Boston Partners
MGNI icon

Boston Partners’s Magnite MGNI Stock Holding History

Boston Partners’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 		$95.9M Buy
5,013,835
+293,972
+6% +$4.21M 0.09% 227
2026
Q1 		$56.1M Buy
4,719,863
+610,970
+15% +$8.19M 0.06% 250
2025
Q4 		$66.6M Sell
4,108,893
-340,111
-8% -$5.65M 0.07% 241
2025
Q3 		$95.2M Sell
4,449,004
-1,125,600
-20% -$26.6M 0.1% 215
2025
Q2 		$133M Buy
5,574,604
+298,248
+6% +$4.39M 0.15% 199
2025
Q1 		$60.2M Buy
5,276,356
+520,033
+11% +$8.29M 0.07% 227
2024
Q4 		$76.1M Buy
4,756,323
+1,336,458
+39% +$19.6M 0.09% 214
2024
Q3 		$46.4M Buy
3,419,865
+1,311,393
+62% +$17.9M 0.05% 244
2024
Q2 		$28.3M Buy
+2,108,472
New +$23M 0.04% 284
2020
Q1 		– Sell
-346,082
Closed -$2.82M – 708
2019
Q4 		$2.82M Sell
346,082
-34,087
-9% -$280K ﹤0.01% 430
2019
Q3 		$3.31M Buy
380,169
+12,750
+3% +$112K ﹤0.01% 416
2019
Q2 		$2.34M Sell
367,419
-81,157
-18% -$498K ﹤0.01% 506
2019
Q1 		$2.73M Buy
448,576
+5,809
+1% +$29.9K ﹤0.01% 496
2018
Q4 		$1.65M Sell
442,767
-103,068
-19% -$394K ﹤0.01% 580
2018
Q3 		$1.97M Sell
545,835
-15,432
-3% -$54.5K ﹤0.01% 611
2018
Q2 		$1.6M Buy
+561,267
New +$1.34M ﹤0.01% 693
2017
Q2 		– Sell
-258,521
Closed -$1.52M – 771
2017
Q1 		$1.52M Hold
258,521
– – ﹤0.01% 684
2016
Q4 		$1.92M Buy
+258,521
New +$2.01M ﹤0.01% 673

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
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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Boston Partners's MGNI Position: Q2 2026 in Review

Boston Partners increased its Magnite (MGNI) stake by 6.2% in Q2 2026, buying an estimated $4.21M and bringing the position to 5,013,835 shares worth $95.9M. The position accounts for 0.09% of the portfolio, ranked #227.

Boston Partners first reported a position in MGNI in Q4 2016 and has held it in 18 quarters since. The position peaked at $133M in Q2 2025. 310 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • Boston Partners held 5,013,835 shares of Magnite worth $95.9M as of Q2 2026.
  • Boston Partners bought 293,972 Magnite shares in Q2 2026, an estimated $4.21M.
  • Magnite made up 0.09% of Boston Partners's portfolio in Q2 2026, its #227 holding.
  • Boston Partners first reported a position in Magnite in Q4 2016 and has held it in 18 quarters since.
  • Boston Partners's Magnite position peaked at $133M in Q2 2025.
  • 310 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on Boston Partners's 13F filing for Q2 2026, filed 4 Aug 2026.