Granahan Investment Management, LLC

Position in MGNI — Magnite, Inc.

CIK 1026710 WALTHAM, MA

Position in MGNI

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

Position Value

$30,334,546

-$20,236,997 QoQ

Shares Held

2,553,413

-18.1% QoQ

Ownership

1.78%

of shares outstanding

% of Portfolio

1.47%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

24 quarters on record

Voting authority Sole 87.69838643415694.ToString("F0")% Shared 0.ToString("F0")% None 12.30161356584305.ToString("F0")%

Communication Services · as of Mar 31, 2026

Granahan Investment Management, LLC holds $30,334,546 across 1 Advertising Agencies name. MGNI ranks #1 (100.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	MGNI	Magnite, Inc. This page	2,553,413	$30,334,546

24 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$30,334,546	2,553,413	-18.1%	Shares	Sole	2026-05-15
2025-12-31	$50,571,543	3,115,930	-19.6%	Shares	Sole	2026-02-17
2025-09-30	$84,357,838	3,873,179	+6.3%	Shares	Sole	2025-11-14
2025-06-30	$87,863,998	3,642,786	+37.5%	Shares	Sole	2025-08-14
2025-03-31	$30,236,385	2,649,990	-26.7%	Shares	Sole	2025-05-15
2024-12-31	$57,520,297	3,613,084	-9.7%	Shares	Sole	2025-02-14
2024-09-30	$55,409,958	4,000,719	-23.5%	Shares	Sole	2024-11-14
2024-06-30	$69,508,693	5,230,150	-3.8%	Shares	Sole	2024-08-14
2024-03-31	$58,459,489	5,438,092	-19.2%	Shares	Sole	2024-05-15
2023-12-31	$62,823,343	6,726,268	-6.6%	Shares	Sole	2024-02-14
2023-09-30	$54,316,674	7,203,803	-4.6%	Shares	Sole	2023-11-14
2023-06-30	$103,098,368	7,552,994	-17.3%	Shares	Sole	2023-08-14
2023-03-31	$84,572,644	9,133,115	-12.6%	Shares	Sole	2023-05-15
2022-12-31	$110,707,330	10,453,950	+0.3%	Shares	Sole	2023-02-14
2022-09-30	$68,446,010	10,417,962	+9.7%	Shares	Sole	2022-11-14
2022-06-30	$84,353,411	9,499,258	+4.1%	Shares	Sole	2022-08-15
2022-03-31	$120,590,774	9,128,749	+7.6%	Shares	Sole	2022-05-16
2021-12-31	$148,441,247	8,482,357	+18.4%	Shares	Sole	2022-02-14
2021-09-30	$200,554,256	7,162,652	+10.7%	Shares	Sole	2021-11-15
2021-06-30	$219,046,083	6,472,993	+26.6%	Shares	Sole	2021-08-16
2021-03-31	$212,771,445	5,113,469	-23.9%	Shares	Sole	2021-05-17
2020-12-31	$206,222,471	6,715,157	-33.0%	Shares	Sole	2021-02-12
2020-09-30	$69,660,378	10,023,076	+27.6%	Shares	Sole	2020-11-12
2020-06-30	$52,413,633	7,858,116	—	Shares	Sole	2020-08-14
No filing history on record for this holder in this stock.