Eos Energy Enterprises, Inc.
MX ˙ BMV
SecurityMX:EOSE / Eos Energy Enterprises, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership22,634 shares
Latest Disclosed Value $ 112,265
Principal Financial Group Inc reports 24.14% increase in ownership of EOSE / Eos Energy Enterprises, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 22,634 shares of Eos Energy Enterprises, Inc. (MX:EOSE) valued at $112,265 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 18,232 shares of Eos Energy Enterprises, Inc.. This represents a change in shares of 24.14% during the quarter.

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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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)
2026-05-04 2026-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 22,634 4,402 24.14 112 -46.15 0.0000
2026-02-02 2025-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 18,232 -1,262 -6.47 209 -6.31 0.0001
2025-11-04 2025-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 19,494 3,666 23.16 222 174.07 0.0001
2025-08-08 2025-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 15,828 15,828 81 0.0000
2024-07-29 2024-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 0 -19,704 -100.00 0 -100.00
2024-04-29 2024-03-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 19,704 5,851 42.24 20 33.33 0.0000
2024-02-07 2023-12-31 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 13,853 2,605 23.16 15 -37.50 0.0000
2023-11-02 2023-09-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 11,248 -1,327 -10.55 24 -55.56 0.0000
2023-08-07 2023-06-30 13F EOS ENERGY ENTERPRISES COM CL A 29415C101 12,575 12,575 55 0.0000
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.