Security record
MGNI
Magnite, Inc. · Communication Services · Advertising Agencies
103Tracked holders
-1Δ holders
93.04MShares held
$1.77BReported value
+9New positions
−10Exits
Momentum inputs (comparable managers):
holder breadth -1.0% ·
share flow +8.2% ·
net new positions -1.0%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
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 · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 12.71M | +9.1% | $241.30M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 16 | Fidelity (FMR) ✦ | 7.76M | +72.2% | $147.27M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 17 | Fidelity (FMR) ✦ | 7.76M | +72.2% | $147.27M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 7.76M | +72.2% | $147.27M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 19 | Fidelity (FMR) ✦ | 7.76M | +72.2% | $147.27M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 20 | Vanguard Capital Management Llc | 6.23M | +0.6% | $118.15M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | Wellington Management ✦ | 6.04M | -34.2% | $114.72M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 22 | Wellington Management ✦ | 6.04M | -34.2% | $114.72M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 23 | Wellington Management ✦ | 6.04M | -34.2% | $114.72M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 24 | Wellington Management ✦ | 6.04M | -34.2% | $114.72M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 25 | Wellington Management ✦ | 6.04M | -34.2% | $114.72M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 26 | Dimensional Fund Advisors Lp | 5.26M | +32.0% | $99.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 27 | Dimensional Fund Advisors Lp | 5.26M | +32.0% | $99.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 28 | Dimensional Fund Advisors Lp | 5.26M | +32.0% | $99.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | Dimensional Fund Advisors Lp | 5.26M | +32.0% | $99.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 30 | Dimensional Fund Advisors Lp | 5.26M | +32.0% | $99.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 31 | Boston Partners | 5.01M | +6.2% | $95.85M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 32 | Boston Partners | 5.01M | +6.2% | $95.85M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 33 | Boston Partners | 5.01M | +6.2% | $95.85M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 34 | American Century Companies Inc | 4.62M | -0.1% | $87.74M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 35 | Capital Research Global Investors | 3.87M | -22.9% | $73.44M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 36 | Nuveen, LLC | 3.79M | +5.7% | $72.03M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 37 | Nuveen, LLC | 3.79M | +5.7% | $72.03M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 38 | Nuveen, LLC | 3.79M | +5.7% | $72.03M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | Geode Capital Management ✦ (passive) | 3.79M | +6.7% | $71.95M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 40 | Geode Capital Management ✦ (passive) | 3.79M | +6.7% | $71.95M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 41 | State Street Global Advisors ✦ (passive) | 3.53M | +11.5% | $66.96M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 42 | Canada Pension Plan Investment Board | 3.00M | +6403.7% | $56.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 43 | Jane Street Group, Llc | 2.20M | +31.8% | $41.74M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 44 | Jane Street Group, Llc | 2.20M | +31.8% | $41.74M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 46 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 47 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 48 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 1.99M | +114.9% | $37.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 52 | Qube Research & Technologies Ltd | 1.96M | +195.9% | $37.12M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 53 | Northern Trust Corp | 1.55M | +17.4% | $29.48M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 54 | Northern Trust Corp | 1.55M | +17.4% | $29.48M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 55 | Northern Trust Corp | 1.55M | +17.4% | $29.48M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 56 | Northern Trust Corp | 1.55M | +17.4% | $29.48M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 57 | Northern Trust Corp | 1.55M | +17.4% | $29.48M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 58 | Goldman Sachs Group ✦ | 1.47M | -2.3% | $27.84M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 59 | Goldman Sachs Group ✦ | 1.47M | -2.3% | $27.84M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 60 | Victory Capital Management Inc | 1.24M | -2.5% | $23.45M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 61 | Charles Schwab Investment… | 1.20M | +1.9% | $22.