Kastle Raises $24M Series A Led by Insight Partners to Build the AI Workforce for Banking Operations

The new funding positions Kastle to help enterprises deploy reliable AI across existing infrastructure, giving banks and lenders a faster, safer path to realizing the full value of AI without replacing critical core systems

SAN FRANCISCO, Sept. 17, 2026 /PRNewswire/ -- Kastle, the AI workforce platform transforming consumer lending, today announced it has raised $24 million in Series A funding. The round was led by Insight Partners, with continued participation from existing investors Y Combinator and Commerce Ventures. Fifth Wall and a group of prominent founders and financial services executives also joined the round as new investors.

Kastle is building the AI workforce for financial services, beginning with consumer lending – an industry where enormous volumes of essential work still move through legacy systems, manual processes, and operational teams. The company is already powering work across some of the largest enterprises and banks in the world. Its AI agents have processed more than $1.8 billion in transactions, establishing Kastle as an emerging category leader in consumer lending and demonstrating that enterprise AI can perform consequential work at scale.

AI has given financial institutions a historic opportunity to transform how that work gets done. But for most large enterprises, the path to adoption is logistically challenging. Replacing legacy infrastructure with an entirely AI-native technology stack could require years of complex, high-risk migration, in a world where technology shifts happen every other quarter, and layering conventional AI assistants onto existing systems captures only a fraction of AI's potential. The result is a growing adoption gap: institutions recognize what AI can do but remain constrained by the systems and operating models they already have.

Kastle offers another path.

Its platform enables financial institutions to deploy specialized AI agents that work across their existing core systems, execute high-volume workflows, and keep systems of record current. Rather than requiring a full infrastructure overhaul, Kastle turns that infrastructure into an environment where AI agents and people can work together.

This creates a new operating model for financial services: hybrid teams in which AI agents handle high-volume, repeatable work, while people focus on complex cases requiring judgment, expertise, empathy, and relationships. Kastle's agents complete work inside the institution's existing processes and controls, giving organizations additional capacity while helping their teams maintain consistency, oversight, and compliance.

"For years, enterprises have effectively been presented with a false choice: accept the limitations of legacy operations or endure a long and risky replacement of the systems at the heart of their business," said Rishi Choudhary, Co-Founder and CEO of Kastle. "Kastle creates a third path. We give financial institutions an AI workforce that can operate across the systems they already have, so they can capture the benefits of AI now—not five years from now. We believe this will become the safest and fastest way for the world's largest institutions to become AI-native."

Kastle's initial focus is consumer lending, where institutions must coordinate high volumes of time-sensitive work across fragmented technology environments while meeting exacting service, risk, and regulatory requirements. Its AI agents are purpose-built for these workflows, combining financial services context with the ability to take action across the tools institutions use today.

"Financial institutions do not need another layer of software that creates more work for their teams. They need AI that can reliably complete the work while ensuring compliance," said Rebecca Liu-Doyle, Managing Director at Insight Partners. "Kastle deploys AI agents that can navigate complexity, pass the bar on regulatory rigor, and get high-stakes work done without waiting for a multiyear transformation. We're thrilled to partner with the Kastle team as they continue to reshape this category."                     

The funding comes as financial institutions move beyond isolated AI experiments and begin searching for a practical path to enterprise-wide adoption. Kastle will use the capital to expand its engineering, product, and go-to-market teams; deepen the capabilities of its platform; and accelerate deployments with leading banks and other financial institutions across North America.

"Software gave every employee more tools. AI will give every enterprise more capacity," Choudhary added. "The winning institutions will be built around hybrid teams that combine the scale and consistency of AI agents with the judgment and relationships of exceptional people. Kastle is building the platform that makes that future possible."

About Kastle

Kastle is building the AI workforce for financial services. Its platform enables financial institutions to deploy specialized AI agents that execute high-volume work across existing systems, allowing enterprises to realize the benefits of AI without replacing their core infrastructure. Beginning with consumer lending, Kastle helps institutions create hybrid teams in which AI agents provide scale and consistency while people focus on work requiring judgment, expertise, and relationships.

Kastle powers work across some of the largest enterprises and banks in the world and has processed more than $2 billion in transactions. The company is backed by Insight Partners, Y Combinator, Commerce Ventures, Fifth Wall, and leading founders and financial services executives.

To learn more, visit www.kastle.ai.

About Insight Partners

Insight Partners is a global software investor partnering with high-growth technology, software, and Internet startup and ScaleUp companies that are driving transformative change in their industries. As of December 31, 2025, the firm has over $90B in regulatory assets under management. Insight Partners has invested in more than 900 companies worldwide and has seen over 55 portfolio companies achieve an IPO. Headquartered in New York City, Insight has a global presence with leadership in London, Tel Aviv, and the Bay Area. Insight's mission is to find, fund, and work successfully with visionary executives, providing them with tailored, hands-on software expertise along their growth journey, from their first investment to IPO. For more information on Insight and all its investments, visit insightpartners.com or follow us on X @insightpartners.

SOURCE Kastle