Evans Katie Seitz
Officer · MGNI
As of 2026-09-16, Evans Katie Seitz has 35 Form 4 transactions on record across 1 company — 17 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $10.5M
- Indirect $0
| MGNI | direct | 441,800 sh | $10.5M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-11 | MGNI | Sale | 13,997 @ $24.00 | $336K | −3.1% of holding | 441,800 | Form 4 |
| 2026-09-09 | MGNI | Sale | 11,100 @ $23.46 | $260K | −2.4% of holding | 455,797 | Form 4 |
| 2026-09-08 | MGNI | Sale | 32,285 @ $23.63 | $763K | −6.5% of holding | 466,897 | Form 4 |
| 2026-08-06 | MGNI | Sale | 20,000 @ $24.00 | $480K | −3.9% of holding | 496,840 | Form 4 |
| 2025-08-27 | MGNI | Sale | 21,509 @ $25.52 | $549K | −5.2% of holding | 394,089 | Form 4 |
| 2025-08-25 | MGNI | Sale | 8,345 @ $26.00 | $217K | −2.0% of holding | 415,598 | Form 4 |
| 2025-08-18 | MGNI | Sale | 10,487 @ $23.85 | $250K | −2.4% of holding | 423,943 | Form 4 |
| 2025-06-30 | MGNI | Sale | 16,137 @ $24.00 | $387K | −3.6% of holding | 434,430 | Form 4 |
| 2025-06-30 | MGNI | Sale | 8,358 @ $22.00 | $184K | −1.8% of holding | 450,567 | Form 4 |
| 2025-06-16 | MGNI | Sale | 20,000 @ $18.50 | $370K | −4.3% of holding | 442,788 | Form 4 |
| 2025-06-05 | MGNI | Sale | 35,000 @ $17.36 | $608K | −7.3% of holding | 442,788 | Form 4 |
| 2025-02-07 | MGNI | Sale | 12,520 @ $20.00 | $250K | −2.5% of holding | 492,129 | Form 4 |
23 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-09-08 | MGNI | Option exercise | 13,546 | 499,182 | Form 4 |
| 2026-09-08 | MGNI | Option exercise | 13,546 | 0 | Form 4 |
| 2026-08-15 | MGNI | Withheld for tax | 11,204 | 485,636 | Form 4 |
| 2026-08-06 | MGNI | Option exercise | 20,000 | 516,840 | Form 4 |
| 2026-08-06 | MGNI | Option exercise | 20,000 | 0 | Form 4 |
| 2026-05-15 | MGNI | Withheld for tax | 11,204 | 496,840 | Form 4 |
| 2026-02-15 | MGNI | Withheld for tax | 27,428 | 508,044 | Form 4 |
| 2026-01-09 | MGNI | Withheld for tax | 26,836 | 535,472 | Form 4 |
| 2026-01-09 | MGNI | Option exercise | 51,300 | 0 | Form 4 |
| 2026-01-09 | MGNI | Option exercise | 51,300 | 562,308 | Form 4 |
| 2026-01-01 | MGNI | Award / grant | 127,273 | 511,008 | Form 4 |
| 2026-01-01 | MGNI | Award / grant | 42,757 | 42,757 | Form 4 |
| 2025-11-15 | MGNI | Withheld for tax | 10,354 | 383,735 | Form 4 |
| 2025-06-30 | MGNI | Option exercise | 16,137 | 458,925 | Form 4 |
| 2025-06-30 | MGNI | Option exercise | 16,137 | 0 | Form 4 |
| 2025-06-16 | MGNI | Option exercise | 20,000 | 462,788 | Form 4 |
| 2025-06-16 | MGNI | Option exercise | 20,000 | 16,137 | Form 4 |
| 2025-06-05 | MGNI | Option exercise | 20,000 | 477,788 | Form 4 |
| 2025-06-05 | MGNI | Option exercise | 20,000 | 36,137 | Form 4 |
| 2025-05-15 | MGNI | Withheld for tax | 10,860 | 457,788 | Form 4 |
| 2025-02-15 | MGNI | Withheld for tax | 23,481 | 468,648 | Form 4 |
| 2025-01-09 | MGNI | Award / grant | 41,566 | 41,566 | Form 4 |
| 2025-01-09 | MGNI | Award / grant | 123,479 | 504,649 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.