Magnite
MGNI · NASDAQ
$23.81+$0.26 (+1.10%)TodayMarket closed ·
Prev close $23.55
Who owns MGNI
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 41.9% of MGNI’s shares.
- BlackRock Institutional Trust Company, N.A.7.4%
- Vanguard Portfolio Management, LLC5.7%
- Fidelity Management & Research Company LLC4.5%
- Vanguard Capital Management, LLC4.3%
- Next 6 largest institutions20.0%
- All other shareholders58.1%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 10.56M | 7.37% |
| Vanguard Portfolio Management, LLC | 8.20M | 5.72% |
| Fidelity Management & Research Company LLC | 6.41M | 4.48% |
| Vanguard Capital Management, LLC | 6.23M | 4.35% |
| Wellington Management Company, LLP | 6.04M | 4.22% |
| Dimensional Fund Advisors, L.P. | 5.26M | 3.67% |
| Boston Partners | 5.01M | 3.50% |
| American Century Investment Management, Inc. | 4.62M | 3.23% |
| Capital Research Global Investors | 3.87M | 2.70% |
| Geode Capital Management, L.L.C. | 3.79M | 2.65% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 4.35M | 3.03% |
| American Funds SMALLCAP World Fund | 3.77M | 2.63% |
| iShares Russell 2000 ETF | 3.71M | 2.59% |
| Vanguard Small-Cap Index Fund | 3.13M | 2.18% |
| American Century Small Cap Growth Fund | 2.94M | 2.06% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $25.91M (45 trades) of MGNI on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Caine Paul | Sale | 12.50K | $316.13K |
| Sullivan Haas | Award | 24.64K | — |
| Gephart Brian | Award | 64.68K | — |
| Caine Paul | Sale | 7.50K | $198.75K |
| Knopper Douglas S | Sale | 37.34K | $981.22K |
| Buonasera David | Sale | 1.17K | $27.96K |
| Spillane Robert F | Option exercise | 10.36K | — |
| Spillane Robert F | Sale | 10.36K | $246.22K |
| Spillane Robert F | Option exercise | 10.36K | $53.58K |
| Evans Katie Seitz | Sale | 14.00K | $335.93K |
Short interest
Settled Sep 30, 2026
- Shares short
- 10.93M
- Days to cover
- 4.08
- % of shares outstanding
- 7.63%
- Average daily volume
- 2.68M
- Change since last report
- −4.4%
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