Eos Energy Enterprises, Inc.
MX ˙ BMV
SecurityMX:EOSE / Eos Energy Enterprises, Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership2,987,574 shares
Latest Disclosed Value $ 14,818,367
Millennium Management Llc ownership in EOSE / Eos Energy Enterprises, Inc.

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 2,987,574 shares of Eos Energy Enterprises, Inc. (MX:EOSE) valued at $14,818,367 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,243,136 shares of Eos Energy Enterprises, Inc.. This represents a change in shares of 140.33% during the quarter.

Millennium Management Llc has a history of taking positions in derivatives of the underlying security (EOSE) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:EOSE / Eos Energy Enterprises, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 2,987,574 1,744,438 140.33 14,818 4.02 0.0062
2026-02-17 2025-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 1,243,136 695,050 126.81 14,246 128.23 0.0060
2025-11-14 2025-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 548,086 -869,282 -61.33 6,243 -13.97 0.0027
2025-08-14 2025-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 1,417,368 -1,104,905 -43.81 7,257 -23.89 0.0035
2025-05-15 2025-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 2,522,273 896,471 55.14 9,534 20.67 0.0051
2025-02-14 2024-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 1,625,802 38,770 2.44 7,901 67.64 0.0039
2024-11-14 2024-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 1,587,032 -1,576,985 -49.84 4,713 17.30 0.0022
2024-08-14 2024-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 3,164,017 3,109,880 5,744.46 4,018 7,205.45 0.0019
2024-05-15 2024-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 54,137 -64,521 -54.38 56 -57.36 0.0000
2024-02-14 2023-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 118,658 71,417 151.18 129 27.72 0.0001
2023-11-14 2023-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 47,241 47,241 102 0.0001
2023-08-14 2023-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 0 -74,895 -100.00 0 -100.00
2023-05-15 2023-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 74,895 -26,148 -25.88 192 28.00 0.0001
2023-02-14 2022-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 101,043 73,678 269.24 150 226.09 0.0001
2022-11-14 2022-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 27,365 -644,568 -95.93 46 -94.34 0.0000
2022-08-15 2022-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 671,933 -730,467 -52.09 813 -86.13 0.0005
2022-05-16 2022-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 1,402,400 1,402,400 5,862 0.0031
2022-02-14 2021-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 0 -24,370 -100.00 0 -100.00
2021-11-15 2021-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 24,370 1,843 8.18 342 -15.56 0.0002
2021-08-16 2021-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 22,527 -31,078 -57.98 405 -61.68 0.0002
2021-05-17 2021-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 53,605 -36,425 -40.46 1,057 -43.66 0.0008
2021-02-16 2020-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 90,030 90,030 1,876 0.0014
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F EOS ENERGY ENTERPRISES COM CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F EOS ENERGY ENTERPRISES COM CL A Call 50,000 -73.68 573 -73.52 n/a n/a n/a
2025-11-14 2025-09-30 13F EOS ENERGY ENTERPRISES COM CL A Call 190,000 2,164 n/a n/a n/a
2023-11-14 2023-09-30 13F EOS ENERGY ENTERPRISES COM CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-08-14 2023-06-30 13F EOS ENERGY ENTERPRISES COM CL A Call 500,000 2,170 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F EOS ENERGY ENTERPRISES COM CL A Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F EOS ENERGY ENTERPRISES COM CL A Put 600,000 6,876 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.