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Filed by Lantheus Holdings, Inc. Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Progenics Pharmaceuticals, Inc. Commission File No.: 000 – 23143 The following is a slide deck relating to the proposed transaction involving Lantheus Holdings, Inc. and Progenics Pharmaceuticals, Inc. available at www.lantheusprogenics.transactionannouncement.com.


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Corporate Presentation May 2020


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Safe Harbor Statements Important Information For Investors And Stockholders This document does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to appropriate registration or qualification under the securities laws of such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended. In connection with the proposed transaction, Lantheus filed with the Securities and Exchange Commission (“SEC”) a registration statement on Form S-4 on November 12, 2019, as amended by Amendment No. 1 to that registration statement filed with the SEC on March 16, 2020, that includes a joint proxy statement of Lantheus and Progenics that also constitutes a preliminary prospectus of Lantheus. The registration statement was declared effective by the SEC on March 18, 2020, and Lantheus and Progenics commenced mailing the joint proxy statement/prospectus to stockholders of Lantheus and Progenics on or about March 19, 2020. INVESTORS AND SECURITY HOLDERS OF LANTHEUS AND PROGENICS ARE STRONGLY ENCOURAGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders are able to obtain free copies of the registration statement and the joint proxy statement/prospectus and other documents filed with the SEC by Lantheus or Progenics through the website maintained by the SEC at https://www.sec.gov. Copies of the documents filed with the SEC by Lantheus will also be available free of charge on Lantheus’ website at https://www.lantheus.com/ or by contacting Lantheus’ Investor Relations Department by email at ir@lantheus.com or by phone at (978) 671-8001. Copies of the documents filed with the SEC by Progenics will also be available free of charge on Progenics’ internet website at https://www.progenics.com/ or by contacting Progenics’ Investor Relations Department by email at mdowns@progenics.com or by phone at (646) 975-2533. Certain Information Regarding Participants Lantheus, Progenics, and their respective directors and executive officers may be considered participants in the solicitation of proxies in connection with the proposed transaction. Information about the directors and executive officers of Lantheus is set forth in its Annual Report on Form 10-K for the year ended December 31, 2019, which was filed with the SEC on February 25, 2020, and its definitive proxy statement for its 2020 annual meeting of stockholders, which was filed with the SEC on March 12, 2020. Other information regarding the participants of Lantheus in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC regarding the proposed transaction when they become available. Information about the directors and executive officers of Progenics is set forth in its Annual Report on Form 10-K for the year ended December 31, 2019, which was filed with the SEC on March 13, 2020. Other information regarding the participants of Progenics in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC regarding the proposed transaction when they become available. You may obtain these documents (when they become available) free of charge through the website maintained by the SEC at https://www.sec.gov and from Investor Relations at Lantheus or Progenics as described above. 2


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Safe Harbor Statements Cautionary Statement Regarding Forward-Looking Statements This document contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 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. Such statements are based upon current plans, estimates and expectations that are subject to various risks and uncertainties. The inclusion of forward-looking statements should not be regarded as a representation that such plans, estimates and expectations will be achieved. Words such as “anticipate,” “expect,” “project,” “intend,” “believe,” “may,” “will,” “should,” “plan,” “could,” “target,” “contemplate,” “estimate,” “predict,” “potential,” “opportunity,” “creates” and words and terms of similar substance used in connection with any discussion of future plans, actions or events identify forward-looking statements. All statements, other than historical facts, including the expected timing of the closing of the merger; the ability of the parties to complete the merger considering the various closing conditions; the expected benefits of the merger, such as efficiencies, cost savings, synergies, revenue growth, creating shareholder value, growth potential, market profile, enhanced competitive position, and financial strength and flexibility; the competitive ability and position of the combined company; and any assumptions underlying any of the foregoing, are forward-looking statements. Important factors that could cause actual results to differ materially from Lantheus’ and Progenics’ plans, estimates or expectations could include, but are not limited to: (i) Lantheus or Progenics may be unable to obtain stockholder approval as required for the merger; (ii) conditions to the closing of the merger may not be satisfied; (iii) the merger may involve unexpected costs, liabilities or delays; (iv) the effect of the announcement of the merger on the ability of Lantheus or Progenics to retain and hire key personnel and maintain relationships with customers, suppliers and others with whom Lantheus or Progenics does business, or on Lantheus’ or Progenics’ operating results and business generally; (v) Lantheus’ or Progenics’ respective businesses may suffer as a result of uncertainty surrounding the merger and disruption of management’s attention due to the merger; (vi) the outcome of any legal proceedings related to the merger; (vii) Lantheus or Progenics may be adversely affected by other economic, business, and/or competitive factors, including the ongoing COVID-19 pandemic; (viii) the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; (ix) risks that the merger disrupts current plans and operations and the potential difficulties in employee retention as a result of the merger; (x) the risk that Lantheus or Progenics may be unable to obtain governmental and regulatory approvals required for the transaction, or that required governmental and regulatory approvals may delay the transaction or result in the imposition of conditions that could reduce the anticipated benefits from the proposed transaction or cause the parties to abandon the proposed transaction; (xi) risks that the anticipated benefits of the merger or other commercial opportunities may otherwise not be fully realized or may take longer to realize than expected; (xii) the impact of legislative, regulatory, competitive and technological changes; (xiii) expectations for future clinical trials, the timing and potential outcomes of clinical studies and interactions with regulatory authorities; and (xiv) other risks to the consummation of the merger, including the risk that the merger will not be consummated within the expected time period or at all. Additional factors that may affect the future results of Lantheus and Progenics are set forth in their respective filings with the SEC, including each of Lantheus’ and Progenics’ most recently filed Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other filings with the SEC, which are available on the SEC’s website at www.sec.gov. Readers are urged to consider these factors carefully in evaluating these forward-looking statements, and not to place undue reliance on any forward-looking statements. Readers should also carefully review the risk factors described in other documents that Lantheus and Progenics file from time to time with the SEC. The forward-looking statements in this document speak only as of the date of these materials. Except as required by law, Lantheus and Progenics assume no obligation to update or revise these forward-looking statements for any reason, even if new information becomes available in the future. 3


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The Lantheus Story 4 1 Market Leader Where We Are Today 4 Strong Capital Position To Fund Our Future 2 Targeting Growing Markets 3 Enhancing Growth from a Position of Strength


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Lantheus Overview #1 in Ultrasound Contrast Agents Dynamic Pipeline Operational Excellence Leader in Radio-pharmaceuticals Company Overview Global leader in the development, manufacture and commercialization of innovative medical diagnostics Our products help healthcare professionals identify disease and improve patient management Innovating in Microbubble applications Pioneer in Radiopharmaceutical Diagnostics Across Microbubble and Radiopharmaceuticals Manufacturing, Supply Chain and Commercial Expertise 5


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Corporate Timeline 1956 New England nuclear (NEN) founded 1981 1991 2001 2008 DUPONT purchases NEN DuPont forms venture with Merck called DuPont Merck DuPont buys Merck’s interest, becomes DuPont Pharmaceuticals Bristol Myers Squibb Co. purchases DuPont Pharmaceuticals BMS sells BMS Medical Imaging to Avista Capital Partners, Lantheus medical imaging launched LNTH IPO on Nasdaq 1998 2015 LNTH bod approves merger agreement to buy progenics pharmaceuticals 2019 U.S. FDA Approves DEFINITY 6 U.S. FDA Approves Cardiolite 1990 1976 U.S. FDA Approves TechneLite


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Current Product Portfolio * Based on 2019 Worldwide Revenue ($ in millions) ** Source for DEFINITY market share: AMR Echocardiography Monthly Monitor, December 2019. Source for TechneLite market share: LMI internal estimates. *** 3-year CAGR (2016-2019) Revenue 2019* / % of Revenue Key Product / U.S. Market Share** Growth Rate*** $218M / 63% DEFINITY / ~80% ~18% $146M / 37% TechneLite / ~33% Overall stable Ultrasound Contrast Imaging Agents Radiopharmaceuticals and Other 7


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A Corporate Footprint Balanced By Unique Core Competencies * - We currently believe that, if approved by the FDA, the modified formulation could become commercially available in early 2021, although that timing cannot be assured. ** - Group Purchasing Organizations (GPOs) and Integrated Delivery Networks (IDNs) Expertise in microbubbles World market leader in ultrasound contrast Room temperature formulation (early 2021)* New applications New geographies Strength in direct distribution, logistics and sales Hospitals Clinics Group practices Development and commercialization capabilities in nuclear isotopes 8 commercial products – 7 imaging products & one therapeutic product Most successful radiopharmaceutical imaging agent launched to date – Cardiolite Strong relationships Cardiologists Nuclear medicine physicians Technologists Sonographers Seasoned and experienced management team Pharma / Biotech / Medical Device expertise Tenured and highly specialized field personnel Long-standing channel relationships Most diversified Moly supply chain Contracted relationships with 5 leading US radiopharmacy chains GPOs and IDNs** 8


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The Lantheus Story 9 1 Market Leader Where We Are Today 4 Strong Capital Position To Fund Our Future 2 Targeting Growing Markets 3 Enhancing Growth from a Position of Strength


