M. Leroy Ball is CEO at Koppers Holdings Inc. (KOP). They have made 39 open-market trades across 3 companies since 2008, most recently 2026-08-31.
CIK 0001229771
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
9 open-market purchases totalling $995K since 2010, against 30 sales. Across 9 scored buys the stock is up 10.3% at ninety days, and 9.2 points ahead of the S&P over the same stretch.
9 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| KOP | 429,355 | $18.6M |
| ATI | 34,737 | $6.5M |
| CCC | 178,464 | $1.4M |
| Total | $26.4M |
Shares reported on the most recent Form 4, priced at the 2026-09-01 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 22% | 67% | 89% |
| Avg Move | -7.4% | +3.5% | +10.3% |
| Alpha | -3.5% | +4.4% | +9.2% |
| Scored | 9 | 9 | 9 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| KOP | SELL | 2026-08-31 | 2026-09-01 | $45.96 | $184K | -0.8% | -2.6% | — |
| KOP | SELL | 2026-08-19 | 2026-08-20 | $45.84 | $138K | +2.5% | +1.5% | — |
| KOP | SELL | 2026-06-18 | 2026-06-23 | $43.90 | $150K | +8.3% | +15.1% | +4.7% |
| KOP | SELL | 2026-06-11 | 2026-06-15 | $41.34 | $171K | +1.3% | +8.9% | +3.4% |
| KOP | SELL | 2026-05-13 | 2026-05-14 | $42.55 | $113K | +2.8% | +7.0% | +9.1% |
| KOP | SELL | 2026-03-17 | 2026-03-18 | $37.91 | $94K | +2.2% | +1.0% | +18.2% |
| KOP | SELL | 2026-03-02 | 2026-03-04 | $36.87 | $231K | +1.1% | -5.7% | +11.9% |
| KOP | SELL | 2025-08-15 | 2025-08-18 | $30.48 | $149K | -2.6% | -2.7% | -6.4% |
| KOP | SELL | 2025-03-19 | 2025-03-20 | $29.22 | $206K | -5.5% | -16.4% | +6.4% |
| KOP | SELL | 2024-11-19 | 2024-11-20 | $37.26 | $446K | +0.0% | -18.4% | -20.3% |
| KOP | SELL | 2024-11-14 | 2024-11-18 | $37.39 | $606K | +1.0% | -17.8% | -20.5% |
| KOP | SELL | 2024-11-12 | 2024-11-14 | $37.85 | $653K | +1.3% | -13.2% | -20.7% |
| KOP | SELL | 2024-08-29 | 2024-08-30 | $38.35 | $292K | -6.1% | -6.5% | -1.5% |
| KOP | SELL | 2024-08-27 | 2024-08-28 | $39.06 | $156K | -6.3% | -4.8% | -1.5% |
| KOP | SELL | 2024-06-20 | 2024-06-20 | $39.73 | $180K | -4.5% | +0.9% | -4.6% |
| KOP | SELL | 2024-06-06 | 2024-06-10 | $43.07 | $215K | -6.8% | -15.9% | -12.8% |
| KOP | SELL | 2024-05-24 | 2024-05-29 | $42.62 | $319K | -1.4% | -12.4% | -7.8% |
| KOP | SELL | 2024-03-06 | 2024-03-07 | $52.88 | $777K | -0.3% | +4.5% | -16.7% |
| KOP | SELL | 2024-03-04 | 2024-03-06 | $53.46 | $876K | -1.6% | +4.8% | -19.2% |
| KOP | SELL | 2023-12-20 | 2023-12-21 | $49.27 | $345K | -5.0% | +2.7% | +11.1% |
| KOP | SELL | 2023-12-01 | 2023-12-04 | $44.60 | $584K | -0.3% | +1.8% | +16.2% |
| KOP | SELL | 2023-11-14 | 2023-11-16 | $42.64 | $1.2M | +4.2% | +8.6% | +19.6% |
| KOP | SELL | 2023-08-30 | 2023-08-31 | $38.59 | $77K | -5.2% | +3.1% | +15.8% |
| KOP | SELL | 2020-08-28 | 2020-09-01 | $24.67 | $123K | -8.7% | -13.8% | +11.0% |
| ATI | BUY | 2019-08-13 | 2019-08-15 | $18.18 | $36K | +3.9% | +24.8% | +32.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.