Halozyme Confirms It Projects Zero to Minimal Impact to Royalty Revenue Through At Least 2035 Based on Newly Released Draft Medicare Drug Price Negotiation Program Proposed Rule for IPAY 2029

About this update from Halozyme Therapeutics, Inc.

SAN DIEGO, June 15, 2026 /PRNewswire/ -- Halozyme Therapeutics, Inc. (Nasdaq: HALO) ("Halozyme" or the "Company") today confirmed that the Company expects zero to minimal royalty revenue impact based on its analysis of the proposed rule for the Medicare Drug Price Negotiation Program ("Program") issued by the U.S. Centers for Medicare & Medicaid Services ("CMS") on June 12, 2026."Based on our analysis of CMS's proposed rule and the statutory framework established under the One Big Beautiful Bill Act ("OBBBA"), Halozyme projects zero to minimal impact to its royalty revenues through at least 2035. Importantly, there is also no projected impact on the Company's ability to execute new ENHANZE® partnership agreements where improving the patient treatment experience and competitive differentiation continue to be the top reasons ENHANZE is utilized," commented Dr. Helen Torley, President and Chief Executive Officer.This outlook is supported by statements in the proposed rule affirming that orphan drug protections remain applicable and addressing the impacts of biosimilar entry on Program eligibility.Halozyme will continue to engage constructively with CMS and other stakeholders to support policies that appropriately recognize innovation and preserve patient access to therapies that improve outcomes and reduce overall healthcare system burden.About HalozymeHalozyme is a biopharmaceutical company advancing disruptive solutions to improve patient experiences and outcomes for emerging and established therapies. As the innovators of ENHANZE® drug delivery technology with the proprietary enzyme rHuPH20, Halozyme's commercially-validated solution facilitates the subcutaneous delivery of injected drugs and fluids, reducing treatment burden and improving convenience. ENHANZE® has touched more than one million patient lives through ten commercialized products across over 100 global markets and is licensed to leading pharmaceutical and biotechnology companies including Roche, Takeda, Pfizer, Janssen, AbbVie, Eli Lilly, Bristol-Myers Squibb, argenx, ViiV Healthcare, Chugai Pharmaceutical, Acumen Pharmaceuticals, Merus N.V., Skye Bioscience and GSK.Halozyme expanded its drug delivery technology portfolio to develop partner products using Hypercon™ and Surf Bio's hyperconcentration technology. Hypercon™ is an innovative microparticle technology expected to set a new...

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