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Eos Energy Enterprises (EOSE) Institutional Ownership & Insider Trading History

Q: Who are the largest EOSE shareholders?

Blackrock Inc. is the largest reported institutional holder of EOSE, with 27.13 million shares, or about 7.45% of shares outstanding.

Q: What does the institutional filing activity show for EOSE?

Eos Energy Enterprises has 10 institutional rows on file: 8 increased or initiated positions and 2 reduced them.

Q: What insider transactions are available for EOSE?

TECHi shows 100 dated EOSE insider transactions through Sep 16, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Q: Are EOSE insiders buying or selling?

The displayed EOSE activity reads Mixed, sale-heavy: 32 sales and 5 purchases. Other transaction types remain separate.

Q: Who is the most active reported EOSE insider?

MASTRANGELO JOE has the largest absolute share movement in the displayed EOSE filing rows, totaling 3.64 million shares. The action labels provide the transaction context.

Top EOSE institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.

Section freshness

Prices as of Sep 25, 4:00 PM EDT · Fundamentals checked Sep 26, 10:01 PM EDT · Statements Jun 30, 2026

EOSE

Market closedLatest regular-session print

$3.17

▼ -$0.0800(-2.47%)4:00 PM ET - vs previous close

Quote as of Sep 25, 2026, 4:00 PM EDT

US market market is closed. Showing the latest available regular-session trade from Sep 25, 2026, 4:00 PM EDT.

52w high$19.86

52w low$3.01

Yahoo Finance · latest regular-session print · as of Sep 25, 2026, 4:00 PM EDT · delay not stated · current source

Today3%

$3.16L Sep 25 '26$3.33H Sep 25 '26

Ownership read

EOSE insider transaction activity: Mixed, sale-heavy.

Blackrock Inc. is the largest institutional holder. 32 sales and 5 purchases appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.

Review insider trades View institutions

Insider flow

EOSE

Purchases130.15K

Sales3.03M

Directional bars ignore awards, gifts, conversions, and tax withholding rows.

Top holder

27.13M

Blackrock Inc.

Insider transaction activity

Mixed, sale-heavy

$25.88M sold / $751.66K bought

Filings shown

110

10 holder / 100 insider

Holder rows: 10; Yahoo Finance · delayed, minutes not stated · as of 2026-09-25 20:00 · delay not stated · current source

Increased / initiated: 8; 2 decreased

Insider rows: 100; Yahoo Finance · delayed, minutes not stated · as of 2026-09-25 20:00 · delay not stated · current source

Ownership concentration and transaction activity

Top 10 reported holders: 33.74% outstanding
Reported position changes: Prior-position data unavailable
New / exited positions: 0 / 0 explicitly reported
Largest reported increase: No increase reported

Reported-holder cohort only; absence from a limited provider list does not establish an exit. Changes are provider-reported and are only comparable quarter over quarter when the position periods match.

Net shares sold: 2,898,076

Sale-code S shares minus purchase-code P shares in this sample. Includes disclosed plans and unknown plan status; excludes grants, gifts, exercises and withholding. This is activity, not sentiment.

Purchase / sale; plan unknown: 37
Other / unclassified: 43
Conversion / exercise: 17
Grant: 1
Gift: 2

Top 10 institutional holders

Eos Energy Enterprises (EOSE) institutional ownership

Ranked by reported share count, with position changes and separate position and filing dates where ownership data supplies them.

Blackrock Inc.

