Slash Hits $1.4B Unicorn Valuation With $100M Series C, Launches Twin AI 'Chief of Staff' (April 2026)

Slash, a San Francisco-based business-banking startup backed by Y Combinator, announced on April 16, 2026 that it had closed a $100 million Series C at a $1.4 billion valuation, crossing unicorn status and lifting its total funding to more than $160 million. The round was led by Ribbit Capital and co-led by Khosla Ventures and returning backer Goodwater Capital. Alongside the funding, Slash launched Twin, an AI financial agent pitched as an "AI Chief of Staff" that can execute payments, issue invoices, and manage cards directly on behalf of customers.

What Happened

Slash disclosed the round in an official company blog post on April 16, 2026. Ribbit Capital led the round; Khosla Ventures and Goodwater Capital co-led; New Enterprise Associates and Y Combinator each participated for the fourth consecutive time. The $1.4 billion post-money is roughly 3.8× the company's $370 million Series B valuation from May 2025.

Slash was founded in 2020 by co-CEO Victor Cardenas and CTO Kevin Bai, who were both 19 at the time and dropped out of Stanford and the University of Waterloo respectively. The company pivoted into business banking after earlier attempts (one famously built around Kanye West merchandise) failed to gain traction. Today the platform offers checking accounts with up to 3.82% yield, unlimited physical and virtual corporate cards, stablecoin rails, and treasury management, built on top of banking-as-a-service provider Column.

The defining moment of the announcement was the launch of Twin. Rather than ask customers to click through a dashboard to pay a vendor or issue a card, Slash now lets Twin do it directly. In a Bloomberg interview the same day, Cardenas framed it as "displacing legacy banks with AI agents."

Key Details

• Round size & valuation: $100 million Series C at a $1.4 billion post-money valuation; total raised now >$160 million.
• Lead investors: Ribbit Capital (led), Khosla Ventures and Goodwater Capital (co-led), with NEA and Y Combinator participating.
• Revenue trajectory: Slash grew from $10 million to $250 million in annualized revenue over 24 months, per CEO Victor Cardenas.
• Payment volume: $30 billion in annualized payment volume across roughly 5,000 business customers. Card volume rose from ~$1 billion in 2024 to ~$3 billion in 2025.
• Stablecoin traction: Stablecoin payments crossed $1 billion annualized within nine months of launch.
• Twin AI agent: Executes payments, generates invoices, and spins up cards through contextual access to the customer's full Slash account.
• Customer base: Web3 startups, e-commerce operators, marketing agencies, HVAC contractors, healthcare suppliers, and online travel agencies.

What Developers and Users Are Saying

Early reaction from fintech-watching corners of X and LinkedIn has split along two lines. Bulls point to the revenue ramp — going from $10M to $250M ARR in 24 months is the kind of curve investors were last seeing in pure-AI companies, not banking platforms — and to Ribbit partner Micky Malka's quoted line that "the ratio of output to headcount is something we're only starting to see from the best AI-native companies."

Skeptics note that Slash is still a fraction of the size of incumbents Ramp (valued at roughly $32 billion) and Brex, and that entrusting an autonomous agent with the ability to move money is a larger leap than letting it summarize transactions. Twin's blast radius — a buggy action could send real dollars — will be scrutinized closely, especially given the regulatory scrutiny AI agents are attracting throughout 2026.

What This Means for Developers and Users

For startups and small businesses already on Slash, Twin is opt-in and gated behind the usual account permissions; there is no forced migration. For developers building on top of financial APIs, the launch is a clear signal that business banking is the next category where AI agents become table stakes rather than a feature differentiator. Expect Ramp, Brex, Mercury, and Relay to announce their own agent launches in the next two quarters, and expect underwriters to start asking harder questions about how agent-initiated transactions are authorized and audited.

What's Next

Slash says the Series C will fund Twin's rollout, deeper vertical tooling, and expansion beyond the U.S. The company has not committed to a firm international launch date. The release also notes new product investments in stablecoin infrastructure and multi-entity treasury — the two segments Slash views as most defensible against incumbents.

Sources

• Slash — Series C Fundraise Announcement — official company blog post with founder quotes and metrics
• Tech Funding News — Khosla Ventures lead and business-mix detail
• SiliconANGLE — Twin product framing and competitive context
• Fintech Global — investor syndicate breakdown
• Bloomberg — CEO interview on displacing legacy banks
• The Next Web — company background and pivot history