SEI INVESTMENTS CO

Position in MGNI — Magnite, Inc.

CIK 350894 OAKS, PA

Position in MGNI

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$4,168,240

+$734,996 QoQ

Shares Held

350,862

+65.9% QoQ

Ownership

0.245%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2021

14 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Communication Services · as of Mar 31, 2026

SEI INVESTMENTS CO holds $262,647,522 across 12 Advertising Agencies names. MGNI ranks #5 (1.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	APP	AppLovin Corp	471,774	$187,766,052
2	OMC	Omnicom Group Inc.	715,718	$53,900,721
3	TTD	Trade Desk, Inc.	234,540	$5,321,712
4	CRTO	Criteo S.A.	246,026	$4,411,246
5	MGNI	Magnite, Inc. This page	350,862	$4,168,240
6	STGW	Stagwell Inc	371,788	$2,338,546
7	FLNT	Fluent, Inc.	508,110	$1,605,627
8	DV	DoubleVerify Holdings, Inc.	150,456	$1,429,332

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$4,168,240	350,862	+65.9%	Shares	Sole	2026-05-13
2025-12-31	$3,433,244	211,537	+182.1%	Shares	Sole	2026-02-13
2025-09-30	$1,633,128	74,983	-8.7%	Shares	Sole	2025-11-13
2025-06-30	$1,980,637	82,116	+106.5%	Shares	Sole	2025-08-14
2025-03-31	$453,695	39,763	-13.9%	Shares	Sole	2025-05-14
2024-12-31	$735,009	46,169	+86.9%	Shares	Sole	2025-02-11
2024-09-30	$342,164	24,705	-10.1%	Shares	Sole	2024-11-12
2023-06-30	$374,910	27,466	+30.2%	Shares	Sole	2023-08-11
2023-03-31	$195,375	21,099	+74.5%	Shares	Sole	2023-05-12
2022-12-31	$128,022	12,089	-71.7%	Shares	Sole	2023-02-10
2022-06-30	$379,006	42,681	+88.1%	Shares	Sole	2022-08-15
2021-09-30	$635,488	22,696	-81.8%	Shares	Sole	2021-11-12
2021-06-30	$4,214,263	124,535	+73.2%	Shares	Sole	2021-08-06
2021-03-31	$2,991,717	71,899	—	Shares	Sole	2021-05-12
No filing history on record for this holder in this stock.