Security key
55955D100
- Type / Class
- Equity / Common Stock
- Shares outstanding
- 143,436,829
- Total 13F shares
- 138,012,684
- Share change
- -9,036,178
- Total reported value
- $3,003,860,929
- Put/Call ratio
- 74%
- Price per share
- $21.78
- Number of holders
- 313
- Value change
- -$207,225,719
- Number of buys
- 148
- Number of sells
- 165
Report period
Q3 2025
Institutions
313
Top holders
10
MGNI full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q4 2025
Previous quarter: Q2 2025
MAGNITE, INC. SEC filings
MAGNITE, INC. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 55955D100
Recent filing periods:
Ownership snapshot
Top shareholders 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.
Lead holder
Rachel Lam
13D/G signal
—
Evidence rows
50
Latest as of
26 Aug 2025
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Rachel Lam |
3/4/5
Director
|
0.16%
|
$5,046,789
226,822 shares
|
-$333,750 | 12 Aug 2025 |
| Douglas S. Knopper |
3/4/5
Director
|
0.11%
|
$2,611,475
160,115 shares
|
— | 05 Jun 2025 |
| Sarah Patricia Harden |
3/4/5
Director
|
0.1%
|
$2,445,505
149,939 shares
|
— | 05 Jun 2025 |
| James Rossman |
3/4/5
Director
|
0.07%
|
$1,759,291
93,679 shares
|
-$2,572,991 | 18 Jun 2025 |
| Pearson David T. |
3/4/5
Director
|
0.05%
|
$1,337,054
75,969 shares
|
-$202,611 | 05 Jun 2025 |
| Diane Yu |
3/4/5
Director
|
0.05%
|
$1,702,545
67,481 shares
|
-$504,600 | 26 Aug 2025 |
| FMR LLC |
13F
Company
|
12%
|
$414,524,847
17,185,939 shares
|
— | 30 Jun 2025 |
| VANGUARD GROUP INC |
13F
Company
|
9.5%
|
$327,122,315
13,562,285 shares
|
— | 30 Jun 2025 |
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 Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
313
Shares
138,012,684
Rows loaded
315
| Investor | Option | Weight % | Change % | Reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* 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. An asterisk next to the price means the price is likely invalid.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
285
Q3 2025 holders
313
Holder diff
28
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend