This PDF file includes:

• Initial conditions
  
• Additional details about S-type implantation
  
• Implantation of C-type asteroids driven by the gas giants’ growth
  
• fig. S1. Surface density profile of the underlying gas disc profile used in our simulations, drawn from hydrodynamical simulations (18).
  
• fig. S2. How 10 asteroids from different simulations were implanted into the belt.
  
• fig. S3. Efficiency with which planetesimals were implanted into the main asteroid belt in our simulations.
  
• fig. S4. Snapshots in the evolution of a simulation in which the giant planets’ growth implants planetesimals from the Jupiter-Saturn region as C-type asteroids.
  
• References (54–57)

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