Brex Inc. vs Carta, Inc.: Strategic Comparison

This in-depth comparison examines Brex Inc. and Carta, Inc. across revenue, market value, business model, competitive positioning, and long-term growth strategy. Whether you are researching Brex Inc. on its own, evaluating Carta, Inc., or weighing the two companies side by side, the breakdown below highlights where each company leads and where the gap between Brex Inc. and Carta, Inc. is widest.

On the headline numbers, annual revenue is N/A for Brex Inc. and $442.0M (unaudited) (FY2024) for Carta, Inc., while their respective market capitalizations stand at N/A and N/A. Both Brex Inc. and Carta, Inc. are headquartered in United States. Their local markets and applicable rules may still differ.

Brex Inc.: Brex started with a simple problem: newly funded startups had cash in the bank but no credit history, so banks asked founders for personal guarantees or deposits before issuing a corporate card. Brex set card limits from the company's cash balance instead, signed up more than 1,000 customers within months of its 2018 launch, and added cash accounts, bill pay, travel and expense software over the next six years. It moved upmarket in 2022, cut costs hard in 2024, and in 2026 became part of Capital One. The company is headquartered in San Francisco, California.

Carta, Inc.: Carta is the system of record for who owns what in private companies and funds. Founders use it to issue options and model funding rounds, employees use it to see and exercise their equity, and VC, PE, and private credit managers use it to run fund accounting and LP reporting. That position between companies and investors is what lets Carta sell valuations, fund administration, and legal services. The company is headquartered in San Francisco, California.

Brex Inc. and Carta, Inc. pursue distinct approaches to generating revenue, and understanding how each company operates is the foundation of any fair comparison between Brex Inc. and Carta, Inc..

Brex Inc. business model: Brex makes most of its money from interchange, the fee a merchant's bank pays each time a Brex card is used. Sacra estimates Brex collects about 2.7% of card volume as gross revenue and keeps roughly 65% gross margin after paying its issuing and network partners. Software is a growing second stream: Brex Essentials is free, while Brex Premium costs $12 per user per month and adds approval chains, live budgets, AI expense audits and travel policies. Brex also earns fees from the partner banks and funds that hold customer cash, and transaction revenue from bill pay. The card is the entry point; software, banking and payments are sold as the customer grows.

Carta, Inc. business model: Carta sells annual software subscriptions plus service fees on both sides of the private market. Companies pay for cap table management, equity plan administration, and 409A valuations, with prices rising as stakeholder counts and funding stages grow. Investment firms pay for Fund ERP products: fund administration (software plus dedicated fund accountants), fund tax and K-1s, portfolio valuations, CRM, forecasting, and loan operations for private credit. Since May 2026, Carta Law adds outcome-based legal and compliance work such as NDAs, KYC, investor onboarding, and LP transfers. Sacra estimates that in 2023 cap tables and 409A valuations made up about 67% of ARR, fund administration about 27%, and private equity products about 5%. Carta shut its secondary trading business in January 2024, so brokerage is no longer part of the model.

The durability of a company's moat often decides long-term winners. Here is how the competitive advantages of Brex Inc. stack up against those of Carta, Inc..

Brex Inc. competitive advantage: Brex's main technical advantage is its own card-issuing stack. It integrated directly with Mastercard rather than relying on a third-party processor, which lets it issue local corporate cards, settle in local currency and reimburse employees in more than 50 countries. That matters to multinational customers such as Anthropic, Arm and Robinhood. Since April 2026 it also has Capital One's balance sheet, brand and distribution behind it, plus a $950 million investment the bank said it would make in Brex.

Carta, Inc. competitive advantage: Carta's main advantage is its two-sided network. Startups put investors on their Carta cap tables, investors adopt Carta for fund administration, and those funds steer portfolio companies to Carta. As a registered transfer agent holding the legal record of ownership, Carta is also costly to leave: switching means migrating years of grants, vesting schedules, and investor records. Its cap table data feeds 409A valuations, compensation benchmarks, and portfolio valuations for funds.

Future prospects matter as much as current results. The growth strategies below explain how Brex Inc. and Carta, Inc. each plan to expand from here.

Brex Inc. growth strategy: Brex's growth since 2024 has come from enterprise customers, international companies and partners. It serves more than 300 public companies, holds an EU payment institution licence obtained in August 2025, and distributes its cards through other software: Brex Embedded partners include Navan, Zip, Coupa and Sabre, and Brex is the default commercial card for Fifth Third Bank's commercial clients, according to Sacra. Under Capital One, the plan is to reach far more mainstream US businesses through the bank's distribution.

Carta, Inc. growth strategy: Carta grows by selling more products to the firms already on its ledger. The playbook is to take a professional service (409A valuations, fund accounting, legal work), automate it, and tie the output to Carta's system of record. Fund ERP bundles fund administration, fund tax, portfolio valuations, data collection, forecasting, and CRM. Acquisitions fill gaps: Tactyc (fund forecasting), Sirvatus (private credit loan operations, October 2025), Accelex (AI data extraction, October 2025), ListAlpha (CRM), and Avantia (legal and compliance, May 2026).

A closer look at the financial trajectory of Brex Inc. and Carta, Inc. rounds out the comparison.

Brex Inc.: Brex never published audited results as a private company. Sacra estimates annualized revenue slowed to $312 million in 2022, growing 30%, while the company was reportedly burning about $22 million a month. After the January 2024 restructuring, growth picked up: Brex said in February 2025 that enterprise revenue rose 80% with net revenue retention near 140%, and Sacra estimates total annualized revenue reached $700 million in August 2025, up 50%. Brex turned operating-cash-flow positive for the first time in October 2025, according to Sacra. Before the sale it raised about $2.3 billion in equity. Capital One paid $5.15 billion, roughly 58% below the $12.3 billion valuation of 2021.

Carta, Inc.: Carta does not publish audited financials. Henry Ward has said the company was approaching $500 million in annual recurring revenue in 2025. Sacra estimates revenue of about $373 million in 2023, $442 million in 2024 (+19%), and $515 million in 2025 (+16.5%), with growth slowing after the end of zero-rate venture funding. Carta raised its last primary round, a $500 million Series G led by Silver Lake and Lightspeed, at a $7.4 billion valuation in August 2021; a January 2022 employee secondary sale reportedly priced it at $8.5 billion. Total equity funding is roughly $1 billion.