Magnite, Inc. (MGNI)
Nasdaq: MGNI · Services-Computer Programming, Data Processing, Etc. · New York, NY · filing with the SEC since 2014
Grade5.6
◀ Past 5.1● Present 6.0▶ Future 5.6
Who owns Magnite, Inc.
As filed with the SECHolders of 5% or more
3
Vanguard Portfolio Management holds 5.43% of Common Stock, as its SCHEDULE 13G filed Apr 29, 2026 says.
Directors and officers
17
report now, of 35 people on the record since 2014. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 3 named at left.
Holders of 5% or moreshare of the class, as filed
Vanguard Portfolio Management
SCHEDULE 13G · filed Apr 29, 2026 · Common Stock
Fmr LLC
SCHEDULE 13G · filed Aug 6, 2026 · COMMON STOCK · 3.1% in May 6, 2026
Vanguard Capital Management
SCHEDULE 13G · filed Apr 30, 2026 · Common Stock
Wellington Management Group LLP
SCHEDULE 13G/A · filed Aug 13, 2026 · Common Stock · reported falling below 5%, from 6% in Feb 10, 2026
Capital Research Global Investors
SCHEDULE 13G/A · filed May 14, 2026 · Common Stock · reported falling below 5%, from 9% in Feb 12, 2026
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%, from 10.3% in Oct 6, 2025
What MGNI reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Streamrai, Inc.
A company bought · acquisition · Sep 2025 · owns, named in the 10-K filed Feb 25, 2026
SpotX and Telaria
A company bought · acquisition · owns, named in the 10-K filed Feb 25, 2026
Insider tradesForm 4
60sales
0purchases
50sales on a scheduled plan
15people selling
$30.0Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Nov 12, 2025 to Nov 12, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Nov 12, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window15 of 35 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Barrett Michael G. | CEO | 5 | $13.6M | 5 | 0 | $0 |
| Buckley Sean Patrick | See Remarks | 9 | $3.1M | 9 | 0 | $0 |
| Knopper Douglas S | director | 4 | $2.7M | 4 | 0 | $0 |
| Evans Katie Seitz | See Remarks | 5 | $2.6M | 4 | 0 | $0 |
| Rossman James | director | 1 | $1.4M | 0 | 0 | $0 |
| Saltz Aaron | CHIEF LEGAL OFFICER | 2 | $1.2M | 1 | 0 | $0 |
| Harden Sarah Patricia | director | 2 | $1.2M | 2 | 0 | $0 |
| Buonasera David | CHIEF TECHNOLOGY OFFICER | 15 | $1.0M | 15 | 0 | $0 |
| Caine Paul | director | 6 | $1.0M | 6 | 0 | $0 |
| Soroca Adam Lee | CHIEF PRODUCT OFFICER | 3 | $700,000 | 3 | 0 | $0 |
| Spillane Robert F | director | 3 | $600,000 | 0 | 0 | $0 |
| Gephart Brian | CHIEF FINANCIAL OFFICER | 2 | $400,000 | 0 | 0 | $0 |
| Lam Rachel | director | 1 | $200,000 | 0 | 0 | $0 |
| Pearson David T. | director | 1 | $200,000 | 1 | 0 | $0 |
| Sullivan Haas | CHIEF ACCOUNTING OFFICER | 1 | $100,000 | 0 | 0 | $0 |