# Regeneron Pharmaceuticals founding date entity: /record/regeneron-pharmaceuticals.md predicate: founded page: /record/regeneron-pharmaceuticals/founded as_of: 2026-11-14 cite: AsOf. "Regeneron Pharmaceuticals founded: 1988", as of 1988-01-01. Claim clm_80687BA8375E, https://asof.is/claim/clm_80687BA8375E, accessed 2026-11-14. Source: https://www.regeneron.com/about/leadership/leonard-schleifer. As of November 14, 2026, Regeneron Pharmaceuticals's founding date on the AsOf record is 1,988, dated January 1, 1988, from a primary source (regeneron.com). 1 claim on Regeneron Pharmaceuticals's founding date, 1 open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted. ## Current founding date What the record asserts on 2026-11-14. - [Regeneron Pharmaceuticals](/record/regeneron-pharmaceuticals.md) | founded | 1988 | valid 1988-01-01 to present | conf 0.95 | valid | [clm_80687BA8375E](/claim/clm_80687BA8375E.md) sources: https://www.regeneron.com/about/leadership/leonard-schleifer ## Every dated value One claim per line, oldest first. Superseded claims stay visible. - [Regeneron Pharmaceuticals](/record/regeneron-pharmaceuticals.md) | founded | 1988 | valid 1988-01-01 to present | conf 0.95 | valid | [clm_80687BA8375E](/claim/clm_80687BA8375E.md) sources: https://www.regeneron.com/about/leadership/leonard-schleifer ## Questions this record answers ### What is Regeneron Pharmaceuticals's current founding date? 1,988, dated January 1, 1988, from a primary source (regeneron.com). The record asserts this claim as of November 14, 2026 (status valid, confidence 0.95). ## Read on - This page: /record/regeneron-pharmaceuticals/founded (markdown: /record/regeneron-pharmaceuticals/founded.md) - Entity twin: /record/regeneron-pharmaceuticals.md ยท timeline: /timelines/regeneron-pharmaceuticals.md - Every company's founding date: /facts/founded.md --- AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.