DENVER, CO—March 19, 2026 – York Space Systems Inc. (NYSE: YSS) (York) today announced financial results for the fourth quarter and full year ended December 31, 2025.

* See definition and reconciliation of Adjusted EBITDA to net loss under “Non-GAAP Financial Measures” and “Reconciliation of GAAP to Non-GAAP Measures.”

“2025 was the year York defined what a modern mission prime looks like,” said CEO Dirk Wallinger. “We emerged as a leading provider to the Department of Defense’s Proliferated Warfighter Space Architecture, measured by spacecraft on orbit, number of contracts, and mission types. We delivered the first Tranche 1 Transport Layer satellites in-orbit, accelerated and executed the Dragoon mission in response to an identified agency need, and demonstrated in-plane and cross-vendor optical communications. We remain the only provider to demonstrate Link 16 from space and validated NASA’s shift to commercially procured communications through the BARD mission. We didn’t just win contracts, we delivered real capability on accelerated timelines, at scale, and at approximately half the cost of our competitors.”

“Our strong execution drove revenue up 52% year-on-year,” said CFO Kevin Messerle. “We continue to drive margins upwards and expect to deliver positive adjusted EBITDA in 2026. With a strong balance sheet further bolstered by our recent IPO, we believe we are well-positioned to scale as demand for our products and services continues to grow.”

Revenue increased $133 million, or 52%, to $386 million. This increase was primarily driven by increased completion against two of our Transport Layer Tranche 2 contracts.

Gross Margin increased 6.8 percentage points to 19.5%; Gross Profit grew 133% to $75 million. The improvement in gross margin is largely attributable to reduced negative EAC adjustments and improved program mix compared to 2024; the increase in gross profit is primarily driven by increased revenue and the increased gross margin.

$319 million of backlog was converted to revenue during 2025, resulting in $543 million of backlog by the end of the year.

•York delivered 21 Tranche 1 Transport Layer satellites to orbit for the Proliferated Warfighter Space Architecture (PWSA) becoming the first prime to execute an on-orbit delivery under the Tranche 1 contract. York made contact with all spacecraft within hours of launch separation.

York was a month ahead of its nearest competitor in launching these Tranche 1 Transport Layer space vehicles.

•York launched and executed more than 100 mission demonstrations for NASA’s BARD mission, exceeding baseline performance objectives and validating NASA’s transition toward a commercially delivered communications architecture in months.

•York acquired ATLAS Space Operations, combining a global ground station network with a software-defined operations platform, to eliminate ground communications bottlenecks and integrate mission critical space-to-ground connectivity into York’s end-to-end mission architecture.

•York demonstrated in-plane, cross-vendor, and space-to-ground optical laser communications. In addition, York demonstrated K-Band connectivity, orbit maneuvering, and remains the only provider ever to demonstrate Link 16 from space to ground.

•York launched the Dragoon mission under an accelerated timeline from contract signing to orbit in seven months, a 75% reduction in delivery timeline versus typical 30-month programs. After an identified agency need, York reallocated a production line platform to the mission, integrated a completely new capability, and delivered the spacecraft in-orbit, demonstrating the rapid delivery capability associated with York’s production line.

•York introduced the M-CLASS platform, expanding its architecture to support payloads up to 8kW while leveraging substantially the same core hardware and flight-proven software stack used across its S-CLASS and LX-CLASS platforms. The shared architecture enables rapid scaling into higher-power mission sets without redesigning the underlying system, significantly broadening York’s ability to support a wider range of national security, civil, and commercial customers.

•In February 2026, York finalized a $187 million commercial contract for a 20+ satellite constellation built on the M-CLASS platform, demonstrating continued growth in the commercial market.

•In March 2026, York acquired Orbion Space Technology, strengthening its supply chain with flight-proven electric propulsion systems.

As of December 31, 2025, our cash and cash equivalents were $162.6 million and availability under our Revolving Facility was $150 million, for total liquidity of $312.6 million. On January 30, 2026, York completed its IPO of 18.5 million shares of its common stock at a public offering price of $34 per share. York received net proceeds of $582.6 million, net of underwriting discounts and commissions and offering costs, further bolstering our liquidity profile. Immediately after IPO, as of January 31, 2026, our total liquidity stood at $895.4 million, inclusive of our undrawn Revolving Facility.

