Halozyme is a focused drug‑delivery royalty company. Its ENHANZE technology enables rapid, large‑volume subcutaneous injections for many of the world’s best‑selling biologics, creating a high‑margin, recurring royalty stream with long visibility.
Recent U.S. and EU approvals materially broaden the base: Roche’s Tecentriq Hybreza and Ocrevus Zunovo, and BMS’s Opdivo Qvantig now join established drivers like Darzalex SC and Phesgo, while RYBREVANT SC was cleared in Europe.
First‑half 2025 royalty revenue rose 52% year over year and total revenue grew 38%, and management raised full‑year 2025 guidance after strong Q1 and Q2 prints. Economics are attractive and increasingly diversified across partners and indications.
Halozyme generated $253.9 million of operating cash flow in the first half of 2025 with just $2.5 million of capex, and ended Q2 2025 with $548.2 million in cash and marketable securities.
Our TTM free cash flow estimate through Q2 2025 is about $541 million, based on H2 2024 plus Q1 and Q2 2025. Convertible notes of $1.525 billion mature in 2027 and 2028, but net leverage remains manageable relative to cash generation and guidance.
A newly granted ENHANZE European patent extends royalty durability in Europe to March 2029, and the announced Elektrofi acquisition adds a second delivery platform that could extend the company’s relevance into the 2030s and 2040s.
Key risks include potential competition from alternative hyaluronidase providers for new subcutaneous launches (for example, Merck’s Keytruda SC) and patent litigation outcomes.
Halozyme’s moat is built on switching costs, partner integration, and a defended IP estate. ENHANZE enables rapid subcutaneous administration of large‑volume biologics, saving infusion center time and supporting patient preference. Once integrated, partners tend to scale indications and geographies, reinforcing long‑duration, high‑margin royalties.
The portfolio spans oncology and neurology across Roche, J&J, BMS, argenx, Takeda and others, with 10 commercial products and a 100% regulatory approval track record on filed ENHANZE programs.
Patent durability improved in Europe to March 2029. Risks include technological substitutes (alternative hyaluronidases or high‑concentration formulations without hyaluronidase) and litigation around non‑ENHANZE IP in the PD‑1 class. The Elektrofi deal adds a second, complementary technology to extend relevance beyond current patents.
Halozyme does not set end‑product prices; pricing power is indirect through royalty rate structures, license fees, and milestones. Its leverage stems from partners’ willingness to pay to unlock faster administration and clinic efficiency.
The newly validated EU patent preserves original royalty rates on Darzalex SC through March 2029, signaling some pricing durability. As more products launch and move outside infusion centers, the platform’s value to partners can support favorable economics in new licenses.
Revenue is increasingly recurring and diversified. Royalty revenue grew 52% year over year in the first half of 2025; Q2 2025 royalties increased 65% year over year.
Recent approvals for Tecentriq Hybreza, Ocrevus Zunovo, Opdivo Qvantig, and EU RYBREVANT SC expand the base, while additional partnered programs continue through late‑stage development. Patient and clinic time‑savings preferences support adoption of subcutaneous options, improving long‑term visibility.
TTM free cash flow through Q2 2025 is about $541 million, based on H2 2024 plus Q1 and Q2 2025, with minimal capex requirements. As of June 30, 2025, cash and marketable securities were $548.2 million. Convertible notes total $1.525 billion due 2027 and 2028; interest expense remains modest.
Net leverage is reasonable relative to adjusted EBITDA guidance, and there is an undrawn revolver. The Elektrofi deal is structured with cash and existing credit and is expected to keep leverage around 2x immediately post close.
Management has balanced internal investment with disciplined repurchases and targeted M&A.
The company executed a $750 million buyback authorization in tranches during 2024–2025, reducing shares outstanding to about 117 million by July 31, 2025. The 2024 Evotec approach was withdrawn when engagement was not possible, indicating willingness to walk.
The announced Elektrofi acquisition expands the platform with potential long‑dated royalty streams while reaffirming 2025 guidance.
CEO Helen Torley has overseen the pivot to a durable royalty platform and consistent execution with partners, evidenced by multiple approvals and raised guidance. Communications are clear, guidance has been conservative then raised, and capital returns have been sizable.
Management is proactively defending IP, including a 2025 lawsuit related to Keytruda SC, and broadening the technology stack via M&A.

Is Halozyme Therapeutics, a good investment at $72?
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