An investigation is examining whether Koppers Holdings adequately disclosed the business and operational challenges affecting its financial performance before third-quarter results and a substantial reduction in full-year 2026 guidance sent KOP shares lower.

NEW YORK, Nov. 6, 2026 /PRNewswire/ — Koppers Holdings Inc. (NYSE: KOP) shareholders are absorbing losses after the Company’s third-quarter adjusted EBITDA fell 18% to $58 million and net income declined approximately 38% year over year, prompting the Company to slash its full-year 2026 adjusted EPS guidance from $3.80–$4.20 to $3.10–$3.25 and sending shares lower. If you bought KOP and are now holding a loss, your legal rights may be at stake. Investors who lost money are encouraged to submit your losses for review now , or contact Joseph E. Levi, Esq. at jlevi@levikorsinsky.com  or (212) 363-7500.

The investigation focuses on Koppers’ financial and operational performance. The Company reported weaker-than-expected third-quarter 2026 results and significantly reduced its full-year 2026 financial guidance, citing ongoing business challenges and lower-than-anticipated profitability.

Levi & Korsinsky is investigating whether Koppers made materially false or misleading statements or failed to disclose material information regarding its business and financial performance, and whether potential securities law violations occurred.

Shareholders who purchased Koppers stock and suffered a loss can start a confidential loss review today . Questions may be directed to Joseph E. Levi, Esq. by email at jlevi@levikorsinsky.com  or by telephone at (212) 363-7500.

WHY LEVI & KORSINSKY  — Ranked in ISS Securities Class Action Services’ Top 50 Report for seven consecutive years, Levi & Korsinsky, LLP is a nationally recognized leader in shareholder rights litigation. With a team of over 70 professionals, the firm has recovered billions of dollars for investors.

Frequently Asked Questions About the KOP Investigation

Q: Who is eligible to participate in the KOP investigation?  A: Investors who purchased KOP stock or securities and suffered financial losses may be eligible. Eligibility is based on purchase date and documented losses — not on whether you still hold the shares.

Q: Which statements are being investigated as potentially misleading?  A: The investigation concerns whether Koppers Holdings made materially false or misleading statements regarding its business operations, financial performance, and fiscal 2026 outlook. On November 6, 2026, the Company reported third-quarter results below analyst expectations and significantly lowered its full-year 2026 financial guidance, causing KOP shares to decline.

Q: What do KOP investors need to do right now?  A: Investors may gather brokerage records showing purchase dates, share quantities, and prices paid. Submit your information for a no-cost, no-obligation evaluation of your potential recovery . No immediate action is required to remain eligible to participate in the investigation.

Q: What documents do I need to participate?  A: Brokerage statements or trade confirmations showing purchase dates, share quantities, prices paid, and any subsequent sale dates and prices.

Q: What if I already sold my KOP shares — can I still recover losses?  A: Yes. Eligibility is based on when you purchased, not whether you still hold the shares. Investors who bought KOP and sold at a loss may still participate in the investigation.

Q: What does it cost me to participate?  A: There is no upfront cost to submit your information and review whether you may be eligible to recover. Should you choose to participate in any resulting action, these matters are generally handled on a contingency basis, with any attorneys’ fees and expenses subject to court approval.

Q: Do I need to go to court or give testimony?  A: No. Participating in the investigation does not require court appearances or depositions. If legal action is later pursued, the overwhelming majority of affected investors never appear in court either.

CONTACT:

Levi & Korsinsky, LLP

Joseph E. Levi, Esq.

Ed Korsinsky, Esq.

33 Whitehall Street, 27th Floor

New York, NY 10004

jlevi@levikorsinsky.com

Tel: (212) 363-7500

Fax: (212) 363-7171

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SOURCE Levi & Korsinsky, LLP