{"url_path":"/sec/cycn/10-q/2026/item-4","section_key":"item-4","section_title":"Item 4 Controls and Procedures.","topic":"sec","document":{"doc_type":"10-Q","doc_date":"2026-05-12","source_url":"https://www.sec.gov/Archives/edgar/data/1755237/0001193125-26-219478-index.html","accession_number":"0001193125-26-219478","cik":"0001755237","ticker":"CYCN","issuer_name":"Korsana Biosciences, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1755237/0001193125-26-219478-index.html","primary_entity_key":"0001755237","primary_entity_name":"Cyclerion Therapeutics, Inc."},"word_count":415,"has_tables":true,"body_markdown":"Item 4. Controls and Procedures.\n\nEvaluation of Disclosure Controls and Procedures\n\nThe term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act refers to controls and procedures that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. Because there are inherent limitations in all control systems, a control system, no matter how well conceived and operated, can provide only reasonable, as opposed to absolute, assurance that the objectives of the control system are met. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective, at the reasonable assurance level, as of the end of the\n\n \n\n32\n\n \n\nperiod covered by this report. However, our management does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud.\n\nChanges in Internal Control over Financial Reporting\n\nThere 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 period covered by this Quarterly Report on Form 10-Q which have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.\n\n \n\n33\n\n \n\nPART II"}