Regeneron Pharmaceuticals, Inc. (REGN)
Regeneron develops biologic medicines including the eye treatment Eylea and the immunology drug Dupixent.
Health Care stock comparison
REGN vs ZTS: which business are you actually underwriting?
Compare Regeneron Pharmaceuticals, Inc. with Zoetis Inc. using their business models, SEC classifications, fiscal calendars, current primary filings, and the research questions that matter. This is a thesis framework—not a price target or automatic winner.
- Sector
- Health
- Industry
- Same SIC
- Shared themes
- 1
- Updated
- 2026-02-12
REGN vs ZTS: quick comparison
| Company fact | REGN | ZTS |
|---|---|---|
| Company | Regeneron Pharmaceuticals, Inc. | Zoetis Inc. |
| Exchange | NASDAQ | NYSE |
| Headquarters | Not recorded | Not recorded |
| Founded | Not recorded | Not recorded |
| SEC industry | Pharmaceutical Preparations | Pharmaceutical Preparations |
| Fiscal year-end | December 31 | December 31 |
| Latest annual filing | 10-K · 2026-02-04 | 10-K · 2026-02-12 |
How the businesses differ
Zoetis Inc. (ZTS)
Zoetis develops medicines and vaccines for livestock and companion animals.
The useful starting point is not which ticker has performed better. It is whether the two companies convert the same economic forces into revenue and cash flow in the same way. REGN is classified by the SEC as Pharmaceutical Preparations, while ZTS is classified as Pharmaceutical Preparations. The matching industry code strengthens the peer comparison, although product mix can still differ materially.
Which thesis does each company fit?
Use the distinction below to decide which filing deserves deeper work. It is a research routing rule, not a recommendation or prediction.
Study REGN when…
- Drug approvals and clinical-trial readouts
- Medicare and drug-pricing policy
- Demographics and an aging population
- GLP-1 and obesity-drug demand
Study ZTS when…
- Drug approvals and clinical-trial readouts
- Medicare and drug-pricing policy
- Demographics and an aging population
- GLP-1 and obesity-drug demand
Shared research themes
US markets
SEC filing comparison and disclosure evidence
Start with primary filings because fiscal calendars and accounting presentation can make superficially similar quarters incomparable.REGN's fiscal year ends December 31, while ZTS's ends December 31. Normalize the reporting periods before comparing growth, margins, capital intensity, or guidance.
The current verified House Clerk snapshot contains 0matched transaction rows for REGNand 0 for ZTS. These delayed, range-based disclosures can identify a filing to inspect; they do not establish motive, conviction, or a real-time trading signal.
REGN primary filings
ZTS primary filings
What this comparison cannot tell you
This page does not contain licensed live prices, a valuation model, earnings estimates, portfolio constraints, or a forecast of future returns. SEC classifications can be broad, company descriptions can lag strategic change, and the latest annual filing may predate a material acquisition or divestiture. Read subsequent quarterly and current reports before making a decision.
A stronger business is not automatically the better stock. Starting valuation, expectations, capital structure, cyclicality, dilution, and the probability of each thesis determine the investment outcome. Use this comparison to frame the work, then verify the numbers in the linked filings and current company disclosures.
More comparisons involving REGN or ZTS
REGN vs ZTS FAQs
Are REGN and ZTS direct competitors?
Regeneron Pharmaceuticals, Inc. and Zoetis Inc. share the SEC industry classification “Pharmaceutical Preparations.” That makes the operating comparison relevant, but it does not prove that every product, customer, or revenue stream competes directly.
Which is better, REGN or ZTS?
There is no context-free winner. Compare the operating exposures, filing evidence, valuation, balance sheet, and risks against the specific thesis you are testing. This page deliberately does not turn a static profile into a buy or sell recommendation.
Does this REGN vs ZTS comparison include live prices?
No. Yield Theory does not republish unlicensed real-time market data. Use a regulated broker or licensed quote provider for current prices, then use the primary filings here to test the business thesis.
Where does the company information come from?
Company classifications, fiscal year-ends, and filing links come from the SEC EDGAR submissions API snapshot refreshed 2026-08-10. Business summaries and research themes are maintained by Yield Theory.
Data snapshot: SEC EDGAR submissions API, refreshed 2026-08-10. Independent educational research; not investment advice.
Go beyond REGN vs ZTS.
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