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Magnite MGNI

US equityMarket cap rank #2363
$24.96 +$0.23 (+0.93%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $24.96 0.00%
Open$24.99
Prev close$24.73
Day range$24.75 – $25.38
Volume1.52M
Market cap$3.58B
P/E (TTM)22.7
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership102.0%+0.18 pts vs. prior quarter
Institutions holding361-2 vs. prior quarter
Insider trades (recent)2 buys / 47 sellsNet selling
Short interest7.97% of floatDays to cover 5.3 · as of 15 Sep 2026
Short-sale volume share18.9%5-day average of daily volume

Short-sale volume as % of daily volume

10%15%20%24%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$8.39M (4 inflow days, 16 outflow days).

The five largest holders on file together own 29.2% of shares outstanding.

Largest holders

  • BlackRock8.86%
  • Vanguard Portfolio Management, LLC5.72%
  • FMR5.41%
  • Vanguard Capital Management, LLC5.03%
  • Wellington Management Group4.21%
  • Dimensional Fund Advisors3.67%
  • Boston Partners Global Investors, Inc.3.50%
  • American Century Investment Management3.22%

By investor type

  • Mutual Fund75.02%
  • Hedge Fund17.67%
  • Public Company3.22%
  • Government Pension Fund2.57%
  • Private Company2.27%
  • Individual/Insider1.24%
  • Insurance Company1.04%
  • Family Office/Trust0.14%

Reported short interest has fallen from 10.27% to 7.97% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 11,433,129 8.0% 5.3
31 Aug 2026 10,978,762 7.7% 5.6
14 Aug 2026 11,178,680 7.8% 3.1
31 Jul 2026 11,638,779 8.1% 5.6
15 Jul 2026 13,606,133 9.5% 5.4
30 Jun 2026 14,712,876 10.3% 3.6

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