Wellington Management Group LLP Reports 4.59% Stake in Financial Institutions, Inc. (FISI)

On May 15, 2026, Wellington Management Group LLP, alongside its affiliates Wellington Group Holdings LLP and Wellington Investment Advisors Holdings LLP, filed a Schedule 13G/A regarding their holdings in Financial Institutions, Inc. (FISI). The filing reports that the group beneficially owns 900,493 shares of common stock, representing a 4.59% ownership stake in the company. This reflects a significant increase from a previous 0.0% position. The shares are held of record by various investment advisers under the Wellington umbrella, including Wellington Management Company LLP, on behalf of their clients. The filing indicates that the securities were acquired in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. Wellington Management Group LLP operates as a parent holding company, with shared voting and dispositive power over the reported shares. The event triggering this specific amendment occurred on March 31, 2026.