Exhibit 99.1

Constellium Reports Third Quarter 2022 Results

Paris, October 26, 2022 – Constellium SE (NYSE: CSTM) today reported results for the third quarter ended September 30, 2022.

Third quarter 2022 highlights:

Nine months ended September 30, 2022 highlights:

Jean-Marc Germain, Constellium’s Chief Executive Officer said, “Constellium delivered strong results in the third quarter. Adjusted EBITDA of €160 million is a third quarter record and includes record third quarter performances by both A&T and AS&I. Looking across our end markets, packaging demand continues to be resilient. Our shipments were down in the quarter due to operating challenges at our Muscle Shoals facility. Automotive shipments were up double digits in the quarter versus last year with new platform launches driving our growth, but we continue to be impacted by the semiconductor shortage and other supply chain challenges. In aerospace, demand is very strong with shipments up around 50% compared to last year for the second quarter in a row. While we are seeing signs of weakness across certain industrial markets, we like our end market positioning. Free Cash Flow in the third quarter was solid at €74 million.”

“Macroeconomic and geopolitical risks remain elevated and we expect significant inflationary pressures to continue, particularly for inputs like energy and in regions more directly affected by the ongoing war in Ukraine. The Constellium team has demonstrated its relentless focus on execution and cost control and I am confident in our ability to manage our business through these challenging times. We remain focused on executing our strategy, driving operational improvements, strengthening our margins, generating Free Cash Flow and increasing shareholder value,” Mr. Germain continued.

Mr. Germain concluded, “We expect recent demand trends in our markets to continue through the remainder of 2022. Based on our current outlook, in 2022 we expect Adjusted EBITDA at the low end of our range of €670 million to €690 million and Free Cash Flow in excess of €170 million.”

The difference between the sum of reported segment revenue and total group revenue includes revenue from certain non-core activities and inter-segment eliminations. The difference between the sum of reported segment Adjusted EBITDA and the Group Adjusted EBITDA is related to Holdings and Corporate.

For the third quarter of 2022, shipments of 387 thousand metric tons decreased 2% compared to the third quarter of last year due to lower shipments in the Packaging & Automotive Rolled Products segment, partially offset by higher shipments in the Aerospace & Transportation and Automotive Structures & Industry segments. Revenue of €2.0 billion increased 27% compared to the third quarter of the prior year primarily due to improved price and mix and higher metal prices. VAR of €673 million increased 21% compared to the third quarter of the prior year primarily due to improved price and mix and favorable foreign exchange translation, partially offset by lower volumes and unfavorable metal costs due to inflation. Net income of €131 million increased €32 million compared to net income of €99 million in the third quarter of 2021. Adjusted EBITDA of €160 million increased 12% compared to the third quarter of last year due to stronger results in our Aerospace & Transportation, Automotive Structures & Industry and Holdings & Corporate segments, partially offset by weaker results in our Packaging & Automotive Rolled Products segment.

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For the first nine months of 2022, shipments of 1.2 million metric tons increased 2% compared to the first nine months of 2021 on higher shipments in each of our segments. Revenue of €6.3 billion increased 41% compared to the first nine months of 2021 primarily due to higher metal prices, improved price and mix and higher volumes. VAR of €2.0 billion increased 21% compared to the first nine months of 2021 primarily due to higher volumes, improved price and mix and favorable foreign exchange translation, partially offset by unfavorable metal costs due to inflation. Net income of €278 million increased €23 million compared to net income of €255 million in the first nine months of 2021. Adjusted EBITDA of €525 million increased 21% compared to the first nine months of 2021 on stronger results in our Aerospace & Transportation, Automotive Structures & Industry and Holdings & Corporate segments.

For the third quarter of 2022, Adjusted EBITDA decreased 17% compared to the third quarter of 2021 as a result of lower shipments and higher operating costs mainly due to inflation and operating challenges at our Muscle Shoals facility which resulted in higher maintenance and supplies costs, partially offset by improved price and mix and favorable foreign exchange translation. Shipments of 267 thousand metric tons decreased 5% compared to the third quarter of the prior year due to lower shipments of packaging and specialty rolled products, partially offset by higher shipments of automotive rolled products. Revenue of €1.1 billion increased 15% compared to the third quarter of 2021 primarily due to improved price and mix and higher metal prices, partially offset by lower shipments.

For the first nine months of 2022, Adjusted EBITDA of €255 million was relatively stable compared to the first nine months of 2021 with improved price and mix, favorable metal costs and favorable foreign exchange translation offset by higher operating costs mainly due to inflation and operating challenges at our Muscle Shoals facility which resulted in higher maintenance and supplies costs. Shipments of 835 thousand metric tons were stable compared to the first nine months of 2021 on higher shipments of automotive rolled products, mostly offset by lower shipments of specialty rolled products. Revenue of €3.7 billion increased 37% compared to the first nine months of 2021 primarily due to higher metal prices.

