🕵️ Koppers Holdings Inc. ($KOP)
SEC insider & ownership activity, last 12 months · CIK 1315257 · every row links its SEC filing
Over the last 12 months insiders sold $834K with no open-market buying against it. Ball M Leroy sold $834K (Aug–Jun). Blackrock, Inc. trimmed 17.8% → 15.3%. No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 1 seller, $834K (8 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Ball M Leroy | 0 | – | 8 | $834K | Jun 18, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 15.3% | 13G | Apr 24, 2026 | filing ↗ | |
| Simcoe Capital Management, LLC | 7.0% | 13D | May 12, 2026 | filing ↗ | |
| Jacobowitz Jeffrey | 7.0% | 13D | May 12, 2026 | filing ↗ | |
| Simcoe Management Company, LLC | 6.8% | 13D | May 12, 2026 | filing ↗ | |
| Simcoe Partners L P | 6.4% | 13D | May 12, 2026 | filing ↗ | |
| Pzena Investment Management LLC | 6.1% | 13G | Apr 28, 2025 | filing ↗ | |
| Vanguard Capital Management | 5.1% | 13G | Apr 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Ball M Leroy | $92K | Mar 2, 2026 | filing ↗ |
| Ball M Leroy | $75K | Aug 15, 2025 | filing ↗ |
| Washington Kevin | $71K | Aug 11, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | May 11, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 11, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Exit or disposal costs (2.05) | May 7, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 7, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 7, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Earnings (2.02) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 5, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 5, 2026 | filing ↗ |
| Other events (8.01) | Jan 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 5, 2026 | filing ↗ |
| Earnings (2.02) | Nov 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 7, 2025 | filing ↗ |
| Officer/director changes (5.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Officer/director changes (5.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Earnings (2.02) | Aug 8, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 8, 2025 | filing ↗ |
| Exit or disposal costs (2.05) | Nov 8, 2024 | filing ↗ |