Magnite, Inc. (MGNI) Insider Trading
Over the last 3 months, MGNI insiders made 0 open-market buys and 10 sales, a net sale of -$6.5M (SEC Form 4). Over the last 6 months, 252 institutions increased and 186 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
10
Net (3m)
-$6.5M
Insider trades by month Buys Sells
Oct
Nov
Dec
Feb
May
Jun
Context3-month price +59.8%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 18, 2026 | Buckley Sean Patrickofficer: See Remarks | Sell | 19,233 | $19.00 |
| Jun 17, 2026 | Knopper Douglas Sdirector | Sell | 37,337 | $18.10 |
| Jun 17, 2026 | BARRETT MICHAEL G.director, officer: CEO | Option | 100,000 | $5.80 |
| Jun 17, 2026 | Buonasera Davidofficer: CHIEF TECHNOLOGY OFFICER | Sell | 11,233 | $18.00 |
| Jun 17, 2026 | Buonasera Davidofficer: CHIEF TECHNOLOGY OFFICER | Sell | 1,409 | $19.00 |
| Jun 17, 2026 | Buonasera Davidofficer: CHIEF TECHNOLOGY OFFICER | Sell | 1,057 | $17.00 |
| Jun 17, 2026 | BARRETT MICHAEL G.director, officer: CEO | Option | 178,596 | $5.80 |
| Jun 17, 2026 | BARRETT MICHAEL G.director, officer: CEO | Sell | 100,000 | $17.50 |
| Jun 17, 2026 | BARRETT MICHAEL G.director, officer: CEO | Sell | 178,596 | $16.59 |
| Jun 10, 2026 | Knopper Douglas Sdirector | Grant | 13,798 | — |
| Jun 10, 2026 | Harden Sarah Patriciadirector | Grant | 13,798 | — |
| Jun 10, 2026 | PEARSON DAVID T.director | Sell | 10,766 | $15.65 |
| Jun 10, 2026 | Rossman Jamesdirector | Grant | 13,798 | — |
| Jun 10, 2026 | Spillane Robert Fdirector | Grant | 13,798 | — |
| Jun 10, 2026 | PEARSON DAVID T.director | Grant | 13,798 | — |
| Jun 10, 2026 | Lam Racheldirector | Grant | 13,798 | — |
| Jun 10, 2026 | Caine Pauldirector | Grant | 13,798 | — |
| Jun 10, 2026 | Yu Dianedirector | Grant | 13,798 | — |
| Jun 10, 2026 | Knopper Douglas Sdirector | Sell | 10,766 | $15.73 |
| May 21, 2026 | Spillane Robert Fdirector | Sell | 10,000 | $13.33 |
| May 19, 2026 | Buckley Sean Patrickofficer: President, Revenue | Tax | 12,019 | $12.82 |
| May 19, 2026 | Buonasera Davidofficer: CHIEF TECHNOLOGY OFFICER | Tax | 8,335 | $12.82 |
| May 19, 2026 | Gephart Brianofficer: CHIEF ACCOUNTING OFFICER | Tax | 3,789 | $12.82 |
| May 19, 2026 | Evans Katie Seitzofficer: President, Operations | Tax | 11,204 | $12.82 |
| May 19, 2026 | Day Davidofficer: CHIEF FINANCIAL OFFICER | Tax | 14,170 | $12.82 |
| May 19, 2026 | Saltz Aaronofficer: CHIEF LEGAL OFFICER | Tax | 5,627 | $12.82 |
| May 19, 2026 | BARRETT MICHAEL G.director, officer: CEO | Tax | 10,404 | $12.82 |
| Feb 18, 2026 | Day Davidofficer: CHIEF FINANCIAL OFFICER | Tax | 30,617 | $11.70 |
| Feb 18, 2026 | Buonasera Davidofficer: CHIEF TECHNOLOGY OFFICER | Tax | 17,137 | $11.70 |
| Feb 18, 2026 | Evans Katie Seitzofficer: President, Operations | Tax | 27,428 | $11.70 |
Source: MGNI SEC Form 4 filings, latest Jun 18, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MGNI positions over the last 6 months (SEC Form 13F).
Increased
252
New positions
100
Reduced
186
Sold out
114
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| VANGUARD GROUP INC | Increased | 14.8M | Jan 29, 2026 |
| CAPITAL RESEARCH GLOBAL INVESTORS | Increased | 12.9M | Feb 11, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 12.4M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 11.7M | May 13, 2026 |
| BLACKROCK, INC. | Increased | 11.6M | Feb 12, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 9.2M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 8.6M | Feb 17, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 7.7M | May 8, 2026 |
| FMR LLC | Reduced | 6.7M | Feb 17, 2026 |
| AMERICAN CENTURY COMPANIES INC | Increased | 5.3M | Feb 13, 2026 |
| CAPITAL RESEARCH GLOBAL INVESTORS | Reduced | 5.0M | May 13, 2026 |
| BOSTON PARTNERS | Increased | 4.7M | May 11, 2026 |
| AMERICAN CENTURY COMPANIES INC | Reduced | 4.6M | May 15, 2026 |
| FMR LLC | Reduced | 4.5M | May 15, 2026 |
| BOSTON PARTNERS | Reduced | 4.1M | Feb 13, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.