Security record · archived quarter
MGNI
Magnite, Inc. · Communication Services · Advertising Agencies
107Tracked holders
+5Δ holders
86.26MShares held
$1.03BReported value
+8New positions
−3Exits
Momentum inputs (comparable managers):
holder breadth +4.9% ·
share flow -5.2% ·
net new positions +4.7%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 101 | -1 | 92.35M | $1.75B | +9 | −12 |
| 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 · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 11.66M | +0.6% | $138.49M | 0.0% | ▲ Add | 4 | SEC ↗ ×15 |
| 2 | Wellington Management ✦ | 9.19M | +6.5% | $109.19M | 0.0% | ▲ Add | 8 | SEC ↗ ×5 |
| 3 | Vanguard Capital Management Llc | 6.19M | — | $73.54M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | Capital Research Global Investors | 5.02M | -61.1% | $59.64M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | Boston Partners | 4.72M | +14.9% | $56.08M | 0.1% | ▲ Add | 2 | SEC ↗ ×3 |
| 6 | American Century Companies Inc | 4.63M | -12.5% | $54.97M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 7 | Fidelity (FMR) ✦ | 4.51M | -32.7% | $53.55M | 0.0% | ▼ Trim | 4 | SEC ↗ ×3 |
| 8 | Dimensional Fund Advisors Lp | 3.98M | +10.2% | $47.32M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 9 | Nuveen, LLC | 3.59M | +1.7% | $42.65M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 10 | Geode Capital Management ✦ (passive) | 3.55M | +3.5% | $42.23M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 11 | State Street Global Advisors ✦ (passive) | 3.16M | +0.7% | $37.58M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 12 | Jane Street Group, Llc | 1.67M | +338.7% | $19.82M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 13 | Goldman Sachs Group ✦ | 1.50M | -14.8% | $17.83M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 14 | Balyasny Asset Management L.P. | 1.50M | +71.8% | $17.83M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 15 | Northern Trust Corp | 1.32M | +4.0% | $15.71M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 16 | Victory Capital Management Inc | 1.27M | +738.3% | $15.05M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | Millennium Management ✦ | 1.23M | +5099.0% | $14.67M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | Charles Schwab Investment… | 1.18M | -0.6% | $14.02M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 19 | Bank of New York Mellon Corp | 1.14M | -3.8% | $13.52M | 0.0% | ▼ Trim | 2 | SEC ↗ ×10 |
| 20 | Bank Of America Corp /De/ | 1.13M | +72.6% | $13.37M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 21 | Citadel Advisors ✦ | 1.05M | +93.4% | $12.51M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 22 | Morgan Stanley ✦ | 926.82K | -50.2% | $11.01M | 0.0% | ▼ Trim | 3 | SEC ↗ ×8 |
| 23 | Man Group plc | 663.96K | +113.1% | $7.89M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 24 | Qube Research & Technologies Ltd | 661.06K | +225.8% | $7.85M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 25 | Nomura Asset Management Co Ltd | 593.90K | -4.6% | $7.06M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 26 | Pacer Advisors, Inc. | 501.58K | New | $5.96M | 0.0% | New | 1 | SEC ↗ |
| 27 | JPMorgan Chase ✦ | 486.87K | -3.9% | $5.63M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 28 | Capital World Investors ✦ | 456.67K | New | $5.43M | 0.0% | New | 1 | SEC ↗ |
| 29 | UBS Group AG | 450.35K | +11.5% | $5.35M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 30 | First Eagle Investment Management… | 450.29K | +51.9% | $5.35M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | Principal Financial Group Inc | 445.95K | +88.0% | $5.30M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 32 | Nordea Investment Management Ab | 421.01K | -5.4% | $4.90M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 33 | Two Sigma Investments ✦ | 394.86K | +8.7% | $4.69M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 34 | Commonwealth Equity Services, Llc | 359.57K | +41.4% | $4.27M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 35 | Sei Investments Co | 350.86K | +65.9% | $4.17M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 36 | UBS AM, a distinct business unit of… | 323.02K | -1.6% | $3.84M | 0.0% | ▼ Trim | 2 | SEC ↗ ×9 |
| 37 | Susquehanna International Group, Llp | 307.81K | +0.1% | $3.66M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 38 | Alliancebernstein L.P. | 223.19K | +78.1% | $3.62M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 39 | Squarepoint Ops LLC | 300.93K | +562.3% | $3.58M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 40 | Raymond James Financial Inc | 291.71K | -2.0% | $3.47M | 0.0% | ▼ Trim | 2 | SEC ↗ ×4 |
| 41 | Swiss National Bank | 284.30K | +1.3% | $3.38M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 42 | Invesco Ltd. | 261.37K | +7.3% | $3.11M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 43 | Voya Investment Management Llc | 210.57K | -4.5% | $2.50M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 44 | State Of Wisconsin Investment Board | 185.47K | -15.5% | $2.20M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 45 | Barclays Plc | 180.65K | -50.7% | $2.15M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 46 | Rhumbline Advisers | 179.98K | -2.2% | $2.14M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 47 | Walleye Trading LLC | 179.39K | +239.3% | $2.13M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 48 | California State Teachers… | 176.53K | +29.3% | $2.10M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 49 | T. Rowe Price ✦ | 165.44K | -76.8% | $1.97M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 50 | LPL Financial LLC | 155.44K | +33.5% | $1.85M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Deutsche Bank Ag\ | 139.64K | +8.7% | $1.66M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 52 | Tidal Investments LLC | 133.76K | +8.0% | $1.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 53 | Quantinno Capital Management LP | 128.13K | +144.3% | $1.52M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 54 | Legal & General Group Plc | 122.05K | -18.0% | $1.45M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 55 | AQR Capital Management ✦ | 121.21K | +24.3% | $1.44M | 0.0% | ▲ Add | 6 | SEC ↗ ×5 |
