As of November 7, 2026, Koppers Holdings Inc. is a publicly traded company (NYSE: KOP). The largest holder reporting an active stake on Schedule 13D is Simcoe Capital Management, LLC, at 5.6%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include BlackRock (15.3%), Dimensional (6.7%), Vanguard (5.04%) (Schedule 13D/A, October 22, 2026).
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Is Koppers Holdings Inc. a real, registered company?
- Koppers Holdings Inc files with the SEC under CIK 1315257 (its SEC filings).
- Its shares are listed under the ticker KOP on NYSE (SEC company record).
- Incorporated in Pennsylvania; business address in Pittsburgh, Pennsylvania, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Koppers Holdings Inc in our court records and SEC 8-K records (as of 2026-11-07).
- Layoffs: 2 exit or restructuring plans reported on Form 8-K, Item 2.05 (latest filed 2026-05-08, about 85 jobs).
- Leadership changes: the latest reported is Eric D. Brenner, Chief Financial Officer (Form 8-K filed 2026-05-11). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Vanguard (filed 2026-10-30).
Who are Koppers Holdings Inc.'s owners and officers?
Koppers Holdings Inc.: incorporated in Pennsylvania; business address in Pittsburgh, Pennsylvania; industry Lumber & Wood Products (No Furniture) (Schedule 13G, 2026-10-30).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-10-30 | Vanguard Capital Management | 5.04% |
| Schedule 13D/A, 2026-10-22 | Simcoe Capital Management, LLC | 5.6% |
| Schedule 13G/A, 2026-10-19 | Pzena Investment Management LLC | 4.9% |
| Schedule 13G/A, 2026-10-08 | Dimensional Fund Advisors LP | 6.7% |
| Schedule 13G/A, 2026-07-31 | Vanguard Capital Management | 4.96% |
| Schedule 13D, 2026-05-19 | Simcoe Capital Management, LLC | 7% |
| Schedule 13G/A, 2026-05-13 | Fuller & Thaler Asset Management, Inc. | 4.98% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.08% |
| Schedule 13G/A, 2026-04-24 | Blackrock, Inc. | 15.3% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G/A, 2025-10-31 | The Vanguard Group | 7.8% |
Questions about who owns Koppers Holdings Inc.
Who owns Koppers Holdings Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Koppers Holdings Inc.: Blackrock, Inc. (15.3%, Schedule 13G/A, filed 2026-04-24), Dimensional Fund Advisors LP (6.7%, Schedule 13G/A, filed 2026-10-08), Simcoe Capital Management, LLC (5.6%, Schedule 13D/A, filed 2026-10-22) and Vanguard Capital Management (5.04%, Schedule 13G, filed 2026-10-30).
Who are the largest shareholders of Koppers Holdings Inc.?
By the share each holder's latest filing reports, the largest holders of Koppers Holdings Inc. on this page are Blackrock, Inc. (15.3%), Dimensional Fund Advisors LP (6.7%) and Simcoe Capital Management, LLC (5.6%).
When did Blackrock, Inc. buy into Koppers Holdings Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-04-24, reporting 15.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Koppers Holdings Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-05-11 | Eric D. Brenner | Chief Financial Officer | appointed | 2026-05-26 |
Which insiders own Koppers Holdings Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and a director: 429,355.4 shares (2.3% of shares outstanding) (Form 4, 2026-09-01).
- , a director: 83,834 shares (0.45% of shares outstanding) (Form 4, 2026-05-11).
- , the president and chief technology officer: 82,897.74 shares (0.44% of shares outstanding) (Form 4, 2026-08-12).
- , the chief legal and sus officer: 63,150 shares (0.34% of shares outstanding) (Form 4, 2026-03-02).
- , a director: 47,754 shares (0.25% of shares outstanding) (Form 4, 2025-05-06).
Shares outstanding: 18,796,413 as of 2026-10-30, from the company's latest SEC cover page.
How much has Koppers Holdings Inc. raised?
No fundraising or offering filing from Koppers Holdings Inc. is on file with us.
Red flags found
2 exit or restructuring plans on Form 8-K (latest Form 8-K, 2026-05-08).
Keep reading
More on Koppers Holdings Inc and the records around it.
Koppers Holdings Inc elsewhere on the record
- 5%+ stake filings Oct 2026
- Leadership changes May 2026
- Layoff notices May 2026
Companies that share a holder
- Fuller & Thaler Asset Management, Inc. also filed stake reports on 35 other companies: COLLEGIUM PHARMACEUTICAL, INC (Aug 2026), Graphic Packaging Holding Co (Aug 2026), Primoris Services Corp (Aug 2026)
- PZENA INVESTMENT MANAGEMENT LLC also filed stake reports on 37 other companies: ADVANCE AUTO PARTS INC (Oct 2026), Globant S.A. (Oct 2026), SKYWORKS SOLUTIONS, INC. (Oct 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
Related pages
LayoffsLeadership changes5%+ holders
Filings, cases and notices link to their records. A not-found line names the records searched; it is not proof of absence.
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