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Large, Growing Global Markets * 5-year CAGR Source: GlobalData, Sept 2019 Source: MedRaysIntell, July 2019 Global Diagnostic Imaging Market ($B) Global Nuclear Medicine Market ($B) 12% CAGR 2019 – 2024* 14% CAGR 2019 – 2024*


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Large Echocardiography Market Opportunity — in the U.S. Alone ~2% Annual Growth Rate in Total Echocardiograms Source: AMR Echocardiography Monthly Monitor, December 2019 Note: Circles not drawn to scale Currently, Lantheus has ~80% market share of contrast imaging agent use. Current addressable market — contrast penetration of suboptimal U.S. Echocardiograms 35.2M Potential Market – Suboptimal – ~7M ~80%


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U.S. Tc-99m Market: ~$225 MM Generator Market Driven Primarily by Cardiac Studies 12 MM = millions Source: AMR PADDS 2018 database, LMI internal market assessment * - LMI estimate for market share 2016 - 2019 Tc99m SPECT Annual Procedure Volume 9 – 10 million ~ ~ Annual Tc-99m SPECT Studies Other Tc-99m SPECT Studies ~9 MM 60% - 70% Tc-99m Market Size 30% - 40%* ~$225 MM Market Dynamics ~9 MM annual SPECT studies utilize Tc-99m, with ~60% of those Myocardial Perfusion studies While number of studies in the TC-99m market is declining 1 – 3% per year, this decline is offset by price PET-based studies and related use of isotopes gaining interest


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The Lantheus Story 1 Market Leader Where We Are Today 4 Strong Capital Position To Fund Our Future 2 Targeting Growing Markets 3 Enhancing Growth from a Position of Strength


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Lantheus 2.0 Areas of Strategic Focus* Note: Assumes closing of the merger with Progenics * - Neuroendocrine tumors Microbubbles Nuclear 2.0 Diagnostics Nuclear 2.0 Theranostics Pro Forma Product Portfolio Flurpiridaz F 18 Cardiac Multi-Therapeutic Applications NM-01 Immuno-Oncology LMI 1195 Neuroendocrine Tumors 1095 PyL AI Prostate Lantheus 2.0 Vision Sustain and Accelerate Revenue Growth Diversified Portfolio of Diagnostics and Radiopharmaceutical Therapeutics Global Reach Attractive Margins * - Assumes closing of the merger with Progenics Cardiac


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Progenics Acquisition - Executing a Compelling Strategic Opportunity Robust portfolio and pipeline of precision diagnostic and therapeutic products Proven leadership with strong commercial, operational and financial expertise; aligned with stockholder interests Sustainable and diversified revenue growth with focus on commercial execution excellence Attractive financial profile and strengthened cash flow generation, with attention to cost synergy opportunities that support enhanced stockholder returns Driving strategic pipeline investments to capitalize on market opportunities and maximize returns


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DEFINITY Unparalleled market and brand position Dedicated salesforce drives advocacy and awareness Long-standing relationships with sonographers/echocardiologists Four Orange Book-listed patents in total Room temperature formulation has patent protection to 2035 Radiopharmaceuticals Wide range of diagnostic imaging for cardiac perfusion, pulmonary function, and cerebral blood flow Unique expertise including complex supply chain logistics Cardiolite–most used diagnostic product launched (U.S. to date) Well-balanced Portfolio of Marketed Assets Serving Precision Diagnostics


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AZEDRA First/only FDA-approved treatment for adults and pediatric patients 12 and older with iobenguane scan positive, unresectable, locally advanced or metastatic PPGL* who require systemic anticancer therapy Additionally a Portfolio of Key Products Addressing Unique Unmet Needs in Oncology RELISTOR Only pharmacotherapy with oral and subcutaneous formulations to treat opioid-induced constipation (OIC) in adults with chronic pain – targeted action treats the cause of OIC Licensed to Bausch Health QUADRAMET Injectable radiopharmaceutical primarily used to treat pain associated with osteoblastic and mixed bone metastases confirmed on radionuclide bone scan Automated Bone Scan Index Software as a medical device is designed to quantify the disease burden in bone scans of metastatic prostate cancer patients Complementary products position the combined company to better serve patients * - Pheochromocytoma or Paraganglioma


