8-K: Cambium Networks Changes Auditor Amid Financial Restatement

Cambium Networks Corporation has dismissed Grant Thornton LLP and engaged BDO USA, PC as its new independent registered public accounting firm, following multiple material weaknesses and a decision to restate prior financial statements.

Summary

• Cambium Networks Corporation's Audit Committee dismissed Grant Thornton LLP as its independent registered public accounting firm on November 26, 2025.
• Grant Thornton LLP was initially engaged on April 5, 2024, and had not issued an audit report on the company's consolidated financial statements for any period.
• The dismissal follows the company's disclosure of multiple material weaknesses in internal controls over financial reporting.
• These material weaknesses include issues with inventory excess and obsolescence reserve, recoverability of deferred tax assets, insufficient technical accounting expertise, Allowance for Credit Losses, Customer Incentives, and Information Technology General Controls.
• The company previously determined that its financial statements for fiscal years ended December 31, 2022, and December 31, 2023, and interim periods in 2023 and 2024, should be restated due to errors primarily related to variable consideration (sales returns and customer rebates) under ASC 606.
• The company has been delayed in filing its Annual Report on Form 10-K for the year ended December 31, 2024, and Quarterly Reports on Form 10-Q for the periods ended March 31, 2025, June 30, 2025, and September 30, 2025.
• The Audit Committee approved the engagement of BDO USA, PC as the new independent registered public accounting firm, effective immediately, to perform audit services for the 2023 (restated), 2024, and 2025 fiscal periods.
• The company cited inefficiency and coordination difficulties of working with two different independent registered public accounting firms as a reason for appointing BDO to handle the restated period and future audits.

Sentiment

Score: 2

Explanation: The sentiment is highly negative due to the dismissal of an auditor, multiple severe material weaknesses in internal controls, the necessity to restate past financial statements, and significant delays in regulatory filings. These issues collectively point to substantial financial reporting and governance challenges.

Positives

• No disagreements on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure were reported between the company and Grant Thornton LLP.
• Grant Thornton LLP has confirmed its agreement with the statements made by the company in the 8-K filing regarding its dismissal.
• The engagement of a single firm, BDO USA, PC, for restatement and future audits is expected to improve efficiency and coordination.

Negatives

• The company has identified multiple material weaknesses in its internal controls over financial reporting, indicating significant deficiencies in financial reporting processes.
• Previously issued financial statements for fiscal years 2022 and 2023, and several interim periods in 2023 and 2024, require restatement due to accounting errors.
• The company has experienced significant delays in filing its Annual Report on Form 10-K for 2024 and Quarterly Reports on Form 10-Q for Q1, Q2, and Q3 2025.
• The dismissal of an auditor, especially one engaged relatively recently (April 2024), often signals underlying issues and can raise investor concerns.

Risks

• Ongoing material weaknesses in internal controls over financial reporting pose a risk to the accuracy and reliability of future financial statements.
• The need for restatement of past financial statements could lead to a loss of investor confidence and potential legal or regulatory scrutiny.
• Continued delays in filing required financial reports could result in delisting from Nasdaq or other penalties.
• The complexity of restating prior periods and auditing current periods simultaneously with a new firm could lead to further delays or unforeseen challenges.
• The identified issues related to variable consideration (sales returns, customer rebates) under ASC 606 suggest potential revenue recognition risks.

Future Outlook

BDO USA, PC has been engaged to perform audit services for the company's 2023 (restated), 2024, and 2025 fiscal periods. This indicates a path forward for resolving the financial reporting issues and bringing the company's filings up to date.

Management Comments

• The company decided that working with two different independent registered public accounting firms is inefficient and difficult to coordinate, leading to the appointment of BDO USA, PC to perform audit services for the restated period and for the year ended December 31, 2024.

Industry Context

Changes in independent auditors, especially when accompanied by material weaknesses in internal controls and financial restatements, are significant events that typically raise concerns among investors and analysts. Such events can signal deeper operational or governance issues within a company, potentially impacting its standing relative to industry peers who maintain robust financial reporting and internal control environments.

Comparison to Industry Standards

• The disclosure of multiple material weaknesses in internal controls over financial reporting, including issues with inventory, deferred tax assets, technical accounting expertise, credit losses, customer incentives, and IT general controls, falls significantly below industry best practices for financial integrity and transparency.
• The necessity to restate financial statements for two full fiscal years (2022, 2023) and multiple interim periods due to errors in revenue recognition (ASC 606, variable consideration) is a severe deviation from the expected accuracy and reliability of financial reporting in publicly traded companies.
• The prolonged delays in filing annual and quarterly reports (2024 10-K, Q1, Q2, Q3 2025 10-Qs) indicate a breakdown in the company's ability to meet regulatory compliance deadlines, which is a critical standard for all publicly listed entities, unlike well-managed peers such as Cisco Systems or Juniper Networks who consistently meet reporting obligations.

Corporate Governance

Stakeholder Impact

• Shareholders face significant uncertainty and potential erosion of confidence due to unreliable past financial statements, ongoing internal control weaknesses, and delayed regulatory filings.
• Employees may experience increased pressure and scrutiny as the company works to rectify its financial reporting issues.
• Creditors and investors may reassess the company's financial health and risk profile, potentially impacting access to capital or borrowing costs.

Next Steps

• BDO USA, PC will perform audit services for the company's restated consolidated financial statements for the fiscal year ended December 31, 2023.
• BDO USA, PC will perform audit services for the company's financial statements as of and for the fiscal years ended December 31, 2024 and 2025.

Key Dates

Recommendation

The filing reveals a company in significant distress regarding its financial reporting and internal controls. The dismissal of an auditor, coupled with multiple material weaknesses, the necessity to restate two years of financials, and persistent delays in filing, indicates a severe lack of financial transparency and operational integrity. These issues create substantial uncertainty and risk for investors, making the company's financial statements unreliable. Until these fundamental issues are demonstrably resolved and a track record of accurate and timely reporting is re-established, the stock carries a very high risk profile, warranting a strong sell recommendation.

Keywords

Cambium Networks, CMBM, auditor change, financial restatement, material weakness, internal controls, SEC filing, 8-K, Grant Thornton, BDO, delayed filings, corporate governance, accounting errors