SubImage, a San Francisco, CA-based company that delivers an open-core cloud security graph for enterprises, has raised $4.2 million in Seed funding.
Investors
The round was from FundersClub, Y Combinator, Phosphor Capital, and Transpose Platform.
FundersClub is a pioneering, San Francisco-based online venture capital (VC) platform founded in 2012 that allows accredited investors to easily invest in pre-screened, early-stage technology startups.
Y Combinator (YC) is a technology startup accelerator and venture capital firm founded in March 2005. YC runs an intensive three-month program twice a year, providing accepted startups with $500,000 in standardized Seed funding along with hands-on mentorship to help them achieve product–market fit and rapid growth.
Phosphor Capital is a specialized, early-stage venture capital firm that focuses exclusively on investing in companies that have participated in the Y Combinator (YC) accelerator program. Since its launch, the firm has raised $34 million across two funds and has invested in over 200 YC companies.
Transpose Platform is a global formation-stage venture capital and asset management firm that specializes in providing first-check investments and strategic support to founders building category-defining platforms in high-growth sectors like AI, Web3, and Quantum Computing.
SubImage Use of Funds
The company will use the funding to grow its engineering team, expand customer pilots, and develop features that reduce the time required to fix security issues.
About SubImage
Founded by Alex Chantavy and Kunaal Sikka, SubImage delivers an open-core cloud security graph for enterprises, combining automation with context-aware insights. Built on the foundation of Cartography, SubImage helps organizations visualize infrastructure, correlate security events, prioritize vulnerabilities based on risk, and take actionable steps to remediate issues. Headquartered in San Francisco, California, SubImage maps a company's entire digital infrastructure, including cloud, SaaS, and on-premises assets, into a single, queryable graph.
Funding Details
Company: SubImage
Raised: $4.2M
Round: Seed
Funding Date: November 2025
Lead Investor: FundersClub
Additional Investors: Y Combinator, Phosphor Capital, Transpose Platform
Company Website: https://www.subimage.io/
Software Category: Cloud Security / Security Graph Platform
Source: https://www.globenewswire.com/news-release/2025/11/17/3189299/0/en/SubImage-Raises-4-2M-to-Map-the-Cloud-and-Secure-Everything.html