Insider · CIK 0001966857
David Buonasera
Files at MGNI (MAGNITE, INC.). First filing Nov 15, 2024, latest Sep 16, 2026.
David Buonasera files SEC Form 4 as officer at MGNI (MAGNITE, INC.). Since Nov 15, 2024, David Buonasera has reported 0 open-market buys worth $0 and 13 open-market sells worth $1.5M, the latest filed on Sep 16, 2026.
A track record needs three past buys with six months of prices behind them; David Buonasera has 0, so none is measured yet.
The newest scored trade: sold $28k of MGNI on Sep 14, 2026, filed Sep 16, 2026, scored 15 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 4 sells worth $448k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
MGNI: MAGNITE, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 15Weak | MAGNITE, INC. | $28k 1,165 shares | -0% | +113% from low-8% from high | |
| 21Weak | MAGNITE, INC. | $152k 6,414 shares | -3% | +104% from low-12% from high | |
| 23Weak | MAGNITE, INC. | $247k 13,699 shares | -5% | +50% from low-37% from high | |
| 3Weak | MAGNITE, INC. | $21k 1,409 shares | -0% | +37% from low-42% from high | |
| 18Weak | MAGNITE, INC. | $75k 2,950 shares | -1% | +173% from low-7% from high | |
| 42Moderate | MAGNITE, INC. | $187k 7,834 shares | -3% | +170% from low-1% from high | |
| 22Weak | MAGNITE, INC. | $204k 9,289 shares | -4% | +168% from low0% from high | |
| 22Weak | MAGNITE, INC. | $195k 12,395 shares | -5% | +71% from low-27% from high | |
| 15Weak | MAGNITE, INC. | $32k 1,969 shares | -1% | - | |
| 10Weak | MAGNITE, INC. | $7,232 431 shares | -0% | - | |
| 21Weak | MAGNITE, INC. | $157k 9,219 shares | -4% | - | |
| 10Weak | MAGNITE, INC. | $4,368 277 shares | -0% | - | |
| 22Weak | MAGNITE, INC. | $204k 12,412 shares | -5% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Sep 3, 2025 | MGNI MAGNITE, INC. | 2,950 0.00% of outstanding | $75k | Sep 3, 2025 | $391k |
| Aug 15, 2025 | MGNI MAGNITE, INC. | 8,510 0.01% of outstanding | $202k | Aug 18, 2025 | $399k |
| Jun 30, 2025 | MGNI MAGNITE, INC. | 9,289 0.01% of outstanding | $204k | Jun 30, 2025 | $195k |
| May 27, 2025 | MGNI MAGNITE, INC. | 8,742 0.01% of outstanding | $140k | May 27, 2025 | $55k |
| May 23, 2025 | MGNI MAGNITE, INC. | 3,653 0.00% of outstanding | $55k | May 23, 2025 | none |
| Dec 13, 2024 | MGNI MAGNITE, INC. | 1,969 0.00% of outstanding | $32k | Dec 13, 2024 | $372k |
| Nov 27, 2024 | MGNI MAGNITE, INC. | 431 0.00% of outstanding | $7,232 | Nov 27, 2024 | $365k |
| Nov 22, 2024 | MGNI MAGNITE, INC. | 9,219 0.01% of outstanding | $157k | Nov 22, 2024 | $208k |
| Nov 18, 2024 | MGNI MAGNITE, INC. | 277 0.00% of outstanding | $4,368 | Nov 18, 2024 | $204k |
| Nov 14, 2024 | MGNI MAGNITE, INC. | 12,412 0.01% of outstanding | $204k | Nov 14, 2024 | $127k |
Transactions
Every row this insider has filed, 30 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 14, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,165 | $24.00 | $28k | 245,155 | 27 d ago |
| Sep 1, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -5,371 | $23.42 | $126k | 247,363 | 40 d ago |
| Sep 2, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,043 | $25.00 | $26k | 246,320 | 40 d ago |
| Jun 15, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,057 | $17.00 | $18k | 291,727 | Jun 17, 2026 |
| Jun 16, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -11,233 | $18.00 | $202k | 280,494 | Jun 17, 2026 |
| Jun 17, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,409 | $19.00 | $27k | 279,085 | Jun 17, 2026 |
| Jun 1, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,409 | $15.00 | $21k | 292,784 | Jun 3, 2026 |
| May 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -8,335 | $12.82 | $107k | 294,193 | May 19, 2026 |
| Feb 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -17,137 | $11.70 | $201k | 302,095 | Feb 18, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock | +22,935 | $0.00 | $0 | 331,562 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -12,330 | $16.17 | $199k | 319,232 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Performance Stock Unitsderivative | -22,935 | $0.00 | $0 | 0 | Jan 12, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +76,803 | $0.00 | $0 | 308,627 | Jan 5, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +25,801 | $0.00 | $0 | 25,801 | Jan 5, 2026 |
| Nov 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -7,129 | $14.15 | $101k | 231,824 | Nov 18, 2025 |
| Sep 3, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,950 | $25.37 | $75k | 238,629 | Sep 4, 2025 |
| Aug 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -7,834 | $23.85 | $187k | 241,579 | Aug 20, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -9,289 | $22.00 | $204k | 249,413 | Jul 2, 2025 |
| May 23, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -3,653 | $15.03 | $55k | 267,444 | May 28, 2025 |
| May 27, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -8,742 | $16.00 | $140k | 258,702 | May 28, 2025 |
| May 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -8,038 | $15.88 | $128k | 271,097 | May 16, 2025 |
| Feb 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -17,384 | $20.00 | $348k | 278,795 | Feb 19, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +72,384 | $0.00 | $0 | 296,179 | Jan 13, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +24,366 | $0.00 | $0 | 24,366 | Jan 13, 2025 |
| Dec 13, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -1,969 | $16.31 | $32k | 223,795 | Dec 13, 2024 |
| Nov 27, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -431 | $16.78 | $7,232 | 225,764 | Nov 27, 2024 |
| Nov 22, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -9,219 | $17.00 | $157k | 226,195 | Nov 26, 2024 |
| Nov 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock10b5-1 | -5,056 | $15.85 | $80k | 235,691 | Nov 19, 2024 |
| Nov 18, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -277 | $15.77 | $4,368 | 235,414 | Nov 19, 2024 |
| Nov 14, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -12,412 | $16.41 | $204k | 240,403 | Nov 15, 2024 |
Questions about David Buonasera
Answered from the filings on this page, as of the latest one.
Is David Buonasera buying or selling?
In the last 12 months David Buonasera reported 0 open-market buys worth $0 and 4 open-market sells worth $448k on SEC Form 4; the latest was sold $28k of MGNI on Sep 14, 2026. Grants, option exercises and tax withholding are not counted.
How did David Buonasera's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and David Buonasera has 0.
Where does David Buonasera file Form 4?
David Buonasera has filed Form 4 at MGNI (MAGNITE, INC.) as CHIEF TECHNOLOGY OFFICER. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.