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Legend: DISCOVERY PRECLINICAL PHASE 1 PHASE 2 PHASE 3 FILING DEFINITY Flurpiridaz F 18 LMI 1195 F 18 Cerevast Retinal Vein Occlusion Technology CarThera SonoCloud for Glioblastoma NM-01 99mTc PyL™ F 18 1095 I-131 1404 99mTc PSMA TTC Th 227 PSMA AI NCE/NBE Precision Diagnostic Robust Combined Pipeline with Clear Value Drivers Development Partners NCE/NBE Therapeutic Progenics developing Licensed in Europe by Curium Progenics developing Licensed in Europe by ROTOP Progenics developing Progenics partnership with Bayer5 Lantheus in partnership with GE Healthcare1 Lantheus developing Lantheus partnership with Cerevast2 Lantheus partnership with NanoMab4 Lantheus developing GE Healthcare is conducting the second phase 3 study. Clinical development program conducted by Cerevast. Clinical development program conducted by CarThera. Ongoing Phase 1 clinical development conducted by NanoMab. Clinical development program conducted by Bayer. Life Cycle Management Digital Solution NCE: New Chemical Entity; NBE New Biologic Entity Note: Assumes closing of the merger with Progenics Lantheus partnership with CarThera3


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Proven Management Team With Deep Industry Expertise Mary Anne Heino President and Chief Executive Officer Mike Duffy SVP — Law and Public Policy, General Counsel Robert Marshall Chief Financial Officer and Treasurer John Bolla Chief Operations Officer Etienne Montagut SVP — Corporate Development Carol Walker SVP — Quality 19 Paul Blanchfield Chief Commercial Officer Istvan Molnar, M.D. Chief Medical Officer


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The Lantheus Story 1 Market Leader Where We Are Today 4 Strong Capital Position to Fund Our Future 2 Targeting Growth Markets 3 Enhancing Growth from a Position of Strength


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Strong Balance Sheet and Financial Flexibility Strong Balance Sheet (Q1 2020)* Decline in Net Debt Resources (Q1 2020)* Generating $40-60M Free Cash Flow annually $365M $193M Net Leverage Cash on hand Available revolving credit $96M $200M 1.4x Figures as of Q1 2020. On April 1, 2020, the Company drew down $100.0 million under its 2019 Revolving Facility


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Appendix


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Robust Combined Pipeline with Clear Value Drivers Life Cycle Management DISCOVERY PRECLINICAL PHASE 1 PHASE 2 PHASE 3 FILING DEFINITY Octafluoropropane - Room Temperature Formulation Development Partners Lantheus developing


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Robust Combined Pipeline with Clear Value Drivers NCE: New Chemical Entity GE Healthcare is conducting the second phase 3 study. Ongoing Phase 1 clinical development conducted by NanoMab. NCE Precision Diagnostic DISCOVERY PRECLINICAL PHASE 1 PHASE 2 PHASE 3 FILING Flurpiridaz F 18 PET Myocardial Perfusion Imaging LMI 1195 Flubrobenguane - Neuroendocrine Tumors in Pediatric / Adult Populations NM-01 99mTc Anti-PD-L1 Biomarker Single-Domain Antibody PyL™ F 18 PSMA-targeted PET / CT Imaging Agent 1404 99mTc PSMA-targeted SPECT / CT Imaging Agent Development Partners Lantheus in partnership with GE Healthcare1 Lantheus developing Lantheus partnership with NanoMab2 Progenics developing. Licensed in Europe by Curium Progenics licensed to ROTOP in Europe


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Robust Combined Pipeline with Clear Value Drivers NCE: New Chemical Entity; NBE New Biologic Entity NCE/NBE Therapeutics DISCOVERY PRECLINICAL PHASE 1 PHASE 2 PHASE 3 FILING Cerevast Retinal Vein Occlusion Technology Proprietary therapeutic ultrasound technology - Microbubble Franchise CarThera SonoCloud for Glioblastoma Proprietary therapeutic ultrasound technology - Microbubble Franchise 1095 I-131 PSMA-targeted Small Molecule Therapeutic PSMA TTC Th 227 PSMA-targeted Conjugate Therapeutic Development Partners Lantheus partnership with Cerevast1 Lantheus partnership with CarThera2 Progenics developing Progenics partnership with Bayer3 Clinical development program conducted by Cerevast. Clinical development program conducted by CarThera. Clinical development program conducted by Bayer.


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Robust Combined Pipeline with Clear Value Drivers Digital Solution DISCOVERY PRECLINICAL PHASE 1 PHASE 2 PHASE 3 FILING PSMA AI Automated reading of PSMA images using AI Development Partners Progenics developing


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Radiopharmaceutical Business Model Defined by Unique Features Highly Complex – Supply Chain & Logistics Specialized - Product Development & Commercialization Capabilities in Nuclear Medicine Highly Regulated - >30 Local, State, Federal, & International Agencies Stakeholders - Strong Relationships with Radiopharmacies, Hospitals and Payers Limited - Number of Nuclear Isotope Suppliers Worldwide


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Corporate Presentation May 2020