On June 9, 2017, Penumbra, Inc. (the “Company”) initiated a voluntary field removal of four lots of its 3D Revascularization Devices, based on the Company’s identification of an issue involving a raw material component of the devices. These lots were distributed between May 15, 2017 and June 7, 2017. The Company does not currently expect that this voluntary action will have a material impact on its previously issued revenue guidance.

About Penumbra, Inc. (NYSE:PEN)

Penumbra, Inc. (Penumbra) is an interventional therapies company. The Company designs, develops, manufactures and markets medical devices. The Company has a portfolio of products that addresses medical conditions and significant clinical needs across two markets, neuro and peripheral vascular. The conditions that its products address include ischemic stroke, hemorrhagic stroke and various peripheral vascular conditions that can be treated through thrombectomy and embolization procedures. The Company focuses on developing, manufacturing and marketing products for use by specialist physicians, including interventional neuroradiologists, neurosurgeons, interventional neurologists, interventional radiologists and vascular surgeons. Its neuro products include Neurovascular Access, Ischemic Stroke, Neurovascular Embolization and Neurosurgical Tools. The Company’s peripheral vascular products include Peripheral Embolization and Peripheral Thrombectomy.