raw_text: Based on that evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that these disclosure controls and procedures are effective.

section: Item 9A. Controls and Procedures

status: present

value: effective

raw_text: Based on this evaluation, management concluded that the Company’s internal control over financial reporting was effective as of June 30, 2025.

reason: No current material weakness is disclosed

split: train


raw_text: Based on this evaluation, our chief executive officer and chief financial officer concluded that, as of December 31, 2025 , our disclosure controls and procedures are designed at a reasonable assurance level and are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our chief executive officer and chief financial officer, as appropriate, to allow timely decisions regarding required disclosure.

raw_text: Based on this evaluation, management concluded that our internal control over financial reporting was effective as of December 31, 2025.


raw_text: Based on their evaluation as of January 25, 2026, our management, including our Chief Executive Officer and Chief Financial Officer, has concluded that our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) were effective to provide reasonable assurance that the information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and our Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures.

raw_text: , our management concluded that our internal control over financial reporting was effective as of January 25, 2026.


raw_text: Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that due to the material weaknesses in our internal control over financial reporting described below, our disclosure controls and procedures were not effective as of December 31, 2025.

value: ineffective

raw_text: Because of these material weaknesses, management has concluded that Adtran did not maintain effective internal control over financial reporting as of December 31, 2025.

raw_text: Following the identification of the material weaknesses and continuing throughout the year ended December 31, 2025, management executed its remediation plan through the following actions:

value: ongoing


raw_text: Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that as of December 31, 2025, our disclosure controls and procedures were not effective because of a material weakness in our internal control over financial reporting, as further described below.

raw_text: Based on evaluation under these criteria, management determined, based upon the existence of the material weakness described below, that we did not maintain effective internal control over financial reporting as of December 31, 2025.

raw_text: We identified a material weakness associated with the sufficiency of resources.

raw_text: Of the three material weaknesses identified for the fiscal year ended December 31, 2024, our management remediated two, with the third material weakness remaining unremediated as of December 31, 2025 as further described below.


raw_text: Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were not effective as of December 31, 2025 because of the material weaknesses in internal controls over financial reporting described below.

raw_text: Based on this assessment, management has concluded, based on the existence of the material weaknesses described below, that we did not maintain effective internal control over financial reporting.

raw_text: As we continue to evaluate and work to remediate the control deficiencies that gave rise to the material weaknesses, we may determine that additional measures or time are required to address the control deficiencies or that we need to modify or otherwise adjust the remediation measures described above.


raw_text: Based on an evaluation under the supervision and with the participation of the Company’s management, the Company’s principal executive officer and principal financial officer have concluded that the Company’s disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act were effective as of March 28, 2026 to provide reasonable assurance that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and (ii) accumulated and communicated to the Company’s management, including its principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

section: Part I, Item 4. Controls and Procedures

reason: No explicit current-period management conclusion on ICFR effectiveness

status: abstained

reason: No affirmative, explicit-negative, or effective-ICFR evidence

reason: Material-weakness status is unresolved


raw_text: Jejurikar and Schulten have concluded that the Company’s disclosure controls and procedures were effective to ensure that information required to be disclosed in reports we file or submit under the Exchange Act is (1) recorded, processed, summarized and reported within the time periods specified in SEC rules and forms, and (2) accumulated and communicated to our management, including Messrs.


raw_text: Based on this evaluation, our principal executive officer and principal financial officer concluded that, as of December 31, 2025, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the 1934 Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

raw_text: As a result of this assessment, management concluded that, as of December 31, 2025, our internal control over financial reporting was effective in providing reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.

split: validation


raw_text: Due to the material weaknesses described below, our Chief Executive Officer and our Chief Financial Officer concluded that the Company’s disclosure controls and procedures were not effective at the reasonable assurance level as of December 31, 2025.

raw_text: Under the supervision and with the participation of our management, including our Chief Executive Officer and our Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2025. Based on this evaluation, management concluded that our internal control over financial reporting was not effective as of December 31, 2025 due to the material weaknesses described below.

raw_text: While the material weaknesses have not been remediated as of December 31, 2025, management is devoting substantial resources to the ongoing remediation efforts and is targeting remediation by the end of the fiscal year ending December 31, 2026.


raw_text: Based on such evaluation, our CEO and CFO have concluded that as of December 31, 2025, our disclosure controls and procedures are designed at a reasonable assurance level and are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission, and that such information is accumulated and communicated to our management, including our CEO and CFO, as appropriate, to allow timely decisions regarding required disclosure.

raw_text: Based on the assessment, management has concluded that its internal control over financial reporting was effective as of December 31, 2025 to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with U.S.

split: test


raw_text: Based on that evaluation, our principal executive officer and principal financial officer concluded that, as of December 31, 2025, our disclosure controls and procedures were not effective at the reasonable assurance level as a result of the material weaknesses in our internal control over financial reporting described below.

raw_text: Based on this evaluation, management concluded that our internal control over financial reporting was not effective as of December 31, 2025 as a result of the material weaknesses in our internal control over financial reporting described below.

raw_text: As previously disclosed in Item 9A of our Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC on March 12, 2025, we identified material weaknesses in internal control over financial reporting related to the risk assessment, information and communication components of the COSO Framework and related to establishing policies and procedures for financial reporting.

raw_text: While the material weaknesses have not been remediated as of December 31, 2025, management is devoting substantial resources to the ongoing remediation efforts.