NASDAQ · Industrials · Holders

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.

Last confirmed price: $2.32-2.93%; Oct 13, 2026, 4:00 PM EDT · Prices may be delayed
Market cap · calculated: $844.87M; Oct 13, 2026 · Valuation and sources

Data dates

Prices as of Oct 13, 4:00 PM EDT · Fundamentals checked Oct 13, 9:33 PM EDT

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

Observations shown

110

10 holder / 100 insider

Holder rows: 10; Yahoo Finance · Filing dates shown per row

Increased / initiated: 8; 2 decreased · provider-reported changes

Insider rows: 100; Yahoo Finance · Filing dates shown per row

Ownership concentration and transaction activity

Top 10 reported holders: 33.74% outstanding
Changes with share-count history: Prior-position data unavailable
New / exited positions: 0 / 0 explicitly reported
Largest increase with share-count history: Prior share counts unavailable

These changes cover the holders shown. A holder missing from this list may still own shares. Compare positions from the same reporting quarters.

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.

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.

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: Not reported 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: Not reported 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%	OtherTransaction code reported in the data source. Check the original Form 4 filing for details. Transaction context Classification: Other / unclassified 10b5-1: Not reported 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%	OtherTransaction code reported in the data source. Check the original Form 4 filing for details. Transaction context Classification: Other / unclassified 10b5-1: Not reported 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: Not reported 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: Not reported 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%	OtherTransaction code reported in the data source. Check the original Form 4 filing for details. Transaction context Classification: Other / unclassified 10b5-1: Not reported 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: Not reported 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: Not reported 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: Not reported 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%	OtherTransaction code reported in the data source. Check the original Form 4 filing for details. Transaction context Classification: Other / unclassified 10b5-1: Not reported 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%	OtherTransaction code reported in the data source. Check the original Form 4 filing for details. Transaction context Classification: Other / unclassified 10b5-1: Not reported 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

Questions about this quote

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.

What this page answers

Check who owns the float and whether insiders are active.

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Keep in mind Filings are delayed or transactions are administrative rather than economic.

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