Highstock Raises $30 Million to Scale a Marketplace for Excess Inventory

Highstock, a New York-based B2B marketplace that helps consumer brands sell excess inventory to vetted wholesale buyers, has raised a $30 million Series A led by Andreessen Horowitz, with participation from Greylock Partners, Abstract, Daybreak Ventures, and several angel investors. The round closed September 10.

Founded by CEO Camille van Horne and CTO Sean Cashin, both former Instacart executives, Highstock has been operating for just over a year and already lists more than $1 billion of inventory on its platform, working with more than 100 major consumer brands. Roughly 60% of transaction volume comes from brands generating more than $500 million in annual revenue, a sign the platform has found real traction with large, established consumer companies rather than only smaller sellers.

A liquidation channel that avoids liquidation's downsides

Traditional liquidation channels for excess inventory typically sell at steep discounts to unvetted buyers, a process that can damage brand positioning and flood secondary markets with product at prices that undercut a brand's own retail channels. Highstock's pitch is a vetted wholesale buyer network instead, letting brands recover more value per unit while keeping tighter control over where their excess product ends up. The company also frames the platform as an environmental story: more than 10 million pounds of product have been kept out of landfills through the marketplace so far.

A marketplace, not a straight liquidator

The distinction between a marketplace and a liquidation channel matters more than it might first appear. A liquidator typically buys inventory outright at a steep discount and resells it with no ongoing relationship to the original brand, while Highstock's marketplace model keeps brands in control of pricing and buyer vetting throughout the transaction. That structural choice is likely a meaningful part of why 60% of transaction volume comes from large, brand-conscious companies rather than smaller sellers with less to protect: a $500 million-revenue consumer brand has much more at stake in where its excess product ends up than a smaller company would.

What this means for founders

Highstock's traction numbers, more than $1 billion in listed inventory and 100-plus brand partners within roughly a year, are a useful benchmark for what a genuinely fast-scaling B2B marketplace can look like when it solves a real, previously poorly-served pain point. The founders' operating background at Instacart, a company that itself had to solve complex supply chain and inventory logistics at scale, is a specific credibility signal worth noting: investors backing marketplace founders increasingly weight direct operating experience in adjacent supply chain problems as heavily as prior startup experience generally.

B2B marketplace and supply chain investors can be filtered on the investor directory, and the free investor matching toolscores fit against marketplace-specific metrics. Background on how Series A rounds get priced is in the glossary entry on seed round financing progression. Currently live raises are visible on the live listings page, and broader marketplace funding activity is tracked on the newsroom.

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