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B. Riley Financial’s Magnite MGNI Stock Holding History

B. Riley Financial’s Portfolio MGNI Stock Details MGNI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$318K Buy
+16,778
New +$240K 0.07% 15
2019
Q3 		– Sell
-589,055
Closed -$3.75M – 54
2019
Q2 		$3.75M Sell
589,055
-876,468
-60% -$5.38M 1.8% 12
2019
Q1 		$8.91M Sell
1,465,523
-283,237
-16% -$1.46M 3.47% 8
2018
Q4 		$6.52M Sell
1,748,760
-48,077
-3% -$184K 3.6% 11
2018
Q3 		$6.47M Sell
1,796,837
-255,561
-12% -$903K 1.84% 13
2018
Q2 		$5.85M Buy
2,052,398
+1,952,398
+1,952% +$4.65M 1.53% 12
2018
Q1 		$180K Buy
+100,000
New +$189K 0.05% 264
2017
Q4 		– Sell
-74,000
Closed -$288K – 330
2017
Q3 		$288K Buy
+74,000
New +$315K 0.08% 226
2016
Q1 		– Sell
-17,818
Closed -$293K – 136
2015
Q4 		$293K Buy
+17,818
New +$276K 0.21% 75

Other funds holding MGNI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return

B. Riley Financial's MGNI Position: Q2 2026 in Review

B. Riley Financial opened a new position in Magnite (MGNI) in Q2 2026: 16,778 shares worth $318K. The stake represents 0.07% of the portfolio and ranks #15 among its holdings. This is a return to the name: B. Riley Financial previously reported a position in MGNI as recently as Q2 2019.

B. Riley Financial first reported a position in MGNI in Q4 2015 and has held it in 9 quarters since. The position peaked at $8.91M in Q1 2019. 311 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • B. Riley Financial held 16,778 shares of Magnite worth $318K as of Q2 2026.
  • Magnite was a new B. Riley Financial position in Q2 2026.
  • Magnite made up 0.07% of B. Riley Financial's portfolio in Q2 2026, its #15 holding.
  • B. Riley Financial first reported a position in Magnite in Q4 2015 and has held it in 9 quarters since.
  • B. Riley Financial's Magnite position peaked at $8.91M in Q1 2019.
  • 311 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on B. Riley Financial's 13F filing for Q2 2026, filed 14 Aug 2026.