FRONTIER CAPITAL MANAGEMENT CO LLC

Position in AVTR — Avantor, Inc.

CIK 351173 Boston, MA

Position in AVTR

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

Position Value

$15,868,238

-$4,897,385 QoQ

Shares Held

2,024,010

+11.7% QoQ

Ownership

0.296%

of shares outstanding

% of Portfolio

0.16%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2023

13 quarters on record

Voting authority Sole 57.824862525382784.ToString("F0")% Shared 0.ToString("F0")% None 42.175137474617216.ToString("F0")%

Healthcare · as of Mar 31, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $167,631,292 across 7 Medical Instruments & Supplies names. AVTR ranks #5 (9.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	NVST	Envista Holdings Corp	1,435,870	$36,428,021
2	ALGN	Align Technology Inc	196,512	$33,688,052
3	MMSI	Merit Medical Systems Inc	430,618	$29,682,498
4	COO	Cooper Companies, Inc.	352,335	$25,191,952
5	AVTR	Avantor, Inc. This page	2,024,010	$15,868,238
6	RMD	Resmed Inc	65,224	$14,641,483
7	ALC	Alcon Inc	160,996	$12,131,048

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$15,868,238	2,024,010	+11.7%	Shares	Sole	2026-05-15
2025-12-31	$20,765,623	1,812,009	-28.8%	Shares	Sole	2026-02-17
2025-09-30	$31,750,879	2,544,141	+289.5%	Shares	Sole	2025-11-14
2025-06-30	$8,791,600	653,165	-53.4%	Shares	Sole	2025-08-14
2025-03-31	$22,718,266	1,401,497	-4.5%	Shares	Sole	2025-05-15
2024-12-31	$30,929,369	1,467,934	-1.8%	Shares	Sole	2025-02-14
2024-09-30	$38,673,011	1,494,898	-22.3%	Shares	Sole	2024-11-14
2024-06-30	$40,766,476	1,922,947	-30.3%	Shares	Sole	2024-08-14
2024-03-31	$70,496,311	2,756,993	+156.3%	Shares	Sole	2024-05-15
2023-12-31	$24,555,468	1,075,579	+213.8%	Shares	Sole	2024-02-14
2023-09-30	$7,225,212	342,752	+38.9%	Shares	Sole	2023-11-14
2023-06-30	$5,068,881	246,781	+67.8%	Shares	Sole	2023-08-14
2023-03-31	$3,109,376	147,085	—	Shares	Sole	2023-05-15
No filing history on record for this holder in this stock.