The world of Connected TV (CTV) advertising is evolving rapidly, and media buyers who understand the nuances of app choice sets and aggregator dynamics are consistently outperforming their competitors. Whether you’re managing campaigns for a Fortune 500 brand or a growing DTC company, understanding how CTV aggregators influence CPM pricing is no longer optional — it’s essential. In this comprehensive guide, we’ll break down exactly how aggregator platforms shape the cost-per-thousand-impressions (CPM) landscape, what that means for your media buying strategy, and five proven ways these intermediaries directly impact what you pay — and what you get — in the connected TV ecosystem.
What Are CTV App Choice Sets?
Before diving into CPM impacts, it’s important to understand what app choice sets actually mean in the context of connected TV advertising. An app choice set refers to the collection of individual streaming applications — such as Peacock, Pluto TV, Tubi, Sling, or Paramount+ — that an advertiser or media buyer selects (or is presented with) when targeting audiences across CTV platforms.
These sets can be curated by the advertiser directly, recommended by a demand-side platform (DSP), or assembled by an aggregator that packages multiple apps into a single buying unit. The composition of your app choice set has a profound impact on campaign performance, reach, and most critically, your CPM costs.
App choice sets are not static. They shift based on content licensing cycles, platform deals, seasonal inventory availability, and the competitive landscape of programmatic auctions. Understanding these dynamics helps media buyers make smarter, more cost-efficient decisions.
The Difference Between Curated and Aggregated App Sets
There’s an important distinction to understand here:
- Curated app sets are hand-picked by a media buyer or brand, often based on specific audience alignment, content adjacency, or brand safety requirements.
- Aggregated app sets are assembled by intermediaries — aggregator platforms — that package multiple CTV apps under a single deal or buying unit, often with negotiated rates and access guarantees.
Both approaches have merit, but the aggregated model introduces specific economic forces that directly influence what media buyers end up paying in CPM. Let’s explore that in depth.
Understanding CTV Aggregators and Their Role in Media Buying
CTV aggregators are platforms or companies that consolidate inventory from multiple streaming apps and publishers, then offer that bundled inventory to advertisers through a single buying interface. Examples of aggregators in the CTV space include platforms like Xandr (now part of Microsoft), Magnite, FreeWheel, SpotX, and various smart TV OS-level aggregators like Samsung Ads and LG Ads Solutions.
These companies act as intermediaries between the streaming apps (supply side) and the advertisers (demand side). By aggregating inventory across dozens or even hundreds of apps, they provide scale, simplify buying workflows, and often offer enhanced audience targeting capabilities that individual apps may not be able to provide on their own.
However, aggregators are not neutral parties. They have business models, margin structures, and contractual relationships that can significantly influence the CPM you pay. Understanding their incentives is a critical skill for any modern CTV media buyer.
Why Aggregators Matter for CPM Optimization
CPM in the CTV ecosystem doesn’t exist in a vacuum. It’s shaped by:
- The supply of available impressions across selected apps
- The demand from competing advertisers bidding in programmatic auctions
- The data and targeting signals attached to each impression
- The contractual terms negotiated by aggregators on both sides of the transaction
- The technological infrastructure through which impressions are transacted
Each of these factors is directly influenced by how aggregators operate. Now, let’s explore the five proven ways they impact your CPM.
Way #1: Inventory Bundling and Its Effect on CPM Floors
One of the most direct ways aggregators impact CPM is through inventory bundling. When an aggregator packages inventory from multiple CTV apps into a single buying unit, they often establish a blended CPM floor — a minimum price that applies to the entire bundle rather than individual apps.
This bundling strategy can work both for and against media buyers, depending on the situation.
When Bundling Increases CPM
In many cases, aggregators bundle premium inventory (high-demand apps with large, engaged audiences) together with mid-tier or lower-demand inventory. The bundled CPM reflects an average that’s often higher than what you’d pay if you could selectively buy only the lower-tier apps. This “forced averaging” can inflate your effective CPM. – Zip Code Level Targeting: 5 Proven CTV Wins
- Premium apps like Peacock or Paramount+ may individually command CPMs of $30–$50+
- Long-tail AVOD apps may have floor CPMs of $8–$15
- A bundled package might price at $22–$28 CPM across the combined inventory
- For buyers seeking efficient reach, this blended rate may not represent the best value
When Bundling Reduces CPM
On the flip side, if an aggregator has negotiated volume-based pricing with premium publishers, the bundled CPM might actually be lower than what you’d pay buying those premium apps directly. This is a key advantage of working with established aggregators who have strong supply-side relationships.
