Exhibit 99.1

AMSC、2025年度第4四半期および通期の決算ならびに事業見通しを発表

Business Highlights:

• 通期の売上高は前年同期比34%増となり、過去最高の2億9,920万ドルを記録した

• 12か月分の受注残高は前年同期比で約40％増加し、約2億8,000万ドルとなった

当社は明日5月28日午前10時（米国東部時間）に電話会議を開催します

マサチューセッツ州エイヤー – 2026年5月27日 – ますます複雑化するエネルギーシステムを統合し、顧客が複雑さや規模を拡大することなく事業を拡張できるようにする電力制御ソリューションのリーディングプロバイダーであるAMSC（ナスダック：AMSC）は、本日、2026年3月31日に終了した第4四半期および通期（「2025年度」）の決算を発表しました。

2025年度第4四半期の売上高は8,640万ドルとなり、2024年度同期の6,670万ドルから増加しました。この前年同期比の増加は、当社のグリッド事業および風力発電事業における堅調な内生的成長に加え、Comtrafo社の買収による寄与によるものです。

AMSCの2025年度第4四半期の純利益は450万ドル（1株当たり0.10ドル）となり、2024年度同期の純利益120万ドル（1株当たり0.03ドル）と比較して増加しました。 2025年度第4四半期の当社の非GAAP純利益は1,410万ドル（1株当たり0.31ドル）であり、2024年度同期の非GAAP純利益480万ドル（1株当たり0.13ドル）と比較して増加しました。GAAPと非GAAPの業績の調整については、以下の財務表をご参照ください。

2025年度の売上高は2億9,920万ドルとなり、2024年度の2億2,280万ドルから増加しました。この前年比増加は、前年度を上回るグリッドおよび風力発電事業の売上高に加え、Comtrafoの買収による寄与によるものです。

AMSCは、2025年度の純利益が1億3,380万ドル（1株当たり3.12ドル）であったと報告した。これは、2024年度の純利益600万ドル（1株当たり0.16ドル）と比較して大幅な増加であり、主に繰延税金資産に対する評価引当金の大部分が解消されたことによる非現金性の税務上の利益が要因となっている。 2025年度の非GAAP基準による当期純利益は1億5,810万ドル（1株当たり3.68ドル）となり、2024年度の非GAAP基準による当期純利益2,400万ドル（1株当たり0.65ドル）から増加しました。GAAP基準と非GAAP基準の業績の調整については、以下の財務表をご参照ください。

2026年3月31日現在の現金、現金同等物および制限付き現金は、合計1億4,760万ドルであった。

「AMSCは、卓越した戦略的・業務的な実行力を反映し、四半期および通期で過去最高の業績を達成しました」と、AMSCの会長兼社長兼CEOであるダニエル・P・マクガーン氏は述べた。「第4四半期は堅調な業績となり、売上高は前年同期比30％増の8,600万ドル超となりました。 通年では、主に25％の有機的成長に牽引され、さらにラテンアメリカにおける公益事業および産業分野の需要を取り込むための最近の買収が後押しとなり、売上高は34％増の3億ドル近くに達しました。第4四半期の受注額は1億ドルに迫り、これは従来のエネルギー部門に加え、公益事業市場におけるデータセンター需要の急増が牽引しました。 通年では、売上高が34％増の3億ドル近くに達しました。これは主に25％の有機的成長によるものであり、ラテンアメリカにおける公益事業および産業分野の需要を取り込むための最近の買収も後押しとなりました。第4四半期の受注高は1億ドルに迫り、従来からのエネルギー部門に加え、公益事業市場におけるデータセンター需要の急増が牽引しました。当年度末時点で、12ヶ月間の受注残高は前年同期比で40％近く増加し、約2億8,000万ドルとなりました。これらの結果は、当社の対象市場の拡大と、規律ある事業運営の実行力を示しています。2026年度に入り、当社は「進歩を推進し、AMSCのお客様の長期的な成功を牽引する」ことに揺るぎない焦点を当てていきます。」

Business Outlook

2026年6月30日に終了する第1四半期について、AMSCは売上高が8,500万ドルを超えると見込んでいます。2026年度第1四半期の当社の純利益は、条件付対価の変動による影響を除き、300万ドル、すなわち1株当たり0.07ドルを超えると予想されます。 また、当社の非GAAP基準による純利益（以下に定義）は、800万ドル、すなわち1株当たり0.17ドルを超えると予想される。

