Barington affiliate buys Eastern Co. shares

Eastern Co. insider entities linked to director and 10% owner James A. Mitarotonda reported open-market purchases of the company’s common shares.

Accepted by SEC EDGAR 06/08/2026 - 05:33 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Eastern Co. insider entities linked to director and 10% owner James A. Mitarotonda reported open-market purchases of the company’s common shares. Barington Companies Equity Partners L.P. bought 3,736 shares at $21.7266 per share and 1,922 shares at $21.5769 per share, for a net purchase of 5,658 shares. Following these transactions, one reporting person holds 44,511 common shares directly, while Barington Companies Equity Partners L.P. is shown with indirect holdings of 650,000 and then 646,264 common shares. The reporting persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest.

Insider Trade Summary

Net Buyer: 5,658 shares

Net Buy 2 txns

Insider MITAROTONDA JAMES A, BARINGTON COMPANIES EQUITY PARTNERS L P, BARINGTON COMPANIES MANAGEMENT, LLC

Role Director, 10% Owner | 10% Owner | Insider

Bought 5,658 shs ($123K)

Type	Security	Shares	Price	Value
Purchase	Common Shares	1,922	$21.5769	$41K
Purchase	Common Shares	3,736	$21.7266	$81K
Holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 650,000 shares (Indirect, by Barington Companies Equity Partners L.P.); Common Shares — 44,511 shares (Direct)

Footnotes (2)

1. F1. James A. Mitarotonda is the sole stockholder and director of LNA Capital Corp. LNA Capital Corp. is the general partner of Barington Capital Group, L.P., which is the majority member of Barington Companies Investors, LLC ("Barington Investors"). Barington Investors is the general partner of Barington Companies Equity Partners L.P. Barington Companies Management, LLC is the investment adviser to Barington Companies Equity Partners L.P.
2. F2. Each of the reporting persons disclaims beneficial ownership of these securities, except to the extent of the pecuniary interests therein, and this report shall not be deemed to be an admission that each of the reporting persons is the beneficial owner of these shares for the purposes of Section 16 or any other purpose.

Key Figures

Open-market purchase 1: 3,736 shares at $21.7266 Open-market purchase 2: 1,922 shares at $21.5769 Net shares bought: 5,658 shares +3 more

6 metrics

Open-market purchase 1 3,736 shares at $21.7266 Common shares bought by Barington Companies Equity Partners L.P.

Open-market purchase 2 1,922 shares at $21.5769 Common shares bought by Barington Companies Equity Partners L.P.

Net shares bought 5,658 shares Total net buy across reported open-market purchases

Direct holdings 44,511 shares Common shares held directly by a reporting person after transactions

Indirect holdings (line 1) 650,000 shares Common shares indirectly held by Barington Companies Equity Partners L.P.

Indirect holdings (line 2) 646,264 shares Common shares indirectly held by Barington Companies Equity Partners L.P.

Key Terms

open-market purchase, beneficial ownership, investment adviser, pecuniary interests, +1 more

5 terms

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

beneficial ownership financial

"disclaims beneficial ownership of these securities, except to the extent"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

investment adviser financial

"Barington Companies Management, LLC is the investment adviser"

An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.

pecuniary interests financial

"except to the extent of the pecuniary interests therein"

indirect ownership financial

"ownership_type: indirect, nature_of_ownership: by Barington Companies Equity Partners L.P."

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MITAROTONDA JAMES A

(Last) (First) (Middle)

888 SEVENTH AVENUE 6TH FL

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
EASTERN CO [ EML ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	06/04/2026		P		1,922	A	$21.5769	646,264	I	by Barington Companies Equity Partners L.P.(1)(2)
Common Shares	06/05/2026		P		3,736	A	$21.7266	650,000	I	by Barington Companies Equity Partners L.P.(1)(2)
Common Shares								44,511	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

MITAROTONDA JAMES A

(Last) (First) (Middle)

888 SEVENTH AVENUE 6TH FL

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

BARINGTON COMPANIES EQUITY PARTNERS L P

(Last) (First) (Middle)

88 SEVENTH AVENUE 6TH FL

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

BARINGTON COMPANIES MANAGEMENT, LLC

(Last) (First) (Middle)

88 SEVENTH AVENUE 6TH FL

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Investment Adviser

Explanation of Responses:

1. James A. Mitarotonda is the sole stockholder and director of LNA Capital Corp. LNA Capital Corp. is the general partner of Barington Capital Group, L.P., which is the majority member of Barington Companies Investors, LLC ("Barington Investors"). Barington Investors is the general partner of Barington Companies Equity Partners L.P. Barington Companies Management, LLC is the investment adviser to Barington Companies Equity Partners L.P.

2. Each of the reporting persons disclaims beneficial ownership of these securities, except to the extent of the pecuniary interests therein, and this report shall not be deemed to be an admission that each of the reporting persons is the beneficial owner of these shares for the purposes of Section 16 or any other purpose.

	/s/James A. Mitarotonda	06/08/2026
	/s/ Barington Companies Equity Partners LP	06/08/2026
	/s/ Barington Companies Management, LLC	06/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)