HARBOR CAPITAL ADVISORS, INC.

Position in MGNI — Magnite, Inc.

CIK 1039128 CHICAGO, IL

Position in MGNI

as of Mar 31, 2026 · filed Apr 28, 2026 Compact

Position Value

$3,864,100

+$386,807 QoQ

Shares Held

325,261

+51.8% QoQ

Ownership

0.227%

of shares outstanding

% of Portfolio

0.36%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2023

12 quarters on record

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

Communication Services · as of Mar 31, 2026

HARBOR CAPITAL ADVISORS, INC. holds $10,536,104 across 7 Advertising Agencies names. MGNI ranks #2 (36.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	STGW	Stagwell Inc	746,527	$4,695,654
2	MGNI	Magnite, Inc. This page	325,261	$3,864,100
3	NCMI	National CineMedia, Inc.	242,432	$739,417
4	ZD	Ziff Davis, Inc.	10,450	$438,482
5	TTD	Trade Desk, Inc.	17,733	$402,361
6	DV	DoubleVerify Holdings, Inc.	31,601	$300,209
7	WPP	WPP plc	6,166	$95,881

12 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$3,864,100	325,261	+51.8%	Shares	Sole	2026-04-28
2025-12-31	$3,477,293	214,251	+24.4%	Shares	Sole	2026-01-20
2025-09-30	$3,749,884	172,171	-72.8%	Shares	Sole	2025-10-15
2025-06-30	$15,295,625	634,147	+7.2%	Shares	Sole	2025-07-09
2025-03-31	$6,746,881	591,313	-29.8%	Shares	Sole	2025-04-14
2024-12-31	$13,416,755	842,761	-8.5%	Shares	Sole	2025-01-10
2024-09-30	$12,763,204	921,531	+136.0%	Shares	Sole	2024-10-29
2024-06-30	$5,189,239	390,462	+267.5%	Shares	Sole	2024-07-09
2024-03-31	$1,142,295	106,260	+358.6%	Shares	Sole	2024-05-13
2023-12-31	$216,435	23,173	-38.3%	Shares	Sole	2024-01-08
2023-09-30	$283,194	37,559	+32.2%	Shares	Sole	2023-10-20
2023-06-30	$387,741	28,406	—	Shares	Sole	2023-07-11
No filing history on record for this holder in this stock.