Penumbra, Inc. is an American medical device company headquartered in Alameda, California. The company was founded by Arani Bose and Adam Elsesser in 2004. It manufactures devices for interventional therapies to treat vascular conditions such as stroke and aneurysm. In January 2026, Boston Scientific announced it would acquire Penumbra in a $15 billion cash and stock deal. The deal was expected to close by yearend. Wikipedia