Security key
55955D100
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 799,953
- Total 13F value
- $15,183,109
- Share change
- -132,961
- SEC-reported price per share
- $18.98
- Number of holders
- 9
- Value change
- -$2,523,600
- Number of buys
- 3
- Number of sells
- 3
- Shares outstanding
- 143,436,829
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
9
Top holders
9
MGNI full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q1 2026
MAGNITE, INC. SEC filings
MAGNITE, INC. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 55955D100
Recent filing periods:
Ownership snapshot
Top reported holders of MGNI - MAGNITE, INC. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
WELLINGTON MANAGEMENT GRO...
Disclosed value leader
WELLINGTON MANAGEMENT GRO...
Comparable rows
15/15
Latest evidence
17 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 6%
13D/G row: WELLINGTON MANAGEMENT GROUP LLP
Showing 1-6 of 15 holder rows.
Quick read
WELLINGTON MANAGEMENT GROUP LLP leads the comparable SEC ownership view at 6%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens WELLINGTON MANAGEMENT GROUP LLP's linked filing trail.
Comparable ownership
Top 5
WELLINGTON MANAGEMENT GROUP LLP
6%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.4%
VANGUARD CAPITAL MANAGEMENT LLC
5%
Capital Research Global Investors
3.5%
FMR LLC
3.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
Company
|
6%
|
$138,844,439
8,629,238 shares
|
$0 | 31 Dec 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.4%
|
$93,256,456
7,849,870 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5%
|
$86,525,949
7,283,329 shares
|
$0 | 31 Mar 2026 |
| Capital Research Global Investors |
13D/G
13F
Company
|
3.5%
|
$60,695,294
5,020,289 shares
|
-$95,511,000 | 31 Mar 2026 |
| FMR LLC |
13D/G
13F
Company
|
3.1%
|
$54,494,691
4,507,419 shares
|
-$43,735,587 | 31 Mar 2026 |
| Katie Seitz Evans |
3/4/5
President, Operations
|
0.35%
|
$6,609,081
496,840 shares
mixed-class rows
|
-$1,015,995 | 15 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
9
Shares
799,953
Rows available
9
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
296
Q2 2026 holders
9
Holder diff
-287
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend