Insider · CIK 0001700262
Katie Seitz Evans
Files at MGNI (MAGNITE, INC.). First filing Nov 13, 2024, latest Sep 11, 2026.
In brief
Katie Seitz Evans files SEC Form 4 as COO and president at MGNI (MAGNITE, INC.). Since Nov 13, 2024, Katie Seitz Evans has reported 0 open-market buys worth $0 and 11 open-market sells worth $4.9M, the latest filed on Sep 11, 2026.
A track record needs three past buys with six months of prices behind them; Katie Seitz Evans has 0, so none is measured yet.
The newest scored trade: sold $336k of MGNI on Sep 11, 2026, filed Sep 11, 2026, scored 25 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 3 sells worth $1.8M.
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 |
|---|---|---|---|---|---|
| 25Weak | MAGNITE, INC. | $336k 13,997 shares | -3% | +112% from low-8% from high | |
| 20Weak | MAGNITE, INC. | $1.0M 43,385 shares | -9% | +112% from low-9% from high | |
| 13Weak | MAGNITE, INC. | $480k 20,000 shares | -4% | +117% from low-8% from high | |
| 54Moderate | MAGNITE, INC. | $549k 21,509 shares | -5% | +184% from low0% from high | |
| 27Weak | MAGNITE, INC. | $217k 8,345 shares | -2% | +181% from low0% from high | |
| 48Moderate | MAGNITE, INC. | $250k 10,487 shares | -2% | +170% from low-1% from high | |
| 19Weak | MAGNITE, INC. | $571k 24,495 shares | -5% | +168% from low0% from high | |
| 15Weak | MAGNITE, INC. | $370k 20,000 shares | -4% | +106% from low-12% from high | |
| 20Weak | MAGNITE, INC. | $608k 35,000 shares | -7% | +94% from low-18% from high | |
| 28Weak | MAGNITE, INC. | $250k 12,520 shares | -2% | - | |
| 27Weak | MAGNITE, INC. | $205k 12,824 shares | -3% | - |
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 11, 2026 | MGNI MAGNITE, INC. | 13,997 0.01% of outstanding | $336k | Sep 11, 2026 | $1.5M |
| Sep 9, 2026 | MGNI MAGNITE, INC. | 11,100 0.01% of outstanding | $260k | Sep 9, 2026 | $1.2M |
| Sep 8, 2026 | MGNI MAGNITE, INC. | 32,285 0.02% of outstanding | $763k | Sep 8, 2026 | $480k |
| Aug 6, 2026 | MGNI MAGNITE, INC. | 20,000 0.01% of outstanding | $480k | Aug 6, 2026 | none |
| Aug 27, 2025 | MGNI MAGNITE, INC. | 21,509 0.02% of outstanding | $549k | Aug 27, 2025 | $2.0M |
| Aug 25, 2025 | MGNI MAGNITE, INC. | 8,345 0.01% of outstanding | $217k | Aug 25, 2025 | $1.8M |
| Aug 15, 2025 | MGNI MAGNITE, INC. | 11,391 0.01% of outstanding | $270k | Aug 18, 2025 | $1.5M |
| Jun 30, 2025 | MGNI MAGNITE, INC. | 24,495 0.02% of outstanding | $571k | Jun 30, 2025 | $978k |
| Jun 16, 2025 | MGNI MAGNITE, INC. | 20,000 0.01% of outstanding | $370k | Jun 16, 2025 | $608k |
| Jun 5, 2025 | MGNI MAGNITE, INC. | 35,000 0.02% of outstanding | $608k | Jun 5, 2025 | none |
| Feb 7, 2025 | MGNI MAGNITE, INC. | 12,520 0.01% of outstanding | $250k | Feb 7, 2025 | $205k |
| Nov 12, 2024 | MGNI MAGNITE, INC. | 12,825 0.01% of outstanding | $205k | Nov 11, 2024 | $205k |
Transactions
Every row this insider has filed, 41 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 11, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -13,997 | $24.00 | $336k | 441,800 | 33 d ago |
| Sep 8, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +13,546 | $5.16 | $70k | 499,182 | 34 d ago |
| Sep 8, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -32,285 | $23.63 | $763k | 466,897 | 34 d ago |
| Sep 9, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -11,100 | $23.46 | $260k | 455,797 | 34 d ago |
| Sep 8, 2026 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -13,546 | $0.00 | $0 | 0 | 34 d ago |
| Aug 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -11,204 | $24.73 | $277k | 485,636 | Aug 18, 2026 |
| Aug 6, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +20,000 | $5.16 | $103k | 516,840 | Aug 7, 2026 |
| Aug 6, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -20,000 | $24.00 | $480k | 496,840 | Aug 7, 2026 |
| Aug 6, 2026 | MGNI MAGNITE, INC. | MOption exercise Employee Stock Option (Right to Buy)derivative10b5-1 | -20,000 | $0.00 | $0 | 0 | Aug 7, 2026 |
| May 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -11,204 | $12.82 | $144k | 496,840 | May 19, 2026 |
| Feb 15, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -27,428 | $11.70 | $321k | 508,044 | Feb 18, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Common Stock | +51,300 | $0.00 | $0 | 562,308 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -26,836 | $16.17 | $434k | 535,472 | Jan 12, 2026 |
| Jan 9, 2026 | MGNI MAGNITE, INC. | MOption exercise Performance Stock Unitsderivative | -51,300 | $0.00 | $0 | 0 | Jan 12, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +127,273 | $0.00 | $0 | 511,008 | Jan 5, 2026 |
| Jan 1, 2026 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +42,757 | $0.00 | $0 | 42,757 | Jan 5, 2026 |
| Nov 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -10,354 | $14.15 | $147k | 383,735 | Nov 18, 2025 |
| Aug 27, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -21,509 | $25.52 | $549k | 394,089 | Aug 29, 2025 |
| Aug 25, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -8,345 | $26.00 | $217k | 415,598 | Aug 26, 2025 |
| Aug 18, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock | -10,487 | $23.85 | $250k | 423,943 | Aug 20, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +16,137 | $3.61 | $58k | 458,925 | Jul 2, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -8,358 | $22.00 | $184k | 450,567 | Jul 2, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -16,137 | $24.00 | $387k | 434,430 | Jul 2, 2025 |
| Jun 30, 2025 | MGNI MAGNITE, INC. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -16,137 | $0.00 | $0 | 0 | Jul 2, 2025 |
| Jun 16, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +20,000 | $3.61 | $72k | 462,788 | Jun 18, 2025 |
| Jun 16, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -20,000 | $18.50 | $370k | 442,788 | Jun 18, 2025 |
| Jun 16, 2025 | MGNI MAGNITE, INC. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -20,000 | $0.00 | $0 | 16,137 | Jun 18, 2025 |
| Jun 5, 2025 | MGNI MAGNITE, INC. | MOption exercise Common Stock10b5-1 | +20,000 | $3.61 | $72k | 477,788 | Jun 6, 2025 |
| Jun 5, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -35,000 | $17.36 | $608k | 442,788 | Jun 6, 2025 |
| Jun 5, 2025 | MGNI MAGNITE, INC. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -20,000 | $0.00 | $0 | 36,137 | Jun 6, 2025 |
| May 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -10,860 | $15.88 | $172k | 457,788 | May 16, 2025 |
| Feb 15, 2025 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -23,481 | $20.00 | $470k | 468,648 | Feb 19, 2025 |
| Feb 7, 2025 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -12,520 | $20.00 | $250k | 492,129 | Feb 7, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +123,479 | $0.00 | $0 | 504,649 | Jan 13, 2025 |
| Jan 9, 2025 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +41,566 | $0.00 | $0 | 41,566 | Jan 13, 2025 |
| Nov 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -7,483 | $15.85 | $119k | 381,170 | Nov 19, 2024 |
| Nov 11, 2024 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -12,824 | $16.00 | $205k | 388,653 | Nov 13, 2024 |
| Feb 15, 2024 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -23,105 | $9.74 | $225k | 432,949 | Feb 16, 2024 |
| Jan 2, 2024 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +113,821 | $0.00 | $0 | 456,054 | Jan 4, 2024 |
| Jan 2, 2024 | MGNI MAGNITE, INC. | AGrant or award Performance Stock Unitsderivative | +40,602 | $0.00 | $0 | 40,602 | Jan 4, 2024 |
| Nov 15, 2023 | MGNI MAGNITE, INC. | FTax withholding Common Stock | -6,800 | $7.89 | $54k | 342,233 | Nov 17, 2023 |
Questions about Katie Seitz Evans
Answered from the filings on this page, as of the latest one.
Is Katie Seitz Evans buying or selling?
In the last 12 months Katie Seitz Evans reported 0 open-market buys worth $0 and 3 open-market sells worth $1.8M on SEC Form 4; the latest was sold $336k of MGNI on Sep 11, 2026. Grants, option exercises and tax withholding are not counted.
How did Katie Seitz Evans's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Katie Seitz Evans has 0.
Where does Katie Seitz Evans file Form 4?
Katie Seitz Evans has filed Form 4 at MGNI (MAGNITE, INC.) as CHIEF OPERATING 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.