Koppers Holdings Inc.
KOP- Exchange
- NYSE
- Industry
- Lumber & Wood Products (No Furniture)
- SEC CIK
- 0001315257
In the last 90 days, Koppers Holdings Inc. insiders filed 0 open-market purchases and 6 sales; 217 institutions reported holding it in 13F filings for Q2 2026, worth $871.2M in total; no superinvestor holds it.
Holders of 5% or more of KOP
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Koppers Holdings Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 17.80%3.59M shares | −1.80 ppfrom 19.60% | Feb 5, 20252 filings | Apr 23, 2025 | SEC |
| Vanguard Group Inc | 13G/A | 7.80%1.54M shares | −1.58 ppfrom 9.38% | Apr 30, 20252 filings | Oct 31, 2025 | SEC |
| Pzena Investment Management LLC | 13G | 6.10%1.22M shares | New | Apr 28, 20251 filing | Apr 28, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Koppers Holdings Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Oct 31, 202511:04 AM ET | Vanguard Group Inc | 13G/A | 7.80%1.54M shares | −1.58 ppfrom 9.38% | Sep 30, 2025 | SEC |
| Apr 30, 202511:23 AM ET | Vanguard Group Inc | 13G/A | 9.38%1.92M shares | – | Mar 31, 2025 | SEC |
| Apr 28, 20258:28 AM ET | Pzena Investment Management LLC | 13G | 6.10%1.22M shares | New | Mar 31, 2025 | SEC |
| Apr 23, 20258:57 PM ET | BlackRock, Inc. | 13G/A | 17.80%3.59M shares | −1.80 ppfrom 19.60% | Mar 31, 2025 | SEC |
| Feb 5, 20255:28 PM ET | BlackRock, Inc. | 13G/A | 19.60%3.98M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Koppers Holdings Inc. shares.
No Form 144 notices for Koppers Holdings Inc. are on file.