Janus Henderson Group
MGNI icon

Janus Henderson Group’s Magnite MGNI Stock Holding History

Janus Henderson Group’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
Q1 		$694K Hold
58,423
– – ﹤0.01% 1854
2025
Q4 		$948K Hold
58,423
– – ﹤0.01% 1702
2025
Q3 		$1.27M Hold
58,423
– – ﹤0.01% 1534
2025
Q2 		$1.41M Hold
58,423
– – ﹤0.01% 1451
2025
Q1 		$677K Hold
58,423
– – ﹤0.01% 1804
2024
Q4 		$930K Hold
58,423
– – ﹤0.01% 1730
2024
Q3 		$809K Hold
58,423
– – ﹤0.01% 1779
2024
Q2 		$777K Sell
58,423
-625
-1% -$6.83K ﹤0.01% 1754
2024
Q1 		$633K Buy
59,048
+8
+0% +$80 ﹤0.01% 1892
2023
Q4 		$552K Sell
59,040
-90
-0.2% -$711 ﹤0.01% 1945
2023
Q3 		$446K Buy
59,130
+12
+0% +$129 ﹤0.01% 1981
2023
Q2 		$806K Sell
59,118
-132
-0.2% -$1.47K ﹤0.01% 1713
2023
Q1 		$548K Buy
59,250
+36,840
+164% +$393K ﹤0.01% 1960
2022
Q4 		$237K Sell
22,410
-22,412
-50% -$205K ﹤0.01% 2093
2022
Q3 		$294K Buy
44,822
+22,434
+100% +$181K ﹤0.01% 2220
2022
Q2 		$199K Sell
22,388
-7
-0% -$75 ﹤0.01% 2312
2022
Q1 		$295K Buy
22,395
+8
+0% +$108 ﹤0.01% 2234
2021
Q4 		$392K Buy
22,387
+11,278
+102% +$254K ﹤0.01% 2045
2021
Q3 		$311K Buy
+11,109
New +$334K ﹤0.01% 1872

Other funds holding MGNI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

Janus Henderson Group's MGNI Position: Q1 2026 in Review

Janus Henderson Group held its Magnite (MGNI) position steady in Q1 2026 at 58,423 shares worth $694K. The position accounts for ﹤0.01% of the portfolio, ranked #1854.

Janus Henderson Group first reported a position in MGNI in Q3 2021 and has held it in 19 quarters since. The position peaked at $1.41M in Q2 2025. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Janus Henderson Group held 58,423 shares of Magnite worth $694K as of Q1 2026.
  • Janus Henderson Group left its Magnite share count unchanged in Q1 2026.
  • Magnite made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1854 holding.
  • Janus Henderson Group first reported a position in Magnite in Q3 2021 and has held it in 19 quarters since.
  • Janus Henderson Group's Magnite position peaked at $1.41M in Q2 2025.
  • 297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.