CoreStack

Overview

CoreStack is a Bellevue, Washington–based enterprise software company that sells an AI-powered cloud-governance platform spanning CNAPP (cloud-native application protection), SecOps, FinOps, and CloudOps — in practice, software that helps large companies control the cost, security, and regulatory compliance of their cloud infrastructure across multiple providers (Pulse2). The company was founded in 2016, with Ezhilarasan Natarajan as founder and CEO, and operates with engineering and business operations in India alongside its Bellevue headquarters (Inc42; Pulse2).

Unlike most of its press coverage — which consists of company-issued funding announcements — this profile is built entirely from what independent outlets reported: a verifiable funding history from seed through Series B, a 2025 growth financing, and the metrics the company put on the record with independent reporters.

Funding history: seed to Series B

CoreStack’s Indian entity is registered as CoreStack India Private Limited, and the company’s founding year is independently given as 2016 (Inc42). Its equity funding record, tracked round by round by Inc42, runs: a $3.21 million seed round led by Z5 Capital in October 2018; an $8.5 million Series A led by Dallas Venture Capital in March 2020; a $4 million round involving Iron Pillar in December 2020; and a $30 million Series B led by Avatar Growth Capital in November 2021 — for a total of $45.71 million across four rounds (Inc42).

The Series B was covered by India’s Business Standard, which reported that the round brought total funding to $45 million following the March 2020 Series A, with Dallas Venture Capital, Iron Pillar, and angel investors continuing alongside Avatar (Business Standard). At that point the company said it was governing more than $1 billion in combined cloud consumption for over 100 enterprise customers across financial services, healthcare, and retail, and described partnerships with Amazon Web Services, Microsoft Azure, and Google Cloud (Business Standard).

From cloud infrastructure to autonomous governance

CoreStack began focused on simplifying cloud infrastructure for businesses and broadened over time into full multi-cloud governance (Inc42). By the time of the Post Road financing, the company described its offering in “agentic” terms: AI capabilities that continuously enforce governance intent across cloud, SaaS, and security operations rather than merely reporting on violations (Pulse2). The financing was explicitly framed around growth into the public sector as well — the company cited new enterprise and government customers that had increased average deal sizes and expansion revenue, and Post Road’s Gardner Horan praised the platform’s combination of multi-cloud governance, security, and financial-operations automation as “critical to digital transformation” (Pulse2). Founder and CEO Ezhilarasan Natarajan said the financing reinforced “the strength of CoreStack’s business fundamentals, market momentum, and AI-driven product vision” (Pulse2).

The Post Road financing and the agentic-governance pitch

In October 2025, CoreStack secured a $50 million growth financing led by Post Road Group, an alternative investment firm — structured as funded debt rather than equity, designed to optimize the company’s capital structure while funding product innovation, market expansion, and M&A without diluting ownership (Pulse2). Reporting at the time put the company’s customer base at more than 780 organizations globally, with year-over-year ARR growth above 30% and “billions of dollars” in managed cloud spend; the platform enforces compliance against more than 2,000 industry standards across AWS, Azure, Google Cloud, Oracle, and hybrid, edge, and private clouds (Pulse2).

The financing announcement marked a product repositioning as well: CoreStack described new “agentic AI” capabilities in its FinOps+ product and a CNAPP product called Graphion, and cited client outcomes including up to 40% reductions in cloud waste, 50% improvements in compliance posture, and thousands of blocked potential cybersecurity threats (Pulse2). The company said the capital would go toward R&D, global go-to-market efforts, hiring, and acquisitions, positioning CoreStack as an AI-powered governance and security platform for enterprises and public institutions (Pulse2).

What this profile does not claim

• The names of CoreStack’s co-founders beyond Natarajan, and claims about Gartner, Forrester, or IDC recognitions, appear in company-issued materials that this profile did not use; they are not repeated here because no independent source read in full confirmed them.
• In March 2026 the company announced an acquisition of BetterCloud, the SaaS-management platform, but the announcement exists only in company-issued releases — no independent coverage was found in this research pass — so this profile does not describe the transaction’s terms or confirm its completion.
• Inc42’s revenue figure (₹49.2 crore for FY25) covers the Indian entity only; global company revenue was not independently verified.
• The GeekWire article on the Series B (a solid tier2 source) could not be fetched due to upstream rate limiting; Business Standard was used instead, and both outlets’ round figures agree.