· Venture Capital Tracker · investment-strategies · 3 min read
Highstock’s $30M a16z Series A: $1B Listed, Sell-Through Dark
a16z led Highstock’s $30 million Series A on September 10, 2026. The NYC surplus-inventory marketplace now lists more than $1 billion of product — ten times the $100 million it confirmed at a $5.5 million Greylock seed. Valuation, GMV, and take rate were not disclosed.
VCT data record
Funding event facts
Source-backed financing and transaction details. Unknown terms remain undisclosed rather than estimated.
Highstock raises $30M Series A led by a16z
a16z led. Olivia Moore joining the board; Jeff Jordan advising. Valuation, GMV, and take rate not disclosed. Company/a16z claim $1B+ listed inventory.
- Event type
- Funding Round
- Event date
- Sep 10, 2026
- Stage / label
- Series A
- Amount
- $30M
- Confidence
- Company Disclosed
Company / target: Highstock
Lead: Andreessen Horowitz
Andreessen Horowitz led a $30 million Series A for New York’s Highstock on September 10, 2026. a16z AI partner Olivia Moore is joining the board; Jeff Jordan is an advisor (a16z, WWD). Valuation was not disclosed.
The number next to the check is more than $1 billion of inventory listed — ten times the $100 million Highstock confirmed at its $5.5 million Greylock seed on February 27, 2025 (Fortune). Listed is not sold. GMV, recovery rate, take rate, and ARR stay dark.
Key facts
| Field | Detail |
|---|---|
| Company | Highstock — private B2B surplus-inventory marketplace |
| Round | $30M Series A (Sep 10, 2026) |
| Lead | Andreessen Horowitz |
| Board / advisor | Olivia Moore (board); Jeff Jordan (advisor) |
| Prior | $5.5M seed, Feb 27, 2025 — Greylock lead; Max Mullen participated |
| HQ | 734 Broadway, New York; India office in Gurugram (site) |
| Valuation / GMV / take rate | Not disclosed |
Who uses it — and for what job
Sellers: brands that will not put leftover SKUs through TJX-style off-price. Beachhead is beauty. WWD named Laura Geller, Bliss, and Versed. a16z: 100+ major brands; ~60% of volume from companies with more than $500 million in annual revenue.
Buyers: 100+ wholesale accounts — live sellers and international e-commerce. WWD: international is 40% of the business; named live-commerce buyer The Boyzzz sells on Whatnot (~170,000 followers, 145,000+ sales). Fortune’s seed print: typical lot $20,000; Fragrance Depot (Canada) and allbeauty.com (U.K.). Ticket size was not restated.
Job: move short-dated lots without a public fire sale. Highstock matches, then runs logistics, compliance, payments, and paperwork. At seed, buyers bid and brands accept, reject, or counter — Highstock does not set the price (Fortune).
CEO Camille van Horne ran Instacart fulfillment as a Director of Product for six years. CTO Sean Cashin spent a decade on Instacart engineering (a16z). Fortune named Ashish Sinha cofounder and president at seed; the September a16z note names Camille and Sean.
What changed in 18 months
| Signal | Feb 2025 seed (Fortune) | Sep 2026 Series A |
|---|---|---|
| Listed inventory | $100M | $1B+ (a16z / company site) |
| Brands | 50 | 100+ “major” (a16z) |
| Large-brand mix | 30% of brands >$50M revenue | 60% of volume from >$500M revenue brands |
| Cross-border | 50% of transactions | 40% of business (WWD) |
| Landfill claim | not in Fortune | 10M+ pounds diverted (company site) |
Do not treat the mix rows as one growth series. Fortune measured share of brands; a16z measured share of volume, at a 10× higher revenue cutoff.
Van Horne told WWD beauty excess is a shelf-life problem — traditional retailers reject goods with less than 18 months of life — while apparel excess is seasonal and “five times the size of the beauty liquidation market.” Apparel is launching now. No apparel GMV was disclosed.
Why a16z — and what is not proven
a16z’s thesis: leftover lots are unstructured (no comps, a different buyer per batch), so the winner is AI-native and brand-safe. Moore puts the AI practice on a consumer-ops board. Jordan is the marketplace operator. Greylock seed partners: Mike Duboe and Christine Kim. a16z did not say Greylock or Mullen returned.
| Approach | Tradeoff |
|---|---|
| Off-price (TJX, Ross) | Clears volume; cheapens the brand in the home market |
| Brokers / jobbers | Relationship-driven; opaque recovery |
| Destruction | Protects brand; writes off cash |
| Highstock (claimed) | Private matching + ops; sell-through unproven in public |
| Whatnot / TikTok Live | Downstream demand, not a brand-side control layer |
Missing on a $30 million Series A: valuation, GMV, sell-through of the $1 billion list, take rate, current lot size, apparel volume, and the names behind the $500 million-revenue volume claim. WWD’s disclosed beauty logos are mid-tier, not conglomerates.
The thesis works if Highstock can clear apparel lots the way it listed beauty — and if recovery beats a quiet write-off. Until GMV or a recovery rate prints, $1 billion listed is a supply-side claim.
Related: Highstock profile · a16z · Greylock · NYC marketplaces · September 2026 hub.
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