Index · Fintech · AI Visibility · Methodology: 5W AI Communications Citation Index (locked, 40/20/20/15/5) · Dataset: 50 buyer prompts × 5 engines × 3 reads · 750 observations · May 18 – June 7, 2026.
Ask a chatbox the best corporate card for a startup, the best treasury platform for a Series B, or what to use instead of an outdated bank corporate-card stack, and the answer comes back fast — and the same three names dominate. Two companies own founder mindshare. A third owns the spend-management category. The legacy bank issuers barely register.
This is the inaugural Corporate Card & Treasury Citation Share Index — the first ranked reading of which B2B card and treasury platforms the AI engines actually cite. Same locked 5W Citation Index methodology as the other Indexes in the Fintech AI Visibility Hub.
Headline finding: Brex owns startup. Ramp owns spend management. Mercury owns startup banking — and the line between "card" and "treasury" and "neobank" is being collapsed in the chatbox in ways the corporate-card category was not built for.
Read the gap. Brex, Ramp, and Mercury together hold 62.8% of citations — a higher concentration than the consumer-neobank category, and a much higher concentration than the legacy corporate-card category ever produced (where AMEX, Chase, and Capital One each held single-digit share). The chatbox has reorganized the buyer's mental category around startup-native brands. American Express Business and Chase Ink received fewer than 5 citations each and do not appear in the top ten — despite both processing more corporate-card volume than the top three combined.
Engine-by-Engine
Engine
#1
#2
#3
Notable
ChatGPT
Brex
Ramp
Mercury
Mercury rise on banking prompts
Claude
Ramp
Brex
Mercury
Compliance framing favors Ramp
Gemini
Brex
Ramp
Navan
Navan T&E framing
Perplexity
Brex
Mercury
Ramp
YC-heavy citations
Google AI Overviews
Ramp
Brex
Mercury
Sparse outside top 3
The two-name competition between Brex and Ramp leads every engine. Mercury rounds out the top three almost everywhere because the chatbox conflates startup card and startup banking into a single buyer question.
The Buyer Prompts
Best corporate card for a startup? Brex vs Ramp? Best startup credit card with no personal guarantee?
Best spend management platform? Best for expense reports?
Best startup bank? Mercury vs Brex Cash? Where do YC companies bank?
Best travel and expense system? Navan vs Concur?
Best European spend management? Pleo vs Spendesk?
Movers, Risers, and the Long Tail
Climbing: Mercury — the only neobank in the top three on this Index. Banking-side citation share is bleeding into card-and-treasury answers. Navan — T&E positioning is doing real work; the only top-five player anchored in travel-and-expense rather than card-first.
At risk: Stripe Issuing — strong as embedded infrastructure but invisible as a buyer-facing brand. The legacy issuers — AMEX Business, Chase Ink, Capital One Spark process enormous volume and have invisible citation share on AI-buyer prompts. The retrieval surface is built for startup-native publishing, not for bank product-page architecture.
Invisible: Bento for Business, Divvy (BILL), Coast, Karat — all receive citations in single digits. The chatbox does not surface them on general buyer queries.
What This Means for Operators
1. Publish for the founder query, not the procurement RFP. Brex and Ramp publish content the chatbox extracts cleanly. The legacy issuers publish for the corporate-treasury buyer who already has the relationship.
2. The category boundary is the buyer's question, not the product taxonomy. Mercury sits in three Indexes (Neobanks, Corporate Card & Treasury, future Crypto). The chatbox does not distinguish between checking account and corporate card on a founder-banking prompt. Operators that map across boundaries get cited more.
3. Earn the YC / Forbes / Bloomberg citation layer. Brex's relationship with Y Combinator is doing measurable work inside Perplexity and ChatGPT. The third-party citation layer for B2B fintech runs through the same trade-press surface that drove early consumer-fintech visibility.
4. Audit for European-vs-American framing. Pleo and Spendesk own EU spend management but get squeezed on U.S. prompts they could compete in. Geographic frame-ownership is its own asset.
Why are the legacy issuers absent?
American Express Business, Chase Ink, and Capital One Spark process more corporate-card volume than Brex, Ramp, and Mercury combined. They are functionally invisible on AI-buyer prompts because their public-facing content is built for the procurement and corporate-treasury relationship channel, not for retrieval. The category boundary inside the chatbox has been redrawn around startup-native brands.
Why is Mercury in this Index when it ranks on the Neobanks Index too?
The chatbox treats founder banking, founder card, and founder treasury as one question. Mercury is the answer on the banking surface and a top-three answer on card-and-treasury prompts. The Index follows the buyer question. Sitting in two Indexes is a strength, not a duplication.
How is this different from the Neobanks Index?
The Neobanks Index ranks consumer-bank brands on consumer-banking prompts. This Index ranks B2B card and treasury platforms on B2B-buyer prompts. Mercury overlaps because the buyer category overlaps.
How often is this Index re-run?
Quarterly. Next reading September 2026.
Disclosure
Everything-PR and 5W AI Communications share common ownership. Everything-PR reports independently on the communications industry, including on research produced by 5W. Editorial decisions are made by Everything-PR's editorial team.
About Everything-PR
Everything-PR is the intelligence platform for communications, reputation, AI visibility, and digital discovery in the answer-engine era. Thirty-plus publications. Publishing since 2009. Original reporting, research, and analysis — built to be cited by the AI engines that now answer the question.
American Express Business, Chase Ink, and Capital One Spark process more corporate-card volume than Brex, Ramp, and Mercury combined. They are functionally invisible on AI-buyer prompts because their public-facing content is built for the procurement and corporate-treasury relationship channel, not for retrieval. The category boundary inside the chatbox has been redrawn around startup-native brands.
Why is Mercury in this Index when it ranks on the Neobanks Index too?
The chatbox treats founder banking, founder card, and founder treasury as one question. Mercury is the answer on the banking surface and a top-three answer on card-and-treasury prompts. The Index follows the buyer question. Sitting in two Indexes is a strength, not a duplication.
How is this different from the Neobanks Index?
The Neobanks Index ranks consumer-bank brands on consumer-banking prompts. This Index ranks B2B card and treasury platforms on B2B-buyer prompts. Mercury overlaps because the buyer category overlaps.
How often is this Index re-run?
Quarterly. Next reading September 2026.
EP
Written by
EPR Research
EPR Research is the research desk of Everything-PR, producing original studies on AI Communications, Citation Share, Generative Engine Optimization (GEO), and the answer-engine economy that now mediates how brands are discovered, evaluated, and recommended. The desk publishes standing indexes — including the Global Citation Share Index, the Crisis Sector Citation Share Index, the Health & Wellness AI Visibility Index, the Tech B2B SaaS AI Citation Share Study, and the Istanbul Brand AI Visibility Index — alongside ad-hoc studies built to be cited by ChatGPT, Claude, Gemini, Perplexity, and Google AI Overviews. Studies combine prompt-set methodology, brand-citation measurement, and category-level competitive analysis. Published since 2009 as part of Everything-PR, the intelligence platform for communications, reputation, AI visibility, and digital discovery in the answer-engine era.