York Space Systems expects revenue for the full year 2026 to be in the range of $545 million to $595 million. Over 70% of this, at the midpoint, is expected to come from our existing backlog, giving us high confidence in achieving our goals, and the ability to focus on building our pipeline for beyond this year.

Business outlook is based on information as of today, March 19, 2026, and may be impacted by factors outside York’s control. See “Forward Looking Statements.”

York will host a conference call to review its financial results for the fiscal quarter and and full year 2025 and its outlook for the future and may disclose other material developments affecting its business and/or financial performance. Listeners may access the conference call live via audio webcast.

Thursday March 19, 2026

3:00 pm Mountain Time (5:00 pm Eastern Time)

Webcast: https://events.q4inc.com/attendee/615953366

York’s financial results release will be available after the close of market on March 19, 2026 on York’s website at http://ir.yorkspacesystems.com. An audio webcast replay of the conference call will be available for one year at http://ir.yorkspacesystems.com.

York Space Systems is a leading, U.S.-based, space and defense prime providing a comprehensive suite of mission-critical solutions for national security, government and commercial customers. York is one of the only space and defense primes with proprietary hardware and software capabilities designed to address customers’ complex mission requirements across the critical elements of the entire space ecosystem throughout the mission lifecycle. York is purpose built to address evolving national security space challenges and to adapt to the ongoing shift in the U.S. government’s mission needs and procurement processes, where economics, agility, rapid capabilities, and heritage drive customer decision making.

This press release and the related conference call contain “forward-looking statements” within the meaning of, and we intend such forward-looking statements to be covered by, the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified. In some cases, you can identify forward-looking statements by terminology such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “objective,” “ongoing,” “plan,” “predict,” “project,” “potential,” “should,” “will,” “would,” or the negative of these terms or other comparable terminology. In particular, statements about our 2026 outlook, future growth prospects, backlog, growth of market share, growth strategy, capabilities, the future health of our aircraft, expectations regarding government programs and actions, the markets in which we operate, including growth of our various markets, potential new products and product innovation and our expectations, beliefs, plans, strategies, objectives, prospects, assumptions, or future events or performance contained in this press release and made during the related conference call, are forward-looking statements.

Factors that could cause actual results to differ materially from those expressed or implied by the forward-looking statements include: cost overruns on our contracts, including before final receipt of a contract; concentration of our customers and backlog, in particular our largest customer, the Space Development Agency; our failure to implement and maintain an effective system of internal control over financial reporting; fluctuation of our operating results; significant competition in the global space and satellite market; our failure to manage our growth effectively and our ability to achieve and maintain profitability; any failure of our spacecraft systems and related software to operate as intended, resulting in warranty claims for product failures, schedule delays or other problems with existing or new products; our revenue, results of operations and reputation may be negatively impacted if our products contain defects or fail to operate in the expected manner; our failure to establish and maintain important relationships with government agencies and prime contractors; our dependence on contracts entered into in the ordinary course of business and our dependence on major customers and vendors; the scarcity or unavailability of critical components used to manufacture our products or used in our development programs; the emerging and shifting nature of the market for spacecraft platforms and satellite software and its failure to achieve the growth potential we expect; uncertain global macro-economic and political conditions, including the implementation of tariffs; disruptions in U.S. government operations and funding and budgetary priorities of the U.S. government; a failure of our information technology systems, physical or electronic security protections; the failure to adequately protect our proprietary intellectual property rights; the inability to comply with any of our contracts or meet eligibility requirements to obtain certain government contracts; limitations on investor insight into portions of our business due to our classified contracts with the U.S. government; the potential inability to realize our backlog; government laws and regulations, particularly those relating to contracting in the defense industry; our substantial indebtedness; and the other factors set forth in our filings with the Securities and Exchange Commission. You should not place undue reliance on these forward-looking statements, which speak only as of the date stated, or if no date is stated, as of the date of this press release and the related conference call. Actual results may vary from the estimates provided. We undertake no intent or obligation to publicly update or revise any of the estimates and other forward-looking statements made in this press release, whether as a result of new information, future events or otherwise, except as required by law.

