David Buonasera is CTO at MAGNITE, INC. (MGNI). They have made 5 open-market trades across 1 company since 2023, most recently 2026-09-14.
CIK 0001966857
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.
0 open-market purchases, against 5 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MGNI | 245,155 | $5.7M |
Shares reported on the most recent Form 4, priced at the 2026-09-16 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MGNI | SELL · 10b5-1 | 2026-09-14 | 2026-09-16 | $24.00 | $28K | -12.1% | -12.2% | — |
| MGNI | SELL · 10b5-1 | 2026-09-01 | 2026-09-03 | $23.68 | $152K | -1.8% | +3.1% | — |
| MGNI | SELL · 10b5-1 | 2026-08-06 | 2026-08-07 | $23.46 | $179K | -2.6% | -3.2% | — |
| MGNI | SELL · 10b5-1 | 2026-07-07 | 2026-07-09 | $21.00 | $26K | -10.4% | +13.4% | +18.2% |
| MGNI | SELL · 10b5-1 | 2026-07-01 | 2026-07-02 | $20.00 | $188K | +0.9% | -3.5% | +24.5% |
| MGNI | SELL · 10b5-1 | 2026-06-15 | 2026-06-17 | $18.03 | $247K | +4.2% | +4.2% | +30.3% |
| MGNI | SELL · 10b5-1 | 2026-06-01 | 2026-06-03 | $15.00 | $21K | +13.3% | +40.9% | +54.6% |
| MGNI | SELL · 10b5-1 | 2025-09-03 | 2025-09-04 | $25.37 | $150K | -7.8% | -23.0% | -42.5% |
| MGNI | SELL | 2025-08-18 | 2025-08-20 | $23.85 | $374K | +16.2% | +17.8% | -39.1% |
| MGNI | SELL · 10b5-1 | 2025-06-30 | 2025-07-02 | $22.00 | $204K | -5.4% | -10.9% | -12.5% |
| MGNI | SELL · 10b5-1 | 2025-05-23 | 2025-05-28 | $15.56 | $250K | +5.9% | +27.4% | +51.8% |
| MGNI | SELL · 10b5-1 | 2024-12-13 | 2024-12-13 | $16.31 | $32K | +0.8% | -5.8% | -26.7% |
| MGNI | SELL · 10b5-1 | 2024-11-27 | 2024-11-27 | $16.78 | $7K | +1.1% | -1.6% | +4.4% |
| MGNI | SELL · 10b5-1 | 2024-11-22 | 2024-11-26 | $17.00 | $157K | -0.3% | -1.1% | +5.2% |
| MGNI | SELL · 10b5-1 | 2024-11-18 | 2024-11-19 | $15.77 | $4K | +5.7% | -3.4% | +19.2% |
| MGNI | SELL · 10b5-1 | 2024-11-14 | 2024-11-15 | $16.41 | $407K | +5.4% | +3.4% | +23.6% |
| MGNI | SELL · 10b5-1 | 2024-08-15 | 2024-08-16 | $12.65 | $127K | +8.5% | +12.0% | +33.0% |
| MGNI | SELL · 10b5-1 | 2024-05-16 | 2024-05-17 | $12.50 | $69K | +5.6% | +18.4% | +6.8% |
| MGNI | SELL | 2023-09-06 | 2023-09-07 | $8.58 | $47K | -7.6% | -11.2% | -0.2% |
| MGNI | SELL | 2023-08-16 | 2023-08-18 | $8.31 | $22K | +4.4% | -2.8% | -4.0% |
| MGNI | SELL | 2023-07-03 | 2023-07-06 | $13.43 | $178K | +16.1% | +13.2% | -42.9% |
| MGNI | SELL | 2023-05-16 | 2023-05-18 | $10.88 | $17K | +1.4% | +14.5% | -28.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.