Private Marketplace (PMP)

A private marketplace (PMP) is an invite-only programmatic auction in which a publisher (or group of publishers) offers premium ad inventory to a curated set of buyers, accessed through a unique deal ID. It is still an auction, but a closed one, contrasted with the open exchange that anyone can bid into.

How it works#

A publisher packages specific inventory, say, homepage placements or a high-value content section, and issues a deal ID to approved buyers. The buyer enters that deal ID into their DSP and bids on the reserved inventory, often above a negotiated floor price. PMP deals typically get priority over open-auction demand, so buyers see cleaner supply and publishers protect their premium inventory and pricing. It runs over the same ad exchange infrastructure as the open market, just gated by invitation.

Why it matters#

PMPs occupy a middle ground in the spectrum of deal types. They sit between the wide-open exchange and fully reserved programmatic direct deals: more control, transparency, and quality than the open auction, but more flexibility than a guaranteed buy. Buyers use them for brand-safe environments and access to inventory that never reaches the open market, while keeping the targeting and reporting benefits of programmatic advertising.

Related terms: Programmatic Direct, Ad Exchange, and Programmatic Advertising.