The IBM Watson AI XPRIZE had 32 competitors from 10 countries in Round 3. Round 3 took place in 2019 and culminated with the selection of 10 semifinalists.
| Team Name | Location |
| A.S.I.M.o.V. | Monreale, Italy |
| Aifred Health | Montreal, Canada |
| AITera Inc. | Quebec City, Canada |
| AMIKO AI | Milan, Italy |
| Arterys | San Francisco, United States |
| Autism BuddyBot | Cupertino, United States |
| Behaivior | Pittsburgh, United States |
| Brown HCRI | Providence, United States |
| Choosito! | Philadelphia, United States |
| CwC | Hoboken, United States |
| Deep Drug | Baton Rouge, United States |
| deepc | Munich, Germany |
| Element Inc | New York, United States |
| emPrize | Atlanta, United States |
| Iris.ai | Oslo, Norway |
| Global A.I. | New York , United States |
| Learn Leap Fly | Ottawa, Canada |
| Lili.ai | Paris, France |
| MachineGenes | Brisbane, Australia |
| Marinus Analytics | Pittsburgh, United States |
| Mercury Orbit Music | Los Angeles, United States |
| Nectar Technologies | Montreal, Canada |
| OPTOSS AI | Amsterdam, Netherlands |
| Orbem.ai | Munich, Germany |
| Spock | Mountain View, United States |
| T2H20 | Irvine, United States |
| Mt. Cleverest | Jersey City, United States |
| CleanRobotics | Pittsburgh, United States |
| TwynBrain | Penarth, United Kingdom |
| uOttawa-AI | Ottawa, Canada |
| Wadhwani AI | Mumbai, India |
| Zzapp Malaria | Tel Aviv, Israel |