SCHEDULE 13G/A

EASTERN CO

Common Stock, No par value · CUSIP: 276317104

Event date: 2025-12-31

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

• Minerva Advisors LLC

  Shares: 529,084 · Class: 8.7%

• Minerva Group LP

  Shares: 337,419 · Class: 5.6%

• Minerva GP, LP

  Shares: 337,419 · Class: 5.6%

• Minerva GP, Inc.

  Shares: 337,419 · Class: 5.6%

• David P. Cohen

  Shares: 531,334 · Class: 8.8%

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