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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
ACA
301
Apis Capital Advisors
New York
– -$9.8M -604,000 Closed
PLC
302
Pillsbury Lake Capital
California
– -$9.47M -583,644 Closed
Bank of Montreal
303
Bank of Montreal
Ontario, Canada
– -$4.48M -276,273 Closed
ACA
304
AYAL Capital Advisors
Ontario, Canada
– -$3.25M -200,000 Closed
First Trust Advisors
305
First Trust Advisors
Illinois
– -$3.24M -199,872 Closed
BA
306
Bridgewater Associates
Connecticut
– -$2.36M -145,187 Closed
BFM
307
Boothbay Fund Management
New York
– -$1.91M -117,842 Closed
Calamos Advisors
308
Calamos Advisors
Illinois
– -$1.84M -113,457 Closed
MF
309
Magnetar Financial
Illinois
– -$1.56M -96,163 Closed
Verition Fund Management
310
Verition Fund Management
Connecticut
– -$1.01M -62,277 Closed
WAM
311
Weiss Asset Management
Massachusetts
– -$949K -58,484 Closed
LCM
312
Laurion Capital Management
New York
– -$826K -50,869 Closed
EGM
313
Engineers Gate Manager
New York
– -$668K -41,137 Closed
Thrivent Financial for Lutherans
314
Thrivent Financial for Lutherans
Minnesota
– -$531K -32,744 Closed
NLGIA
315
Nippon Life Global Investors Americas
New York
– -$522K -32,180 Closed
SCP
316
Sender Company & Partners
New York
– -$485K -29,905 Closed
BCI
317
Brinker Capital Investments
Pennsylvania
– -$477K -29,372 Closed
EP
318
Edgestream Partners
New Jersey
– -$458K -28,194 Closed
FGP
319
Freestone Grove Partners
California
– -$451K -27,761 Closed
AP
320
Antipodes Partners
Australia
– -$403K -24,831 Closed
OWA
321
Outlook Wealth Advisors
Texas
– -$402K -24,764 Closed
GAM
322
Griffin Asset Management
New York
– -$324K -19,935 Closed
A
323
AlphaQuest
New York
– -$311K -19,153 Closed
AIP
324
ARS Investment Partners
New York
– -$227K -14,000 Closed
FFA
325
Florida Financial Advisors
Florida
– -$206K -12,686 Closed
10 11 12
13
14

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.