William Blair Investment Management, Llc

13F Holdings History for Montrose Environmental Group, Inc. - Common Stock (MEG)

Symbol: MEG on NYSE
Investment type: Equity / Common Stock
Latest Disclosed Ownership: 2.32M shares
Security Ownership: 6.8%

Shares, Excluding Options vs Price

Value, Excluding Options

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC ownership in Montrose Environmental Group, Inc. Common Stock (MEG)

2025-07-30 - WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2.32M shares of Montrose Environmental Group, Inc. Common Stock (MEG). This represents 6.8% percent ownership of the company. In their previous filing dated 2025-05-09, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC had reported owning 1.9M shares, indicating an increase of 21.8% percent.

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filed at
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	6.8%	+21.7%	$43.1M	2.32M	+414,272	+21.8%	$18.60	13G/A	6/30/2025	30 Jul 2025 12:04:08
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	5.5%		$25.7M	1.9M			$13.50	13G	3/31/2025	9 May 2025 16:13:10

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
6/30/2025	0.13%	+0.02%	$50.7M	2.32M	+414,272	+21.8%	$21.89	Q2 2025
3/31/2025	0.08%	+0.02%	$27.1M	1.9M	+434,108		$14.26	Q1 2025
12/31/2024	0.07%	+0.04%	$27.3M	1.47M	+934,938	+175%	$18.55	Q4 2024
9/30/2024	0.03%	+0%	$14.1M	534K	+15,997	+3.09%	$26.30	Q3 2024
6/30/2024	0.06%	-0.01%	$23.1M	518K	-70,972	-12%	$44.56	Q2 2024
3/31/2024	0.06%	+0%	$23.1M	589K	+3,824	+0.65%	$39.17	Q1 2024
12/31/2023	0.05%	+0.01%	$18.8M	585K	+83,860	+16.7%	$32.13	Q4 2023
9/30/2023	0.05%	+0%	$14.7M	502K	+14,178	+2.91%	$29.26	Q3 2023
6/30/2023	0.07%	+0%	$20.5M	487K	+5,119	+1.06%	$42.12	Q2 2023
3/31/2023	0.06%	-0.02%	$17.2M	482K	-167,734	-25.8%	$35.67	Q1 2023
12/31/2022	0.11%	+0%	$28.9M	650K	+3,690	+0.57%	$44.39	Q4 2022
9/30/2022	0.09%	+0%	$21.8M	646K	+33,051	+5.39%	$33.65	Q3 2022
6/30/2022	0.08%	+0%	$20.7M	613K	+3,435	+0.56%	$33.76	Q2 2022
3/31/2022	0.1%	+0%	$32.3M	610K	+13,174	+2.21%	$52.93	Q1 2022
12/31/2021	0.11%	-0.03%	$42.1M	597K	-159,730	-21.1%	$70.51	Q4 2021
9/30/2021	0.13%	+0%	$46.7M	756K	+8,304	+1.11%	$61.74	Q3 2021
6/30/2021	0.13%	-0.01%	$40.1M	748K	-28,919	-3.72%	$53.66	Q2 2021
3/31/2021	0.13%	+0%	$39M	777K	+28,705	+3.84%	$50.19	Q1 2021
12/31/2020	0.08%	+0.03%	$23.2M	748K	+306,205	+69.3%	$30.96	Q4 2020
9/30/2020	0.04%	+0.04%	$10.5M	442K	+442,155	NEW	$23.82	Q3 2020

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.