Conference Call Reminder

本発表に伴い、AMSCの経営陣は、2026年5月28日（木）東部時間午前10時より、投資家向け電話会議に参加し、当社の決算および事業見通しについて説明します。電話会議のライブ配信またはアーカイブ配信を視聴される方は、当社ウェブサイト（https://ir.amsc.com）の「Investors（投資家向け情報）」セクションをご覧ください。 ライブ通話への参加は、1-844-481-2802 または 1-412-317-0675 に電話をかけ、「AMSCの電話会議に参加したい」とお伝えください。通話終了後2時間経過した時点で、1-855-669-9658 に電話をかけ、会議パスコード 1468055 を入力することで、通話録音の再生を聴くことができます。

About AMSC (Nasdaq: AMSC)

「未来の可能性」への信念を指針とするAMSCは、イノベーションと創造性を駆使して今日の課題に取り組み、より強靭で持続可能なエネルギーの未来を実現する、電力制御ソリューションのリーディングプロバイダーです。「進歩に力を与える」という目的のもと、当社は未来志向の技術を統合し、クリーンエネルギーに対する世界的な需要と、信頼性が高く効率的な電力供給とのバランスを図っています。 AMSCは、送電網の信頼性を最適化する先進的なグリッドシステムおよびエンジニアリングサービスを提供し、艦隊の効率性と安全性を高めるための船舶保護および電力管理ソリューションを提供するとともに、風力発電コストを削減する電子制御システムおよび設計を提供しています。これらのシステムに加え、当社は産業プロセスおよび制御、ならびに環境・排出ガス制御の分野における能力を提供し、エネルギーインフラ全体における運用効率を確保しています。 当社のソリューションは、電力ネットワークの最適化、海軍艦隊の安全性向上、そして世界中でギガワット規模の再生可能エネルギー供給を実現しています。1987年に設立されたAMSCは、マサチューセッツ州ボストン近郊に本社を置き、アジア、オーストラリア、ブラジル、ヨーロッパ、北米で事業を展開しています。詳細については、www.amsc.comをご覧ください。

© 2026 AMSC。AMSC、American Superconductor、Comtrafo、Neeltran、NEPSI および NWL は、American Superconductor Corporation の商標または登録商標です。その他のすべてのブランド名、製品名、商標、サービスマークは、それぞれの所有者に帰属します。

