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Magnite
MGNI

297 hedge funds and large institutions have $1.56B invested in Magnite in 2026 Q1 according to their latest regulatory filings, with 52 funds opening new positions, 114 increasing their positions, 80 reducing their positions, and 54 closing their positions.

New
Increased
Maintained
Reduced
Closed

43% more repeat investments, than reductions

Existing positions increased: 114 | Existing positions reduced: 80

4% less first-time investments, than exits

New positions opened: 52 | Existing positions closed: 54

2% less funds holding

Funds holding: 304 → 297 (-7)

4.02% less ownership

Funds ownership: 95.15% → 91.13% (-4%)

10% less funds holding in top 10

Funds holding in top 10: 10 → 9 (-1)

30% less capital invested

Capital invested by funds: $2.22B → $1.56B (-$655M)

49% less call options, than puts

Call options by funds: $26.7M | Put options by funds: $52.5M

Holders
297
Holders Change
-7
Holders Change %
-2.3%
% of All Funds
3.66%
Holding in Top 10
9
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-10%
% of All Funds
0.11%
New
52
Increased
114
Reduced
80
Closed
54
Calls
$26.7M
Puts
$52.5M
Net Calls
-$25.8M
Net Calls Change
-$58.2M

Top Buyers

1
Jane Street
Jane Street
New York
+$17.3M
2
Millennium Management
Millennium Management
New York
+$16.2M
3
Victory Capital Management
Victory Capital Management
Texas
+$15M
4
SSA
Schonfeld Strategic Advisors
New York
+$11.1M
5
GC
Grizzlyrock Capital
Illinois
+$8.94M

Top Sellers

1
Capital Research Global Investors
Capital Research Global Investors
California
-$106M
2
Fidelity Investments
Fidelity Investments
Massachusetts
-$29.4M
3
SIMG
Stephens Investment Management Group
Texas
-$18.3M
4
FCM
Frontier Capital Management
Massachusetts
-$15.3M
5
JGC
J. Goldman & Co
New York
-$12.7M
Name Holding Trade Value Shares
Change 		Change in
Stake
KAS
251
Kemnay Advisory Services
New York
$8.81K +$9.95K +742 New
CCWM
252
Cassaday & Co Wealth Management
Virginia
$8.49K +$9.59K +715 New
EPIMS
253
Evelyn Partners Investment Management Services
$8.35K – – –
EP
254
Essential Partners
California
$8.27K +$9.1K +679 +3,994%
SS
255
SBI Securities
Japan
$8.07K -$2.23K -166 -20%
CA
256
CoreCap Advisors
Michigan
$6.22K +$1.92K +143 +38%
RF
257
Rossby Financial
Florida
$5.89K – – –
Bessemer Group
258
Bessemer Group
New Jersey
$5K – – –
CT
259
Colonial Trust
South Carolina
$3.56K – – –
PA
260
Parallel Advisors
California
$3.37K – – –
RIL
261
Rothschild Investment LLC
Illinois
$3.35K +$1.35K +101 +56%
FFA
262
Farther Finance Advisors
California
$2.9K +$1.26K +94 +62%
RFP
263
Root Financial Partners
California
$2.71K +$1.96K +146 +178%
AWM
264
Abound Wealth Management
Tennessee
$2.09K – – –
AAP
265
Arax Advisory Partners
Colorado
$2.04K +$818 +61 +55%
ME
266
McIlrath & Eck
Washington
$1.9K – – –
AIM
267
Anchor Investment Management
South Carolina
$1.78K – – –
FFO
268
Fortitude Family Office
Arizona
$1.54K -$5.28K -394 -75%
IAIM
269
International Assets Investment Management
Florida
$1.3K – – –
BGAI
270
Bruce G. Allen Investments
Colorado
$1.28K +$161 +12 +13%
C
271
Covestor
United Kingdom
$1K – – –
SIC
272
SJS Investment Consulting
Ohio
$987 +$1K +75 +938%
GCP
273
Gill Capital Partners
Colorado
$891 +$1K +75 New
Federated Hermes
274
Federated Hermes
Pennsylvania
$843 -$2.32M -172,876 -100%
CFO
275
CVA Family Office
Colorado
$832 +$938 +70 New
9 10
11
12 13

MGNI Hedge Fund Activity: Q1 2026 in Review

297 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in Magnite (MGNI) for Q1 2026, worth a combined $1.56B — down 30% from $2.22B a quarter earlier.

Sellers outnumbered buyers: 54 funds closed out of MGNI and 52 opened new positions — a net loss of 2 holders — while 80 trimmed existing stakes and 114 added.

The largest buyer was Jane Street, adding an estimated $17.3M. The largest seller was Capital Research Global Investors, cutting an estimated $106M.

  • 297 institutional investors held Magnite (MGNI) as of Q1 2026, down from 304 in Q4 2025.
  • Funds reported $1.56B of Magnite stock for Q1 2026, down 30% quarter-over-quarter.
  • 52 funds opened new Magnite positions in Q1 2026 and 54 closed out, a net change of -2 holders.
  • The largest Magnite buyer in Q1 2026 was Jane Street, an estimated $17.3M added.
  • The largest Magnite seller in Q1 2026 was Capital Research Global Investors, an estimated $106M sold.

Based on aggregated 13F filings for Q1 2026.