SCHEDULE 13D/A

Financial Institutions Inc

Common Stock, $0.01 par value · CUSIP: 317585404

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• PL Capital Advisors, LLCReported CIK 0001569147

  Shares: 1,774,886 · Class: 8.8%

• LASHLEY RICHARD JReported CIK 0001204241

  Shares: 1,785,686 · Class: 8.9%

• PALMER JOHN WReported CIK 0001204244

  Shares: 1,778,886 · Class: 8.8%

• Black Maple Capital Management LPReported CIK 0001588959

  Shares: 31,989 · Class: 0.2%

• Black Maple Capital Holdings LLC

  Shares: 31,989 · Class: 0.2%

• Barnard Robert JamesReported CIK 0001979656

  Shares: 31,989 · Class: 0.2%

• Danielle Morgan Lashley 2010 Trust

  Shares: 3,000 · Class: 0.01%

• Lashley Danielle Morgan

  Shares: 3,000 · Class: 0.01%

• Lashley Family 2011 Trust

  Shares: 5,100 · Class: 0.03%

• Lashley Beth

  Shares: 5,100 · Class: 0.03%

• Lashley Family 2012 Trust

  Shares: 3,000 · Class: 0.01%

• Lashley Robin

  Shares: 1,200 · Class: 0.01%

• Caitlin Anne Lashley 2010 Trust

  Shares: 1,500 · Class: 0.01%

• Fanelli Caitlin (nee Lashley)

  Shares: 1,500 · Class: 0.01%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.