WELLINGTON MANAGEMENT GROUP LLP

Position in MGNI — Magnite, Inc.

CIK 902219 Boston, MA

Position in MGNI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$109,189,992

-$30,862,537 QoQ

Shares Held

9,191,077

+6.5% QoQ

Ownership

6.42%

of shares outstanding

% of Portfolio

0.02%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2020

17 quarters on record

Voting authority Sole 0.ToString("F0")% Shared 61.63262477291834.ToString("F0")% None 38.36737522708166.ToString("F0")%

Communication Services · as of Mar 31, 2026

WELLINGTON MANAGEMENT GROUP LLP holds $744,148,366 across 5 Advertising Agencies names. MGNI ranks #3 (14.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	APP	AppLovin Corp	1,093,058	$435,037,084
2	OMC	Omnicom Group Inc.	2,512,987	$189,253,048
3	MGNI	Magnite, Inc. This page	9,191,077	$109,189,992
4	NCMI	National CineMedia, Inc.	2,775,181	$8,464,299
5	DV	DoubleVerify Holdings, Inc.	231,994	$2,203,943

17 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$109,189,992	9,191,077	+6.5%	Shares	Defined	2026-05-15
2025-12-31	$140,052,529	8,629,238	+67.7%	Shares	Defined	2026-02-17
2025-09-30	$112,048,273	5,144,549	-5.6%	Shares	Defined	2025-11-14
2025-06-30	$131,401,826	5,447,837	-7.7%	Shares	Defined	2025-08-14
2025-03-31	$67,356,318	5,903,271	-16.0%	Shares	Defined	2025-05-13
2024-12-31	$111,917,773	7,030,011	+6.8%	Shares	Defined	2025-02-12
2024-09-30	$91,128,428	6,579,670	+125.3%	Shares	Defined	2024-11-14
2024-06-30	$38,805,616	2,919,911	+4.1%	Shares	Defined	2024-08-14
2024-03-31	$30,162,606	2,805,824	-4.5%	Shares	Defined	2024-05-15
2023-12-31	$27,455,311	2,939,541	+1.8%	Shares	Defined	2024-02-12
2023-09-30	$21,771,085	2,887,412	+38.0%	Shares	Defined	2023-11-14
2023-06-30	$28,559,442	2,092,267	+30.4%	Shares	Defined	2023-08-14
2023-03-31	$14,858,567	1,604,597	+8.1%	Shares	Defined	2023-05-12
2022-12-31	$15,714,499	1,483,900	+5.1%	Shares	Defined	2023-02-13
2022-09-30	$9,278,830	1,412,303	+11321.8%	Shares	Defined	2022-11-14
2021-06-30	$418,431	12,365	-99.7%	Shares	Defined	2021-08-16
2020-09-30	$30,066,457	4,326,109	—	Shares	Defined	2020-11-16
No filing history on record for this holder in this stock.