Why Penumbra (PEN) Shares Are Rising Today

Recent Developments

Penumbra (NYSE:PEN), a company specializing in medical devices, saw its stock surge by 12.1% during the afternoon trading session following news that Boston Scientific plans to acquire it in a transaction valued around $14.5 billion.

The agreement places Penumbra’s value at $374 per share, representing a roughly 19.3% premium over its previous closing price. Shareholders of Penumbra can choose to receive either cash or Boston Scientific shares as part of the deal. This acquisition is set to strengthen Boston Scientific’s cardiovascular device offerings by incorporating Penumbra’s blood clot removal technologies. Alongside the acquisition announcement, Penumbra also shared robust preliminary financial projections for 2025, forecasting annual revenue growth between 17.3% and 17.5% compared to 2024.

Market Reaction and Performance

Penumbra’s stock has experienced considerable volatility, with 11 instances of price swings exceeding 5% over the past year. However, a jump of this magnitude is unusual for the company and highlights the significant impact of the acquisition news on investor sentiment.

One of the most notable surges occurred two months ago, when Penumbra’s shares climbed 17.2% after the company reported third-quarter 2025 results that surpassed analyst expectations for both revenue and earnings.

During that quarter, Penumbra’s revenue increased by 17.8% year-over-year to $354.7 million, well above the consensus estimate of $340.4 million. The company’s adjusted earnings per share reached $0.97, exceeding forecasts by 5.3%. Operational efficiency also improved, with the operating margin rising to 13.8% from 11.7% in the prior year’s comparable quarter. This strong performance, marked by robust demand and improved profitability, was well received by investors.

Since the start of the year, Penumbra’s stock has gained 13.6%, reaching a new 52-week high at $351.44 per share. An initial $1,000 investment in Penumbra five years ago would now be valued at $1,538.