| 56 | Franklin Resources Inc | 109.58K | +0.6% | $1.30M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 57 | Holocene Advisors, LP | 101.97K | +555.3% | $1.21M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 58 | Cerity Partners LLC | 101.21K | +0.4% | $1.20M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 59 | Envestnet Asset Management Inc | 78.26K | -52.3% | $929,753 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 60 | Tudor Investment Corp Et Al | 73.64K | +112.4% | $874,903 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 61 | Creative Planning | 72.18K | +134.8% | $857,479 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 62 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 66.73K | +2.7% | $792,800 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 63 | Wells Fargo & Company/Mn | 66.10K | -65.9% | $785,292 | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 64 | Zurcher Kantonalbank (Zurich… | 64.71K | +21.2% | $768,719 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 65 | Manufacturers Life Insurance… | 64.56K | -1.6% | $766,949 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 66 | GAMCO Investors ✦ | 60.65K | +36.4% | $720,558 | 0.0% | ▲ Add | 8 | SEC ↗ |
| 67 | Fifth Third Bancorp | 58.82K | New | $698,818 | 0.0% | New | 1 | SEC ↗ |
| 68 | Janus Henderson Group Plc | 58.42K | 0.0% | $693,773 | 0.0% | Held | 2 | SEC ↗ |
| 69 | Jennison Associates Llc | 57.85K | New | $687,246 | 0.0% | New | 1 | SEC ↗ |
| 70 | Royal Bank Of Canada | 52.92K | -15.1% | $628,000 | 0.0% | ▼ Trim | 2 | SEC ↗ ×5 |
| 71 | Russell Investments Group, Ltd. | 49.10K | -89.1% | $583,283 | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 72 | Stifel Financial Corp | 46.60K | -20.7% | $553,617 | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 73 | Canada Pension Plan Investment Board | 46.05K | +149.6% | $547,098 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 74 | Marshall Wace ✦ | 42.47K | +47.6% | $504,520 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 75 | Allspring Global Investments… | 41.77K | +11.5% | $492,421 | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 76 | Hsbc Holdings Plc | 38.40K | -63.6% | $459,556 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 77 | State Board Of Administration Of… | 38.23K | 0.0% | $454,184 | 0.0% | Held | 2 | SEC ↗ |
| 78 | New York State Common Retirement… | 36.73K | -92.3% | $436,293 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 79 | Brown Advisory Inc | 31.52K | +48.3% | $374,505 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 80 | Bnp Paribas Financial Markets | 31.46K | -0.5% | $373,792 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 81 | IMC-Chicago, LLC | 27.77K | -79.1% | $329,955 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 82 | Pictet Asset Management Holding SA | 25.75K | +13.8% | $305,969 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 83 | Group One Trading Llc | 25.00K | +367.5% | $296,988 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 84 | Universal- Beteiligungs- und… | 23.70K | -81.7% | $281,496 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 85 | Amundi | 22.82K | +74.8% | $271,066 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 86 | Prudential Financial Inc | 22.45K | New | $266,730 | 0.0% | New | 1 | SEC ↗ |
| 87 | ProShare Advisors LLC | 20.63K | -19.4% | $245,061 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 88 | Captrust Financial Advisors | 18.66K | +21.7% | $221,657 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 89 | Mercer Global Advisors Inc /Adv | 18.46K | New | $219,281 | 0.0% | New | 1 | SEC ↗ |
| 90 | Citigroup Inc | 15.86K | -69.2% | $188,417 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 91 | Ensign Peak Advisors, Inc | 13.66K | 0.0% | $162,257 | 0.0% | Held | 2 | SEC ↗ |
| 92 | Cetera Investment Advisers | 13.16K | -61.6% | $156,305 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 93 | Parallax Volatility Advisers, L.P. | 13.13K | -76.0% | $156,020 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 94 | Gotham Asset Management ✦ | 12.88K | New | $153,074 | 0.0% | New | 1 | SEC ↗ |
| 95 | Truist Financial Corp | 12.08K | -43.3% | $143,463 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 96 | Simplex Trading, Llc | 11.32K | -95.7% | $134,434 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 97 | Osaic Holdings, Inc. | 9.71K | -41.2% | $115,388 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 98 | Cwm, Llc | 7.02K | +171.8% | $83,350 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 99 | Jones Financial Companies Lllp | 7.06K | +28.6% | $82,296 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 100 | Optiver Holding B.V. | 5.58K | +2746.4% | $66,279 | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Pacer Advisors, Inc. | $5.96M | 0.0% |
| Capital World Investors | $5.43M | 0.0% |
| Fifth Third Bancorp | $698,818 | 0.0% |
| Jennison Associates Llc | $687,246 | 0.0% |
| Prudential Financial Inc | $266,730 | 0.0% |
| Mercer Global Advisors Inc… | $219,281 | 0.0% |
| Gotham Asset Management | $153,074 | 0.0% |
Exited
| Bank Of Montreal /Can/ | $4.48M | was 0.0% |
| First Trust Advisors Lp | $3.24M | was 0.0% |
| Bridgewater Associates | $2.36M | 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)
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
Sep 02
Buonasera David
Officer · 1.04K sh · $26,075
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: Q1 2026 ·
Methodology ·
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