Exhibit 99.1

Lantheus Reports Third Quarter 2026 Financial Results

BEDFORD, Mass., November 5, 2026 (GLOBE NEWSWIRE) -- Lantheus Holdings, Inc. (Lantheus or the Company) (NASDAQ: LNTH), the leading radiopharmaceutical-focused company committed to enabling clinicians to Find, Fight and Follow disease to deliver better patient outcomes, today reported financial results for its third quarter ended September 30, 2026.

In addition, and as previously announced, Lantheus entered into a definitive agreement on August 3, 2026 to merge with Curium under which Curium US Holdings LLC will acquire all outstanding shares of Lantheus for $102.50 per share in cash at closing, plus non-transferable Contingent Value Rights (“CVRs”) providing for up to $12.00 per share in potential additional cash payments, subject to achievement of specified commercial milestones for Lantheus’ products through 2030. The transaction represents a total per share consideration of up to $114.50 and a total transaction value of up to approximately $8.0 billion. Together, Curium and Lantheus are positioned to create a radiopharmaceutical company spanning diagnostics and therapeutics, with the infrastructure and capabilities to serve patients in more than 70 countries. The Board of Directors of Lantheus has unanimously approved the transaction. Additional information regarding the transaction is available in the Company’s Current Report on Form 8-K filed with the SEC on August 4, 2026.

In connection with the pending transaction, Lantheus is suspending its previously issued full year 2026 financial guidance and will not be hosting a conference call in connection with its third quarter 2026 results.

Summary Financial Results

Third Quarter 2026

Balance Sheet

Recent Business Highlights

About Lantheus

Lantheus is the leading radiopharmaceutical-focused company, delivering life-changing science to enable clinicians to Find, Fight and Follow disease to deliver better patient outcomes. Headquartered in Massachusetts with offices in New Jersey, Canada, Germany, Switzerland, Sweden and the United Kingdom, Lantheus has been providing radiopharmaceutical solutions for 70 years. For more information, visit www.lantheus.com.

Internet Posting of Information

The Company routinely posts information that may be important to investors in the “Investors” section of its website at www.lantheus.com. The Company encourages investors and potential investors to consult its website regularly for important information about the Company.

Non-GAAP Financial Measures

The Company uses non-GAAP financial measures, such as adjusted net income and its line components; adjusted fully diluted net income per share; adjusted operating income, and free cash flow. The Company’s management believes that the presentation of these measures provides useful information to investors. These measures may assist investors in evaluating the Company’s operations, period over period. However, these measures may exclude items that may be highly variable, difficult to predict and of a size that could have a substantial impact on the Company’s reported results of operations for a particular period. Management uses these and other non-GAAP measures internally for evaluation of the performance of the business, including the evaluation of results relative to employee performance compensation targets. Investors should consider these non-GAAP measures only as a supplement to, not as a substitute for or as superior to, measures of financial performance prepared in accordance with GAAP.

