Shares of medical equipment maker Penumbra PEN.N rise 12% to $350 premarket.
Boston Scientific BSX.N says it will buy Penumbra in a deal valued at about $14.5 billion.
Boston Scientific fell 5% on the news.
The transaction values each Penumbra share at $374, a premium of 19.3% to the stock's last close.
The deal is expected to be completed later this year.
PEN shares rose 29.6% in 2025.
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