🔥 What This Document Is

This is a "definitive additional material" filing (DEFA14A), which is basically extra information sent to shareholders to convince them to vote a certain way. It's not the full proxy statement itself, but a follow-up that highlights key arguments.

👉 In simple terms: Eos Energy is asking its owners (shareholders) to vote "YES" on Proposal 4, which would let the company create more shares of its own stock. This document explains why they say it's critical for the company's future.

🏢 What The Company Does

👉 In simple terms: Eos Energy makes large, long-duration batteries for the power grid. Think of them as the makers of giant rechargeable batteries that help store energy from solar or wind farms and release it when needed, helping to stabilize the electricity grid.

They are in the hot and growing clean energy storage industry, competing to build the infrastructure for a more renewable-powered world.

💰 The Financial Moves That Led Here

The company has used its existing shares in some major financial deals to strengthen its position. Here’s a quick look at the key moves they highlight:

Partnership with Cerberus (A Big Investment Firm):

• Gave Cerberus warrants and preferred stock (which can become common stock) in exchange for a $315.5 million financing package.
• Why it mattered: This cash helped Eos scale up manufacturing, pay off old expensive debt, and get strategic advice.

Two Big "Convertible Note" Sales: These are loans that can be turned into company stock.

1. May 2025 Notes (6.75% interest): Used to refinance $126 million of even costlier debt and prepay $50 million of the Cerberus loan. This lowered their interest costs significantly.
2. November 2025 Notes (1.75% interest): They borrowed $600 million at a much lower rate and used it to pay back the costlier May 2025 notes.

👉 The Big Picture: Eos has been actively fixing its balance sheet—replacing high-cost debt with lower-cost debt and extending when that debt is due. Using stock as part of these deals has been a key tool.

⚠️ The Core Problem: They're Running Out of Shares to Issue

Here’s the heart of the issue. Eos has 600 million shares it’s allowed to issue (its "authorized" shares). As of late 2025, only 7% of those shares are still available.

The Immediate Crisis: The $600 million in notes sold in November 2025 can be converted into a maximum of 46,948,320 shares. Because Eos doesn’t have enough authorized shares left, it cannot currently settle these notes by giving out stock. It would have to pay them back in cash—potentially hundreds of millions of dollars.

🚀 Why They Need 200 Million More Shares

Proposal 4 asks to increase the authorized share count from 600 million to 800 million. Eos gives several reasons this is crucial:

1. Keep the Option to Pay Debt with Stock: Most importantly, it would allow them to settle those November 2031 notes with shares instead of cash, preserving their cash for operations and growth.
2. Align Employees with Shareholders: They state every employee is a stockholder. More shares allow them to keep granting stock awards to attract and retain talent.
3. Fund Future Growth: More shares provide flexibility to make strategic acquisitions, form partnerships, or raise capital if needed.
4. It's a Limited Request: They stress the 200 million share increase is for specific, prudent purposes—not just a blank check.

📅 How to Vote & Key Dates

Record Date: April 13, 2026. You must be a shareholder on this date to vote. If your shares are on loan (e.g., you're in a margin account or your broker lent them out), you might lose your vote. Eos gives specific instructions to:

1. Disable share lending in your brokerage account settings.
2. Recall any loaned shares by contacting your broker well before April 13, 2026.

👉 Why this matters to them: The company notes there is "significant short interest" (many bets that the stock will fall), meaning many shares could be out on loan, potentially suppressing voter turnout for their proposal.

🧠 The Analogy

Imagine you run a growing pizza shop. You promise to pay back a big loan from a supplier by giving them slices of your shop (shares) instead of cash. But you realize you’ve already promised out 93% of your shop to early partners and employees. You’re out of slices to give! Proposal 4 is like asking your current owners for permission to make 200 more slices. This lets you keep your cash for new ovens and ingredients (growth) while fulfilling your promise to the supplier.

📇 Key Contacts & People

For Investors:

• Department: Investor Relations
• Address: 3920 Park Avenue, Edison, New Jersey 08820
• Phone: 862-207-7955
• Email: [email protected]
• Website: https://investors.eose.com/

Participants in the Solicitation:

• The Company, its directors, and certain executive officers will be soliciting your vote. Their specific holdings are listed in the full Preliminary Proxy Statement.

🧩 Final Takeaway

Eos Energy is at a critical financial junction. They've successfully restructured their debt but now face a potential cash crunch if they can't use stock to settle upcoming obligations. Proposal 4 is their requested escape hatch. Voting "YES" gives them the necessary shares to manage debt, retain talent, and maintain financial flexibility. Voting "NO" could force a large cash outflow, straining the company's resources right as it tries to scale up production.