We are live on ! Find out more
MGNI icon

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
Truist Financial
201
Truist Financial
North Carolina
$143K -$123K -9,208 -43%
TSS
202
Two Sigma Securities
New York
$143K +$161K +12,031 New
SM
203
Sciencast Management
New Jersey
$139K +$157K +11,704 New
AIP
204
Ameritas Investment Partners
Nebraska
$139K – – –
DFCM
205
Dark Forest Capital Management
Puerto Rico
$139K +$157K +11,687 New
MCC
206
Money Concepts Capital
Florida
$139K +$156K +11,659 New
M&T Bank
207
M&T Bank
New York
$138K -$75.7K -5,645 -33%
Simplex Trading
208
Simplex Trading
Illinois
$134K -$3.38M -252,046 -96%
CWM
209
Cornerstone Wealth Management
Missouri
$130K – – –
PFBT
210
Parkside Financial Bank & Trust
Missouri
$128K +$18.8K +1,401 +15%
RWM
211
Ritholtz Wealth Management
New York
$123K +$139K +10,334 New
VPIM
212
Vanguard Personalized Indexing Management
California
$122K +$138K +10,311 New
TRCT
213
Tower Research Capital (TRC)
New York
$116K +$36K +2,688 +38%
Osaic Holdings
214
Osaic Holdings
Arizona
$115K -$91.4K -6,816 -41%
1IA
215
1620 Investment Advisors
Massachusetts
$113K +$8.04K +600 +7%
MMCM
216
Murphy & Mullick Capital Management
New York
$105K – – –
Walleye Capital
217
Walleye Capital
New York
$90.7K -$240K -17,924 -70%
Carson Wealth (CWM LLC)
218
Carson Wealth (CWM LLC)
Nebraska
$83.3K +$59.5K +4,435 +172%
Jones Financial Companies
219
Jones Financial Companies
Missouri
$82.3K +$21.1K +1,573 +29%
BC
220
Blackhill Capital
New Jersey
$71.2K – – –
Optiver Holding
221
Optiver Holding
Netherlands
$66.3K +$72.2K +5,383 +2,746%
VCM
222
Versant Capital Management
Arizona
$65.7K +$55.6K +4,148 +300%
Rockefeller Capital Management
223
Rockefeller Capital Management
New York
$56.8K -$48.5K -3,620 -43%
Nisa Investment Advisors
224
Nisa Investment Advisors
Missouri
$54.4K +$36.3K +2,709 +145%
KBC Group
225
KBC Group
Belgium
$53K – – –
7 8
9
10 11

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.