Spend enough time in CTV, and you hear the same talking points over and over: direct supply is good, resold supply is bad, and the industry just needs a cleaner supply chain. It sounds straightforward, but it doesn’t reflect how CTV actually works in practice.
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A lot of publishers do not rely solely on the inventory tied directly to their own channels. Beyond the biggest platforms, owned-and-operated inventory alone usually does not provide enough scale to drive steady demand. Streaming services require specific distribution models, while buyers prioritize scale, efficiency, and audience reach.
As a result, publishers depend on a mix of partnerships, intermediaries, and deal structures to maximize revenue, which naturally creates a more layered supply chain. That complexity is part of the system and does not mean the system has broken down. So what does that look like in reality? Let’s take a closer look at it.
Understanding the Main CTV Inventory Models
Publishers generally package their inventory in a few established ways. In practice, five common models define how CTV supply reaches buyers, and most publishers rely on a combination of them rather than a single approach.
Inventory Share
The publisher and platform divide the inventory within a publisher’s channel, with each side responsible for monetizing its own share. This setup forms the basis of many distribution agreements because it gives publishers a direct role in selling inventory while also allowing the platform to participate. For independent publishers, inventory sharing is often part of the cost of gaining distribution.
Backfill
Publishers and platforms support each other by filling unsold inventory. If the platform cannot monetize an impression, the publisher can serve demand against it, and vice versa. The arrangement improves yield while keeping ownership and core relationships unchanged.
Buyback
The publisher purchases inventory from the platform within its own channel and resells it through its own demand relationships. This gives the publisher more influence over pricing and demand consolidation and lets the publisher regain access to inventory that would otherwise get monetized externally. Buybacks are especially common in revenue- or inventory-share agreements, where they are among the few ways publishers can scale the monetization of their own inventory.
Audience Extension
Instead of limiting campaigns to its own channel, the publisher purchases impressions tied to its audience across the wider platform. Those impressions are then packaged and sold to buyers. This allows publishers to expand beyond the limits of their owned inventory and offer audience scale rather than just channel scale.
Run-of-Network
In this setup, the publisher accesses inventory across the broader platform, outside of its own content and audience. The focus is on volume, typically with lower margins, to help satisfy buyer demand and increase revenue. While less common than the other models, it still plays a role in some publisher strategies.
Using several of these approaches at once is standard practice for publishers. It allows them to grow from relatively small impression counts to much larger volumes within the same platform ecosystem. It also helps them maintain distribution relationships, improve negotiating leverage with platforms, and meet buyer expectations around scale. The challenge is that the market often misunderstands this reality and does not clearly reflect it in the bidstream.
The Problem With How CTV Supply Paths Are Classified
From the buyer’s side, many of these supply arrangements end up grouped under the same label. A publisher extending campaigns against its own audience can appear no different from a third-party reseller moving generic inventory. Buyers may view a publisher buying back inventory from its own channel the same way they view an intermediary adding another layer for margin.
This creates a disconnect between how the ecosystem operates and how buyers evaluate supply. Buyers often say they want transparency, stronger publisher relationships, and more reliable supply paths. But when there is no clear way to separate one structure from another, those priorities become difficult to apply in practice. Supply starts to blend, and buying decisions fall back on scale, pricing, and whichever signals are easiest to measure.
Publishers feel the effects directly when the market fails to represent these relationships properly and instead undervalues their inventory. That can lead to lower fill rates, reduced CPMs, and inconsistent demand. Publishers may be doing the work to expand and organize supply, usually centered around their own inventory, yet the market still categorizes it as indirect and assigns it less value. This is ultimately a representation issue.
If the industry wants a more informed discussion about supply paths, it needs more precise ways to describe them. That does not mean rebuilding the ecosystem from scratch. It could be as simple as extending frameworks like ads.txt or sellers.json to give buyers clearer visibility into how inventory is sourced and structured. With better representation, buyers can make decisions that align with the supply paths they claim to support, and publishers can operate with clearer market signals.
CTV is not becoming less complex but evolves through a network of structured relationships that the industry must understand for what they are. These five models are one way to frame that structure. The next step is making sure the market can recognize it.
A More Accurate View of CTV Supply
The conversation around CTV supply chains often treats complexity as a problem to eliminate. In reality, complexity is a byproduct of how the market functions. Publishers are balancing distribution requirements, buyer expectations, and monetization goals across fragmented platforms and evolving demand channels. The result is not a broken ecosystem, but one built on layered commercial relationships that serve different purposes.
The issue is not that these structures exist, but that the market lacks consistent methods for identifying and evaluating them. When the market groups different supply models under broad labels, buyers lose visibility into what they are actually purchasing, and publishers lose credit for the value they create.
A more transparent framework would not simplify CTV overnight, nor should it. But a clearer representation would make the ecosystem easier to evaluate on its own terms. As CTV continues to mature, understanding how supply is structured will become increasingly important for both buyers and publishers.
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