Marathon Management Partners
Overview
Venture capital firm investing in category-defining founders.
Founded
2025
Deals · 12mo
3
Links
Stage focus
Geographic focus
Sector focus
Investment portfolio
- Straiker
Led · Series A · Jun 2026
Straiker provides an agentic-native security platform with three integrated capabilities: comprehensive discovery of AI agents across enterprise environments, pre-deployment adversarial testing to surface vulnerabilities, and runtime protection that monitors activity and stops threats. The founding team includes veterans of Palo Alto Networks and AI/security research, and the company emphasizes a shared intelligence layer that uses production detections to strengthen testing and protections. Since launching in 2025, Straiker has become a partner to frontier AI labs and Fortune 500 enterprises and reports run-rate revenue growth of more than 15x in less than a year. Straiker operates STAR Labs, its dedicated AI threat research arm, which informs its defenses and provides early visibility into emerging attack techniques.
- Atlas Card
Participated · Series C · Apr 2026
Atlas operates a members-only concierge service and charge card that aims to deliver access to coveted experiences alongside a seamless spending experience. The company announced a $40 million Series C at a $420 million valuation in April 2026. Investors in the round included lead backers Elad Gil and Verified Capital, as well as 01 Advisors, Marathon Management Partners, and others. Legal counsel on the transaction was Wilson Sonsini Goodrich & Rosati, which advised Atlas through a team led by Rob Broderick. The public reporting does not disclose revenue, user counts, or specific go-to-market metrics. The company also did not disclose detailed plans for the proceeds in the coverage.
- uiAgent
Led · Seed · Sep 2025
uiAgent provides an enterprise-grade AI agent platform purpose-built for accounting firms, supporting both on-premise and cloud deployments. Its library of pre-built agents automates critical workflows across Audit, Client Accounting Services, and Tax, delivering outcomes such as an 80% reduction in manual data entry, a 25% faster monthly close, a 35% quicker Employee Benefit Plan audit, and full automation of journal entry creation. The platform’s differentiator is the ability for firms to customize agents to fit complex client needs, avoiding the rigidity of many competing systems. uiAgent is already used by numerous U.S. Top-100 accounting firms and has reached seven-figure annual recurring revenue in under a year. By removing repetitive tasks, the company addresses the CPA industry’s labor shortage while improving client satisfaction and deliverable quality. Headquartered in New York, uiAgent plans to use new capital to accelerate agent development and expand deployments across additional large enterprises.
- Niural
Led · Series A · Jun 2025
Niural provides an AI-native platform that automates global payroll, benefits, payments, and compliance, serving businesses in more than 150 countries. The company operates regulated financial and compliance infrastructure, including proprietary tax engines and regulated money movement capabilities, and runs payroll and payments globally. Since launching a master medical partnership with Aetna in April 2026, Niural said it crossed $200 million in annualized gross revenue on its PEO product and moves billions of dollars in global transaction volume for customers such as Rillet, Sevaro, ConductorOne, and Polygon. Institutional partnerships include Aetna, Guardian, and Kaiser. Niural also built EMMA, an executional AI coworker, and has launched Niural AI Labs to develop long-horizon, production-grade agents for high-stakes work. The company intends for research and breakthroughs from the Lab to feed back into its product to increase automation, reduce manual handoffs, and strengthen compliance.