Harbor Capital Advisors’s Magnite MGNI Stock Holding History

Harbor Capital Advisors’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	$3.86M	Buy	325,261 +111,010	+52%	+$1.49M	0.31%	60
2025 Q4	$3.48M	Buy	214,251 +42,080	+24%	+$698K	0.27%	78
2025 Q3	$3.75M	Sell	172,171 -461,976	-73%	-$10.9M	0.29%	70
2025 Q2	$15.3M	Buy	634,147 +42,834	+7%	+$631K	0.64%	22
2025 Q1	$6.75M	Sell	591,313 -251,448	-30%	-$4.01M	0.31%	111
2024 Q4	$13.4M	Sell	842,761 -78,770	-9%	-$1.16M	0.59%	32
2024 Q3	$12.8M	Buy	921,531 +531,069	+136%	+$7.24M	0.55%	37
2024 Q2	$5.19M	Buy	390,462 +284,202	+267%	+$3.11M	0.4%	55
2024 Q1	$1.14M	Buy	106,260 +83,087	+359%	+$830K	0.15%	182
2023 Q4	$216K	Sell	23,173 -14,386	-38%	-$114K	0.04%	348
2023 Q3	$283K	Buy	37,559 +9,153	+32%	+$98.7K	0.06%	312
2023 Q2	$388K	Buy	+28,406	New	+$316K	0.08%	289

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

Harbor Capital Advisors's MGNI Position: Q1 2026 in Review

Harbor Capital Advisors increased its Magnite (MGNI) stake by 52% in Q1 2026, buying an estimated $1.49M and bringing the position to 325,261 shares worth $3.86M. The position accounts for 0.31% of the portfolio, ranked #60.

Harbor Capital Advisors first reported a position in MGNI in Q2 2023 and has held it in 12 quarters since. The position peaked at $15.3M in Q2 2025. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

Harbor Capital Advisors held 325,261 shares of Magnite worth $3.86M as of Q1 2026.
Harbor Capital Advisors bought 111,010 Magnite shares in Q1 2026, an estimated $1.49M.
Magnite made up 0.31% of Harbor Capital Advisors's portfolio in Q1 2026, its #60 holding.
Harbor Capital Advisors first reported a position in Magnite in Q2 2023 and has held it in 12 quarters since.
Harbor Capital Advisors's Magnite position peaked at $15.3M in Q2 2025.
296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Harbor Capital Advisors's 13F filing for Q1 2026, filed 28 Apr 2026.