Picton Mahoney Asset Management’s Magnite MGNI Stock Holding History

Picton Mahoney Asset Management’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	$7.64M	Buy	643,078 +254,947	+66%	+$3.42M	0.06%	286
2025 Q4	$6.3M	Buy	388,131 +799	+0.2%	+$13.3K	0.05%	285
2025 Q3	$8.44M	Buy	387,332 +259,482	+203%	+$6.13M	0.08%	218
2025 Q2	$3.08M	Buy	+127,850	New	+$1.88M	0.03%	298
2021 Q3	–	Sell	-3,400	Closed	-$115K	–	926
2021 Q2	$115K	Buy	+3,400	New	+$115K	﹤0.01%	647

Other funds holding MGNI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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 Los Angeles, California $645B AUM 30.41% 1-Year Est. Return

Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

Picton Mahoney Asset Management's MGNI Position: Q1 2026 in Review

Picton Mahoney Asset Management increased its Magnite (MGNI) stake by 66% in Q1 2026, buying an estimated $3.42M and bringing the position to 643,078 shares worth $7.64M. The position accounts for 0.06% of the portfolio, ranked #286.

Picton Mahoney Asset Management first reported a position in MGNI in Q2 2021 and has held it in 5 quarters since. The position peaked at $8.44M in Q3 2025. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

Picton Mahoney Asset Management held 643,078 shares of Magnite worth $7.64M as of Q1 2026.
Picton Mahoney Asset Management bought 254,947 Magnite shares in Q1 2026, an estimated $3.42M.
Magnite made up 0.06% of Picton Mahoney Asset Management's portfolio in Q1 2026, its #286 holding.
Picton Mahoney Asset Management first reported a position in Magnite in Q2 2021 and has held it in 5 quarters since.
Picton Mahoney Asset Management's Magnite position peaked at $8.44M in Q3 2025.
296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Picton Mahoney Asset Management's 13F filing for Q1 2026, filed 13 May 2026.