| ASTM International LLC | Disregarded entity | ASTM standards activities/membership(ASIA & united kingdom) | DE | 412221144 |
| ASTM International EU LLC | Disregarded entity | ASTM standards activities/membership(europe & middle EAST) | DE | 452060975 |
| ASTM Chapter Conferences ORG-SOLE Proprietorship | Disregarded entity | ASTM standards activities/membership(united ARAB emirates) | — | — |
| Safety Equipment Institute INC | Related tax-exempt org | Safety test | PA | 541170360 |
| Test Monitoring Center | Related tax-exempt org | Monitoring center | PA | 844963663 |
| ASTM International LLC Beijing CO LTD | Related taxable corporation/trust | ASTM standards activites/membership | — | — |
| ASTM ASIA Pacific Limited | Related taxable corporation/trust | ASTM standards activities/membership | — | — |
| ASTM International UK | Related taxable corporation/trust | ASTM standards activities/membership | — | — |