Item 9A. CONTROLS AND PROCEDURES.

Evaluation of Disclosure Controls and Procedures

As of December 31, 2019, management carried out an evaluation, under the supervision and with the participation of its chief executive officer and chief financial officer, of the effectiveness of the design and operation of its disclosure controls and procedures as defined in Exchange Act Rules 13a-15(e) and 15d-15(e), as of the end of the period covered by this 2019 Form 10-K. Based on this evaluation, management has concluded that as of December 31, 2019, such disclosure controls and procedures were effective.

Management’s Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of management, including the chief executive officer and chief financial officer, management assessed the effectiveness of internal control over financial reporting as of December 31, 2019 based on the framework in “Internal Control—Integrated Framework” (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on that assessment, management has concluded that the Company’s internal control over financial reporting was effective at December 31, 2019 to provide reasonable assurance regarding the reliability of its financial reporting and the preparation of its financial statements for external purposes in accordance with United States generally accepted accounting principles. Due to its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

We have excluded from the scope of our assessment of internal control over financial reporting the operations and related assets of Celgene Corporation which we acquired on November 20, 2019. At December 31, 2019 and for the period from acquisition through December 31, 2019, total assets and total revenues subject to Celgene's internal control over financial reporting represented 8% and 7% of BMS's consolidated total assets and total revenues as of and for the year ended December 31, 2019. Based on its assessment, BMS management believes that, as of December 31, 2019, the Company's internal control over financial reporting is effective based on those criteria.

Deloitte & Touche LLP, an independent registered public accounting firm, has audited the Company’s financial statements included in this report on this 2019 Form 10-K and issued its report on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2019, which is included herein.

Changes in Internal Control Over Financial Reporting

As of December 31, 2019, management is in the process of evaluating and integrating the internal controls of the acquired Celgene business into the Company's existing operations. Other than the controls enhanced or implemented to integrate the Celgene business, there has been no change in the Company's internal control over financial reporting during the year ended December 31, 2019, that has materially affected, or is reasonably likely to materially affect, the Company's internal control over financial reporting.