Rank #1

7.45%

Shares: 27.13M
Change %: +12.65%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Vanguard Capital Management LLC

Rank #2

4.12%

Shares: 15.02M
Change %: +1.25%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Hudson Bay Capital Management Lp

Rank #3

3.76%

Shares: 13.68M
Change %: +100.00%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Driehaus Capital Management, LLC

Rank #4

3.72%

Shares: 13.56M
Change %: -8.83%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Decreased

Two Sigma Investments, LP

Rank #5

3.51%

Shares: 12.78M
Change %: -9.17%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Decreased

State Street Corporation

Rank #6

2.79%

Shares: 10.15M
Change %: +26.65%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Susquehanna International Group, LLP

Rank #7

2.66%

Shares: 9.68M
Change %: +52.48%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Geode Capital Management, LLC

Rank #8

2.44%

Shares: 8.89M
Change %: +13.85%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Electron Capital Partners, LLC

Rank #9

1.83%

Shares: 6.68M
Change %: +24.21%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Morgan Stanley

Rank #10

1.46%

Shares: 5.31M
Change %: +79.47%
Position / filing: Position as of Jun 30, 2026Filing date unknown

Increased

Eos Energy Enterprises (EOSE) institutional ownership
#	Institution	% held	Shares	Change %	Position / filing date
1	Blackrock Inc.	7.45%	27.13M	+12.65%	Position as of Jun 30, 2026Filing date unknown
2	Vanguard Capital Management LLC	4.12%	15.02M	+1.25%	Position as of Jun 30, 2026Filing date unknown
3	Hudson Bay Capital Management Lp	3.76%	13.68M	+100.00%	Position as of Jun 30, 2026Filing date unknown
4	Driehaus Capital Management, LLC	3.72%	13.56M	-8.83%	Position as of Jun 30, 2026Filing date unknown
5	Two Sigma Investments, LP	3.51%	12.78M	-9.17%	Position as of Jun 30, 2026Filing date unknown
6	State Street Corporation	2.79%	10.15M	+26.65%	Position as of Jun 30, 2026Filing date unknown
7	Susquehanna International Group, LLP	2.66%	9.68M	+52.48%	Position as of Jun 30, 2026Filing date unknown
8	Geode Capital Management, LLC	2.44%	8.89M	+13.85%	Position as of Jun 30, 2026Filing date unknown
9	Electron Capital Partners, LLC	1.83%	6.68M	+24.21%	Position as of Jun 30, 2026Filing date unknown
10	Morgan Stanley	1.46%	5.31M	+79.47%	Position as of Jun 30, 2026Filing date unknown

Showing 10 of 10 matching institutional rows.

Recent insider transactions

Eos Energy Enterprises (EOSE) Form 4 filings

Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.

MASTRANGELO JOE

Chief Executive Officer

Sale

Shares: 250.00K
% company: 0.07%
Price: $3.92
Value: $980,000

Transaction Sep 16, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

PURI SUMEET

Officer

Sale

Shares: 43.75K
% company: 0.01%
Price: $3.92
Value: $171,500

Transaction Sep 16, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

MASTRANGELO JOE

Chief Executive Officer

Other

Shares: 500.00K
% company: 0.14%

Transaction Sep 14, 2026

Transaction context

Classification:: Other / unclassified
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

PURI SUMEET

Officer

Other

Shares: 87.50K
% company: 0.02%

Transaction Sep 14, 2026

Transaction context

Classification:: Other / unclassified
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

SONG HAIYAN

Director

Purchase

Shares: 15.00K
% company: <0.01%
Price: $3.91
Value: $58,700

Transaction Sep 14, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

PURI SUMEET

Officer

Sale

Shares: 34.17K
% company: <0.01%
Price: $4.13
Value: $141,110

Transaction Sep 9, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

PURI SUMEET

Officer

Other

Shares: 68.33K
% company: 0.02%

Transaction Sep 4, 2026

Transaction context

Classification:: Other / unclassified
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

KROEKER NATHAN

Officer

Sale

Shares: 110.42K
% company: 0.03%
Price: $3.36
Value: $371,001

Transaction Jul 28, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

PURI SUMEET

Officer

Sale

Shares: 29.17K
% company: <0.01%
Price: $3.36
Value: $98,001

Transaction Jul 28, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

MASTRANGELO JOE

Chief Executive Officer

Sale

Shares: 159.15K
% company: 0.04%
Price: $3.61
Value: $574,546

Transaction Jul 27, 2026

Transaction context

Classification:: Purchase / sale; plan unknown
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

