Onterris, Inc. Subsidiaries
Every subsidiary the company listed in Exhibit 21 of its annual reports, newest list first (6 lists). Names and jurisdictions are as filed.
- 2026-02-26: Subsidiary Emerging Compounds Treatment Technologies, Inc.; Jurisdiction Massachusetts.
- 2026-02-26: Subsidiary Enthalpy Analytical, LLC; Jurisdiction Delaware.
- 2026-02-26: Subsidiary Environmental Standards, Inc.; Jurisdiction Pennsylvania.
- 2026-02-26: Subsidiary Epic Environmental Pty Ltd; Jurisdiction Australia.
| Annual report filed | Subsidiary | Jurisdiction |
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| 2026-02-26 | Emerging Compounds Treatment Technologies, Inc. | Massachusetts |
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| 2026-02-26 | Enthalpy Analytical, LLC | Delaware |
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| 2026-02-26 | Environmental Standards, Inc. | Pennsylvania |
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| 2026-02-26 | Epic Environmental Pty Ltd | Australia |
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| 2026-02-26 | FRS Environmental Remediation, Inc. | Florida |
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| 2026-02-26 | Montrose Air Quality Services, LLC | Delaware |
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| 2026-02-26 | Montrose Environmental Group AB | Sweden |
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| 2026-02-26 | Montrose Environmental Group GmbH | Germany |
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| 2026-02-26 | Montrose Environmental Group Ltd. | British Columbia |
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| 2026-02-26 | Montrose Environmental Group BV | Belgium |
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| 2026-02-26 | Montrose Environmental Solutions Canada Inc. | Alberta |
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| 2026-02-26 | Montrose Environmental Solutions, Inc. | Delaware |
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| 2026-02-26 | Montrose Foreign Holdings, Inc. | Delaware |
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| 2026-02-26 | Montrose Government Solutions, Inc. | Delaware |
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| 2026-02-26 | Montrose Measurements and Analytics, LLC | Delaware |
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| 2026-02-26 | Montrose Services, LLC | Delaware |
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| 2026-02-26 | Montrose Water and Sustainability Services, Inc. | Delaware |
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| 2026-02-26 | MSE Group, LLC | Texas |
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| 2026-02-26 | PARS Environmental, Inc. | New Jersey |
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| 2026-02-26 | SensibleIOT, LLC | California |
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| 2026-02-26 | Spirit Environmental, LLC | Texas |
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| 2026-02-26 | Sustainable Treatment Solutions, Inc. | New York |
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| 2026-02-26 | The Center for Toxicology and Environmental Health, L.L.C. | Arkansas |
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| 2026-02-26 | Two Dot Consulting, LLC | Colorado |
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