diff --git a/coffer/units.py b/coffer/units.py
index c27fcdc..00c1f44 100644
--- a/coffer/units.py
+++ b/coffer/units.py
@@ -52,6 +52,7 @@ ACCOUNT_COFFER = "company:coffer"
 ACCOUNT_NEW_INTERNET = "company:new-internet-co"
 ACCOUNT_LEORA = "agent:leora"
 ACCOUNT_SIGIL = "company:sigil"
+ACCOUNT_ORBIT = "company:orbit"  # Orbit: open-source CRM for agents; founder agent:orbit
 
 
 def agent_account(agent_id: str) -> str:
diff --git a/tests/test_companies.py b/tests/test_companies.py
new file mode 100644
index 0000000..c5d23a7
--- /dev/null
+++ b/tests/test_companies.py
@@ -0,0 +1,19 @@
+import unittest
+
+from coffer.units import (
+    ACCOUNT_COFFER, ACCOUNT_ORBIT, ACCOUNT_SIGIL, agent_account, company_account,
+)
+
+
+class CompanyAccountsTest(unittest.TestCase):
+    def test_orbit_company_book_is_separate_from_founder(self):
+        self.assertEqual(ACCOUNT_ORBIT, "company:orbit")
+        self.assertEqual(company_account("orbit"), ACCOUNT_ORBIT)
+        self.assertNotEqual(ACCOUNT_ORBIT, agent_account("orbit"))
+
+    def test_company_ids_unique(self):
+        self.assertEqual(len({ACCOUNT_COFFER, ACCOUNT_SIGIL, ACCOUNT_ORBIT}), 3)
+
+
+if __name__ == "__main__":
+    unittest.main()