Wellington Management Group LLP Increases Stake in AAON, Inc. to 9.8%

Wellington Management Group LLP, along with its affiliated holding companies and investment advisers, filed a Schedule 13G/A on May 15, 2026, disclosing a significant ownership stake in AAON, Inc. As of the event date on March 31, 2026, the reporting entities collectively beneficially own 7,977,164 shares of AAON's common stock, representing 9.8% of the company. This filing marks a substantial increase from a previously reported 0.0% position. The shares are held of record by various clients of the investment advisers, including Wellington Management Company LLP, which reported a direct interest in 8.5% of the shares. The filing indicates that the securities were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. The reporting group includes Wellington Group Holdings LLP, Wellington Investment Advisors Holdings LLP, and Wellington Management Company LLP, all operating under a joint filing agreement to comply with SEC beneficial ownership reporting requirements.