Cerebras Systems Inc.

Limitation on Effectiveness of Controls and Procedures

In designing and evaluating our disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on the evaluation of our disclosure controls and procedures, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were not effective at the reasonable assurance level as of June 30, 2026 due to the material weaknesses in our internal control over financial reporting described below.

Previously Reported Material Weaknesses in Internal Control Over Financial Reporting

A material weakness is a deficiency or combination of deficiencies in our internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim consolidated financial statements would not be prevented or detected on a timely basis.

As disclosed in the section titled “Risk Factors” in Part II, Item 1A of this Quarterly Report on Form 10-Q, we previously identified material weaknesses in our internal control over financial reporting related to the lack of effectively designed, implemented, and maintained IT general controls over applications that support our financial reporting processes; insufficient segregation of duties across financially relevant functions, and lack of sufficient number of qualified personnel within our accounting, finance, and operations functions who possessed an appropriate level of expertise to provide reasonable assurance that transactions were being appropriately recorded and disclosed. We have concluded that these material weaknesses existed because we did not have the necessary business processes, systems, personnel and related internal controls pertaining to several financial statement areas, including revenue recognition, inventory management and costing, data center assets accounting, and equity administration. The deficiencies identified did not result in a material misstatement to our financial statements.

Remediation Efforts to Address Previously Identified Material Weaknesses

We have taken and will continue to take action to remediate these material weaknesses, including:

•continued hiring of additional accounting, finance, and operations resources with appropriate and sufficient technical expertise to improve oversight across critical accounting areas;

•designing and implementing controls related to significant accounts and disclosures to achieve complete, accurate and timely financial accounting, reporting and disclosures, including controls over account reconciliations, segregation of duties and the preparation and review of journal entries over significant accounting matters;

•implementing processes and controls to better identify and manage risks, including segregation of duties;

•implementation of IT general controls to manage access and program changes within our IT environment;

•engagement with external consultants with extensive Sarbanes-Oxley Act experience; and

•consulting with experts on technical accounting matters, internal controls, and the preparation of our financial statements.

We believe we are making progress toward achieving effectiveness of our internal control over financial reporting. The actions that we are taking are subject to ongoing management review and audit committee oversight. We will not be able to conclude whether the steps we are taking will fully remediate the material weaknesses in our internal control over financial reporting until we have completed our remediation efforts and subsequently evaluated their design and effectiveness over a sufficient period of time, and management concludes, through testing, that these are operating effectively. We may also conclude that additional measures are required to remediate the material weaknesses in our internal control over financial reporting.

Changes in Internal Control Over Financial Reporting

Except for the remediation measures in connection with the material weaknesses described above, there were no changes in our internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act, that occurred during the three months ended June 30, 2026 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.