Safe Harbor for Forward-Looking and Cautionary Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, that are subject to risks and uncertainties and are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements may be identified by their use of terms such as “advance,” “believe,” “continue,” “could,” “driving,” “expect,” “guidance,” “maintain,” “may,” “on track,” “plan,” “potential,” “predict,” “progress,” “should,” “target,” “will,” “would” and other similar terms, or by express or implied discussions regarding the pending merger with Curium (the “Merger”). Such forward-looking statements include our plans to successfully execute on the commercialization of marketed products, ensure launch readiness for new products, advance a focused late-stage pipeline, and allocate capital thoughtfully, and our focus mainly on our radiodiagnostic business and pursuing value-maximizing alternatives for our radiotherapeutic assets, and are based upon current plans, estimates and expectations that are subject to risks and uncertainties that could cause actual results to materially differ from those described in the forward-looking statements. The inclusion of forward-looking statements should not be regarded as a representation that such plans, estimates and expectations will be achieved. Readers are cautioned not to place undue reliance on the forward-looking statements contained herein, which speak only as of the date hereof. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law. Risks and uncertainties that could cause our actual results to materially differ from those described in the forward-looking statements include: (i) continued market expansion, penetration and reimbursement for our established commercial products, particularly PYLARIFY, DEFINITY and Neuraceq, in a competitive environment and our ability to clinically and commercially differentiate our products; (ii) our ability to complete the technology transfer across our positron emission tomography (“PET”) manufacturing facilities (“PMF”) network for PYLARIFY TruVu, the new formulation of our F-18 prostate-specific membrane antigen (“PSMA”) PET imaging agent approved by the U.S. Food and Drug Administration (“FDA”) on March 6, 2026, to obtain FDA approval for each PMF to manufacture PYLARIFY TruVu, to maintain adequate coverage and payment for PYLARIFY TruVu, including the transitional pass-through payment status (“TPT Status”) granted by the Centers for Medicare & Medicaid Services, as announced on September 30, 2026, to have payers add Healthcare Common Procedure Coding System (“HCPCS”) code for PYLARIFY TruVu effective October 1, 2026 to their systems on a timely basis and to have customers adopt PYLARIFY TruVu; (iii) the availability of raw materials, key components, equipment, manufacturing time slots, either used in the production of our products and product candidates, or by customers of our products and product candidates, including, but not limited to PET scanners for PYLARIFY, PYLARIFY TruVu, Neuraceq, TAUKLARIFY, LNTH-2501 and NAV-4694; (iv) our ability to have third parties manufacture our products and product candidates and our ability to manufacture DEFINITY in our in-house manufacturing facility, in amounts and at the times needed; (v) our ability to satisfy our obligations under our existing clinical development partnerships using Neuraceq, MK-6240 or NAV-4694 and other assets as a research tool and under the license agreements through which we have rights to those assets, to support TAUKLARIFY (florquinitau F-18 injection), also referred to as MK-6240, which was approved by the FDA on August 14, 2026, including through our Pharma Solutions business, and to determine an appropriate path and timing toward its broader commercial availability, and to further develop and commercialize NAV-4694 as an approved product; (vi) our ability to continue to successfully integrate acquisitions, including of Lantheus Biosciences, which could be impacted by unforeseen expenses related to integration activities, the potential for unforeseen liabilities within that business, the ability to integrate disparate information technology systems, retain key talent and create a merged corporate culture that successfully realizes the full potential of the combined organization; (vii) our ability to obtain FDA approval for LNTH-2501, our investigational kit for the preparation of Gallium-68 edotreotide injection, which has been studied for use in conjunction with a PET scan to stage and localize neuroendocrine tumors in adult and pediatric patients, including satisfactorily resolving certain unresolved third-party facility inspection-related conditions identified in the Complete Response Letter issued by the FDA on June 26, 2026 and obtaining approval of a resubmitted new drug application, and to successfully commercialize LNTH-2501, if approved; (viii) the timing, execution and success of our planned commercialization of BRAVNETSA (lutetium Lu 177 dotatate), previously known as PNT2003, which received final FDA approval on September 22, 2026, including in light of competing lutetium Lu 177 dotatate products, our ability to successfully defend the favorable U.S. District Court ruling invalidating all patents asserted in the related Hatch-Waxman litigation, which is currently on appeal before the U.S. Court of Appeals for the Federal Circuit, and our dependence on POINT Biopharma Global Inc. to manufacture and supply BRAVNETSA; (ix) the cost, efforts and timing for clinical development, manufacturing, regulatory approval, adequate coding, coverage and payment and successful commercialization of our newly approved products, product candidates and new clinical applications and territories for our products, in each case, that we or our strategic partners may undertake, including the SPARROW Phase 2/3 registrational trial of LNTH-2401, and the risk of further impairment of our in-process research and development assets; (x) the timing, execution, and success of our strategic program to simplify and streamline our operations so we can focus mainly on our radiodiagnostic business and pursue value-maximizing alternatives for our radiotherapeutic assets; (xi) our ability to identify opportunities to collaborate with strategic partners and to acquire or in-license additional product opportunities in oncology, neurology and other strategic areas and continue to grow and advance our pipeline of products, subject to the restrictions on the conduct of our business under the Agreement and Plan of Merger, dated as of August 3, 2026 (the “Merger Agreement”), by and among us, Curium US Holdings LLC (the “Parent”), and Coco Merger Sub Inc.; (xii) the timing and outcome of the actions filed against us by alleged stockholders, and of demands or litigation relating to the transactions contemplated by the Merger Agreement; (xiii) the effect that changes to management could have on our business; (xiv) our ability and the ability of the Parent to

complete the transactions contemplated by the Merger Agreement, including the parties’ ability to satisfy the remaining closing conditions in the agreement, including the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (which was extended on October 21, 2026 by the Federal Trade Commission), and the receipt of other required antitrust and foreign direct investment approvals; (xv) statements about the expected time frame for completing the proposed Merger; (xvi) our and the Parent’s beliefs and expectations and statements about the benefits sought to be achieved by the proposed Merger; (xvii) the potential effects of the proposed Merger on us and the Parent, including on our relationships with customers, suppliers and employees, and the costs we have incurred and will incur in connection with the proposed Merger whether or not it is completed; (xviii) the possibility of any termination of the Merger Agreement, including in circumstances that would require us to pay a termination fee; (xix) whether any payments will be made under the contingent value rights to be issued in the proposed Merger; and (xx) the risks and uncertainties discussed in our filings with the Securities and Exchange Commission (including those described in the Risk Factors section in our Annual Reports on Form 10-K and our Quarterly Reports on Form 10-Q). 

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Lantheus Holdings, Inc.

Consolidated Statements of Operations

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Lantheus Holdings, Inc.

Consolidated Revenues Analysis

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Lantheus Holdings, Inc.

Reconciliation of GAAP to Non-GAAP Financial Measures

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Lantheus Holdings, Inc.

Reconciliation of GAAP to Non-GAAP Financial Measures (Continued)

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Lantheus Holdings, Inc.

Reconciliation of Free Cash Flow

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Lantheus Holdings, Inc.

Condensed Consolidated Balance Sheets

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Contacts:

Mark Kinarney

Vice President, Investor Relations

978-671-8842

ir@lantheus.com

Melissa Downs

Executive Director, External Communications

646-975-2533

media@lantheus.com