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 |
|---|---|---|---|---|---|---|
| Q3 2026 | 2 | -1 | 24.50K | $623,529 | n/a | −1 |
| 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 | n/a | −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 | n/a | −1 |
| Q4 2024 | 12 | +1 | 14.99M | $238.72M | +1 | n/a |
| Q3 2024 | 10 | 0 | 14.78M | $204.65M | n/a | n/a |
| Q2 2024 | 10 | n/a | 8.59M | $114.16M | n/a | n/a |
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 ↗ ×5 |
| 2 | Capital Research Global Investors | 12.92M | n/a | $209.70M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 11.59M | +1.6% | $188.16M | 0.0% | ▲ Add | 3 | SEC ↗ ×17 |
| 4 | Wellington Management ✦ | 8.63M | +67.7% | $140.05M | 0.0% | ▲ Add | 7 | SEC ↗ ×7 |
| 5 | Fidelity (FMR) ✦ | 6.70M | -60.9% | $108.76M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 6 | American Century Companies Inc | 5.29M | n/a | $85.81M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | Boston Partners | 4.11M | n/a | $66.60M | 0.1% | n/c | 1 | SEC ↗ ×3 |
| 8 | Dimensional Fund Advisors Lp | 3.62M | n/a | $58.69M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 9 | Nuveen, LLC | 3.53M | n/a | $57.31M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 10 | Geode Capital Management ✦ (passive) | 3.43M | +1.0% | $55.74M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 11 | State Street Global Advisors ✦ (passive) | 3.14M | +0.5% | $50.99M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 12 | Morgan Stanley ✦ | 1.86M | -9.0% | $30.23M | 0.0% | ▼ Trim | 2 | SEC ↗ ×7 |
| 13 | Goldman Sachs Group ✦ | 1.76M | -26.2% | $28.58M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 14 | Northern Trust Corp | 1.27M | n/a | $20.65M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 15 | Charles Schwab Investment… | 1.19M | n/a | $19.27M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | Bank of New York Mellon Corp | 1.18M | n/a | $19.21M | 0.0% | n/c | 1 | SEC ↗ ×11 |
| 17 | Balyasny Asset Management L.P. | 873.21K | n/a | $14.17M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | T. Rowe Price ✦ | 711.50K | -72.1% | $11.55M | 0.0% | ▼ Trim | 7 | SEC ↗ ×2 |
| 19 | Bank Of America Corp /De/ | 651.95K | n/a | $10.58M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 20 | Nomura Asset Management Co Ltd | 622.70K | n/a | $10.11M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Citadel Advisors ✦ | 544.32K | +221.0% | $8.83M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 22 | JPMorgan Chase ✦ | 506.39K | -79.1% | $8.22M | 0.0% | ▼ Trim | 2 | SEC ↗ ×4 |
| 23 | New York State Common Retirement… | 474.46K | n/a | $7.70M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Nordea Investment Management Ab | 445.02K | n/a | $7.34M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 25 | Russell Investments Group, Ltd. | 451.02K | n/a | $7.32M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 26 | UBS Group AG | 404.01K | n/a | $6.56M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 27 | Jane Street Group, Llc | 380.25K | n/a | $6.17M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 28 | Barclays Plc | 366.39K | n/a | $5.95M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 29 | Two Sigma Investments ✦ | 363.41K | +21.0% | $5.90M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 30 | UBS AM, a distinct business unit of… | 328.26K | n/a | $5.33M | 0.0% | n/c | 1 | SEC ↗ ×9 |
| 31 | Man Group plc | 311.54K | n/a | $5.06M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 32 | Susquehanna International Group, Llp | 307.61K | n/a | $4.99M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Raymond James Financial Inc | 297.72K | n/a | $4.83M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 34 | First Eagle Investment Management… | 296.44K | n/a | $4.81M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Swiss National Bank | 280.70K | n/a | $4.56M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Bank Of Montreal /Can/ | 276.27K | n/a | $4.48M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 37 | Simplex Trading, Llc | 263.36K | n/a | $4.27M | 0.1% | n/c | 1 | SEC ↗ |
| 38 | Commonwealth Equity Services, Llc | 254.32K | n/a | $4.13M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Invesco Ltd. | 243.56K | n/a | $3.95M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 40 | Principal Financial Group Inc | 237.22K | n/a | $3.85M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 41 | Voya Investment Management Llc | 220.44K | n/a | $3.58M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 42 | State Of Wisconsin Investment Board | 219.56K | n/a | $3.56M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Sei Investments Co | 211.54K | n/a | $3.43M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 44 | Qube Research & Technologies Ltd | 202.94K | n/a | $3.29M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | First Trust Advisors Lp | 199.87K | n/a | $3.24M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Wells Fargo & Company/Mn | 193.62K | n/a | $3.14M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 47 | Rhumbline Advisers | 183.94K | n/a | $2.99M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Federated Hermes, Inc. | 172.95K | n/a | $2.81M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Envestnet Asset Management Inc | 163.95K | n/a | $2.66M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Victory Capital Management Inc | 151.08K | n/a | $2.45M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Legal & General Group Plc | 148.84K | n/a | $2.42M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 52 | Bridgewater Associates ✦ | 145.19K | -0.3% | $2.36M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 53 | California State Teachers… | 136.52K | n/a | $2.22M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | IMC-Chicago, LLC | 133.10K | n/a | $2.16M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Universal- Beteiligungs- und… | 129.79K | n/a | $2.11M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Deutsche Bank Ag\ | 128.47K | n/a | $2.09M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 57 | Alliancebernstein L.P. | 125.34K | n/a | $2.03M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | Tidal Investments LLC | 123.91K | n/a | $2.01M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | LPL Financial LLC | 116.45K | n/a | $1.89M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Franklin Resources Inc | 108.97K | n/a | $1.77M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 61 | Hsbc Holdings Plc | 105.57K | n/a | $1.71M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 62 | Cerity Partners LLC | 100.79K | n/a | $1.64M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 63 | AQR Capital Management ✦ | 97.53K | +102.9% | $1.58M | 0.0% | ▲ Add | 5 | SEC ↗ ×5 |
| 64 | Manufacturers Life Insurance… | 65.59K | n/a | $1.06M | 0.0% | n/c | 1 | SEC ↗ |
| 65 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 65.00K | n/a | $1.05M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Royal Bank Of Canada | 62.31K | n/a | $1.01M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 67 | Stifel Financial Corp | 58.78K | n/a | $954,034 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 68 | Janus Henderson Group Plc | 58.42K | n/a | $948,497 | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Parallax Volatility Advisers, L.P. | 54.66K | n/a | $887,099 | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Zurcher Kantonalbank (Zurich… | 53.37K | n/a | $866,163 | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Walleye Trading LLC | 52.87K | n/a | $858,031 | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Quantinno Capital Management LP | 52.45K | n/a | $851,215 | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Citigroup Inc | 51.42K | n/a | $834,612 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 74 | Squarepoint Ops LLC | 45.44K | n/a | $737,459 | 0.0% | n/c | 1 | SEC ↗ |
| 75 | GAMCO Investors ✦ | 44.48K | -21.2% | $721,894 | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 76 | State Board Of Administration Of… | 38.23K | n/a | $620,489 | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Allspring Global Investments… | 37.46K | n/a | $601,640 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 78 | Tudor Investment Corp Et Al | 34.67K | n/a | $562,759 | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Cetera Investment Advisers | 34.30K | n/a | $556,640 | 0.0% | n/c | 1 | SEC ↗ |
| 80 | Bnp Paribas Financial Markets | 31.63K | n/a | $513,387 | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Creative Planning | 30.73K | n/a | $498,835 | 0.0% | n/c | 1 | SEC ↗ |
| 82 | Marshall Wace ✦ | 28.76K | +127.4% | $466,824 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 83 | ProShare Advisors LLC | 25.58K | n/a | $415,212 | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Millennium Management ✦ | 23.74K | -96.5% | $385,365 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 85 | Pictet Asset Management Holding SA | 22.64K | n/a | $367,463 | 0.0% | n/c | 1 | SEC ↗ |
| 86 | Truist Financial Corp | 21.28K | n/a | $345,439 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 87 | Brown Advisory Inc | 21.26K | n/a | $345,098 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 88 | Canada Pension Plan Investment Board | 18.45K | n/a | $299,476 | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Osaic Holdings, Inc. | 16.53K | n/a | $268,260 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 90 | Holocene Advisors, LP | 15.56K | n/a | $252,571 | 0.0% | n/c | 1 | SEC ↗ |
| 91 | Captrust Financial Advisors | 15.33K | n/a | $248,790 | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Ensign Peak Advisors, Inc | 13.66K | n/a | $221,669 | 0.0% | n/c | 1 | SEC ↗ |
| 93 | Amundi | 13.05K | n/a | $211,850 | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Rockefeller Capital Management L.P. | 8.40K | n/a | $136,364 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 95 | Jones Financial Companies Lllp | 5.49K | n/a | $89,119 | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Group One Trading Llc | 5.35K | n/a | $86,782 | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Northwestern Mutual Wealth… | 3.20K | n/a | $51,952 | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Cwm, Llc | 2.58K | n/a | $42,000 | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Pnc Financial Services Group, Inc. | 1.83K | n/a | $29,766 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 100 | Us Bancorp \De\ | 1.13K | n/a | $18,405 | 0.0% | n/c | 1 | SEC ↗ ×2 |
“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)
Oct 12
Caine Paul
Director · 12.50K sh · $316,125
Sep 17
Knopper Douglas S
Director · 37.34K sh · $981,216
Sep 17
Caine Paul
Director · 7.50K sh · $198,750
Sep 14
Spillane Robert F
Director · 10.36K sh · $246,225
Sep 14
Buonasera David
Officer · 1.17K sh · $27,960
Sep 11
Evans Katie Seitz
Officer · 14.00K sh · $335,928
Sep 10
Caine Paul
Director · 5.00K sh · $117,650
Sep 10
Saltz Aaron
Officer · 40.00K sh · $936,400
Sep 09
Evans Katie Seitz
Officer · 11.10K sh · $260,406
Sep 08
Evans Katie Seitz
Officer · 32.28K sh · $762,895
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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