Magnite, Inc.
MGNI- Exchange
- Nasdaq
- Industry
- Services-Computer Programming, Data Processing, Etc.
- SEC CIK
- 0001595974
In the last 90 days, Magnite, Inc. insiders filed 0 open-market purchases and 26 sales; 311 institutions reported holding it in 13F filings for Q2 2026, worth $2.69B in total; no superinvestor holds it.
Holders of 5% or more of MGNI
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Magnite, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Vanguard Portfolio Management LLC | 13G | 5.43%7.85M shares | New | Apr 29, 20261 filing | Apr 29, 2026 | SEC |
| FMR LLC | 13G | 5.40%7.76M shares | +2.30 ppfrom 3.10% | Feb 9, 20229 filings | Aug 6, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 5.04%7.28M shares | New | Apr 30, 20261 filing | Apr 30, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
35 Schedule 13D and 13G filings on Magnite, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 13, 20264:13 PM ET | Wellington Management Group LLPand 2 others | 13G/A | 4.20%6.04M shares | −1.80 ppfrom 6.00%Below 5% | Jun 30, 2026 | SEC |
| Aug 6, 202610:31 AM ET | FMR LLCand 1 other | 13G | 5.40%7.76M shares | +2.30 ppfrom 3.10% | Jun 30, 2026 | SEC |
| May 14, 202610:19 AM ET | Capital Research Global Investors | 13G/A | 3.50%5.02M shares | −5.50 ppfrom 9.00%Below 5% | Mar 31, 2026 | SEC |
| May 6, 202611:30 AM ET | FMR LLCand 1 other | 13G/A | 3.10%4.51M shares | −2.60 ppfrom 5.70%Below 5% | Mar 31, 2026 | SEC |
| Apr 30, 202611:00 AM ET | Vanguard Capital Management LLC | 13G | 5.04%7.28M shares | New | Mar 31, 2026 | SEC |
| Apr 29, 20262:15 PM ET | Vanguard Portfolio Management LLC | 13G | 5.43%7.85M shares | New | Mar 31, 2026 | SEC |
| Mar 27, 202610:30 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −10.29 ppfrom 10.29%Below 5% | Mar 13, 2026 | SEC |
| Feb 12, 202610:25 AM ET | Capital Research Global Investors | 13G | 9.00%12.9M shares | +4.10 ppfrom 4.90% | Dec 31, 2025 | SEC |
| Feb 10, 202611:21 AM ET | Wellington Management Group LLPand 3 others | 13G | 6.00%8.63M shares | New | Dec 31, 2025 | SEC |
| Dec 5, 20252:03 PM ET | FMR LLCand 1 other | 13G/A | 5.70%8.12M shares | −6.50 ppfrom 12.20% | Nov 28, 2025 | SEC |
| Nov 13, 202510:29 AM ET | Capital Research Global Investors | 13G/A | 4.90%6.98M shares | −4.10 ppfrom 9.00%Below 5% | Sep 30, 2025 | SEC |
| Oct 6, 20255:18 PM ET | Vanguard Group Inc | 13G/A | 10.29%14.7M shares | – | Sep 30, 2025 | SEC |
| Jul 8, 20259:07 AM ET | FMR LLCand 1 other | 13G/A | 12.20%17.2M shares | +5.40 ppfrom 6.80% | Jun 30, 2025 | SEC |
| May 13, 202511:32 AM ET | Capital Research Global Investors | 13G/A | 9.00%12.9M shares | +3.50 ppfrom 5.50% | Mar 31, 2025 | SEC |
| May 12, 202510:36 AM ET | FMR LLCand 1 other | 13G | 6.80%9.72M shares | – | Mar 31, 2025 | SEC |
| Feb 13, 20252:14 PM ET | Capital Research Global Investors | 13G | 5.50%7.73M shares | New | Dec 31, 2024 | SEC |
| Nov 12, 2024 | RTL Group GmbH | 13G/AOld format | – | – | – | SEC |
| Nov 12, 2024 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Granahan Investment Management Inc | 13G/AOld format | – | – | – | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | FMR LLC | 13GOld format | – | – | – | SEC |
| Jan 26, 20244:23 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jul 14, 2023 | Edenbrook Capital, LLC | 13D/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Granahan Investment Management Inc | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Jan 31, 20235:52 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Nov 10, 2022 | Edenbrook Capital, LLC | 13DOld format | – | New | – | SEC |
| Feb 14, 2022 | Granahan Investment Management Inc | 13GOld format | – | New | – | SEC |
| Feb 10, 2022 | Vanguard Group Inc | 13GOld format | – | New | – | SEC |
| Feb 9, 2022 | FMR LLC | 13GOld format | – | New | – | SEC |
| Feb 3, 20224:41 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| May 21, 2021 | RTL Group GmbH | 13G/AOld format | – | – | – | SEC |
| May 10, 2021 | Bertelsmann SE & Co. KGaA | 13GOld format | – | New | – | SEC |
| Jan 29, 20215:21 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Magnite, Inc. shares.
No Form 144 notices for Magnite, Inc. are on file.