Here's a clear breakdown of CECO Environmental's SEC filing about its proposed merger with Thermon Group Holdings:

🧾 What This Document Is

This is a Joint Proxy Statement/Prospectus (Form 424B3). It explains the proposed merger between CECO Environmental Corp ("CECO") and Thermon Group Holdings, Inc. ("Thermon"). It's called "joint" because it contains voting materials for both companies' shareholders. It also serves as a prospectus for the new CECO shares to be issued to Thermon shareholders.

👉 Why it matters: If you own stock in CECO or Thermon, this document tells you what the deal is, how you vote, and what you might receive. Your vote is required for the merger to happen.

🤝 The Deal: How the Merger Works

CECO is acquiring Thermon through a two-step merger:

1. First Merger: A CECO subsidiary ("Merger Sub Inc.") merges into Thermon. Thermon survives as a CECO subsidiary.
2. Second Merger: The surviving Thermon entity merges into another CECO subsidiary ("Merger Sub LLC"). Thermon ceases to exist.

👉 Key Takeaway: After the merger, Thermon becomes part of CECO and its stock stops trading separately. CECO stock (Nasdaq: CECO) will represent the combined company.

💰 What Thermon Shareholders Get (The Consideration)

Thermon shareholders choose how to be paid for their shares:

• Mixed Election: 0.6840 shares of CECO stock + $10.00 cash per Thermon share. (This is the default if you make no choice)
• Cash Election: $63.89 cash per Thermon share.
• Stock Election: 0.8110 shares of CECO stock per Thermon share.

⚠️ Crucial Proration Rule: The total cash paid is capped at ~$334 million, and the total new CECO shares issued is capped at ~22.9 million shares.

• The Mixed consideration gets funded first.
• If too many shareholders choose all cash or all stock, those elections will be prorated (you'll get less of what you chose and more of the other).
• You might not get exactly what you elected!

🗳️ Shareholder Meetings & Voting

Both companies hold shareholder meetings on May 27, 2026:

• CECO Annual Meeting:
  • Vote FOR: Issuing new CECO shares for the merger (Required for deal!), electing 8 directors, approving a new equity plan, ratifying auditors (Deloitte & Touche), advisory vote on executive pay, and adjournment if needed.
  • Record Date: April 17, 2026.
• Thermon Special Meeting:
  • Vote FOR: Adopting the merger agreement (Required for deal!), advisory vote on merger-related executive pay, and adjournment if needed.
  • Record Date: April 20, 2026.

👉 Key Takeaway: Both boards unanimously recommend voting FOR all proposals related to the merger. Approval of the CECO share issuance and Thermon merger adoption is mandatory for the deal to close.

📅 Key Dates & Deadlines

• April 17, 2026: CECO record date.
• April 20, 2026: Thermon record date.
• April 23, 2026: Mailing date of this Joint Proxy/Prospectus.
• May 19, 2026: Deadline to request documents from the companies.
• ~5 business days before closing: Deadline to submit your merger consideration election (Thermon shareholders).
• May 27, 2026: Shareholder meetings for both CECO and Thermon (8:00 AM CT, virtual).

👥 Who Owns What After the Merger?

Based on current estimates:

• Old CECO Shareholders: Will own ~62.5% of the combined company.
• Old Thermon Shareholders: Will own ~37.5% of the combined company. (Actual percentages depend on final share counts before closing)

⚖️ Big Picture: Strengths & Risks

• 👍 Strengths/Strategic Rationale (Implied): Combines complementary industrial businesses ("environmentally focused, diversified industrial company" - CECO + "critical process heat tracing solutions" - Thermon). Aims for operational synergies, cost savings, and a stronger combined platform.
• ⚠️ Significant Risks (Highlighted in the filing):
  • Integration Challenges: Merging cultures, systems, and operations is complex and costly. Synergies might not materialize.
  • Proration Uncertainty: Thermon shareholders might receive a different mix of cash/stock than elected.
  • Fixed Exchange Ratios: The stock amounts (0.6840, 0.8110) are fixed. If CECO's stock price drops before closing, the stock/mixed consideration becomes less valuable.
  • Trading Restrictions: If Thermon shareholders make an election, they can't sell their shares until after closing.
  • Tax Risk: The deal is intended to be tax-free for stock/mixed recipients, but an IRS challenge could create tax liability.
  • New Debt: CECO expects to take on significant new debt to fund the cash portion, increasing financial risk.
  • Customer/Supplier Loss: Business partners might react negatively to the merger.
  • Litigation: Risk of lawsuits challenging the merger.

🧠 The Analogy

Imagine two neighboring restaurants, CECO and Thermon, deciding to combine into one bigger establishment. The owners (shareholders) get a choice: take cash for their stake, accept shares in the new combined restaurant, or a mix of both. But there's a catch – there's only so much cash in the register and so many new shares available. If too many owners want all cash, they'll only get some cash and the rest in shares (and vice versa for all shares). The combined restaurant aims to be stronger, but merging the kitchens, staff, and menus is tricky, and taking on a loan to pay some owners cash adds financial pressure.

🧩 Final Takeaway

CECO is acquiring Thermon. Thermon shareholders must vote to approve the deal and must choose how they want to be paid (cash, stock, or a mix), but face the risk of proration altering their choice. CECO shareholders must vote to approve issuing new shares for the deal. Both meetings are on May 27, 2026, and both boards strongly urge a "FOR" vote. The merger promises strategic benefits but carries significant integration and financial risks.