MGNI
Magnite, Inc. · Communication Services · Advertising Agencies
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2024
| 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 | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 2.92M | — | $38.81M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 2 | Geode Capital Management ✦ (passive) | 2.90M | — | $38.61M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 3 | Marshall Wace ✦ | 1.56M | — | $20.73M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 4 | Norges Bank ✦ (passive) | 572.40K | — | $7.61M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | Citadel Advisors ✦ | 289.46K | — | $3.85M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | Two Sigma Investments ✦ | 139.14K | — | $1.85M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | T. Rowe Price ✦ | 84.63K | — | $1.12M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | GAMCO Investors ✦ | 44.46K | — | $590,834 | 0.0% | n/c | 1 | SEC ↗ |
| 9 | D. E. Shaw & Co. ✦ | 41.10K | — | $546,179 | 0.0% | n/c | 1 | SEC ↗ |
| 10 | Millennium Management ✦ | 33.72K | — | $448,112 | 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
| No tracked exits this quarter. |
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.
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)
Director · 37.34K sh · $981,216
Director · 7.50K sh · $198,750
Director · 10.36K sh · $246,225
Officer · 1.17K sh · $27,960
Officer · 14.00K sh · $335,928
Director · 5.00K sh · $117,650
Officer · 40.00K sh · $936,400
Officer · 11.10K sh · $260,406
Officer · 32.28K sh · $762,895
Officer · 1.04K sh · $26,075
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology