Highstock Raises $30M Series A Led by Andreessen Horowitz for AI B2B Surplus Inventory Marketplace

Highstock Closes $30M Series A

Highstock, a New York-based operator of an AI-powered B2B marketplace for surplus and short-dated consumer inventory, has raised a $30 million Series A round. The round was led by Andreessen Horowitz, with participation from Greylock Partners, Daybreak Ventures, and Abstract Ventures. The funding was announced on September 10, 2026.

What Highstock Does

Highstock runs an AI-powered B2B marketplace where consumer brands sell surplus and short-dated inventory to a vetted network of global wholesale buyers. That buyer network includes retailers and live-commerce sellers operating on channels such as Whatnot and TikTok Live.

The company handles matching, logistics, compliance, and payments, allowing brands to clear excess stock discreetly without the fire-sale optics that typically accompany liquidation. By managing the transaction end to end, Highstock positions itself as infrastructure for brands that need to move inventory without damaging their pricing or brand perception in primary retail channels.

Traction and Scale

Highstock lists more than $1 billion in inventory from over 100 major brands. Its beachhead is beauty and personal care, and the company has begun expanding into apparel and fashion.

The combination of a large listed inventory base and a vetted global buyer network suggests Highstock has moved beyond a pure matching layer into operational territory — logistics, compliance, and payments are all handled on-platform, which increases switching costs for both sides of the marketplace.

Founding Team

Highstock was founded by Camille van Horne, a former Instacart product director, and CTO Sean Cashin. Van Horne's background in product at a high-volume marketplace business is directly relevant to Highstock's core challenge: matching fragmented, time-sensitive supply with a distributed buyer base. Cashin leads the technical organization behind the AI matching and operational layer.

Why This Round Matters

The Series A brings Highstock's total disclosed funding to a level that supports expansion beyond its beauty and personal care base. The investor syndicate is notable: Andreessen Horowitz led the round, with Greylock Partners, Daybreak Ventures, and Abstract Ventures participating. That mix of large generalist capital and smaller specialist funds typically signals confidence in both the market opportunity and the company's execution to date.

Market Context

Surplus and short-dated inventory is a persistent problem for consumer brands. Traditional liquidation channels are opaque and often visible to consumers, which creates pricing pressure on primary channels. Highstock's approach — a vetted wholesale network combined with managed logistics, compliance, and payments — targets that specific pain point.

The live-commerce angle is also worth noting. Buyers on Whatnot and TikTok Live operate in a fast-moving, high-volume environment where access to branded surplus inventory at wholesale prices is a direct input to their economics. Highstock sits between those buyers and the brands holding excess stock.

What to Watch

• Expansion from beauty and personal care into apparel and fashion, which the company has already begun.
• Growth of the listed inventory base beyond the current $1 billion and 100-plus brand relationships.
• Whether the managed logistics, compliance, and payments layer becomes a durable moat as the marketplace scales.

Summary

Highstock has raised a $30 million Series A led by Andreessen Horowitz, with Greylock Partners, Daybreak Ventures, and Abstract Ventures participating. The New York company operates an AI-powered B2B marketplace for surplus and short-dated consumer inventory, listing more than $1 billion in inventory from over 100 major brands, with a beachhead in beauty and personal care and expansion underway into apparel and fashion.