Penumbra, Inc.

Penumbra, Inc. is an Alameda, California medical device company that builds tools to pull life-threatening blood clots out of the body. Founded in 2004 by attorney-turned-CEO Adam Elsesser and neuro-interventional surgeon Dr. Arani Bose, it pioneered aspiration-based mechanical thrombectomy for acute ischemic stroke and expanded into peripheral, venous, and pulmonary clot removal with its Indigo and Lightning Flash systems. The company also runs an Immersive Healthcare arm using virtual reality (the REAL System) for rehabilitation and wellness. Public on the NYSE since 2015 under ticker PEN, Penumbra posted $1.4 billion in 2025 revenue and agreed in January 2026 to be acquired by Boston Scientific in a roughly $14.5 billion deal.