Koppers Holdings Inc has 7 Schedule 13D or 13G filings on record since 2025-10-31. 2 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 15.3% | 2,952,521 | SCHEDULE 13G/A, 2026-04-24 | 2026-03-31 |
| Simcoe Capital Management, LLC | 7% | 1,349,005 | SCHEDULE 13D, 2026-05-19 | 2026-05-12 |
| Fuller & Thaler Asset Management, Inc. | 4.98% | 978,590 | SCHEDULE 13G/A, 2026-05-13 | 2026-03-31 |
| Vanguard Capital Management | 4.96% | 955,150 | SCHEDULE 13G/A, 2026-07-31 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Purpose of Transaction (Item 4)
Simcoe Capital Management, LLC
The Reporting Persons purchased the Shares based on the Reporting Persons' belief that the Shares, when purchased, were substantially undervalued. Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable. The Reporting Persons are supportive of management's current plan to increase the Issuer's profitability, the strong focus on free cash flow generation and the use of such funds to reduce debt and repurchase Shares. No Reporting Person has any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein. Depending on various factors including, without limitation, the Issuer's financial position, results and strategic direction, actions taken by the Issuer's management and Board of Directors (the "Board"), other investment opportunities available to the Reporting Persons, the price levels of the Shares, conditions in the …The first part of Item 4 of the SCHEDULE 13D filed 2026-05-19; the filing has the rest
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 |
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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.