Insider · CIK 0001778484
Brian Gephart
Files at MGNI (MAGNITE, INC.). First filing Nov 13, 2024, latest Aug 12, 2026.
In brief
Brian Gephart files SEC Form 4 as CFO at MGNI (MAGNITE, INC.). Since Nov 13, 2024, Brian Gephart has reported 0 open-market buys worth $0 and 7 open-market sells worth $1.3M, the latest filed on Aug 12, 2026.
A track record needs three past buys with six months of prices behind them; Brian Gephart has 0, so none is measured yet.
The newest scored trade: sold $308k of MGNI on Aug 10, 2026, filed Aug 12, 2026, scored 49 (moderate). In the last 12 months: 0 buys worth $0 and 1 sell worth $308k.
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 |
|---|---|---|---|---|---|
| 49Moderate | MAGNITE, INC. | $308k 12,479 shares | -11% | +116% from low-9% from high | |
| 36Weak | MAGNITE, INC. | $684k 27,671 shares | -23% | +176% from low-6% from high | |
| 38Weak | MAGNITE, INC. | $71k 2,961 shares | -2% | +170% from low-1% from high | |
| 40Moderate | MAGNITE, INC. | $102k 6,334 shares | -5% | +79% from low-24% from high | |
| 33Weak | MAGNITE, INC. | $100k 6,250 shares | -4% | - | |
| 16Weak | MAGNITE, INC. | $34k 2,156 shares | -2% | - | |
| 15Weak | MAGNITE, INC. | $32k 2,156 shares | -2% | - |
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 10, 2026 | MGNI MAGNITE, INC. | 12,479 0.01% of outstanding | $308k | Aug 10, 2026 | none |
| Sep 4, 2025 | MGNI MAGNITE, INC. | 27,671 0.02% of outstanding | $684k | Sep 4, 2025 | $71k |
| Aug 15, 2025 | MGNI MAGNITE, INC. | 3,217 0.00% of outstanding | $76k | Aug 18, 2025 | none |
| May 12, 2025 | MGNI MAGNITE, INC. | 6,334 0.00% of outstanding | $102k | May 12, 2025 | $100k |
| Mar 4, 2025 | MGNI Magnite, Inc. | 6,250 0.00% of outstanding | $100k | Mar 3, 2025 | none |
| Nov 18, 2024 | MGNI MAGNITE, INC. | 2,156 0.00% of outstanding | $34k | Nov 18, 2024 | $32k |
Transactions
Every row this insider has filed, 18 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Oct 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +64,682 | $0.00 | $0 | 167,010 | 11 d ago |
| Aug 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -3,789 | $24.73 | $94k | 102,328 | Aug 18, 2026 |
| Aug 10, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -12,479 | $24.68 | $308k | 106,117 | Aug 12, 2026 |
| May 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -3,789 | $12.82 | $49k | 118,596 | May 19, 2026 |
| Feb 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -6,149 | $11.70 | $72k | 122,385 | Feb 18, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +39,185 | $0.00 | $0 | 128,534 | Jan 5, 2026 |
| Nov 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -3,549 | $14.15 | $50k | 89,349 | Nov 18, 2025 |
| Sep 4, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -27,671 | $24.71 | $684k | 92,898 | Sep 5, 2025 |
| Aug 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -2,961 | $23.85 | $71k | 120,569 | Aug 20, 2025 |
| May 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -3,045 | $15.88 | $48k | 123,530 | May 16, 2025 |
| May 12, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -6,334 | $16.16 | $102k | 126,575 | May 14, 2025 |
| Mar 3, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -6,250 | $16.00 | $100k | 132,909 | Mar 5, 2025 |
| Feb 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -6,749 | $20.00 | $135k | 139,159 | Feb 19, 2025 |
| Jan 2, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +33,113 | $0.00 | $0 | 145,908 | Jan 6, 2025 |
| Nov 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock10b5-1 | -2,031 | $15.85 | $32k | 114,951 | Nov 19, 2024 |
| Nov 18, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,156 | $15.60 | $34k | 112,795 | Nov 19, 2024 |
| Nov 11, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -2,156 | $15.00 | $32k | 116,982 | Nov 13, 2024 |
| Nov 15, 2023 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -1,100 | $7.89 | $8,679 | 94,322 | Nov 17, 2023 |
Questions about Brian Gephart
Answered from the filings on this page, as of the latest one.
Is Brian Gephart buying or selling?
In the last 12 months Brian Gephart reported 0 open-market buys worth $0 and 1 open-market sell worth $308k on SEC Form 4; the latest was sold $308k of MGNI on Aug 10, 2026. Grants, option exercises and tax withholding are not counted.
How did Brian Gephart's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Brian Gephart has 0.
Where does Brian Gephart file Form 4?
Brian Gephart has filed Form 4 at MGNI (MAGNITE, INC.) as Chief Accounting 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.