Mark Zagorski is CEO at DoubleVerify Holdings, Inc. (DV). They have made 8 open-market trades across 3 companies since 2017, most recently 2026-09-15.
CIK 0001709574
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.
8 open-market purchases totalling $1.4M since 2017, never a sale. Across 8 scored buys the stock is up 0.8% at ninety days, and 1.5 points behind the S&P over the same stretch.
8 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 38% | 63% | 38% |
| Avg Move | +1.6% | +4.2% | +0.8% |
| Alpha | +2.3% | +4.4% | -1.5% |
| Scored | 8 | 8 | 8 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| DV | BUY | 2025-05-31 | 2025-06-17 | $11.68 | $13K | +4.1% | +7.0% | -9.5% |
| DV | BUY | 2024-11-30 | 2024-12-17 | $15.30 | $11K | -5.4% | -5.3% | -29.0% |
| DV | BUY | 2024-05-31 | 2024-06-18 | $15.47 | $11K | +4.8% | +4.2% | -9.2% |
| DV | BUY | 2023-11-30 | 2023-12-21 | $28.22 | $11K | -7.2% | +9.3% | -9.5% |
| DV | BUY | 2023-09-19 | 2023-09-21 | $28.36 | $100K | -1.5% | +0.9% | +27.7% |
| DV | BUY | 2022-03-29 | 2022-03-31 | $25.64 | $966K | -5.4% | -16.0% | -15.1% |
| TLRA | BUY | 2017-11-17 | 2017-11-20 | $4.02 | $40K | -2.4% | -5.6% | +8.5% |
| TRMR | BUY | 2017-08-11 | 2017-08-15 | $2.42 | $203K | +25.5% | +39.0% | +42.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.