Vanguard Capital Management (EOSE) reports 5.07% stake in Eos Energy

Rhea-AI Filing Summary

Eos Energy Enterprises Inc ownership filing shows Vanguard Capital Management reports beneficial ownership of 17,239,505 shares of Common Stock, representing 5.07% of the class. The filing states Vanguard has sole dispositive power over 17,239,505 shares and sole voting power for 2,404,068 shares. The filing is signed on 04/29/2026 and cites aggregated holdings across Vanguard business units per SEC Release No. 34-39538.

Insights

Institutional Ownership Analyst

Vanguard reports a passive >5% stake in Eos Energy Enterprises

Vanguard Capital Management discloses beneficial ownership of 17,239,505 shares (5.07%). The filing attributes voting and dispositive powers across Vanguard business units consistent with issuer-aggregated reporting under Release No. 34-39538.

Holdings above 5.07% trigger public disclosure obligations; subsequent Form 13D/4 or schedule updates would be required only if ownership or intent changes. Timing and trading intentions are not stated in the excerpt.

Key Figures

Beneficial ownership: 17,239,505 shares Percent of class: 5.07% Sole voting power: 2,404,068 shares +2 more

5 metrics

Beneficial ownership 17,239,505 shares Reported beneficially owned amount

Percent of class 5.07% Percent of common stock class

Sole voting power 2,404,068 shares Shares over which Vanguard has sole power to vote

Filing signature date 04/29/2026 Signed date in the filing

CUSIP 29415C101 Identifier for Eos Energy Common Stock

Key Terms

Schedule 13G, Beneficial ownership, Dispositive power, Sole voting power

4 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: Eos Energy Enterprises Inc"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficial ownership financial

"Item 4. (a) Amount beneficially owned: 17239505"

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.

Dispositive power regulatory

"Item 4. (iii) Sole power to dispose or to direct the disposition of: 17239505"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Sole voting power regulatory

"Item 4. (i) Sole power to vote or to direct the vote: 2404068"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Eos Energy Enterprises Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

29415C101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 29415C101

1

Names of Reporting Persons

Vanguard Capital Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,404,068.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 17,239,505.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

17,239,505.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.07 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Eos Energy Enterprises Inc
(b)	Address of issuer's principal executive offices: 3920 Park Avenue, Edison, NJ, 08820
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 29415C101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 17239505
(b)	Percent of class: 5.07 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2404068
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 17239505
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/29/2026

FAQ

What stake does Vanguard Capital Management report in EOSE?

Vanguard reports beneficial ownership of 17,239,505 shares, equal to 5.07% of the outstanding Class. This position is reported under Schedule 13G and aggregates holdings across Vanguard business units per the filing.

How much voting power does Vanguard have in Eos Energy (EOSE)?

The filing states Vanguard has sole voting power for 2,404,068 shares. It also reports sole dispositive power for 17,239,505 shares, indicating control over sale decisions for that full amount.

Does this Schedule 13G indicate Vanguard intends to influence EOSE management?

No intent to influence is specified in the excerpt. Schedule 13G filers typically report a passive stake; the filing here lists aggregated holdings but does not state activist intent or plans to change control.

When was the Vanguard 13G for EOSE signed?

The signature block shows the filing was signed on 04/29/2026 by Ashley Grim, Head of Global Fund Administration. The cover includes the reported share counts as of 03/31/2026 context for the issuer class.

Who is included in Vanguard's aggregated ownership disclosure?

The filing states the holdings reflect securities beneficially owned or deemed beneficially owned by Vanguard Capital Management LLC and affiliates, including Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd.