Avenir Corporation’s Magnite MGNI Stock Holding History

Avenir Corporation’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	$210K	Buy	+17,715	New	+$237K	0.03%	70
2025 Q1	–	Sell	-35,000	Closed	-$557K	–	71
2024 Q4	$557K	Hold	35,000	–	–	0.06%	46
2024 Q3	$485K	Hold	35,000	–	–	0.05%	50
2024 Q2	$465K	Hold	35,000	–	–	0.05%	49
2024 Q1	$376K	Hold	35,000	–	–	0.03%	53
2023 Q4	$327K	Hold	35,000	–	–	0.03%	54
2023 Q3	$264K	Sell	35,000 -4,270	-11%	-$46K	0.02%	53
2023 Q2	$536K	Hold	39,270	–	–	0.05%	44
2023 Q1	$364K	Buy	39,270 +4,270	+12%	+$45.5K	0.03%	51
2022 Q4	$371K	Buy	35,000 +3,000	+9%	+$27.4K	0.04%	49
2022 Q3	$210K	Buy	32,000 +16,000	+100%	+$129K	0.02%	58
2022 Q2	$142K	Buy	16,000 +4,000	+33%	+$42.9K	0.01%	62
2022 Q1	$159K	Buy	+12,000	New	+$162K	0.01%	67

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

Avenir Corporation's MGNI Position: Q1 2026 in Review

Avenir Corporation opened a new position in Magnite (MGNI) in Q1 2026: 17,715 shares worth $210K. The stake represents 0.03% of the portfolio and ranks #70 among its holdings. This is a return to the name: Avenir Corporation previously reported a position in MGNI as recently as Q4 2024.

Avenir Corporation first reported a position in MGNI in Q1 2022 and has held it in 13 quarters since. The position peaked at $557K in Q4 2024. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

Avenir Corporation held 17,715 shares of Magnite worth $210K as of Q1 2026.
Magnite was a new Avenir Corporation position in Q1 2026.
Magnite made up 0.03% of Avenir Corporation's portfolio in Q1 2026, its #70 holding.
Avenir Corporation first reported a position in Magnite in Q1 2022 and has held it in 13 quarters since.
Avenir Corporation's Magnite position peaked at $557K in Q4 2024.
296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Avenir Corporation's 13F filing for Q1 2026, filed 14 May 2026.