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For the third quarter of 2022, Adjusted EBITDA increased 136% compared to the third quarter of 2021 primarily due to higher shipments, improved price and mix and favorable foreign exchange translation, partially offset by higher operating costs due to inflation and the production ramp-up in aerospace. Shipments of 55 thousand metric tons increased 6% compared to the third quarter of 2021 on higher shipments of aerospace rolled products, partially offset by lower shipments of TID rolled products. Revenue of €432 million increased 50% compared to the third quarter of 2021 on improved price and mix, higher metal prices, higher shipments and favorable foreign exchange translation.

For the first nine months of 2022, Adjusted EBITDA of €161 million increased 99% compared to the first nine months of 2021 primarily due to higher shipments, improved price and mix and favorable foreign exchange translation, partially offset by higher operating costs due to inflation and the production ramp-up in aerospace. Shipments of 170 thousand metric tons increased 11% compared to the first nine months of 2021 on higher shipments of aerospace rolled products. Revenue of €1.3 billion increased 56% compared to the first nine months of 2021 primarily due to higher metal prices, improved price and mix and higher shipments.

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For the third quarter of 2022, Adjusted EBITDA increased 7% compared to the third quarter of 2021 primarily due to higher shipments and improved price and mix, partially offset by higher operating costs mainly due to inflation. Shipments of 65 thousand metric tons increased 4% compared to the third quarter of 2021 due to higher shipments of automotive extruded products. Revenue of €473 million increased 45% compared to the third quarter of 2021 primarily due to improved price and mix and higher metal prices.

For the first nine months of 2022, Adjusted EBITDA of €118 million increased 6% compared to the first nine months of 2021 primarily due to higher shipments and improved price and mix, partially offset by higher operating costs mainly due to inflation. Shipments of 207 thousand metric tons increased 3% compared to the first nine months of 2021 on higher shipments of other extruded products. Revenue of €1.4 billion increased 40% compared to the first nine months of 2021 primarily due to higher metal prices and improved price and mix.

For the third quarter of 2022, net income of €131 million compares to net income of €99 million in the third quarter of the prior year. The increase in net income is primarily related to the recognition of deferred tax assets previously unrecognized, partially offset by realized losses on derivatives mostly related to our metal hedging positions and lower gross profit.

For the first nine months of 2022, net income of €278 million compares to net income of €255 million in first nine months of the prior year. The increase in net income is primarily related to the recognition of deferred tax assets previously unrecognized, higher gross profit and lower finance costs, partially offset by realized and unrealized losses on derivatives mostly related to our metal hedging positions and higher selling and administrative expenses.

Free Cash Flow was €160 million in the first nine months of 2022 compared to €121 million in the first nine months of the prior year. The increase was primarily due to stronger Adjusted EBITDA and lower cash interest, partially offset by increased capital expenditures and higher cash taxes.

Cash flows from operating activities were €323 million for the first nine months of 2022 compared to cash flows from operating activities of €239 million in the first nine months of the prior year. Constellium increased derecognized factored receivables by €22 million for the first nine months of 2022 compared to a decrease of €30 million in the prior year.

Cash flows used in investing activities were €163 million for the first nine months of 2022 compared to cash flows used in investing activities of €118 million in the first nine months of the prior year.

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Cash flows used in financing activities were €141 million for the first nine months of 2022 compared to cash flows used in financing activities of €241 million in the first nine months of the prior year. In the first nine months of 2022, Constellium drew on the Pan-U.S. ABL due 2026 and used the proceeds and cash on the balance sheet to repay the €180 million PGE French Facility due 2022 and the CHF 15 million Swiss Facility due 2025. In the first nine months of 2021, Constellium issued $500 million of 3.75% Sustainability-Linked Senior Notes due 2029 and €300 million of 3.125% Sustainability-Linked Senior Notes due 2029 and used the proceeds and cash on the balance sheet to redeem $650 million of 6.625% Senior Notes due 2025 and $400 million of 5.75% Senior Notes due 2024.

Liquidity at September 30, 2022 was €819 million, comprised of €171 million of cash and cash equivalents and €648 million available under our committed lending facilities and factoring arrangements.

Net debt was €1,997 million at September 30, 2022 compared to €1,981 million at December 31, 2021.

Based on our current outlook, we expect Adjusted EBITDA in the range of €670 million to €690 million in 2022.

We are not able to provide a reconciliation of this 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, metal lag, impairment or restructuring charges, or taxes without unreasonable efforts, and these items could significantly impact, either individually or in the aggregate, net income in the future.

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Certain statements contained in this press release may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This press release 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; disruption to business operations, including the length and magnitude of disruption resulting from the global COVID-19 pandemic; the Russian invasion of Ukraine; 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 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.

Constellium (NYSE: CSTM) is a global sector leader that develops innovative, value added aluminium products for a broad scope of markets and applications, including packaging, automotive and aerospace. Constellium generated €6.2 billion of revenue in 2021.

Constellium’s earnings materials for the third quarter ended September 30, 2022, are also available on the company’s website (www.constellium.com).

