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BCS

Notice of Proposed Sale · 144

Eos Energy Enterprises, Inc.

EOSENASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Jul 7, 2026Accepted Jul 7, 2026, 4:35 PM EDTFiling CIK 1805077Accession 0001969223-26-000770
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Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
Eos Energy Enterprises, Inc.
Issuer CIK
0001805077
SEC file number
001-39291
Phone
(732) 225-8400
Person for whose account securities are to be sold
Kroeker Nathan
Relationships to issuer
Officer
Street
3920 PARK AVENUE
City
EDISON
State / country code
NJ
Postal code
08820

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common79,309412,406.80339,514,02707/07/2026NASDAQUBS Financial Services Inc.

Broker / market maker — proposed row 1, entry 1

Name
UBS Financial Services Inc.
Street
11 Madison Avenue
Street (continued)
4th Floor
City
New York
State / country code
NY
Postal code
10010

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common07/06/2026RSU VestingIssuer79,309N07/06/2026N/A

Sales reported in the preceding three months

Sales reported in the preceding three months · 1 reported row
SellerSecuritySale dateAmount soldGross proceeds
Nathan KroekerCommon06/30/202635,289206,673.56

Seller — prior-sale row 1, entry 1

Name
Nathan Kroeker
Street
3920 Park Avenue
City
Edison
State / country code
NJ
Postal code
08820

Prior-sale reporting

Nothing to report for the preceding three months
N

Remarks

The shares reported on this Form 144 will be sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person to cover estimated tax withholding obligations from the vesting of restricted stock units.

Notice signature

Notice date
07/07/2026
Signed
/s/ UBS Financial Services Inc, as attorney-in-fact for Nathan Kroeker
Plan adoption dates
09/15/2025

Company context

Eos is accelerating the shift to American energy independence with positively ingenious solutions that transform how the world stores power. The Company’s BESS features the innovative Znyth™ technology, a proven chemistry with readily available non-precious earth components, that is the pre-eminent safe, non-flammable, secure, stable, and scalable alternative to conventional lithium-ion technology. The Company’s BESS is ideal for utility-scale, microgrid, commercial, and industrial long-duration energy storage applications (i.e., 4 to 16+ hours), and provides customers with significant operational flexibility to effectively address current and future increased grid demand and complexity.

Current securities

Historical securities (5)

Recent company filings

  1. 144 filingOct 29, 2026
  2. Results of Operations and Financial Condition · Regulation FD Disclosure · Other EventsOct 19, 2026
  3. 4 filingSep 16, 2026
  4. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory ArrangementsSep 16, 2026
  5. 144 filingSep 16, 2026

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