Results of Operations and Financial Condition. On July 30, 2026, Penumbra, Inc. issued a press release announcing financial results for the second fiscal quarter ended June 30, 2026. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act o…

Results of Operations and Financial Condition. On May 6, 2026, Penumbra, Inc. issued a press release announcing financial results for the first fiscal quarter ended March 31, 2026. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of…

Results of Operations and Financial Condition. On February 25, 2026 , Penumbra, Inc. issued a press release announcing financial results for the fourth fiscal quarter and year ended December 31, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securit…

Results of Operations and Financial Condition. On January 15, 2026, the Company issued a press release announcing certain preliminary financial results for the fiscal quarter and year ended December 31, 2025, a copy of which is attached as Exhibit 99.1 to this Report and is incorporated herein by reference. The Company’s audited financial statements for the year ended December 31, 2025 are not yet available. Accordingly, these preliminary financial results are an estimate and subject to the c…

Entry Into a Material Definitive Agreement. Agreement and Plan of Merger On January 14, 2026, Penumbra, Inc., a Delaware corporation (the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) among the Company, Boston Scientific Corporation, a Delaware corporation (“Parent”), and Pinehurst Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Merger Sub”), pursuant to which Merger Sub will merge with and into the Company (the “Merger”),…

Results of Operations and Financial Condition. On November 5, 2025, Penumbra, Inc. issued a press release announcing financial results for the third fiscal quarter ended September 30, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchang…

President — Shruthi Narayan: The filing discloses the internal promotion of a long-tenured employee to President, with the CEO retaining their role, indicating an orderly succession rather than a departure.

Results of Operations and Financial Condition. On July 29, 2025, Penumbra, Inc. issued a press release announcing financial results for the second fiscal quarter ended June 30, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act o…

Results of Operations and Financial Condition. On April 23, 2025, Penumbra, Inc. issued a press release announcing financial results for the first fiscal quarter ended March 31, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act…

Director — Don Kassing: The filing discloses the scheduled retirement of a board director without any disagreement or immediate operational impact, which is a routine governance event.

Results of Operations and Financial Condition. On February 18, 2025, Penumbra, Inc. issued a press release announcing financial results for the fourth fiscal quarter and year ended December 31, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securiti…

Results of Operations and Financial Condition. On October 30, 2024, Penumbra, Inc. issued a press release announcing financial results for the third fiscal quarter ended September 30, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchang…

Other Events. On August 13, 2024, Penumbra, Inc. issued a press release announcing its entry into an accelerated share repurchase agreement. A copy of the press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Results of Operations and Financial Condition. On July 30, 2024, Penumbra, Inc. issued a press release announcing financial results for the second fiscal quarter ended June 30, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act o…

Results of Operations and Financial Condition. On May 7, 2024, Penumbra, Inc. issued a press release announcing financial results for the first fiscal quarter ended March 31, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished on this Current Report on Form 8-K, including the attached exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of…

Changes in Registrant’s Certifying Accountant. The Audit Committee of the Board of Directors (the “Audit Committee”) of Penumbra, Inc. (the “Company”) has completed a process to review the appointment of the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2024. As a result of this process, on March 17, 2024, the Company, with the approval of the Audit Committee, appointed PricewaterhouseCoopers LLP (“PwC”) as the Company’s independent registered…