quarter 2024- Earnings Call - 16 Sources: CRU International, Aluminum Rolled Products Market Outlook November 2024. Aerospace 15% of 2024 revenues Packaging 39% of 2024 revenues Automotive 29% of 2024 revenues Other Specialties 17% of 2024 revenues Current Market Trends: Demand in North America has softened Demand remains weak in Europe Current Market Trends: Demand has stabilized at low levels in North America Demand remains weak in Europe Current Market Trends: Demand remains healthy in both North America and Europe Current Market Trends: Demand has stabilized in aviation and space; military aircraft remains healthy OEMs continue to deal with supply chain challenges SECULAR GROWTH Fuel economy Lightweighting Reduced emissions Electric vehicles Safety DIVERSIFIED CYCLES Diversified end markets with separate cycles Lightweighting in Transportation SECULAR GROWTH Sustainability Recyclability Can makers adding capacity to meet long-term demand LT SECULAR GROWTH Fuel economy Lightweighting Long-term market trends expected to remain intact CAGR (2024-2029): demand for aluminum canstock market North America: 3.4% Europe: 4.1% CAGR (2024-2029): demand for aerospace aluminum rolled product market North America + Europe: 8.1% Est. New Commercial Aircraft >42K between 2024 and 2043 CAGR (2024-2029): consumption of aluminum auto body sheet North America: 6.1% Europe: 8.4% Growth is expected to be in-line with or above gross domestic product (GDP)

Confident in Our Adjusted EBITDA(1) Target of $900 million in 2028 Fourth Quarter 2024 - Earnings Call - 17 (1) Excludes the non-cash impact of metal price lag. Assumes no impact from tariffs and that the macroeconomic and geopolitical environment remains generally stable. Growth assumptions generally below industry estimates Valais flood recovery Muscle Shoals operational improvement Neuf-Brisach recycling investment New Airware casthouse Muscle Shoals & Ravenswood casthouse investments EV battery foil investment Others Price discipline Productivity gains Cost reduction initiatives Inflation Tighter North American scrap spreads Unfavorable FX $568M $900M

Very challenging environment in 2024 Results impacted by market-driven headwinds (demand weakness across most end markets and tight scrap spreads in North America) and weather-related events (cold weather and snow in Muscle Shoals in January and severe flooding event in Valais in June) Started up new recycling center in Neuf-Brisach, France in September, slightly ahead of schedule and below budget Returned $79 million to shareholders through the repurchase of ~4.6 million shares during the year Shifted our reporting to U.S. dollars under U.S. GAAP, and will begin filing our SEC reports on U.S. domestic issuer forms, including our upcoming annual report on Form 10-K Exciting future ahead with opportunities to grow our business and enhance profitability and returns Portfolio serving diversified and generally resilient end markets Durable, sustainability-driven secular growth trends driving increased demand for our products Infinitely recyclable aluminum is part of the circular economy Previously-indicated Adjusted EBITDA drivers within our control; market recoveries provide additional upside Substantial value creation opportunities remain longer term, planting the seeds today for future growth and profitability Execution focused with proven ability to flex costs Strong balance sheet and Free Cash Flow generation allow financial flexibility and balanced capital allocations Approximately $221 million remaining on existing share repurchase program(2)(3) Key Messages and Guidance Focused on executing our strategy and increasing shareholder value Targets Note: Our guidance does not include any impact from potential tariffs. (1) Excludes the non-cash impact of metal price lag. (2) Full execution of share repurchase program will require shareholder approval annually at the Annual General Meeting. (3) Expires December 31, 2026. Fourth Quarter 2024 - Earnings Call - 18 2025 Adjusted EBITDA(1) $600 million to $630 million ——— 2025 Free Cash Flow >$120 million ——— 2028 Adjusted EBITDA(1) $900 million ——— 2028 Free Cash Flow $300 million ——— Leverage 1.5x - 2.5x

