As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Koppers Holdings Inc. The largest reported stake is BlackRock, Inc.'s, at 15.3%. 11 filings are on record since October 31, 2025 (Schedule 13G/A, April 24, 2026).
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Key facts
- · Reporting person: Vanguard Capital Management · Sole voting: 140,535 · Shared voting: 0 · Sole dispositive: 954,282 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-30
- · Reporting person: Simcoe Capital Management, LLC · Sole voting: 1,063,279 · Shared voting: 0 · Sole dispositive: 1,063,279 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-10-22
- · Reporting person: Pzena Investment Management LLC · Sole voting: 757,368 · Shared voting: 0 · Sole dispositive: 926,505 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-19
- · Reporting person: Dimensional Fund Advisors LP · Sole voting: 1,240,909 · Shared voting: 0 · Sole dispositive: 1,265,529 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-08
- · Holder: Vanguard Capital Management · Percent: 4.96% · SCHEDULE 13G/A
Koppers Holdings Inc has 11 Schedule 13D or 13G filings on record since 2025-10-31. 4 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: about 85 jobs, latest 2026-05-08 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 15.3% | 2,952,521 | SCHEDULE 13G/A, 2026-04-24 | 2026-03-31 |
| Dimensional Fund Advisors LP | 6.7% | 1,265,529 | SCHEDULE 13G/A, 2026-10-08 | 2026-09-30 |
| Simcoe Capital Management, LLC | 5.6% | 1,063,279 | SCHEDULE 13D/A, 2026-10-22 | 2026-10-20 |
| Vanguard Capital Management | 5.04% | 954,282 | SCHEDULE 13G, 2026-10-30 | 2026-09-30 |
| Fuller & Thaler Asset Management, Inc. | 4.98% | 978,590 | SCHEDULE 13G/A, 2026-05-13 | 2026-03-31 |
| Pzena Investment Management LLC | 4.9% | 926,505 | SCHEDULE 13G/A, 2026-10-19 | 2026-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Koppers Holdings Inc and the records around it.
Koppers Holdings Inc elsewhere on the record
- Leadership changes May 2026
- Layoff notices May 2026
- Who owns it
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)
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The Short Answer
Which Company This Is
What They Do, And How The Money Works
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The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Dimensional Fund Advisors LP | 1,240,909 | 0 | 1,265,529 | 0 | SCHEDULE 13G/A, 2026-10-08 |
| Simcoe Capital Management, LLC | 1,063,279 | 0 | 1,063,279 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| Simcoe Partners L P | 873,494 | 0 | 873,494 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| Simcoe Select, LP | 154,000 | 0 | 154,000 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| Simcoe Management Company, LLC | 1,027,494 | 0 | 1,027,494 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| SDR Partners, LLC | 35,785 | 0 | 35,785 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| Jacobowitz Jeffrey | 1,063,279 | 0 | 1,063,279 | 0 | SCHEDULE 13D/A, 2026-10-22 |
| Vanguard Capital Management | 140,535 | 0 | 954,282 | 0 | SCHEDULE 13G, 2026-10-30 |
| Pzena Investment Management LLC | 757,368 | 0 | 926,505 | 0 | SCHEDULE 13G/A, 2026-10-19 |
The latest filing identifies Koppers Holdings Inc by CUSIP 50060P106 and gives its principal executive office as 436 Seventh Avenue, Pittsburgh, PA 15219 (SCHEDULE 13G, 2026-10-30).
Source of funds (Item 3)
Item 3 is hereby amended and restated to read as follows: The shares of the Issuer's Common Stock (the "Shares") purchased by each of Simcoe Partners, Simcoe Select and SDR Partners were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases. The aggregate purchase price of the 873,494 Shares directly owned by Simcoe Partners is approximately $24,977,523, including brokerage commissions.Simcoe Capital Management, LLC, SCHEDULE 13D/A, 2026-10-22
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-31 | The Vanguard Group | 7.8% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-24 | BlackRock, Inc. | 15.3% | SCHEDULE 13G/A |
| 2026-04-30 | Vanguard Capital Management | 5.08% | SCHEDULE 13G |
| 2026-05-13 | Fuller & Thaler Asset Management, Inc. | 4.98% | SCHEDULE 13G/A |
| 2026-05-19 | Simcoe Capital Management, LLC | 7% | SCHEDULE 13D |
| 2026-07-31 | Vanguard Capital Management | 4.96% | SCHEDULE 13G/A |
| 2026-10-08 | Dimensional Fund Advisors LP | 6.7% | SCHEDULE 13G/A |
| 2026-10-19 | Pzena Investment Management LLC | 4.9% | SCHEDULE 13G/A |
| 2026-10-22 | Simcoe Capital Management, LLC | 5.6% | SCHEDULE 13D/A |
| 2026-10-30 | Vanguard Capital Management | 5.04% | SCHEDULE 13G |
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.
Also on the record for Koppers Holdings Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| May 11, 2026 | Leadership change: Eric D. Brenner appointed, Chief Financial Officer | — | Leadership changes | Source |
| May 8, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.