US corporate cards, NOT deposit accounts.

This is the single most-misread fact in the US corporate-card category: Ramp, Brex, Rho, and Airbase are not chartered banks. The cards they issue are charge cards — credit instruments settled in full each statement period — not deposit accounts. The FDIC framework does not apply to charge-card credit lines at any of the four. Press coverage and competitor comparisons routinely blur the structural distinction; the result is mis-sized treasury policy and uninsured operating-cash exposure.

The four platforms each operate under partner-bank arrangements with different sponsor banks. Ramp Card is issued by Sutton Bank (Ohio state-chartered, Member FDIC) under Visa USA Inc. sponsorship. Brex Card is issued by sponsor banks including Column N.A. + JPMorgan. Rho Corporate Card is issued via Webster Bank, N.A. (Connecticut state-chartered, Member FDIC). The sponsor banks themselves are FDIC-member institutions, but the FDIC cover protects the sponsor banks' depositors — not the cardholders. A charge-card balance is a liability of the cardholder, not an insured deposit of the cardholder.

Two of the three top-ranked platforms — Brex and Rho — sell separate FDIC-insured deposit products alongside their corporate cards (Brex Cash via Choice / Lead / Citi sweep, Rho Banking via Webster Bank with $75M sweep). Those deposit products are real partner-bank FDIC-pass-through accounts, structurally different from the cards themselves. Ramp Business Account is the equivalent at Ramp but in beta with limited rollout as of 2026. For an operating-cash deposit relationship, use the paired deposit product (Brex Cash, Rho Banking) or a separate deposit-bank relationship (Mercury, Bluevine, a chartered bank) — not the corporate-card line.

Ramp ranks first because the policy engine enforces spend rules at the point of authorisation — a swipe outside policy is declined by Visa, not flagged in a report — and Ramp Procurement (intake-to-pay vendor management) plus SaaS-subscription management is the deepest in the category. Brex ranks second for VC-backed teams that want the card + Brex Cash deposit + Brex Empower spend-management stack in one platform with the YC-cohort onboarding path paved. Rho ranks third for multi-entity holding-company finance teams that want the card + real FDIC-insured Rho Banking operating account + AP automation stack with multi-entity consolidation as a first-class surface.

For finance teams where policy enforcement and procurement depth matter most: Ramp. The policy-engine-at-swipe is the structural moat, and Ramp Procurement is the only intake-to-pay surface in the top 3. Mid-market companies running NetSuite, Sage Intacct, or Microsoft Dynamics get the deepest integration set.

For venture-funded startups wanting card + deposit + treasury in one stack: Brex. Brex Cash is a mature FDIC-pass-through deposit account ($6M sweep) and the YC-cohort onboarding path is paved. The structural trade-off versus Mercury is that Brex emphasises the card-first stack; the operating-account-first structural alternative is Mercury + Ramp.

For multi-entity holding-company finance: Rho. Multi-entity consolidation is a first-class product surface, and Rho Banking ($75M Treasury sweep via Webster Bank) is structurally distinct from Ramp Business Account (beta). The trade-off versus Brex is that Rho is built specifically for holding-company finance teams managing 2-10+ subsidiaries; Brex is more single-entity-focused at the equivalent tier.

The two-platform stack is increasingly common: Mercury (or Brex Cash, or Rho Banking) for the operating account and FDIC-insured cash leg, plus Ramp for the spend-management + procurement surface. Growth-stage finance teams above ~50 employees with active vendor negotiation typically run this exact pattern.

Are corporate cards from Ramp / Brex / Rho FDIC-insured?

No — the cards themselves are charge cards, not deposit products, and FDIC insurance does not apply to charge-card credit lines at any of the three. The structural distinction matters: Brex and Rho also sell separate FDIC-insured deposit products (Brex Cash, Rho Banking) alongside their charge cards, and those deposit products DO carry FDIC pass-through cover. Ramp Business Account is the equivalent at Ramp but is in beta with limited rollout as of 2026. For an FDIC-insured operating account, hold cash at the deposit product (Brex Cash, Rho Banking) or a separate deposit-bank relationship (Mercury, Bluevine, a chartered bank) — not on the corporate-card line itself.

Why is the "not a deposit product" disclosure important?

Because press coverage and competitor comparisons routinely blur the structural distinction. A charge card is a credit instrument issued under partner-bank sponsorship (Sutton Bank for Ramp, Column N.A. + JPMorgan for Brex, Webster Bank for Rho); the card "balance" is an outstanding obligation owed by the cardholder, not insured deposits owed to the cardholder. Confusing the two leads to mis-sized treasury policy and uninsured operating-cash exposure. Every Ramp / Brex / Rho review on this site leads the safety section with the "not a deposit product" disclosure for that reason.

Which platform has the deepest spend-policy engine?

Ramp by a wide margin. The Ramp policy engine enforces spend rules at the point of authorisation — a swipe outside policy is declined by Visa, not flagged in a report — and Ramp Procurement (intake-to-pay vendor management) closes the loop on SaaS-spend management. Brex Empower closed much of the gap through 2024-2025 but still lags Ramp on mid-market ERP integration depth and procurement-savings-share. Rho ships strong card-level spend controls but does NOT have a procurement intake-to-pay surface. For finance teams where policy-enforcement-at-swipe and procurement depth are deciding factors, Ramp. For teams that want the card + deposit + treasury stack in one platform with VC-cohort onboarding paved, Brex. For multi-entity holding-company finance, Rho.

How does Airbase fit alongside Ramp / Brex / Rho?

Airbase is the fourth player in the US corporate-card + spend-management category, positioned squarely against Ramp on procurement-depth and bill-pay-automation. Airbase historically has been an enterprise-tier-first product with smaller mid-market footprint than Ramp / Brex / Rho. Acquisition by Paylocity in 2024 has folded Airbase's spend-management surface into a broader HR + finance platform, which changed the structural positioning. For a finance team already on Paylocity for payroll, Airbase has natural integration value; for standalone evaluation against Ramp on procurement depth, Ramp typically wins on the SMB-customer UX surface.

For finance teams where automated expense-policy enforcement, AP automation, and procurement intake-to-pay are the deciding factors, Ramp is the structural fit — the policy engine and procurement product are the deepest in the category, and the mid-market ERP integration set (NetSuite, Sage Intacct, Microsoft Dynamics) is the strongest. For venture-funded startups wanting the card + deposit + treasury stack in one platform, Brex. For multi-entity holding-company finance teams managing 2-10+ subsidiaries, Rho. Confirm the structural distinction before committing operating cash — these are corporate-card platforms, not deposit-taking banks, and the FDIC framework applies to the paired deposit products (Brex Cash, Rho Banking) rather than the cards themselves.