curl --request DELETE \
  --url https://app.concretehq.com/api/v1/funds/{fundPublicId}/companies \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "companyPublicIds": [
    "abc123def456",
    "654fed321cba"
  ]
}
'

{
  "error": "Not found"
}