| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 02/28/2022 | Montrose Environmental Group, Inc. | | Grant | Stock Option (Right to Buy) | 35.5k | $44.11 | $1.6M | | 02/28/2022 |
| 12/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 2.6k | $71.12 | $183.1k | | 12/23/2021 |
| 12/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 100 | $69.83 | $7k | | 12/23/2021 |
| 12/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 4.3k | $71.80 | $310.5k | | 12/23/2021 |
| 12/16/2021 | Montrose Environmental Group, Inc. | | Grant | Stock Appreciation Right | 330k | $66.79 | $22M | | 12/16/2021 |
| 12/16/2021 | Montrose Environmental Group, Inc. | | Grant | Common Stock | 225.9k | $0.00 | $0 | | 12/16/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 38k | $8.58 | $326k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 1.4k | $73.56 | $101.3k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 9.5k | $72.84 | $692.5k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 10.8k | $71.96 | $777.6k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 400 | $73.74 | $29.5k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 4.5k | $72.89 | $329.4k | | 11/30/2021 |
| 11/30/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 6.1k | $71.99 | $441.4k | | 11/30/2021 |
| 09/24/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 5k | $64.07 | $322.9k | | 09/23/2021 |
| 09/24/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 400 | $65.18 | $26.1k | | 09/23/2021 |
| 09/24/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 3.2k | $66.65 | $211.9k | | 09/23/2021 |
| 09/24/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 1.8k | $67.31 | $121.2k | | 09/23/2021 |
| 09/24/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 10.4k | $8.58 | $89.4k | | 09/23/2021 |
| 09/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 29.6k | $63.68 | $1.9M | | 09/23/2021 |
| 09/23/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 29.6k | $8.58 | $253.8k | | 09/23/2021 |
| 09/22/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 1.5k | $61.07 | $89.6k | | 09/21/2021 |
| 09/22/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 701 | $61.95 | $43.4k | | 09/21/2021 |
| 09/22/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 2.2k | $8.58 | $18.6k | | 09/21/2021 |
| 09/21/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 14k | $60.11 | $839.9k | | 09/21/2021 |
| 09/21/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 14k | $8.58 | $119.9k | | 09/21/2021 |
| 09/17/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 3k | $60.10 | $182.8k | | 09/15/2021 |
| 09/17/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 3k | $8.58 | $26.1k | | 09/15/2021 |
| 09/16/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 2.6k | $8.58 | $22.2k | | 09/15/2021 |
| 09/16/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 819 | $60.00 | $49.1k | | 09/15/2021 |
| 09/15/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 17.6k | $59.08 | $1M | | 09/15/2021 |
| 09/15/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 2.4k | $59.72 | $145.4k | | 09/15/2021 |
| 09/15/2021 | Montrose Environmental Group, Inc. | | Exercise | Stock Option (Right to Buy) | 20k | $8.58 | $171.6k | | 09/15/2021 |
| 03/18/2021 | Montrose Environmental Group, Inc. | | Grant | Stock Option (Right to Buy) | 10.6k | $47.72 | $504.1k | | 03/18/2021 |
| 02/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 1.6k | $46.37 | $76.5k | See Footnote | 02/23/2021 |
| 02/23/2021 | Montrose Environmental Group, Inc. | | Sale | Common Stock | 1.7k | $43.63 | $74.2k | See Footnote | 02/23/2021 |
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