Private Marketplace (PMP) Deals: What They Are and When to Use Them
If you've been running campaigns through an RTB platform, you already understand how the open exchange works: thousands of buyers compete for impressions in real time, prices are driven by auction dynamics, and the result is efficient but unpredictable. Private Marketplace deals — commonly called PMPs — offer a different model. They give advertisers priority access to specific inventory, and they give publishers more control over who runs ads on their sites. In this post, we'll break down exactly what PMPs are, how they compare to the open exchange, and how to decide whether a PMP deal fits your strategy.
What Is a Private Marketplace (PMP)?
A Private Marketplace is an invitation-only RTB auction. Instead of competing against every buyer on the open exchange, a publisher invites a select group of advertisers — or even just one — to bid on their inventory before it becomes available to the wider market.
Think of it like this: the open exchange is a public auction where anyone can bid. A PMP is a private viewing the night before, where only a few vetted buyers get first pick.
PMPs run on the same real-time bidding infrastructure you already use, but with a key addition: a deal ID — a unique identifier that connects a specific buyer to a specific block of inventory at agreed-upon terms. When your system encounters inventory tied to your deal ID, it gets first access before the general auction begins.
How PMP Deals Work
Here's the basic flow of a PMP transaction:
- The publisher identifies premium inventory — high-traffic pages, specific ad placements, or audience segments they want to package and offer at a premium.
- The publisher sets a floor price — a minimum CPM they'll accept for that inventory. (For more on this, see our post on Publisher Floor Prices.)
- The publisher shares a deal ID with selected advertisers — this ID is entered into the advertiser's buying platform or campaign settings.
- The advertiser bids using the deal ID — their bids receive priority access to that inventory before it enters the open auction.
- The impression is won or passed — if the advertiser's bid meets or exceeds the floor, they win it. If not, the impression falls back to the open exchange.
The key distinction from a traditional direct buy: PMP deals still use RTB infrastructure, so buying remains automated and data-driven. You're not signing an insertion order for a fixed number of impressions — you're getting preferential access within an auction framework.
PMP vs. Open Exchange: Key Differences
| Factor | Open Exchange | Private Marketplace | |---|---|---| | Access | Open to all buyers | Invite-only | | Inventory quality | Variable | Typically premium | | Pricing | Set entirely by auction | Floor price agreed in advance | | Publisher transparency | Often obscured | Usually disclosed | | Scale | Very high | More limited | | Brand safety | Less controlled | Greater control |
Neither model is universally better — each serves a different purpose depending on your goals and the quality of inventory you need.
When Should Advertisers Use a PMP?
PMPs tend to make sense in several specific situations:
You need premium, brand-safe placements. If you're running campaigns for a mainstream brand and need to avoid low-quality or risky sites, PMPs give you direct access to publishers whose content and audience you've vetted in advance.
You want greater transparency. In the open exchange, the exact source of an impression is often obscured. PMPs typically identify the publisher clearly, so you know exactly where your ads are appearing — and can optimize with confidence.
You're targeting a specific audience segment. Some publishers with strong first-party data — email lists, logged-in user bases, niche communities — offer PMP deals tied to those audiences. This can be far more precise than relying on open-exchange signals alone. Pairing a PMP with solid audience segmentation can significantly sharpen your targeting.
You're experiencing inconsistent delivery at scale. If you're spending significant budget and finding that open-exchange inventory is unpredictable, a PMP with a defined floor and preferred access gives you more reliable delivery.
When Should Publishers Offer PMP Deals?
For publishers, PMPs are a way to generate higher CPMs from your best inventory without giving up the flexibility of programmatic selling.
Package your highest-performing placements. If certain ad units or pages consistently attract strong open-exchange bids, those are the right candidates for PMP deals. Buyers will pay a premium for priority access to inventory they know performs well.
Use PMPs to build direct advertiser relationships. A PMP deal is often the first step toward an ongoing relationship with a buyer — without the overhead of fully managed direct campaigns. It's programmatic efficiency with a more personal touch.
Set realistic floor prices. A floor that's too high means inventory passes back to the open exchange, which defeats the purpose. Review your average open-exchange CPMs and set your PMP floor at a modest, defensible premium above that baseline. If you need a refresher on how floors work, see our guide on publisher floor prices.
Understanding Deal IDs
Every PMP deal is tied to a deal ID — a string of characters that links a buyer to a specific inventory package. When you're setting up a PMP on the buy side, you'll enter this deal ID into your campaign targeting. It signals to the bidding system: "When this inventory becomes available, I get priority."
If you're new to deal IDs, think of them as a VIP pass. When your system sees an impression attached to your deal ID, it bids first — before the general public gets a shot.
On the publisher side, generating a deal ID is typically done inside your supply-side platform (SSP) or directly through your ad network. If you're a Squren publisher, our support team can walk you through how to structure a private deal with interested buyers.
PMP vs. Direct Buys: Where PMPs Fit
It's worth placing PMPs in the broader context of how inventory gets bought and sold:
- Open exchange — fully automated, widest competition, lowest average CPMs
- Private Marketplace — preferred access, agreed floor, still auction-based
- Programmatic Guaranteed — fixed price, guaranteed volume, fully automated delivery
- Direct buy — negotiated manually, typically the highest CPMs, the least automation
PMPs occupy a sweet spot: more control than the open exchange, more flexibility than a direct buy. For many advertisers and publishers, they represent the right balance between efficiency and quality.
Conclusion
Private Marketplace deals are a powerful middle ground between the open exchange and fully managed direct buys. For advertisers, they unlock access to higher-quality inventory with greater transparency and predictability. For publishers, they're a tool for commanding premium CPMs on your best placements while keeping the speed and efficiency of programmatic infrastructure.
Whether you're buying or selling, understanding how PMPs work gives you more options — and more leverage — in any programmatic environment.
Ready to put these strategies into practice? Sign up as an advertiser at Squren.com to access our RTB platform and start reaching the audiences that matter most to your campaigns. Or join Squren as a publisher and start monetizing your traffic with the tools, reporting, and support you need to grow. Our 24/7 team is always available to help you find the right approach for your goals.
