Citadel Advisors’s Magnite MGNI Stock Holding History

Citadel 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	$12.4M	Buy	1,040,000 +279,800	+37%	+$3.75M	﹤0.01%	2953
2025 Q4	$12.3M	Buy	760,200 +271,100	+55%	+$4.5M	﹤0.01%	2975
2025 Q3	$10.7M	Sell	489,100 -145,800	-23%	-$3.44M	﹤0.01%	3177
2025 Q2	$15.3M	Buy	634,900 +270,700	+74%	+$3.99M	﹤0.01%	2475
2025 Q1	$4.16M	Buy	364,200 +166,800	+84%	+$2.66M	﹤0.01%	4194
2024 Q4	$3.14M	Buy	197,400 +76,600	+63%	+$1.12M	﹤0.01%	4761
2024 Q3	$1.67M	Buy	120,800 +46,700	+63%	+$636K	﹤0.01%	5856
2024 Q2	$985K	Buy	74,100 +32,100	+76%	+$351K	﹤0.01%	6609
2024 Q1	$452K	Sell	42,000 -2,400	-5%	-$24K	﹤0.01%	8614
2023 Q4	$415K	Sell	44,400 -4,900	-10%	-$38.7K	﹤0.01%	8491
2023 Q3	$372K	Sell	49,300 -41,200	-46%	-$444K	﹤0.01%	8704
2023 Q2	$1.24M	Sell	90,500 -47,200	-34%	-$525K	﹤0.01%	6025
2023 Q1	$1.28M	Buy	137,700 +57,300	+71%	+$611K	﹤0.01%	6271
2022 Q4	$851K	Buy	80,400 +21,700	+37%	+$198K	﹤0.01%	7125
2022 Q3	$386K	Sell	58,700 -47,300	-45%	-$381K	﹤0.01%	9023
2022 Q2	$941K	Sell	106,000 -29,300	-22%	-$314K	﹤0.01%	7156
2022 Q1	$1.79M	Sell	135,300 -35,800	-21%	-$483K	﹤0.01%	6334
2021 Q4	$2.99M	Sell	171,100 -15,900	-9%	-$358K	﹤0.01%	5345
2021 Q3	$5.24M	Sell	187,000 -106,800	-36%	-$3.21M	﹤0.01%	4214
2021 Q2	$9.94M	Sell	293,800 -24,700	-8%	-$837K	﹤0.01%	3087
2021 Q1	$13.3M	Buy	318,500 +169,000	+113%	+$7.32M	﹤0.01%	2551
2020 Q4	$4.59M	Buy	149,500 +77,000	+106%	+$1.17M	﹤0.01%	3839
2020 Q3	$504K	Buy	72,500 +10,800	+18%	+$72.2K	﹤0.01%	7290
2020 Q2	$412K	Buy	61,700 +19,000	+44%	+$119K	﹤0.01%	7413
2020 Q1	$237K	Sell	42,700 -55,300	-56%	-$508K	﹤0.01%	7722
2019 Q4	$800K	Buy	98,000 +86,500	+752%	+$711K	﹤0.01%	5993
2019 Q3	$100K	Buy	+11,500	New	+$101K	﹤0.01%	8483
2019 Q2	–	Sell	-20,800	Closed	-$126K	–	9588
2019 Q1	$126K	Buy	+20,800	New	+$107K	﹤0.01%	8464
2018 Q3	–	Sell	-11,900	Closed	-$34K	–	9520
2018 Q2	$34K	Buy	+11,900	New	+$28.3K	﹤0.01%	8530
2018 Q1	–	Sell	-21,500	Closed	-$40K	–	8582
2017 Q4	$40K	Buy	+21,500	New	+$53.7K	﹤0.01%	7691
2017 Q3	–	Sell	-20,600	Closed	-$106K	–	7824
2017 Q2	$106K	Sell	20,600 -5,400	-21%	-$29.7K	﹤0.01%	6881
2017 Q1	$153K	Buy	+26,000	New	+$203K	﹤0.01%	6675
2016 Q4	–	Sell	-14,500	Closed	-$120K	–	7617
2016 Q3	$120K	Sell	14,500 -4,400	-23%	-$46.8K	﹤0.01%	6576
2016 Q2	$258K	Buy	+18,900	New	+$304K	﹤0.01%	5445
2016 Q1	–	Sell	-5,700	Closed	-$94K	–	7493
2015 Q4	$94K	Sell	5,700 -14,100	-71%	-$218K	﹤0.01%	6762
2015 Q3	$288K	Sell	19,800 -4,300	-18%	-$65.6K	﹤0.01%	5625
2015 Q2	$361K	Buy	24,100 +4,800	+25%	+$82.7K	﹤0.01%	5465
2015 Q1	$346K	Buy	19,300 +13,900	+257%	+$234K	﹤0.01%	5454
2014 Q4	$87K	Buy	5,400 +4,100	+315%	+$52.9K	﹤0.01%	6753
2014 Q3	$15K	Buy	+1,300	New	+$14.2K	﹤0.01%	7614

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

Citadel Advisors's MGNI Position: Q1 2026 in Review

Citadel Advisors increased its Magnite (MGNI) stake by 93% in Q1 2026, buying an estimated $6.82M and bringing the position to 1,052,908 shares worth $12.5M. The position accounts for ﹤0.01% of the portfolio, ranked #2932.

Citadel Advisors first reported a position in MGNI in Q2 2014 and has held it in 47 quarters since. The position peaked at $51M in Q2 2021. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

Citadel Advisors held 1,052,908 shares of Magnite worth $12.5M as of Q1 2026.
Citadel Advisors bought 508,590 Magnite shares in Q1 2026, an estimated $6.82M.
Magnite made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #2932 holding.
Citadel Advisors first reported a position in Magnite in Q2 2014 and has held it in 47 quarters since.
Citadel Advisors's Magnite position peaked at $51M in Q2 2021.
297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.