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CONSOLIDATED INCOME STATEMENT (UNAUDITED)

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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME / (LOSS) (UNAUDITED)

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CONSOLIDATED STATEMENT OF FINANCIAL POSITION (UNAUDITED)

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED)

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CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED)

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SEGMENT ADJUSTED EBITDA

SHIPMENTS AND REVENUE BY PRODUCT LINE

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NON-GAAP MEASURES

Reconciliation of Revenue to VAR (a non-GAAP measure)

Reconciliation of net income to Adjusted EBITDA (a non-GAAP measure)

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Reconciliation of net cash flows from operating activities to Free Cash Flow (a non-GAAP measure)

Reconciliation of borrowings to Net debt (a non-GAAP measure)

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Non-GAAP measures

In addition to the results reported in accordance with International Financial Reporting Standards

(“IFRS”), this press release includes information regarding certain financial measures which are not prepared in accordance with IFRS (“non-GAAP measures”). The non-GAAP measures used in this press release are: VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. Reconciliations to the most directly comparable IFRS financial measures are presented in the schedules to this press release. We believe these non-GAAP measures are important supplemental measures of our operating and financial performance. By providing these measures, together with the reconciliations, we believe we are enhancing investors’ understanding of our business, our results of operations and our financial position, as well as assisting investors in evaluating the extent to which we are executing our strategic initiatives. However, these non-GAAP financial measures supplement our IFRS disclosures and should not be considered an alternative to the IFRS measures and may not be comparable to similarly titled measures of other companies.

VAR is defined as revenue, excluding revenue from incidental activities, minus cost of metal which includes, cost of aluminium adjusted for metal lag, cost of other alloying metals, freight out costs, and realized gains and losses from hedging. Management believes that VAR is a useful measure of our activity as it eliminates the impact of metal costs from our revenue and reflects the value-added elements of our activity. VAR eliminates the impact of metal price fluctuations which are not under our control and which we generally pass-through to our customers and facilitates comparisons from period to period. VAR is not a presentation made in accordance with IFRS and should not be considered as an alternative to revenue determined in accordance with IFRS.

In considering the financial performance of the business, management and our chief operational decision maker, as defined by IFRS, analyze the primary financial performance measure of Adjusted EBITDA in all of our business segments. The most directly comparable IFRS measure to Adjusted EBITDA is our net income or loss for the period. We believe Adjusted EBITDA, as defined below, is useful to investors and is used by our management for measuring profitability because it excludes the impact of certain non-cash charges, such as depreciation, amortization, impairment and unrealized gains and losses on derivatives as well as items that do not impact the day-to-day operations and that management in many cases does not directly control or influence. Therefore, such adjustments eliminate items which have less bearing on our core operating performance.

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.

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Adjusted EBITDA is defined as income / (loss) from continuing operations before income taxes, results from joint ventures, net finance costs, other expenses and depreciation and amortization as adjusted to exclude restructuring costs, impairment charges, unrealized gains or losses on derivatives and on foreign exchange differences on transactions which do not qualify for hedge accounting, metal price lag, share based compensation expense, effects of certain purchase accounting adjustments, start-up and development costs or acquisition, integration and separation costs, certain incremental costs and other exceptional, unusual or generally non-recurring items.

Adjusted EBITDA is the measure of performance used by management in evaluating our operating performance, in preparing internal forecasts and budgets necessary for managing our business and, specifically in relation to the exclusion of the effect of favorable or unfavorable metal price lag, this measure allows management and the investor to assess operating results and trends without the impact of our accounting for inventories. We use the weighted average cost method in accordance with IFRS which leads to the purchase price paid for metal impacting our cost of goods sold and therefore profitability in the period subsequent to when the related sales price impacts our revenues. Management believes this measure also provides additional information used by our lending facilities providers with respect to the ongoing performance of our underlying business activities. Historically, we have used Adjusted EBITDA in calculating our compliance with financial covenants under certain of our loan facilities.

Adjusted EBITDA is not a presentation made in accordance with IFRS, is not a measure of financial condition, liquidity or profitability and should not be considered as an alternative to profit or loss for the period, revenues or operating cash flows determined in accordance with IFRS.

Free Cash Flow is defined as net cash flow from operating activities less capital expenditure, equity contributions and loans to joint ventures and other investing activities. Management believes that Free Cash Flow is a useful measure of the net cash flow generated or used by the business as it takes into account both the cash generated or consumed by operating activities, including working capital, and the capital expenditure requirements of the business. However, Free Cash Flow is not a presentation made in accordance with IFRS and should not be considered as an alternative to operating cash flows determined in accordance with IFRS. Free Cash Flow has certain inherent limitations, including the fact that it does not represent residual cash flows available for discretionary spending, notably because it does not reflect principal repayments required in connection with our debt or capital lease obligations.

Net debt is defined as borrowings plus or minus the fair value of cross currency basis swaps net of margin calls less cash and cash equivalents and cash pledged for the issuance of guarantees. Management believes that Net debt is a useful measure of indebtedness because it takes into account the cash and cash equivalent balances held by the Company as well as the total external debt of the Company. Net debt is not a presentation made in accordance with IFRS, and should not be considered as an alternative to borrowings determined in accordance with IFRS.

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