MAGNITE, INC. Insider Trading Activity
Every SEC Form 4 insider transaction reported for MAGNITE, INC. (MGNI), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are MGNI insiders buying or selling?
In the last 12 months, MAGNITE, INC. insiders reported 0 open-market purchases ($0) and 42 sales ($27.0M) — net selling of $27.0M. Since August 2018, Trabud has recorded 311 Form 4 filings for MGNI: 3 buys ($414.4K) and 308 sells ($145.1M).
Source: SEC EDGAR Form 4
What stands out
- No MAGNITE, INC. insider made an open-market purchase in the last 12 months; the 42 reported open-market sales totaled $27.0M.
Key Statistics (August 2018 – Oct 14, 2026)
Total Form 4 filings
311
SEC EDGAR
Insider filers
24
Insider buys (3)
$414.4K
Insider sells (308)
$145.1M
Insider sentiment
Net sellingNet insider flow of $144.7M in net selling since August 2018, and $27.0M in net selling over the last 12 months.
Recent MGNI insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | Paul Caine | Director | Sale | 12.5K | $25.29 | $316.1K | SEC ↗ |
| Sep 18, 2026 | Paul Caine | Director | Sale | 7.5K | $26.50 | $198.8K | SEC ↗ |
| Sep 18, 2026 | Douglas S Knopper | Director | Sale | 37.3K | $26.28 | $981.2K | SEC ↗ |
| Sep 16, 2026 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sale | 1.2K | $24.00 | $28.0K | SEC ↗ |
| Sep 16, 2026 | Robert F Spillane | Director | Sale | 10.4K | $23.76 | $246.2K | SEC ↗ |
| Sep 11, 2026 | Katie Seitz Evans | President, Product & Operations | Sale | 14.0K | $24.00 | $335.9K | SEC ↗ |
| Sep 11, 2026 | Aaron Saltz | CHIEF LEGAL OFFICER | Sale | 40.0K | $23.41 | $936.4K | SEC ↗ |
| Sep 11, 2026 | Paul Caine | Director | Sale | 5.0K | $23.53 | $117.7K | SEC ↗ |
| Sep 10, 2026 | Katie Seitz Evans | President, Product & Operations | Sale | 43.4K | $23.59 | $1.0M | SEC ↗ |
| Sep 3, 2026 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sale | 6.4K | $23.68 | $151.9K | SEC ↗ |
| Aug 28, 2026 | Sarah Patricia Harden | Director | Sale | 49.0K | $23.57 | $1.2M | SEC ↗ |
| Aug 18, 2026 | Paul Caine | Director | Sale | 7.5K | $25.00 | $187.5K | SEC ↗ |
| Aug 18, 2026 | Sean Patrick Buckley | President, Revenue & Market Strategy | Sale | 11.0K | $24.48 | $270.0K | SEC ↗ |
| Aug 12, 2026 | Brian Gephart | CHIEF ACCOUNTING OFFICER | Sale | 12.5K | $24.68 | $308.0K | SEC ↗ |
| Aug 12, 2026 | Rachel Lam | Director | Sale | 10.0K | $24.16 | $241.6K | SEC ↗ |
| Aug 12, 2026 | Paul Caine | Director | Sale | 5.0K | $24.35 | $121.8K | SEC ↗ |
| Aug 7, 2026 | Sean Patrick Buckley | President, Revenue & Market Strategy | Sale | 67.2K | $24.49 | $1.6M | SEC ↗ |
| Aug 7, 2026 | Douglas S Knopper | Director | Sale | 37.3K | $22.72 | $848.3K | SEC ↗ |
| Aug 7, 2026 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sale | 7.6K | $23.46 | $179.5K | SEC ↗ |
| Aug 7, 2026 | Katie Seitz Evans | President, Product & Operations | Sale | 20.0K | $24.00 | $480.0K | SEC ↗ |
| Aug 7, 2026 | Michael G. Barrett | CEO | Sale | 294.0K | $22.72 | $6.7M | SEC ↗ |
| Jul 17, 2026 | Michael G. Barrett | CEO | Sale | 38.6K | $20.35 | $785.4K | SEC ↗ |
| Jul 14, 2026 | Paul Caine | Director | Sale | 5.0K | $20.64 | $103.2K | SEC ↗ |
| Jul 9, 2026 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sale | 1.2K | $21.00 | $25.7K | SEC ↗ |
| Jul 9, 2026 | Sean Patrick Buckley | President, Revenue & Market Strategy | Sale | 19.2K | $21.03 | $404.5K | SEC ↗ |
Showing the 25 most recent of 311 Form 4 filings for MAGNITE, INC..
Most active MGNI insiders
- Adam Lee Soroca37 filings
- David Day35 filings
- Michael G. Barrett33 filings
- Aaron Saltz26 filings
- Katie Seitz Evans24 filings
Ask anything about MGNI insider activity
Use Trabud's AI agent to query MAGNITE, INC.'s Form 4 history in plain English — "Show me MGNI CEO purchases this year" or compare it against any other ticker.
Open the AI agentMGNI insider trading FAQ
Are MAGNITE, INC. insiders buying or selling?
In the last 12 months, MAGNITE, INC. insiders reported 0 open-market purchases ($0) and 42 sales ($27.0M) — net selling of $27.0M. Since August 2018, Trabud has recorded 311 Form 4 filings for MGNI: 3 buys ($414.4K) and 308 sells ($145.1M). Over the full record that is net selling of $144.7M.
How many insiders trade MGNI stock?
24 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for MAGNITE, INC.. The most recent filing was accepted on Oct 14, 2026.
Where does Trabud get MGNI insider trading data?
All MGNI insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.