We believe that in addition to our results determined in accordance with U.S. generally accepted accounting principles (“GAAP”), our non-GAAP financial measures including contribution margin, contribution margin %, EBITDA, and Adjusted EBITDA provide useful information to management, investors, and analysts in assessing our financial performance and results of operations across reporting periods by excluding items we do not believe are indicative of our core operating performance. In addition to our GAAP measures, we use these non-GAAP financial measures to evaluate our operating performance, generate future operating plans, and make strategic decisions, including those relating to operating expenses and the allocation of internal resources, including budgeting for infrastructure.

These non-GAAP financial measures are used to supplement the financial information presented on a GAAP basis and should not be considered in isolation or as a substitute for the relevant GAAP measures and should be read in conjunction with information presented on a GAAP basis.

Because not all companies use identical calculations, our presentation of non-GAAP measures may not be comparable to other similarly titled measures of other companies.

Non-GAAP financial measures are limited in value because they exclude certain items that may have a material impact on our reported financial results. In addition, they are subject to inherent limitations as they reflect the exercise of judgments by management about which items are adjusted to calculate our non-GAAP financial measures. We compensate for these limitations by analyzing current and future results on a GAAP basis as well as a non-GAAP basis and also by providing GAAP measures in our public disclosures.

We refer to revenue less direct material costs of revenue as “contribution margin” and contribution margin divided by revenue as “contribution margin %.” The closest comparable GAAP financial measures to contribution margin and contribution margin % are gross profit and gross profit margin %, respectively. We believe contribution margin and contribution margin % are useful measures of the variable costs that we incur in order to provide services to our customers. Our presentation of contribution margin and contribution margin % should not be construed as an inference that our future results will be unaffected by variable costs.

We define EBITDA as net income (loss) adjusted for interest expense, interest income, income tax benefit, and depreciation and amortization. Adjusted EBITDA is defined as EBITDA adjusted for changes in the fair value of derivatives, loss on debt extinguishment, transaction costs, and other non-recurring items. Net loss is the most directly comparable GAAP measure to Adjusted EBITDA. Our presentation of EBITDA and Adjusted EBITDA should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items.

For more information on our non-GAAP financial measures and a reconciliation of GAAP to non-GAAP measures, see the “Reconciliation of GAAP to Non-GAAP Results” table in this press release.

We view backlog as a key measure of our business growth. Backlog represents our estimate of the revenue we expect to realize in future periods as a result of performing work on contracts that have been awarded to us (net of any revenue already recognized as of the backlog date). We include the aggregate expected revenue of awarded contracts in our backlog upon the execution of a legally binding agreement, even though our contracts include certain termination rights exercisable by our customers with advance notice. We exclude unexercised contract options from our backlog. Contract liabilities recognized on our consolidated balance sheets consists of payments and billings that we have received in excess of revenue that we have recognized. Because cash receipts from these contracts have not been recognized into revenue, they are included in our backlog calculation.

We monitor our backlog because we believe it is a forward-looking indicator of potential sales which can be helpful to investors in evaluating the performance of our business and identifying trends over time.

Although backlog reflects business associated with contracts that are considered to be firm, terminations, amendments, or contract cancellations may occur, which could result in a reduction in our total backlog and potential future revenue that is never recognized.

Christopher Evenden

ir@yorkspacesystems.com

Sarah Nickell

Sarah.nickell@yorkspacesystems.com

(1)Represents costs for legal, advisory fees and other costs incurred in connection with York's acquisition activity and one-time IPO costs.

(2)Other includes gain on initial investment in ATLAS Space Operations, Inc., net gain on foreign exchange and one-time non-cash expense.

(1)Represents costs for legal, advisory fees and other costs incurred in connection with York's acquisition activity and one-time IPO costs.

(2)Other includes gain on initial investment in ATLAS Space Operations, Inc., net gain on foreign exchange and one-time non-cash expense.