Appendix

Update on Flooding Situation in the Valais Fourth Quarter 2024 - Earnings Call - 20 Financial Impact at Valais as a Result of the Flood In late June 2024, Constellium’s plate and extrusion shops in Sierre, as well as the casthouse in Chippis, were severely flooded As of today, the business is on track to complete production ramp up by the end of the first quarter of 2025 As mentioned last quarter, we expect some cost impact in 2025 as production will continue to ramp up; also expect to receive a portion of the insurance proceeds in 2025 All insurance proceeds received in 2024 and 2025 accounted for below Adjusted EBITDA Included in our guidance for 2025 Q4 2024 Adjusted EBITDA: $15 million Free Cash Flow: $39 million ——— FY 2024 Adjusted EBITDA: $33 million Free Cash Flow: $45 million

Reconciliation of Net Income to Adjusted EBITDA ≥130 Three months ended December 31, For years ended December 31, (in millions of U.S. dollar) 2024 2023 2024 2023 Net (loss) / income (47) 5 60 157 Income tax expense 29 42 75 75 (Loss) / income before tax (18) 47 135 232 Finance costs - net 28 26 111 111 Expenses on factoring arrangements 6 7 22 24 Depreciation and amortization 77 71 304 300 Impairment of assets 11 7 24 22 Restructuring costs 4 — 11 — Unrealized losses / (gains) on derivatives 20 (2) 1 3 Unrealized exchange losses / (gains) from the remeasurement of monetary assets and liabilities – net — 2 (1) 2 Pension and other post-employment benefits - non operating gains (1) (3) (11) (14) Share based compensation costs 6 6 25 22 Losses / (gains) on disposal 1 2 4 (41) Other (9) 1 (2) 1 Adjusted EBITDA 125 164 623 662 of which Metal price lag (1) 27 (14) 55 (92) Fourth Quarter 2024 - Earnings Call - 21 (1) Excluded in Segment Adjusted EBITDA

Three months ended December 31, (in millions of U.S. dollar) 2024 2023 Net cash flows from operating activities 61 173 Purchases of property, plant and equipment net of property, plant and equipment inflows (146) (137) Free Cash Flow (85) 36 Collection of deferred purchase price receivables 21 22 (in millions of U.S. dollar) 2024 2023 2022 Net cash flows from operating activities 301 432 365 Purchases of property, plant and equipment net of property, plant and equipment inflows (401) (365) (284) Free Cash Flow (100) 67 81 Collection of deferred purchase price receivables 85 97 90 Fourth Quarter 2024 - Earnings Call - 22 Free Cash Flow Reconciliation

Net Debt Reconciliation ≥130 (in millions of U.S. dollar) December 31, 2024 September 30, 2024 June 30, 2024 March 31, 2024 December 31, 2023 Borrowings 1,918 1,914 1,898 1,906 1,929 Fair value of net debt derivatives, net of margin calls (1) 1 — 1 (2) Cash and cash equivalents (141) (170) (228) (195) (223) Net Debt 1,776 1,745 1,670 1,712 1,704 LTM Segment Adjusted EBITDA(1) 568 648 702 741 754 Leverage 3.1x 2.7x 2.4x 2.3x 2.3x (1) Segment Adjusted EBITDA excludes non-cash metal price lag Fourth Quarter 2024 - Earnings Call - 23

