SCHEDULE 13D/A

EASTERN CO

Common Stock, no par value · CUSIP: 276317104

Event date: 2026-03-16

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

• Barington Companies Equity Partners, L.P.Reported CIK 0001107149

  Shares: 642,342.00 · Class: 10.6%

• Barington Companies Investors, LLCReported CIK 0001324904

  Shares: 642,342.00 · Class: 10.6%

• Barington Companies Management, LLCReported CIK 0000887762

  Shares: 642,342.00 · Class: 10.6%

• Barington Capital Group, L.P.Reported CIK 0000880915

  Shares: 642,342.00 · Class: 10.6%

• LNA Capital Corp.Reported CIK 0001324903

  Shares: 642,342.00 · Class: 10.6%

• James A. MitarotondaReported CIK 0001254583

  Shares: 686,853.00 · Class: 11.4%

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