Montrose Environmental Group, Inc.

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC MEG

Report date

9/30/2025

Quarter

2025 Q3

Filed

11/12/2025

Shares

1,310,251

Value ($000)

35,979

Weight

0.1%

2020 Q3 - 2025 Q3 (21 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2025 Q3	11/12/2025	35,979	0.1%	1,310,251	9/30/2025
2025 Q2	7/29/2025	50,734	0.1%	2,317,660	6/30/2025
2025 Q1	5/9/2025	27,142	0.1%	1,903,388	3/31/2025
2024 Q4	2/10/2025	27,255	0.1%	1,469,280	12/31/2024
2024 Q3	11/8/2024	14,053	0.0%	534,342	9/30/2024
2024 Q2	8/8/2024	23,097	0.1%	518,345	6/30/2024
2024 Q1	5/8/2024	23,084	0.1%	589,317	3/31/2024
2023 Q4	2/9/2024	18,812	0.1%	585,493	12/31/2023
2023 Q3	11/9/2023	14,678	0.0%	501,633	9/30/2023
2023 Q2	8/11/2023	20,532	0.1%	487,455	6/30/2023
2023 Q1	5/12/2023	17,205	0.1%	482,336	3/31/2023
2022 Q4	2/9/2023	28,857	0.1%	650,070	12/31/2022
2022 Q3	11/9/2022	21,751	0.1%	646,380	9/30/2022
2022 Q2	8/10/2022	20,706	0.1%	613,329	6/30/2022
2022 Q1	5/11/2022	32,282	0.1%	609,894	3/31/2022
2021 Q4	2/14/2022	42,075	0.1%	596,720	12/31/2021
2021 Q3	11/10/2021	46,703	0.1%	756,450	9/30/2021
2021 Q2	8/12/2021	40,146	0.1%	748,146	6/30/2021
2021 Q1	5/13/2021	39,001	0.1%	777,065	3/31/2021
2020 Q4	2/9/2021	23,169	0.1%	748,360	12/31/2020
2020 Q3	11/6/2020	10,532	0.0%	442,155	9/30/2020