Exhibit 99.1

Lantheus Reports Second Quarter 2025 Financial Results and Provides Business Update

BEDFORD, Mass., August 6, 2025 (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 second quarter ended June 30, 2025.

“In the second quarter and the month thereafter, we completed the acquisitions of both Evergreen Theragnostics and Life Molecular Imaging – key steps in executing our strategy to expand capabilities across the radiopharmaceutical value chain, diversify revenue, including with Neuraceq, and drive future growth. At the same time, we navigated increased competition in the PSMA PET landscape, which impacted PYLARIFY performance. We are taking actions to reinforce PYLARIFY’s clinical differentiation and support the value of our PSMA PET franchise,” said Brian Markison, CEO. “Today, we announced the FDA has accepted our NDA for a new PSMA PET formulation and the Board authorized a new $400 million stock repurchase program, which reflects our confidence in our long-term strategy to deliver value for our business, patients, and shareholders.”

Summary Financial Results

Second Quarter 2025

Balance Sheet

Recent Business Highlights

Business Development Updates

Radiopharmaceutical Pipeline Updates

Other Key Updates

Full Year 2025 Updated Corporate Financial Guidance

On a forward-looking basis, the Company does not provide GAAP income per common share guidance or a reconciliation of GAAP income per common share to adjusted fully diluted EPS because the Company is unable to predict with reasonable certainty business development and acquisition related expenses, purchase accounting fair value adjustments, and any one-time, non-recurring charges. These items are uncertain,

depend on various factors, and could be material to results computed in accordance with GAAP. As a result, it is the Company’s view that a quantitative reconciliation of adjusted fully diluted EPS on a forward-looking basis is not available without unreasonable effort.  

Conference Call and Webcast

As previously announced, the Company will host a conference call and webcast on Wednesday, August 6, 2025, at 8:00 a.m. ET. To access the conference call or webcast, participants should register online at https://investor.lantheus.com/news-events/calendar-of-events.

A replay will be available approximately two hours after completion of the webcast and will be archived on the same web page for at least 30 days.

The conference call will include a discussion of non-GAAP financial measures. Reference is made to the most directly comparable GAAP financial measures, the reconciliation of the differences between the two financial measures, and the other information included in this press release, our Form 8-K filed with the SEC today, or otherwise available in the Investor Relations section of our website located at www.lantheus.com.

The conference call may include forward-looking statements. See the cautionary information about forward-looking statements in the safe-harbor section of this press release.

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, Sweden and Switzerland, Lantheus has been providing radiopharmaceutical solutions for nearly 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 net income per share - fully diluted; 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. Such forward-looking statements include our guidance for the fiscal year 2025 and our plans to expand our portfolio of late-stage assets and high potential early-stage candidates, our acquisitions of Evergreen and Life Molecular and our plans to divest our SPECT business to SHINE, 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 and penetration for our established commercial products, particularly PYLARIFY and DEFINITY, in a competitive environment and our ability to clinically and commercially differentiate our products; (ii) our ability to have third parties manufacture our products and our ability to manufacture DEFINITY in our in-house manufacturing facility, in amounts and at the times needed; (iii) the availability of raw materials, key components, and equipment, either used in the production of our products and product candidates, or in the use by healthcare professionals (“HCPs”) of our products and product candidates, including, but not limited to positron emission tomography (“PET”) scanners for PYLARIFY, MK-6240 and NAV-4694; (iv) our ability to satisfy our obligations under our existing clinical development partnerships using MK-6240 or NAV-4694 as a research tool and under the license agreements through which we have rights to MK-6240 and NAV-4694, and to further develop and commercialize MK-6240 and NAV-4694 as approved products, including the timing for any potential regulatory submissions for these investigational assets; (v) our ability to successfully integrate acquisitions, including of Life Molecular and Evergreen, including the potential for unforeseen expenses related to integration activities, the accuracy of our financial models, the potential for unforeseen liabilities within those businesses, 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; (vi) our ability to obtain U.S. Food and Drug Administration (“FDA”) approval for our new F 18 PSMA PET product candidate, to complete the technology transfer across our PET manufacturing facilities network for such new product candidate, and to obtain adequate coding, coverage and payment, including transitional pass-through payment status, for such new product candidate; (vii) our ability to complete the sale of our single-photon emission computerized tomography (“SPECT”) business to SHINE on the proposed terms or on the anticipated timeline, or at all, including risks and uncertainties related to securing the necessary regulatory approvals and satisfaction of other closing conditions to consummate the transaction, unforeseen expenses related to the divestiture, and failure to realize the expected benefits of the transaction; (viii) our ability to obtain FDA approval for LNTH-2501, our investigational kit for the preparation of Gallium-68 DOTATOC, which may be used in conjunction with a PET scan to stage and localize gastroenteropancreatic neuroendocrine tumors in adults and children, and approval for PNT2003, and to be successful in the patent litigation associated with PNT2003; (ix) the cost, efforts and timing for clinical development, regulatory approval, adequate coding, coverage and payment and successful commercialization of our product candidates and new clinical applications and territories for our products, in each case, that we or our strategic partners may undertake; (x) our ability to identify opportunities to collaborate with strategic partners and to acquire or in-license additional diagnostic and therapeutic product opportunities in oncology, neurology and other strategic areas and continue to grow and advance our pipeline of products; and (xi) the risk 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).

- Tables Follow -

Lantheus Holdings, Inc.

Consolidated Statements of Operations

(in thousands, except per share data – unaudited)

Lantheus Holdings, Inc.

Consolidated Revenues Analysis

(in thousands, except percent data – unaudited)

Lantheus Holdings, Inc.

Reconciliation of GAAP to Non-GAAP Financial Measures

(in thousands, except per share and percent data – unaudited)

Lantheus Holdings, Inc.

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

(in thousands, except per share and percent data – unaudited)

Lantheus Holdings, Inc.

Reconciliation of Free Cash Flow

(in thousands – unaudited)

Lantheus Holdings, Inc.

Condensed Consolidated Balance Sheets

(in thousands – unaudited)

###

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