Why B2B marketplaces still win in fragmented supply chains

Our thesis for trust-first marketplace ventures.
Consumer marketplaces are largely settled. B2B marketplaces in fragmented physical supply chains are not, and the reason is that the hard problem was never matching buyers to sellers. It was trust — and trust is a product feature that takes years to build and cannot be copied by a better search algorithm.
Fragmentation is the moat, not the obstacle
In construction materials, industrial parts, and specialty chemicals, the top ten suppliers frequently hold under a quarter of the market. That is miserable for a software vendor selling seats and excellent for a marketplace, because no single participant has the leverage to build the network themselves.
"In fragmented markets the marketplace is not disintermediating anyone. It is building infrastructure nobody had the incentive to build alone."
Trust is the product
The transactions that move to a B2B marketplace first are the ones where verification is expensive: is this stock real, will it arrive, will the invoice be honoured. Ventures that solve verification — inspection, escrow, guaranteed delivery windows — take the transaction. Ventures that only solve discovery get used as a catalogue and disintermediated on the second order.
What we build against
Our test for a marketplace thesis is whether we can own a verification step within ninety days. Buildstock passed because verified stock levels and a next-day delivery guarantee were things we could stand behind ourselves, with our own capital, before any network existed. That is what we look for.