KROEKER NATHAN

Officer

Other

Shares: 220.83K
% company: 0.06%

Transaction Jul 24, 2026

Transaction context

Classification:: Other / unclassified
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

MASTRANGELO JOE

Chief Executive Officer

Other

Shares: 333.33K
% company: 0.09%

Transaction Jul 24, 2026

Transaction context

Classification:: Other / unclassified
10b5-1:: Unknown; not supplied by provider
Holdings after:: Not reported
Position sold:: Not calculable
Filed:: Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

Eos Energy Enterprises (EOSE) Form 4 insider transactions
#	Insider	% company	Action	Shares	Transaction date
1	MASTRANGELO JOE Chief Executive Officer	0.07%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	250.00K	Sep 16, 2026
2	PURI SUMEET Officer	0.01%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	43.75K	Sep 16, 2026
3	MASTRANGELO JOE Chief Executive Officer	0.14%	OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. Transaction context Classification: Other / unclassified 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	500.00K	Sep 14, 2026
4	PURI SUMEET Officer	0.02%	OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. Transaction context Classification: Other / unclassified 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	87.50K	Sep 14, 2026
5	SONG HAIYAN Director	<0.01%	PurchaseOpen-market or direct purchase reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	15.00K	Sep 14, 2026
6	PURI SUMEET Officer	<0.01%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	34.17K	Sep 9, 2026
7	PURI SUMEET Officer	0.02%	OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. Transaction context Classification: Other / unclassified 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	68.33K	Sep 4, 2026
8	KROEKER NATHAN Officer	0.03%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	110.42K	Jul 28, 2026
9	PURI SUMEET Officer	<0.01%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	29.17K	Jul 28, 2026
10	MASTRANGELO JOE Chief Executive Officer	0.04%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	159.15K	Jul 27, 2026
11	KROEKER NATHAN Officer	0.06%	OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. Transaction context Classification: Other / unclassified 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	220.83K	Jul 24, 2026
12	MASTRANGELO JOE Chief Executive Officer	0.09%	OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. Transaction context Classification: Other / unclassified 10b5-1: Unknown; not supplied by provider Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	333.33K	Jul 24, 2026

Showing 12 of 100 matching Form 4 rows. Percent of company uses current shares outstanding.

Frequently asked

Common questions.

Who are the largest EOSE shareholders?

Blackrock Inc. is the largest reported institutional holder of EOSE, with 27.13 million shares, or about 7.45% of shares outstanding.

What does the institutional filing activity show for EOSE?

Eos Energy Enterprises has 10 institutional rows on file: 8 increased or initiated positions and 2 reduced them.

What insider transactions are available for EOSE?

TECHi shows 100 dated EOSE insider transactions through Sep 16, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Are EOSE insiders buying or selling?

The displayed EOSE activity reads Mixed, sale-heavy: 32 sales and 5 purchases. Other transaction types remain separate.

Who is the most active reported EOSE insider?

MASTRANGELO JOE has the largest absolute share movement in the displayed EOSE filing rows, totaling 3.64 million shares. The action labels provide the transaction context.

All data sources

Search the dated figures used for this view. Each entry identifies its units, reporting period and calculation status.

How to use this page

Use this to check who owns the float and whether insiders are active.

Best for Institutional concentration, insider transaction pattern, and float context.

Weak when Filings are delayed or transactions are administrative rather than economic.

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EOSE research alert

Ask TECHi about EOSE

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Eos Energy Enterprises (EOSE) Institutional Ownership & Insider Trading History

EOSE insider transaction activity: Mixed, sale-heavy.

Ownership concentration and transaction activity

Net shares sold: 2,898,076

Eos Energy Enterprises (EOSE) institutional ownership

Eos Energy Enterprises (EOSE) Form 4 filings

Common questions.