Reconciliation of LTM Segment Adjusted EBITDA to Net Income ≥130 Twelve months ended (in millions of U.S. dollar) December 31, 2024 September 30, 2024 June 30, 2024 March 31, 2024 December 31, 2023 P&ARP 242 271 278 296 305 A&T 285 312 345 359 351 AS&I 74 93 110 119 129 H&C (33) (29) (32) (33) (31) Segment Adjusted EBITDA 568 648 702 741 754 Metal price lag 55 14 (12) (89) (92) Adjusted EBITDA 623 662 689 653 662 Depreciation and amortization (304) (299) (302) (301) (300) Impairment of assets (24) (21) (22) (22) (22) Share based compensation costs (25) (25) (24) (25) (22) Pension and other post-employment benefits - non service costs 11 13 13 14 14 Restructuring costs (11) (7) (3) (1) — Unrealized (losses) / gains on derivatives (1) 21 28 2 (3) Unrealized exchange gains from the remeasurement of monetary assets and liabilities – net 1 (1) — (1) (2) Gains / (losses) on disposal (4) (3) 44 44 42 Other 2 (10) (9) (1) (1) Expenses on factoring arrangements (22) (23) (23) (23) (24) Other adjustments (377) (355) (298) (314) (318) Finance costs - net (111) (109) (107) (111) (111) Income before tax 135 200 286 229 232 Income tax (expense) / benefit (76) (88) (94) (75) (75) Net income 60 112 192 154 157 (1) Segment Adjusted EBITDA excludes non-cash metal price lag Fourth Quarter 2024 - Earnings Call - 24

Reconciliation of Net Income to Adjusted NOPAT and Adjusted ROIC ≥130 Fourth Quarter 2024 - Earnings Call - 25 Year ended December 31, (in millions of U.S. dollar) 2024 2023 Net income 60 157 Income tax expense 75 75 Income before tax 135 232 Finance costs - net 111 111 Expenses on factoring arrangements 22 24 Unrealized losses on derivatives 1 3 Unrealized exchange (gains) / losses from the remeasurement of monetary assets and liabilities - net (1) 2 Share based compensation costs 25 22 Metal price lag (55) 92 Losses / (gains) on disposals 4 (41) Other (2) 1 Tax impact(1) (64) (112) Adjusted NOPAT (A) 176 334 (in millions of U.S. dollar) 2023 2022 Intangible assets 104 115 Property, plant and equipment, net 2,422 2,334 Trade receivables and other, net - current 531 562 Derecognized trade receivables(2) 402 401 Inventories 1,197 1,382 Trade payables and other - current (1,411) (1,580) Provisions - current (21) (23) Income tax payable (22) (18) Total Invested Capital (B) 3,202 3,173 2024 2023 Adjusted NOPAT for fiscal year (A) 176 334 Total invested capital as of December 31 of prior year (B) 3,202 3,173 Adjusted ROIC (A)/(B) 5.5 % 10.5 % (1) Tax impact on net operating profit computed using the Group's average statutory tax rate (2) Trade receivables derecognized under our factoring agreements

Borrowings Table ≥130 Fourth Quarter 2024 - Earnings Call - 26 At December 31, 2024 2023 (in millions of U.S. dollar) Nominal Value in Currency Nominal rate Effective rate Face Value Debt issuance costs Accrued interest Carrying value Carrying value Secured Pan-U.S. ABL (due 2029) $ 55 Floating 6.53 % 55 — 1 56 — Senior Unsecured Notes Issued November 2017 and due 2026 (B) $ 250 5.875 % 6.26 % — — — — 254 Issued November 2017 and due 2026 (B) € 400 4.250 % 4.57 % — — — — 447 Issued June 2020 and due 2028 $ 325 5.625 % 6.05 % 325 (3) 1 323 322 Issued February 2021 and due 2029 $ 500 3.750 % 4.05 % 500 (4) 4 500 499 Issued June 2021 and due 2029 € 300 3.125 % 3.41 % 312 (3) 4 313 332 Issued August 2024 and due 2032 (C) € 350 6.375 % 6.77 % 350 (6) 9 353 — Issued August 2024 and due 2032 (C) $ 300 5.375 % 5.73 % 312 (5) 6 313 — Finance lease liabilities 30 — — 30 34 Other loans 30 — — 30 41 Total debt 1,914 (21) 25 1,918 1,929 Of which non-current 1,879 1,888 Of which current 39 41