Key Takeaways:

• Venture capital firm a16z led the $30 million Series A.
• Highstock tackles a trillion-dollar problem every brand faces: excess inventory.
• They have $1B+ in product listed from 100+ major brands, who use Highstock to reach vetted buyers.

Highstock, a B2B marketplace for surplus inventory, raised a $30 million Series A led by a16z.

WHO: Every brand inevitably makes more product than they can sell. Founder Camille van Horne, a former Instacart product leader, built Highstock after seeing warehouses full of sellable goods headed for destruction. The business-to-business marketplace helps beauty brands sell surplus inventory to vetted business buyers. Highstock works with a network of international buyers and live commerce players on channels like Whatnot and TikTok Live to help brands discreetly shift product out of their core markets to brand-additive channels.

WHY: Highstock will use the new funding to expand into apparel and fashion categories.

DETAILS:

• Highstock raised a $30 million Series A led by a16z with participation by Greylock. 
• Olivia Moore, AI partner at a16z, will join the board, and a16z investor Jeff Jordan will serve as an advisor.
• Highstock has listed more than $1 billion in inventory and works with over 100 major brands.
• Roughly 60% of transaction volume comes from brands and conglomerates with more than $500 million in annual revenue.
• International buyers, live sellers, and retailers account for 40% of the business. One Whatnot seller working with the platform,The Boyzzz, has nearly 170,000 followers and more than 145,000 sales.
• In 2025, Highstock raised a $5.5 million seed round.