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 62 | Bank Of America Corp /De/ | 1.18M | +5.0% | $22.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 63 | Bank Of America Corp /De/ | 1.18M | +5.0% | $22.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 64 | Bank Of America Corp /De/ | 1.18M | +5.0% | $22.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 65 | Bank Of America Corp /De/ | 1.18M | +5.0% | $22.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 66 | Bank Of America Corp /De/ | 1.18M | +5.0% | $22.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 68 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 69 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 70 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 71 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 72 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 73 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 74 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Bank of New York Mellon Corp | 1.16M | +2.1% | $22.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | Millennium Management ✦ | 764.82K | -38.0% | $14.52M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 77 | UBS Group AG | 746.35K | +65.7% | $14.17M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 78 | UBS Group AG | 746.35K | +65.7% | $14.17M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 79 | UBS Group AG | 746.35K | +65.7% | $14.17M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 80 | First Eagle Investment Management… | 670.79K | +49.0% | $12.73M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 81 | Balyasny Asset Management L.P. | 666.55K | -55.6% | $12.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 82 | Ameriprise Financial Inc | 619.57K | New | $11.76M | 0.0% | New | 1 | SEC ↗ |
| 83 | Ameriprise Financial Inc | 619.57K | New | $11.76M | 0.0% | New | 1 | SEC ↗ |
| 84 | Ameriprise Financial Inc | 619.57K | New | $11.76M | 0.0% | New | 1 | SEC ↗ |
| 85 | Nomura Asset Management Co Ltd | 553.90K | -6.7% | $10.51M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 86 | Bank Of Montreal /Can/ | 533.76K | New | $10.13M | 0.0% | New | 1 | SEC ↗ |
| 87 | Bank Of Montreal /Can/ | 533.76K | New | $10.13M | 0.0% | New | 1 | SEC ↗ |
| 88 | Bank Of Montreal /Can/ | 533.76K | New | $10.13M | 0.0% | New | 1 | SEC ↗ |
| 89 | Bank Of Montreal /Can/ | 533.76K | New | $10.13M | 0.0% | New | 1 | SEC ↗ |
| 90 | Principal Financial Group Inc | 497.52K | +11.6% | $9.44M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 91 | Principal Financial Group Inc | 497.52K | +11.6% | $9.44M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | Citadel Advisors ✦ | 472.87K | -55.1% | $8.97M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 93 | Citadel Advisors ✦ | 472.87K | -55.1% | $8.97M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 94 | Susquehanna International Group, Llp | 461.85K | +50.0% | $8.77M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | JPMorgan Chase ✦ | 407.02K | -16.4% | $7.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 96 | JPMorgan Chase ✦ | 407.02K | -16.4% | $7.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 97 | JPMorgan Chase ✦ | 407.02K | -16.4% | $7.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 98 | JPMorgan Chase ✦ | 407.02K | -16.4% | $7.89M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 99 | Nordea Investment Management Ab | 386.33K | -8.2% | $7.38M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 100 | Nordea Investment Management Ab | 386.33K | -8.2% | $7.38M | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Ameriprise Financial Inc | $11.76M | 0.0% |
| Ameriprise Financial Inc | $11.76M | 0.0% |
| Ameriprise Financial Inc | $11.76M | 0.0% |
| Bank Of Montreal /Can/ | $10.13M | 0.0% |
| Bank Of Montreal /Can/ | $10.13M | 0.0% |
| Bank Of Montreal /Can/ | $10.13M | 0.0% |
| Bank Of Montreal /Can/ | $10.13M | 0.0% |
Exited
| Pacer Advisors, Inc. | $5.96M | was 0.0% |
| Capital World Investors | $5.43M | was 0.0% |
| Walleye Trading LLC | $2.13M | was 0.0% |
| Holocene Advisors, LP | $1.21M | was 0.0% |
| Tudor Investment Corp Et Al | $874,903 | was 0.0% |
| Jennison Associates Llc | $687,246 | was 0.0% |
| Group One Trading Llc | $296,988 | was 0.0% |
| Gotham Asset Management | $153,074 | was 0.0% |
| Simplex Trading, Llc | $134,434 | was 0.0% |
| Optiver Holding B.V. | $66,279 | 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: Q2 2026 ·
Methodology ·
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