diff --git a/packages/shared/src/index.ts b/packages/shared/src/index.ts
index 5893eac..fcdaa07 100644
--- a/packages/shared/src/index.ts
+++ b/packages/shared/src/index.ts
@@ -1,4 +1,5 @@
-export type { Role, User, Session, SessionOrNull } from "./types";
+export type { Role, User, Session, SessionOrNull, InstitutionalTier, InstitutionalMember } from "./types";
+export { institutionalTierLabels, institutionalMembers } from "./types";
 export type { NavItem, PortalId } from "./nav";
 export {
   baseNavItems,
diff --git a/packages/shared/src/types.ts b/packages/shared/src/types.ts
index fc417f6..93578f7 100644
--- a/packages/shared/src/types.ts
+++ b/packages/shared/src/types.ts
@@ -26,3 +26,126 @@ export interface Session {
 }
 
 export type SessionOrNull = Session | null;
+
+/**
+ * Institutional membership tiers — canonical taxonomy from d-bis.org/members#tiers.
+ * Corrected 2026-04:
+ *   - MLFO is "global_family_office", NOT "sovereign_central_bank"
+ *   - BIS Innovation Hub removed from directory entirely
+ *   - Added: ICCC (oversight_judicial), SAID & PANDA (standards_body),
+ *     XOM/Order of Hospitallers (delegated_authority), BRICS central banks
+ */
+export type InstitutionalTier =
+  | "sovereign_central_bank"
+  | "global_family_office"
+  | "settlement_member"
+  | "infrastructure_operator"
+  | "oversight_judicial"
+  | "delegated_authority"
+  | "standards_body";
+
+export const institutionalTierLabels: Record<InstitutionalTier, string> = {
+  sovereign_central_bank: "Sovereign Central Bank",
+  global_family_office: "Global Family Office",
+  settlement_member: "Settlement Member",
+  infrastructure_operator: "Infrastructure Operator",
+  oversight_judicial: "Oversight & Judicial",
+  delegated_authority: "Delegated Authority",
+  standards_body: "Standards Body",
+};
+
+export interface InstitutionalMember {
+  slug: string;
+  abbreviation: string;
+  name: string;
+  tier: InstitutionalTier;
+  description: string;
+  jurisdiction?: string;
+  lei?: string;
+  latitude?: number;
+  longitude?: number;
+  mapLabel?: string;
+}
+
+/**
+ * Canonical member directory — source of truth for all portals.
+ * Each portal (DBIS, ICCC, OMNL, XOM) renders from this shared data.
+ */
+export const institutionalMembers: InstitutionalMember[] = [
+  {
+    slug: "omnl",
+    abbreviation: "OMNL",
+    name: "Organisation Mondiale du Numérique",
+    tier: "sovereign_central_bank",
+    description:
+      "Participating central bank — OMNL Head Office ledger and journal operator (Fineract / OMNL tenant). ARIN OrgId: OMNL.",
+    jurisdiction: "International / participating monetary union",
+    lei: "98450070C57395F6B906",
+    latitude: 39.61,
+    longitude: -104.89,
+    mapLabel: "Greenwood Village, CO",
+  },
+  {
+    slug: "mlfo",
+    abbreviation: "MLFO",
+    name: "Mann Li Family Office",
+    tier: "global_family_office",
+    description:
+      "Founding family office (L.P.B.C., Colorado Entity 20241969162). Capital structure sponsor and BIS debit performance beneficiary. Registered agent: Pandora C. Walker.",
+    jurisdiction: "US-CO (Colorado)",
+    latitude: 40.02,
+    longitude: -105.27,
+    mapLabel: "Boulder, CO",
+  },
+  {
+    slug: "defi-oracle",
+    abbreviation: "DFO",
+    name: "DeFi Oracle",
+    tier: "infrastructure_operator",
+    description:
+      "Infrastructure operator for Chain 138 ecosystem. Manages smart contract deployment (131 contracts), cross-chain bridges, PMM pools, and wallet integrations (MetaMask Snap, Ledger Live).",
+    jurisdiction: "US-CO (Colorado)",
+    latitude: 39.61,
+    longitude: -104.89,
+    mapLabel: "Greenwood Village, CO",
+  },
+  {
+    slug: "iccc",
+    abbreviation: "ICCC",
+    name: "International Criminal Court of Commerce",
+    tier: "oversight_judicial",
+    description:
+      "International court with oversight authority over DBIS ecosystem commercial disputes and enforcement.",
+    jurisdiction: "International",
+  },
+  {
+    slug: "said",
+    abbreviation: "SAID",
+    name: "SAID",
+    tier: "standards_body",
+    description:
+      "Standards and identity body within the DBIS institutional framework.",
+    jurisdiction: "International",
+  },
+  {
+    slug: "panda",
+    abbreviation: "PANDA",
+    name: "PANDA",
+    tier: "standards_body",
+    description:
+      "Standards and coordination body within the DBIS institutional framework.",
+    jurisdiction: "International",
+  },
+  {
+    slug: "xom",
+    abbreviation: "XOM",
+    name: "Sovereign Military Hospitaller Order of St. John of Jerusalem of Rhodes and of Malta",
+    tier: "delegated_authority",
+    description:
+      "The sovereign entity (Order of Hospitallers) extending DBIS the agency authority under which it operates. Recognised UN observer state.",
+    jurisdiction: "International (Rome)",
+    latitude: 41.9,
+    longitude: 12.48,
+    mapLabel: "Rome, Italy",
+  },
+];