Funding

California-Based Lightsage Raises $4M in Funding Round

Sep 9, 2026 | By Devin Jacobs

SUMMARY

Lightsage raised $4M led by Nexus Venture Partners.
The funding will support AI platform growth.
Lightsage helps software companies work with AI agents.

Lightsage, a San Francisco, CA-based provider of an Agent-Led Growth (ALG) platform, has raised $4 million in a funding round led by Nexus Venture Partners.

The round also saw participation from Steven Tamm, Abhinav Asthana, Matt Curl, Robert Chatwani, Hila, Zeno, Eric, Ivan, Shuhao, and Adam Frankl.

The company will use the capital to expand operations, strengthen its agent evaluation, analytics, attribution and optimization capabilities, and grow its technical and commercial teams.

Funding Snapshot

Metric	Details
Fundraise Amount	$4 million
Funding Round	Funding Round
Lead Investor	Nexus Venture Partners
Company	Lightsage
Sector	AI, Software & Agent-Led Growth
Headquarters	San Francisco, California, USA

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About Lightsage

Founded by CEO Jun Liang Lee and CTO Sean Er, Lightsage helps software companies understand how AI agents discover, evaluate and use their products. Its platform focuses on improving Agent Experience, helping products become easier for AI agents to understand, use and ultimately pay for.

Core offerings include:

Agent Discovery
Agent Experience evaluations
Agent Analytics
Agent optimization

Core Technologies / Products / Services

Capability/Product	Application/Use Case
Agent Discovery	Tracks how AI agents discover software products
Agent Experience	Evaluates APIs, SDKs, CLIs, MCP servers and agent skills
Agent Analytics	Shows agent traffic and points of failure
Agent simulations	Tests real-world agent workflows

Leadership Comments

“We are moving from an internet where AI tells people which software to use to one where AI increasingly uses the software itself,” said Jun Liang Lee, CEO and Co-Founder of Lightsage. “That changes what growth means. Visibility still matters, but the real test is whether an agent can understand your product and get to a successful outcome.

“The internet brought the economy online, with humans discovering, choosing and transacting through digital channels. That created an enormous marketing technology industry focused on understanding and optimizing the human journey,” said Abhishek Sharma, partner at Nexus. “AI is now shifting that agency from humans to agents, which can discover, evaluate and act on a customer’s behalf.