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).

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Consolidated Statements of Operations

(in thousands, except per share data – unaudited)

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Consolidated Revenues Analysis

(in thousands, except percent data – unaudited)

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Reconciliation of GAAP to Non-GAAP Financial Measures

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

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

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

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Reconciliation of Free Cash Flow

(in thousands – unaudited)

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Condensed Consolidated Balance Sheets

(in thousands – unaudited)

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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

Exhibit 99.2

Lantheus Announces FDA Acceptance of NDA for New Formulation for Market-Leading PSMA PET Imaging Agent

Designed to expand PSMA PET imaging access for patients by increasing batch size by ~50% and enhancing supply resilience

PDUFA date set for March 6, 2026

BEDFORD, Mass., August 6, 2025 – Lantheus Holdings, Inc. (“Lantheus”) (NASDAQ: LNTH), the leading radiopharmaceutical-focused company committed to enabling clinicians to Find, Fight and Follow disease to deliver better patient outcomes, today announced that the Food and Drug Administration (FDA) has accepted a New Drug Application (NDA) for a new formulation of its F 18 PSMA imaging agent filed by its affiliate, Aphelion. The FDA has set an action date goal of March 6, 2026 under the Prescription Drug User Fee Act (PDUFA).

This NDA acceptance builds on the success of Lantheus’ market-leading PSMA PET imaging agent, PYLARIFY, which has demonstrated high diagnostic performance and meaningful impact on clinical decision making. If approved, we expect that this new formulation will offer an efficacy consistent with the market-leading PSMA PET agent, PYLARIFY, which has demonstrated an 86% median true-positive rate based on three independent readers in a study of patients with recurrent prostate cancer based on rising PSA after therapy. 1

“We are pleased the FDA accepted Aphelion’s NDA for the new piflufolastat F 18 formulation, which we expect will improve patient access due to a significant increase in the number of doses per batch,” said Brian Markison, CEO, Lantheus. “This formulation is a natural next step in our commitment to advancing PSMA imaging. There is a growing burden of prostate cancer in the U.S. and a clear need for accurate and early detection. Building on PYLARIFY’s proven performance and accuracy, Lantheus is well-positioned for continued leadership in prostate cancer imaging.”

This new formulation optimizes the manufacturing process and is expected to increase batch size by ~50%, allowing Lantheus to serve significantly more patients while maintaining the same high standards that has made PYLARIFY the trusted choice for providers. The new formulation increases the radioactive concentration of the agent and has the potential to expand patient access in new geographic locations.

“We have reached a key milestone and delivered on our commitment to advance prostate cancer imaging through sustainable innovation,” said Paul Blanchfield, President, Lantheus. “By enhancing the efficiency of production, we expect to improve patient access, streamline operations, and support the broader healthcare system’s ability to deliver timely diagnostic imaging.”

About Prostate Cancer

In the U.S., prostate cancer is the second most frequently diagnosed cancer and fifth-leading cause of cancer-related deaths among men globally. For 2025, estimates suggest nearly 315,000 new cases and

more than 35,000 deaths.2 Projections indicate a significant increase in prostate cancer incidence, with annual cases expected to nearly double to 2.9 million by 2040.3 This is largely attributed to aging populations and increased life expectancy, particularly in low- and middle-income countries where healthcare access and early detection may be limited.

About PYLARIFY® (piflufolastat F 18) Injection

PYLARIFY® (piflufolastat F 18) injection (also known as 18F-DCFPyL or PyL) is a fluorinated small molecule PSMA-targeted PET imaging agent that enables visualization of lymph nodes, bone and soft tissue metastases to determine the presence or absence of recurrent and/or metastatic prostate cancer. For men with prostate cancer, PYLARIFY PET combines the accuracy of PET imaging, the precision of PSMA targeting and the clarity of an F 18 radioisotope for superior diagnostic performance. The recommended PYLARIFY dose is 333 MBq (9 mCi) with an acceptable range of 296 MBq to 370 MBq (8 mCi to 10 mCi), administered as a bolus intravenous injection.3-9

PYLARIFY has made a profound impact on the lives of patients battling prostate cancer. It is the number one ordered PSMA PET imaging agent in the U.S., and is a proven diagnostic backed by real-world experience, including in over 500,000 scans across 48 states, Puerto Rico and Washington, D.C.

PYLARIFY® (piflufolastat F 18) Injection

Indication

PYLARIFY® (piflufolastat F 18) Injection is a radioactive diagnostic agent indicated for positron emission tomography (PET) of prostate-specific membrane antigen (PSMA) positive lesions in men with prostate cancer:

Important Safety Information

Contraindications

None.

