Insider · CIK 0001523288
David Day
Files at MGNI (MAGNITE, INC.). First filing Dec 18, 2024, latest Aug 20, 2025.
In brief
David Day files SEC Form 4 as CFO at MGNI (MAGNITE, INC.). Since Dec 18, 2024, David Day has reported 0 open-market buys worth $0 and 7 open-market sells worth $4.6M, the latest filed on Aug 20, 2025.
A track record needs three past buys with six months of prices behind them; David Day has 0, so none is measured yet.
The newest scored trade: sold $319k of MGNI on Aug 18, 2025, filed Aug 20, 2025, scored 51 (moderate).
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 |
|---|---|---|---|---|---|
| 51Moderate | MAGNITE, INC. | $319k 13,366 shares | -3% | +170% from low-1% from high | |
| 35Weak | MAGNITE, INC. | $477k 21,682 shares | -5% | +168% from low0% from high | |
| 32Weak | MAGNITE, INC. | $1.5M 71,000 shares | -15% | +123% from low-5% from high | |
| 23Weak | MAGNITE, INC. | $723k 38,146 shares | -8% | +109% from low-11% from high | |
| 32Weak | MAGNITE, INC. | $1.0M 52,245 shares | -10% | - | |
| 15Weak | MAGNITE, INC. | $227k 13,345 shares | -3% | - | |
| 33Weak | MAGNITE, INC. | $412k 25,144 shares | -6% | - |
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 |
|---|---|---|---|---|---|
| Aug 15, 2025 | MGNI MAGNITE, INC. | 14,518 0.01% of outstanding | $344k | Aug 18, 2025 | $2.7M |
| Jun 30, 2025 | MGNI MAGNITE, INC. | 21,682 0.02% of outstanding | $477k | Jun 30, 2025 | $2.2M |
| Jun 26, 2025 | MGNI MAGNITE, INC. | 36,000 0.03% of outstanding | $754k | Jun 26, 2025 | $1.4M |
| Jun 24, 2025 | MGNI MAGNITE, INC. | 35,000 0.02% of outstanding | $698k | Jun 24, 2025 | $723k |
| Jun 18, 2025 | MGNI MAGNITE, INC. | 38,146 0.03% of outstanding | $723k | Jun 18, 2025 | none |
| Feb 7, 2025 | MGNI MAGNITE, INC. | 39,000 0.03% of outstanding | $780k | Feb 7, 2025 | $882k |
| Feb 6, 2025 | MGNI MAGNITE, INC. | 13,245 0.01% of outstanding | $243k | Feb 6, 2025 | $639k |
| Jan 3, 2025 | MGNI MAGNITE, INC. | 13,345 0.01% of outstanding | $227k | Jan 3, 2025 | $412k |
| Dec 17, 2024 | MGNI MAGNITE, INC. | 13,500 0.01% of outstanding | $220k | Dec 17, 2024 | $191k |
| Dec 16, 2024 | MGNI MAGNITE, INC. | 11,644 0.01% of outstanding | $191k | Dec 16, 2024 | none |
Transactions
Every row this insider has filed, 35 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Aug 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -14,170 | $24.73 | $350k | 452,861 | Aug 18, 2026 |
| Aug 13, 2026 | MGNI MAGNITE, INC. | GGift Common Stock | -26,258 | $0.00 | $0 | 467,031 | Aug 14, 2026 |
| May 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -14,170 | $12.82 | $182k | 493,289 | May 19, 2026 |
| Feb 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -30,617 | $11.70 | $358k | 507,459 | Feb 18, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock | +72,675 | $0.00 | $0 | 573,245 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -35,169 | $16.17 | $569k | 538,076 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Performance Stock Unitsderivative | -72,675 | $0.00 | $0 | 0 | Jan 12, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +131,661 | $0.00 | $0 | 500,570 | Jan 5, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +44,231 | $0.00 | $0 | 44,231 | Jan 5, 2026 |
| Nov 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -13,197 | $14.15 | $187k | 368,909 | Nov 18, 2025 |
| Aug 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -13,366 | $23.85 | $319k | 382,106 | Aug 20, 2025 |
| Aug 15, 2025 | MGNI MAGNITE, INC. | GGift Common Stock | -26,374 | $0.00 | $0 | 395,472 | Aug 19, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -21,682 | $22.00 | $477k | 421,846 | Jul 2, 2025 |
| Jun 24, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +35,000 | $5.28 | $185k | 478,528 | Jun 26, 2025 |
| Jun 24, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -35,000 | $19.95 | $698k | 443,528 | Jun 26, 2025 |
| Jun 26, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +36,000 | $5.28 | $190k | 479,528 | Jun 26, 2025 |
| Jun 26, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -36,000 | $20.95 | $754k | 443,528 | Jun 26, 2025 |
| Jun 24, 2025 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -35,000 | $0.00 | $0 | 80,784 | Jun 26, 2025 |
| Jun 26, 2025 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -36,000 | $0.00 | $0 | 44,784 | Jun 26, 2025 |
| Jun 18, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +38,146 | $4.92 | $188k | 481,674 | Jun 20, 2025 |
| Jun 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -38,146 | $18.95 | $723k | 443,528 | Jun 20, 2025 |
| Jun 18, 2025 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -38,146 | $0.00 | $0 | 0 | Jun 20, 2025 |
| May 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -13,865 | $15.88 | $220k | 443,528 | May 16, 2025 |
| Feb 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -31,113 | $20.00 | $622k | 457,393 | Feb 19, 2025 |
| Feb 6, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -13,245 | $18.35 | $243k | 488,506 | Feb 7, 2025 |
| Feb 7, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +39,000 | $4.92 | $192k | 527,506 | Feb 7, 2025 |
| Feb 7, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -39,000 | $20.00 | $780k | 488,506 | Feb 7, 2025 |
| Feb 7, 2025 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -39,000 | $0.00 | $0 | 38,146 | Feb 7, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +127,737 | $0.00 | $0 | 501,751 | Jan 13, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +43,000 | $0.00 | $0 | 43,000 | Jan 13, 2025 |
| Jan 3, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -13,345 | $17.00 | $227k | 374,014 | Jan 7, 2025 |
| Dec 16, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -11,644 | $16.44 | $191k | 400,859 | Dec 18, 2024 |
| Dec 17, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -13,500 | $16.32 | $220k | 387,359 | Dec 18, 2024 |
| Nov 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -9,128 | $15.85 | $145k | 412,503 | Nov 19, 2024 |
| Nov 15, 2023 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -8,767 | $7.89 | $69k | 407,099 | Nov 17, 2023 |
Questions about David Day
Answered from the filings on this page, as of the latest one.
Is David Day buying or selling?
Not in the last 12 months. David Day's latest open-market trade on SEC Form 4 was sold $319k of MGNI on Aug 18, 2025.
How did David Day's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and David Day has 0.
Where does David Day file Form 4?
David Day has filed Form 4 at MGNI (MAGNITE, INC.) as Chief Financial 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.