Insulet Corporation Announces Change in Independent Auditor: Grant Thornton LLP Dismissed, PwC Appointed

Key Points for Investors

• Insulet Corporation (NASDAQ: PODD) files an amended 8-K/A announcing a significant change in its independent registered public accounting firm.
• Grant Thornton LLP (“GT”) has completed its audit services for the fiscal year ended December 31, 2025, and has been dismissed as auditor effective February 18, 2026.
• PricewaterhouseCoopers LLP (“PwC”) has been selected as the new independent registered public accounting firm for the fiscal year ending December 31, 2026.
• No disagreements or reportable events between Insulet and Grant Thornton during their engagement period.
• Grant Thornton’s reports for 2025 and 2024 contained no adverse opinions, disclaimers, or qualifications.
• Grant Thornton confirmed its agreement with Insulet’s disclosures by letter to the SEC, filed as Exhibit 16.1.

Detailed Analysis

Insulet Corporation, a leading provider of medical devices, has officially announced through an amended 8-K/A filing a change in its independent auditor. This is a move that investors and shareholders should carefully note, as changes in auditors can sometimes be perceived as a governance or financial reporting risk, or alternatively, as a sign of the company maturing and seeking higher audit standards.

Background and Timeline

• On December 15, 2025, the Audit Committee of Insulet’s Board of Directors notified Grant Thornton LLP of its decision to appoint PricewaterhouseCoopers LLP as the next independent registered public accounting firm for the company’s fiscal year ending December 31, 2026.
• Grant Thornton was retained to audit the company’s consolidated financial statements for the year ended December 31, 2025, and remained engaged until the completion of their audit services on February 18, 2026. The official dismissal was effective on that date.
• This filing, submitted on February 24, 2026, serves as an amendment to the earlier 8-K, providing updated disclosures as required by SEC Regulation S-K Item 304.

Implications for Shareholders

• No Unresolved Disagreements: According to the filing, there were no disagreements between Insulet and Grant Thornton on accounting principles, financial statement disclosures, or audit scope that would have led Grant Thornton to reference any such issues in their reports. There were also no “reportable events” as defined by SEC rules.
• Clean Audit Opinions: Grant Thornton’s audit reports for fiscal years 2025 and 2024 did not include any adverse opinions, disclaimers, or modifications as to uncertainty, audit scope, or accounting principles. This is an important signal of stability and reliability in Insulet’s financial reporting for those periods.
• Confirmation by Outgoing Auditor: Grant Thornton has provided a formal letter to the SEC, agreeing with Insulet’s statements regarding their dismissal and lack of disagreements, further reducing any concerns about hidden disputes or audit issues.
• No Consultations with New Auditor Prior to Appointment: During the relevant period, neither Insulet nor anyone on its behalf consulted with PwC regarding the application of accounting principles to specified transactions, audit opinions, or any potential disagreements or reportable events. This indicates a standard, clean transition process.

Potential Impact on Share Value

This change in auditor may be viewed as a noteworthy event for several reasons:

• Auditor changes can be interpreted by the market as a sign of significant shifts in corporate governance, company growth, or, in rare cases, underlying issues with financial controls or reporting. However, in this instance, the absence of any reportable controversy, clean opinions for prior years, and transparent communication mitigate most negative interpretations.
• Selection of a “Big Four” firm like PwC may be viewed positively, signaling Insulet’s growth and its commitment to higher audit standards.
• Investors should watch for any future updates regarding the transition or the first annual report audited by PwC, as this is when new auditors sometimes identify legacy issues or recommend substantive changes to reporting practices.

Exhibits and Supporting Documents

• Exhibit 16.1: Letter from Grant Thornton LLP to the SEC, dated February 24, 2026, confirming agreement with Insulet’s disclosures.
• Exhibit 104: Cover Page Interactive Data File (embedded within the Inline XBRL document).

Conclusion

In summary, Insulet Corporation’s transition from Grant Thornton LLP to PricewaterhouseCoopers LLP as its independent registered public accounting firm appears to be a standard and well-communicated process, free of any adverse or controversial circumstances. The market will likely view this as a non-problematic, potentially positive development given PwC’s reputation. Shareholders are advised, however, to monitor the upcoming 2026 audited financials, as new auditors may bring new perspectives or suggestions.

Disclaimer: This article is for informational purposes only and does not constitute investment advice. Investors should perform their own due diligence and consult professional advisors before making investment decisions. The information is based on Insulet Corporation’s SEC filings and is believed to be accurate as of the date of publication, but no representation or warranty is made as to its accuracy or completeness. The author and publisher assume no liability for any losses arising from reliance on this information.

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