MAGNITE, INC. - Common Stock (MGNI)

CUSIP: 55955D100

Q1 2026 13F Holders as of 31 Mar 2026

Security identity 2 facts
Security type / class
Equity / Common Stock
Shares outstanding
143,436,829
Holder snapshot 9 facts
Total 13F shares
131,062,977
Share change
-5,875,315
Total reported value
$1,557,738,570
Put/Call ratio
209%
Reported price per share
$11.88
Number of holders
295
Value change
-$97,684,848
Number of buys
158
Number of sells
133

Security key

55955D100

Report period

Q1 2026

Institutions

295

Top holders

10

MGNI full security history Ownership snapshot Full 13F holder table Previous quarter: Q4 2025 MAGNITE, INC. SEC filings MAGNITE, INC. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

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.

Lead holder
WELLINGTON MANAGEMENT GRO...
13D/G signal
WELLINGTON MANAGEMENT GRO...
Evidence rows
15
Latest as of
31 Mar 2026
13F 13D/G 3/4/5 Lead comparable stake: 6% 13D/G row: WELLINGTON MANAGEMENT GROUP LLP Showing 1-6 of 15 holder rows.
Holder Evidence Ownership % Position 12M Net Δ As of
WELLINGTON MANAGEMENT GROUP LLP
13F 13D/G
Company
13F 13D/G
6%
from 13D/G
$140,052,533
8,629,238 shares
 — 31 Dec 2025
VANGUARD PORTFOLIO MANAGEMENT LLC
13D/G
Vanguard Portfolio Management
13D/G
5.4%
$93,256,456
7,849,870 shares
 $0 31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC
13D/G
Vanguard Capital Management
13D/G
5%
$86,525,949
7,283,329 shares
 $0 31 Mar 2026
Capital Research Global Investors
13F 13D/G
Company
13F 13D/G
3.5%
from 13D/G
$209,696,290
12,920,289 shares
 — 31 Dec 2025
FMR LLC
13F 13D/G
Company
13F 13D/G
3.1%
from 13D/G
$108,760,051
6,701,174 shares
 — 31 Dec 2025
Rachel Lam
3/4/5
Director
3/4/5
0.16%
$5,046,789
226,822 shares
 -$333,750 12 Aug 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 Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions
295
Shares
131,062,977
Rows available
295
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. The marker flags a reported price that failed the local validity check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders
302
Q1 2026 holders
295
Holder diff
-7
Investor Q4 2025 Shares Q1 2026 Shares Share Diff Share Chg % Q4 2025 value Q1 2026 value Value change Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .