MAGNITE INC

$MGNI
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Smart money positioned

8 of the Top-200 alpha managers hold $MGNI as of the latest 13F snapshot.

13F holders
286
Insider buys · 90d
0
Congress · 90d
0

Smart Money · top-200 alpha cohort

8 holders · Q1 2026

$MGNI is held by 8 managers from the Top-Performer cohort as of Q1 2026. Position weights range from 0.00% to 1.82%, with an average of 0.25% of portfolio. Largest holder: Blue Grotto Capital, LLC at 1.82%. A weekly Smart-Money commentary for this ticker has not been generated yet this batch — the table below shows the full cohort positioning.

01
Blue Grotto Capital, LLC
1.82% ↓ 0.9pp
α +12.7pts
02
Caption Management, LLC
0.13% held
α +15.5pts
03
Wellington Management Group LLP
0.02% held
α +10.5pts
04
Fulton Bank, N.a.
0.01% held
α +23.8pts
05
Level Financial Advisors
0.00% held
α +30.9pts

Smart Money shows holdings from our Top-Performer cohort — the 200 highest-alpha manager_13f funds in our universe. Position weight (current quarter) and QoQ delta versus prior quarter. α is the manager's annual alpha vs benchmark.

Institutional holders

Top 10 of 286 · Source: 13F-HR
01
Generation Investment Management LLP
0.06% of portfolio
12,200,343 sh
02
Willow Creek Wealth Management Inc.
14.21% of portfolio
6,962,566 sh
03
Envestnet Asset Management Inc.
0.01% of portfolio
5,020,289 sh
04
Massachusetts Institute of Technology
0.03% of portfolio
4,626,816 sh
05
Exor N.V.
—
4,541,411 sh
06
Solus Alternative Asset Management LP
—
4,160,000 sh
07
Gardner Russo & Quinn LLC
0.02% of portfolio
4,080,770 sh
08
Axa S.a.
—
3,163,139 sh
09
State Street
—
3,141,991 sh
10
Narus Financial Partners, LLC
0.13% of portfolio
3,000,000 sh
See all 286 13F holders · Pro →

Insider activity · last 90 days

50 transactions · 13 filers
17 Dec 2025
Soroca Adam Lee —
▼ SOLD
16,656
$17.00
S
24 Nov 2025
Buckley Sean Patrick —
▼ SOLD
2,213
$14.50
S
21 Nov 2025
Spillane Robert F —
▼ SOLD
12,500
$14.22
S
18 Nov 2025
Buckley Sean Patrick —
▼ SOLD
4,426
$13.36
S
18 Nov 2025
Soroca Adam Lee —
▼ SOLD
10,857
$13.23
S
24 Oct 2025
Caine Paul —
▼ SOLD
5,000
$20.00
S
19 Sep 2025
Saltz Aaron —
▼ SOLD
8,522
$24.50
S
19 Sep 2025
Caine Paul —
▼ SOLD
7,500
$25.00
S
15 Sep 2025
Saltz Aaron —
▼ SOLD
6,180
$23.94
S
10 Sep 2025
Caine Paul —
▼ SOLD
1,189
$23.91
S
10 Sep 2025
Caine Paul —
▼ SOLD
3,811
$23.50
S
09 Sep 2025
Buckley Sean Patrick —
▼ SOLD
20,000
$24.61
S

Transaction codes: P open-market purchase · S sale · M option exercise · A grant · F tax-withhold sale. Insider names link to each individual's expert page.

Congress trades · last 90 days

No Congress trades

No STOCK Act filings reference $MGNI in the recent window.

Source data: SEC EDGAR · 13F-HR · Form 4 · U.S. House Clerk PTR (disclosures-clerk.house.gov) · Senate eFD (senate.gov) · Last refreshed 10:13 UTC.