WELLINGTON MANAGEMENT GROUP LLP - 31 Dec 2025 SCHEDULE 13G Report for Financial Institutions, Inc. Common Stock (FISI)

Filing Manager
WELLINGTON MANAGEMENT GROUP LLP
Reporting Manager
Wellington Management Group LLP
Security
Financial Institutions, Inc. Common Stock
Symbol
FISI
Shares outstanding
20,178,750 shares
Disclosed Ownership
1,049,295 shares
Ownership
5.2%
Form type
SCHEDULE 13G
Filing time
10 Feb 2026, 11:17:43 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

Reporting Managers (4)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Wellington Management Group LLP 5.2% 1,049,295 0 1,049,295 Taisia Lowe Regulatory Analyst
Wellington Group Holdings LLP 5.2% 1,049,295 0 1,049,295 Taisia Lowe Regulatory Analyst
Wellington Investment Advisors Holdings LLP 5.2% 1,049,295 0 1,049,295 Taisia Lowe Regulatory Analyst
Wellington Management Company LLP 5.2% 1,049,295 0 1,049,295 Taisia Lowe Regulatory Analyst