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. We intend such forward-looking statements to be covered by the safe harbor provision for forward-looking statements contained in Section 27A of the Securities Act of 1933 as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Any statements in this release regarding our goals and strategies; expanded addressable market and data center demand; order pipeline and backlog expectations; organic growth; acquisition integrations and benefits; business diversification, including through expanding end markets and entering new sectors; strengthening customer relationships; strong momentum; building a more resilient and profitable company; our expected GAAP and non-GAAP financial results for the quarter ending June 30, 2026; and other statements containing the words "believes," "anticipates," "plans," "expects," "will" and similar expressions, constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements represent management's current expectations and are inherently uncertain. There are a number of important factors that could materially impact the value of our common stock or cause actual results to differ materially from those indicated by such forward-looking statements. These important factors include, but are not limited to: If we fail to implement our business strategy successfully, our financial performance could be harmed; We may not realize all of the sales expected from our backlog of orders and contracts; We rely upon third-party suppliers for the components and subassemblies of many of our Grid and Wind products, making us vulnerable to supply shortages and price fluctuations, which could harm our business; We may acquire additional complementary businesses or technologies, which may require us to incur substantial costs for which we may never realize the anticipated benefits; Our business and operations may be materially adversely impacted in the event of a failure or security breach of our or any critical third parties’ IT Systems or Confidential Information; Our contracts with the U.S. and Canadian governments are subject to audit, modification or termination by such governments and include certain other provisions in favor of the governments. The continued funding of such contracts may remain subject to annual legislative appropriation, which, if not approved, could reduce our revenue and lower or eliminate our profit; Changes in U.S. government defense spending could negatively impact our financial position, results of operations, liquidity and overall business; Our performance on contracts with the U.S. Department of Defense may result in restrictions to our ability to repurchase our common stock or U.S. government denial of Foreign Military Sales or ceasing of assistance for international Direct Commercial Sales; Failure to comply with evolving data privacy and data protection laws, regulations, and other obligations, or to otherwise protect personal data, may adversely impact our business and financial results; Our success is dependent upon attracting and retaining qualified personnel and our inability to do so could significantly damage our business and prospects; A significant portion of our Wind segment revenues are derived from a single customer. If this customer’s business is negatively affected, it could adversely impact our business; Our success in addressing the wind energy market is dependent on the manufacturers that license our designs; Many of our revenue opportunities are dependent upon subcontractors and other business collaborators; Problems with product quality or product performance may cause us to incur warranty expenses or product liability charges and may damage our market reputation and prevent us from achieving increased sales and market share; Many of our customers outside of the United States may be either directly or indirectly related to governmental entities, and we could be adversely affected by violations of the United States Foreign Corrupt Practices Act and similar worldwide anti-bribery laws outside the United States; We have had limited success marketing and selling our superconductor products and system-level solutions, including our REG system, and our failure to more broadly market and sell our products and solutions could lower our revenue and cash flow; We or third parties on whom we depend may be adversely affected by natural disasters, including events resulting from climate change, and our business continuity and disaster recovery plans may not adequately protect us or our value chain from such events; Uncertainty surrounding our prospects and financial condition may have an adverse effect on our customer and supplier relationships; Pandemics, epidemics, or other public health crises may adversely impact our business, financial condition and results of operations; Changes in valuation allowance of deferred tax assets may affect our future operating results; If we fail to maintain proper and effective internal control over financial reporting on business acquisitions, our ability to produce accurate and timely financial statements could be impaired and may lead investors and other users to lose confidence in our financial data; We have not been historically profitable, and there can be no assurance that we will sustain our recent profitability; we have a history of negative operating cash flows, and we may require additional financing in the future, which may not be available to us; Changes in exchange rates could adversely affect our results of operations; We may be required to issue performance bonds, which restricts our ability to access any cash used as collateral for the bonds; Adverse changes in domestic and global economic conditions could adversely affect our operating results; The ongoing conflict between the United States, Israel, and Iran has disrupted global energy markets and supply chains and could adversely affect our business, financial condition, and results of operations; Our international operations are subject to risks that we do not face in the United States, which could have an adverse effect on our operating results; Our products face competition, which could limit our ability to acquire or retain customers; We have operations in, and depend on sales in, emerging markets, including Latin America and India, and global conditions could negatively affect our operating results or limit our ability to expand our operations outside of these markets. Changes in Brazil’s or India’s political, social, regulatory and economic environment may affect our financial performance; Industry consolidation could result in more powerful competitors and fewer customers; Evolving and varied expectations on environmental sustainability and social initiatives could adversely impact our business and financial results; Growth of the wind energy market depends largely on the availability and size of government subsidies, economic incentives and legislative programs designed to support the growth of wind energy; Lower prices for other energy sources may reduce the demand for wind energy development, which could have a material adverse effect on our ability to grow our Wind business; Our technology and products could infringe intellectual property rights of others, which may require costly litigation and, if we are not successful, could cause us to pay substantial damages and disrupt our business; We may be unable to adequately prevent disclosure of trade secrets and other proprietary information; Our patents may not provide meaningful or long-term protection for our technology, which could result in us losing some or all of our market position; Third parties have or may acquire patents that cover the materials, processes and technologies we use or may use in the future to manufacture our Amperium products, and our success depends on our ability to license such patents or other proprietary rights; There are a number of technological challenges that must be successfully addressed before our superconductor products can gain widespread commercial acceptance, and our inability to address such technological challenges could adversely affect our ability to acquire customers for our products; Our common stock has experienced, and may continue to experience, market price and volume fluctuations, which may prevent our stockholders from selling our common stock at a profit and could lead to costly litigation against us that could divert our management’s attention; Unfavorable results of legal proceedings could have a material adverse effect on our business, operating results and financial condition; and the other important factors discussed under the caption "Risk Factors" in Part 1. Item 1A of our Form 10-K for the fiscal year ended March 31, 2026, and our other reports filed with the SEC. These important factors, among others, could cause actual results to differ materially from those indicated by forward-looking statements made herein and presented elsewhere by management from time to time. Any such forward-looking statements represent management's estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

要約された連結損益計算書

(単位：千米ドル（1株当たりのデータを除く)

Carolyn Capaccio, CFA

Nicol Golez

Phone: (978) 399-8344

RooneyPartners

Joe Luongo