Warnings and Precautions

Risk of Image Misinterpretation

Imaging interpretation errors can occur with PYLARIFY imaging. A negative image does not rule out the presence of prostate cancer and a positive image does not confirm the presence of prostate cancer. The performance of PYLARIFY for imaging of patients with biochemical evidence of recurrence of prostate cancer seems to be affected by serum PSA levels. The performance of PYLARIFY for imaging of metastatic pelvic lymph nodes prior to initial definitive therapy seems to be affected by risk factors such as Gleason score and tumor stage. PYLARIFY uptake is not specific for prostate cancer and may occur with other types of cancer as well as non-malignant processes and in normal tissues. Clinical correlation, which may include histopathological evaluation of the suspected prostate cancer site, is recommended.

Hypersensitivity Reactions

Monitor patients for hypersensitivity reactions, particularly patients with a history of allergy to other drugs and foods. Reactions may be delayed. Always have trained staff and resuscitation equipment available.

Radiation Risks

Diagnostic radiopharmaceuticals, including PYLARIFY, expose patients to radiation. Radiation exposure is associated with a dose-dependent increased risk of cancer. Ensure safe handling and preparation procedures to protect patients and health care workers from unintentional radiation exposure. Advise patients to hydrate before and after administration and to void frequently after administration.

Adverse Reactions

The most frequently reported adverse reactions were headaches, dysgeusia and fatigue, occurring at rate of ≤2% during clinical studies with PYLARIFY. In addition, a delayed hypersensitivity reaction was reported in one patient (0.2%) with a history of allergic reactions.

Drug interactions

Androgen deprivation therapy (ADT) and other therapies targeting the androgen pathway, such as androgen receptor antagonists, may result in changes in uptake of PYLARIFY in prostate cancer. The effect of these therapies on performance of PYLARIFY PET has not been established.

To report suspected adverse reactions for PYLARIFY, call 1-800-362-2668 or contact FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. Please read the accompanying full Prescribing Information also available at PYLARIFY.com.

Safe Harbor for Forward-Looking and Cautionary Statements

This press release contains “forward-looking statements” that are subject to risks and uncertainties. Forward-looking statements include, but are not limited to, statements relating to the potential FDA approval of the NDA for a new formulation of piflufolastat F18, the Company’s F-18 based PET imaging agent and statements regarding Lantheus’ expectations, hopes, beliefs, intentions or strategies regarding the future. Forward-looking statements may be identified by their use of terms such as “aim,” “designed,” “expect,” “expected,” “will” and other similar terms. Such forward-looking statements 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, including our ability to obtain FDA approval for our new formulation of PYLARIFY, to complete the technology transfer across our PET manufacturing facilities network for such new formulation, and to obtain adequate coding, coverage and payment, as well as 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).

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.

1Morris MJ, et al; CONDOR Study Group. Diagnostic Performance of 18F-DCFPyL-PET/CT in Men with Biochemically Recurrent Prostate Cancer: Results from the CONDOR Phase III, Multicenter Study. Clin Cancer Res. 2021 Jul 1;27(13):3674-3682. doi: 10.1158/1078-0432.CCR-20-4573. Epub 2021 Feb 23. PMID: 33622706; PMCID: PMC8382991.

2American Cancer Society. Cancer Facts & Figures 2025. Atlanta: American Cancer Society; 2025. Available at https://www.cancer.org/research/cancer-facts-statistics/all-cancer-facts-figures/2025-cancer-facts-figures.html

3Harris E. Prostate Cancer Cases Might Rise to 3 Million Globally by 2040. JAMA. 2024;331(20):1698. doi:10.1001/jama.2024.6729

4PYLARIFY® [package insert]. North Billerica, MA: Progenics Pharmaceuticals, Inc., a Lantheus company.

5Data on file. Bedford, MA: Progenics Pharmaceuticals, Inc.; 2024.

6Mena E, Lindenberg ML, Turkbey IB, et al. 18F-DCFPyL PET/CT imaging in patients with biochemically recurrent prostate cancer after primary local therapy. J Nucl Med. 2020;61(6):881-889.

7Werner RA, Derlin T, Lapa C, et al. 18F-labeled, PSMA-targeted radiotracers: leveraging the advantages of radiofluorination for prostate cancer molecular imaging. Theranostics. 2020;10(1):1-16.

8Alipour R, Azad A, Hofman MS. Guiding management of therapy in prostate cancer: time to switch from conventional imaging to PSMA PET? Ther Adv Med Oncol. 2019;11:1-14.

9Petersen LJ, Zacho HD. PSMA PET for primary lymph node staging of intermediate and high-risk prostate cancer: an expedited systematic review. Cancer Imaging. 2020;20(1):10.

Contacts:

Lantheus

Mark Kinarney

Vice President, Investor Relations

978-671-8842

ir@lantheus.com

Melissa Downs

Executive Director, External Communications

646-975-2533

media@lantheus.com