Security record · archived quarter
MGNI
Magnite, Inc. · Communication Services · Advertising Agencies
102Tracked holders
-2Δ holders
99.58MShares held
$1.62BReported value
+0New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth -1.9% ·
share flow -10.6% ·
net new positions -2.0%
— formula
Broad distribution — falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 103 | -1 | 93.04M | $1.77B | +9 | −10 |
| Q1 2026 | 107 | +5 | 86.26M | $1.03B | +8 | −3 |
| Q4 2025 | 102 | -2 | 99.58M | $1.62B | — | −2 |
| Q3 2025 | 19 | +4 | 66.20M | $1.44B | +4 | −1 |
| Q2 2025 | 13 | -1 | 54.58M | $1.32B | +1 | −2 |
| Q1 2025 | 11 | -1 | 13.35M | $152.28M | — | −1 |
| Q4 2024 | 12 | +1 | 14.99M | $238.72M | +1 | — |
| Q3 2024 | 10 | 0 | 14.78M | $204.65M | — | — |
| Q2 2024 | 10 | — | 8.59M | $114.16M | — | — |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 14.80M | +1.0% | $240.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 14.80M | +1.0% | $240.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 14.80M | +1.0% | $240.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 14.80M | +1.0% | $240.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 14.80M | +1.0% | $240.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 6 | Capital Research Global Investors | 12.92M | — | $209.70M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 25 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 26 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 27 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 28 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 29 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 30 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 31 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 32 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 35 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 36 | American Century Companies Inc | 5.29M | — | $85.81M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Boston Partners | 4.11M | — | $66.60M | 0.1% | n/c | 1 | SEC ↗ |
| 38 | Boston Partners | 4.11M | — | $66.60M | 0.1% | n/c | 1 | SEC ↗ |
| 39 | Boston Partners | 4.11M | — | $66.60M | 0.1% | n/c | 1 | SEC ↗ |
| 40 | Dimensional Fund Advisors Lp | 3.62M | — | $58.69M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Dimensional Fund Advisors Lp | 3.62M | — | $58.69M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Dimensional Fund Advisors Lp | 3.62M | — | $58.69M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Dimensional Fund Advisors Lp | 3.62M | — | $58.69M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Dimensional Fund Advisors Lp | 3.62M | — | $58.69M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Nuveen, LLC | 3.53M | — | $57.31M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Nuveen, LLC | 3.53M | — | $57.31M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Nuveen, LLC | 3.53M | — | $57.31M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Geode Capital Management ✦ (passive) | 3.43M | +1.0% | $55.74M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 49 | Geode Capital Management ✦ (passive) | 3.43M | +1.0% | $55.74M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 50 | State Street Global Advisors ✦ (passive) | 3.14M | +0.5% | $50.99M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 53 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 54 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 55 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 56 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 57 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 58 | Goldman Sachs Group ✦ | 1.76M | -26.2% | $28.58M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 59 | Goldman Sachs Group ✦ | 1.76M | -26.2% | $28.58M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 60 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 61 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 62 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 64 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 65 | Northern Trust Corp | 1.27M | — | $20.65M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Charles Schwab Investment… | 1.19M | — | $19.27M | 0.0% | n/c | 1 | SEC ↗ |
| 67 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 68 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Bank of New York Mellon Corp | 1.18M | — | $19.21M | 0.0% | n/c | 1 | SEC ↗ |
| 78 | Balyasny Asset Management L.P. | 873.21K | — | $14.17M | 0.0% | n/c | 1 | SEC ↗ |
| 79 | T. Rowe Price ✦ | 711.50K | -72.1% | $11.55M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 80 | T. Rowe Price ✦ | 711.50K | -72.1% | $11.55M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 81 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 82 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 85 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 86 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 87 | Bank Of America Corp /De/ | 651.95K | — | $10.58M | 0.0% | n/c | 1 | SEC ↗ |
| 88 | Nomura Asset Management Co Ltd | 622.70K | — | $10.11M | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Citadel Advisors ✦ | 544.32K | +221.0% | $8.83M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 90 | Citadel Advisors ✦ | 544.32K | +221.0% | $8.83M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 91 | JPMorgan Chase ✦ | 506.39K | -79.1% | $8.22M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 92 | JPMorgan Chase ✦ | 506.39K | -79.1% | $8.22M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 93 | JPMorgan Chase ✦ | 506.39K | -79.1% | $8.22M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 94 | JPMorgan Chase ✦ | 506.39K | -79.1% | $8.22M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 95 | New York State Common Retirement… | 474.46K | — | $7.70M | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Nordea Investment Management Ab | 445.02K | — | $7.34M | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Nordea Investment Management Ab | 445.02K | — | $7.34M | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Russell Investments Group, Ltd. | 451.02K | — | $7.32M | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Russell Investments Group, Ltd. | 451.02K | — | $7.32M | 0.0% | n/c | 1 | SEC ↗ |
| 100 | Russell Investments Group, Ltd. | 451.02K | — | $7.32M | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Point72 Asset Management | $6.65M | was 0.0% |
| D. E. Shaw & Co. | $4.61M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 295 holders, 130.58M shares, $1.54B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Aug 18
Buckley Sean Patrick
Officer · 2.76K sh · $68,975
Aug 17
Buckley Sean Patrick
Officer · 8.27K sh · $201,068
Aug 14
Caine Paul
Director · 7.50K sh · $187,500
Aug 10
Lam Rachel
Director · 10.00K sh · $241,600
Aug 10
Caine Paul
Director · 5.00K sh · $121,750
Aug 10
Gephart Brian
Officer · 12.48K sh · $307,982
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Aug 13
SC 13G/A — WELLINGTON MANAGEMENT GROUP LLP
Aug 06
SC 13G — FMR LLC
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q4 2025 ·
Methodology ·
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