몬트로스 환경 그룹, Inc.
US ˙ NYSE ˙ US6151111019
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SecurityMEG / Montrose Environmental Group, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership508,809 shares
Latest Disclosed Value $ 11,137,852
Morgan Stanley reports 9.13% decrease in ownership of MEG / Montrose Environmental Group, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 508,809 shares of Montrose Environmental Group, Inc. (US:MEG) valued at $11,137,829 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 559,918 shares of Montrose Environmental Group, Inc.. This represents a change in shares of -9.13% during the quarter. The current value of the position is $11,265,031 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 508,809 -51,109 -9.13 11,138 -19.89 0.0007
2026-05-27 2025-12-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 559,918 75,419 15.57 13,903 4.49 0.0008
2026-02-13 2025-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 559,918 75,419 13,903 0.0008
2026-05-27 2025-09-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 484,499 249,975 106.59 13,304 159.19 0.0008
2025-11-14 2025-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 484,499 249,975 13,304 0.0008
2025-08-15 2025-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 234,524 -60,650 -20.55 5,134 21.95 0.0003
2025-05-15 2025-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 295,174 -133,075 -31.07 4,209 -47.02 0.0003
2025-05-15 2024-12-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 428,249 80,252 23.06 7,944 -13.20 0.0006
2025-02-14 2024-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 428,249 80,252 7,944 0.0006
2025-05-14 2024-09-30 13F/A-2 MONTROSE ENVIRONMENTAL GROUP COM 615111101 347,997 67,129 23.90 9,152 -26.87 0.0007
2025-02-14 2024-09-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 347,997 67,129 9,152 0.0007
2024-11-14 2024-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 347,997 67,129 9,152 0.0001
2025-05-14 2024-06-30 13F/A-2 MONTROSE ENVIRONMENTAL GROUP COM 615111101 280,868 150,080 114.75 12,516 144.34 0.0010
2024-10-17 2024-06-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 280,868 150,080 12,516 0.0010
2024-08-14 2024-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 280,868 150,080 12,516 0.0010
2024-10-17 2024-03-31 13F/A-2 MONTROSE ENVIRONMENTAL GROUP COM 615111101 130,788 -113,714 -46.51 5,123 -34.79 0.0004
2024-08-16 2024-03-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 130,788 -113,714 5,123 0.0000
2024-05-15 2024-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 130,788 -113,714 5,123 0.0004
2024-08-16 2023-12-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 244,502 70,546 40.55 7,856 54.35 0.0007
2024-02-13 2023-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 244,502 70,546 7,856 0.0007
2023-11-15 2023-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 173,956 -2,374 -1.35 5,090 -31.48 0.0005
2023-08-14 2023-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 176,330 -11,886 -6.32 7,427 10.64 0.0007
2023-05-15 2023-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 188,216 33,673 21.79 6,714 -2.14 0.0007
2023-02-14 2022-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 154,543 -9,702 -5.91 6,860 24.14 0.0008
2022-11-14 2022-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 164,245 6,008 3.80 5,526 3.41 0.0008
2022-10-27 2022-06-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 158,237 -60,165 -27.55 5,344 -53.77 0.0007
2022-08-15 2022-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 158,237 -60,165 5,344 0.0001
2022-10-27 2022-03-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 218,402 118,004 117.54 11,559 63.29 0.0016
2022-05-13 2022-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 218,402 118,004 11,559 0.0016
2022-02-14 2021-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 100,398 29,402 41.41 7,079 61.47 0.0009
2021-11-15 2021-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 70,996 -91,617 -56.34 4,384 -49.76 0.0006
2021-08-23 2021-06-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 162,613 154,343 1,866.30 8,726 2,002.65 0.0012
2021-08-16 2021-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 162,613 154,343 8,726 0.0002
2021-05-17 2021-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 8,270 -5,603 -40.39 415 -3.49 0.0001
2021-02-16 2020-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 13,873 -1,077 -7.20 430 20.79 0.0001
2020-11-13 2020-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 14,950 14,950 356 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.