Business-to-Business Identity and Access Management

Business-to-Business Identity and Access Management (B2B IAM) has emerged as a distinct market segment within IAM, aimed at securing and governing digital interactions across organizational boundaries rather than serving consumer or internal workforce needs. It addresses external enterprise identities—customers’ employees, supply chain partners, contractors, integrators, resellers, gig workers, and developers—who need access to critical portals, APIs, data services, and administrative interfaces under strong security and compliance expectations. Unlike traditional workforce IAM (centralized control) or CIAM (high-volume self-service and personalization), B2B IAM adds requirements for multi-organization governance, identity federation, contractual enforcement, and multi-level delegated administration so partner organizations can manage their own users without compromising the host.

Core capabilities include lifecycle management for external organizations and users (onboarding, provisioning, deprovisioning, revocation at relationship end), workflow orchestration that can embed identity verification (IDV), contract validation, sanctions screening, and external attribute checks, plus federated authentication through standards like SAML and OIDC with brokering and attribute normalization. Authorization needs go beyond RBAC into ABAC, PBAC, and ReBAC, applying contextual policies based on user attributes, organizational metadata, runtime signals (location, device posture), and contractual status with consistent enforcement across apps and APIs. Multitenancy and per-organization customization (branding, policy isolation, UI) and flexible deployments (mostly SaaS, but also single-tenant, hybrid, self-hosted) are important.

Key findings highlight rapid market growth, strong MFA often brokered through partner IdPs, frequent gaps in fine-grained authorization and KYB support, and limited native embedding of IDV, HR background checks, and watchlist screening—an increasingly problematic gap amid fraud and espionage risks. Leadership evaluations identify Overall Leaders including 1Kosmos, cidaas, Exostar, LoginRadius, Microsoft, Okta, Ping Identity, and WSO2, with Microsoft leading Market Leadership by a wide margin.

• The Leadership Compass edition evaluates only B2B IAM and excludes consumer, citizen, and workforce identity use cases.
• B2B IAM external identities include users from customer organizations, supply chain partners, integrators, contractors, resellers, gig workers, and external developers.
• Federated authentication is a core requirement for B2B IAM platforms.
• B2B IAM commonly uses RBAC and ABAC, with PBAC and ReBAC increasingly present in products.
• Organization-level identifiers such as the Legal Entity Identifier (LEI) can be linked to contracts, compliance attestations, or SLAs.
• Most surveyed vendors assert that B2B IAM is their fastest growing segment.
• SaaS is the primary delivery model for B2B IAM, and eleven vendors do not offer on-premises options.
• Microsoft leads B2B IAM market size, followed by Okta and Ping Identity.
• Overall Leaders listed are 1Kosmos, cidaas, Exostar, LoginRadius, Microsoft, Okta, Ping Identity, and WSO2.
• KYB is not well supported in vendor solutions yet and often requires customization.

• “B2B IAM has coalesced into an independent branch of IAM, sharing characteristics of both workforce and consumer IAM, but having different technical requirements that are not met by previous generations of enterprise IAM and CIAM solutions.”
• “Orchestration interfaces must support complex onboarding scenarios.”
• “Federated authentication is a core requirement for B2B IAM platforms.”
• “Identity lifecycle and governance features are imperative to reduce supply chain identity risks.”
• “RBAC is basic; ABAC, PBAC, and ReBAC are needed for hierarchical delegated administration over digital estates accessed by multiple customer/partner/contractor entities, which is a top requirement for many organizations.”
• “Some solutions have well-thought-out fine-grained access controls to support collaborative work environments, but most do not, which sometimes require significant customization on the part of operators.”
• “Know Your Business (KYB) is not well supported in vendor solutions yet, often requiring customization to accomplish.”
• “This gap is increasingly problematic, given the growing number of cases involving unauthorized remote workers, fraudulent employment schemes, and corporate and state-sponsored espionage operations.”
• “B2B IAM has become a foundational element in modern digital transformation initiatives.”
• “Selecting a vendor of a product or service must not be based only on the information provided in this KuppingerCole Leadership Compass.”