FRONTIER CAPITAL MANAGEMENT CO LLC

Position in AVTR — Avantor, Inc.

CIK 351173 Boston, MA

Position in AVTR

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$34,719,003

+$18,850,765 QoQ

Shares Held

3,506,970

+73.3% QoQ

Ownership

0.514%

of shares outstanding

% of Portfolio

0.32%

of 13F equity value

Holder Rank

#42

of 454 holders

Holding Since

Mar 2023

14 quarters on record

Voting authority Sole 54% Shared 0% None 46%

Healthcare · as of Jun 30, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $142,151,911 across 6 Medical Instruments & Supplies names. AVTR ranks #2 (24.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	NVST	Envista Holdings Corp	1,388,673	$36,591,533
2	AVTR	Avantor, Inc. This page	3,506,970	$34,719,003
3	MMSI	Merit Medical Systems Inc	468,540	$32,488,563
4	COO	Cooper Companies, Inc.	264,525	$18,969,087
5	ALC	Alcon Inc	152,897	$10,259,388
6	ALGN	Align Technology Inc	54,099	$9,124,337

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$34,719,003	3,506,970	+73.3%	Shares	Sole	2026-08-14
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.