Magnite Inc (MGNI)
Who owns Magnite Inc (MGNI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.5% of the shares are freely tradable; institutional investors hold 94.2%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Group Inc | 10.34 | 14,802,630 | +1.0 | 12/31/2025 |
| BlackRock Inc | 8.14 | 11,657,496 | +0.6 | 03/31/2026 |
| Wellington Management Company LLP | 6.42 | 9,191,077 | +6.5 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.39 | 7,726,205 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.32 | 6,190,403 | +0.0 | 03/31/2026 |
| Capital Research Global Investors | 3.51 | 5,020,289 | -61.1 | 03/31/2026 |
| Boston Partners Global Investors, Inc | 3.30 | 4,719,863 | +14.9 | 03/31/2026 |
| American Century Companies Inc | 3.23 | 4,626,816 | -12.5 | 03/31/2026 |
| FMR Inc | 3.15 | 4,507,419 | -32.7 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds SMALLCAP World A | 3.42 | 4,895,360 | -57.4 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 15. Jul 2026 | Barrett Michael G. | CEO | Sell | 38,596 | 20.35 | 785,429 |
| 15. Jul 2026 | Barrett Michael G. | CEO | Other | 38,596 | 5.80 | 223,857 |
| 10. Jul 2026 | Caine Paul | Director | Sell | 5,000 | 20.64 | 103,200 |
| 7. Jul 2026 | Buonasera David | CHIEF TECHNOLOGY OFFICER | Sell | 1,224 | 21.00 | 25,704 |
| 7. Jul 2026 | Buckley Sean Patrick | See Remarks | Sell | 19,233 | 21.03 | 404,470 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.