Smart media buyers evaluate bundled offers carefully, modeling out whether the blended CPM provides better reach efficiency than a la carte buying across individually selected apps in their choice set.
Way #2: Audience Data Layering Drives CTV CPM Premiums
One of the biggest CPM drivers in the CTV advertising ecosystem is audience data. Aggregators with robust first-party data or deep data partnerships can layer rich audience signals onto impressions — and that data adds significant cost.
When you’re buying through an aggregator that offers advanced audience targeting (such as behavioral, purchase intent, or deterministic household matching), you’re paying a premium for that precision. This is entirely reasonable if the targeting genuinely improves campaign performance, but it can silently inflate your CPM if you’re not actively managing your data selections.
Types of Data Layers That Impact CTV CPM
- Third-party demographic data: Age, gender, income overlays from data providers like Experian or Acxiom add $2–$8 CPM on average
- Purchase intent data: In-market signals from retail data partners can add $5–$15 to your CPM
- Household graph matching: Deterministic IP-based household matching is among the most expensive data layers, sometimes adding $10–$20 CPM
- Custom first-party audience segments: Onboarding your own CRM data adds cost through platforms like LiveRamp but can deliver superior ROAS
Aggregators that control their own data ecosystems — such as smart TV OS platforms with ACR (Automatic Content Recognition) data — have a distinct advantage here. ACR data allows them to understand exactly what content viewers watch, enabling incredibly precise targeting that commands significant CPM premiums. (Learn more about ctv)
Managing Data Costs in Your CTV App Choice Set
The key is to audit your data layers regularly and ensure each layer is delivering measurable lift. Many media buyers over-layer data without testing whether the added precision actually improves outcomes versus broader targeting at a lower CPM.
Way #3: Exclusivity Agreements Limit Supply and Inflate CTV CPMs
Aggregators frequently enter into exclusivity or preferential supply agreements with streaming apps and publishers. These deals grant the aggregator exclusive or priority access to certain inventory — which can dramatically affect supply availability and, consequently, CPMs for buyers outside that arrangement.
When a significant portion of premium CTV inventory is locked into exclusive aggregator agreements, the remaining open-market supply decreases. Basic economics then apply: reduced supply with sustained or growing demand equals higher CPMs.
How Exclusivity Affects Your App Choice Set
If your preferred CTV apps have exclusivity deals with specific aggregators or SSPs, you may find that:
- Certain premium inventory is unavailable through your current DSP or buying platform
- CPMs for similar inventory elsewhere have risen due to displaced demand
- You’re compelled to work through a specific aggregator to access key apps — often at a price premium
- Your app choice set becomes effectively narrower, reducing optimization options
This is why multi-platform media buying strategies are increasingly important. Relying on a single aggregator or buying pathway limits your flexibility and often results in paying above-market CPMs.
Negotiating Around Exclusivity Constraints
Experienced media buyers work around exclusivity constraints by:
- Diversifying DSP partnerships to access multiple aggregator pipelines
- Negotiating direct deals with streaming publishers when volume justifies it
- Using private marketplace (PMP) deals to secure guaranteed inventory at pre-negotiated CPMs
- Building flexible app choice sets that can pivot as exclusivity landscapes shift
Way #4: CTV Header Bidding Dynamics and Aggregator Competition
The adoption of header bidding in CTV — while less universal than in display advertising — has introduced a new dimension to how aggregators impact CPM. When multiple SSPs and aggregators compete simultaneously for the same impression, the resulting auction dynamics can both increase and decrease CPMs depending on conditions.
In CTV header bidding environments, competition among aggregators drives CPMs upward on the sell side — good for publishers, but requiring careful bid management for buyers. Understanding how your DSP navigates these multi-aggregator auctions is critical for CPM efficiency.
The Unified Auction Challenge
Unlike desktop programmatic, CTV still struggles with fragmented auction mechanics. Many streaming apps use server-side ad insertion (SSAI), which complicates header bidding implementation and can result in: – Why 98% CTV Delivery Benchmarks Expose 3 Proposal Lies
- Bid duplication: The same impression being bid on through multiple aggregator paths simultaneously, inflating effective CPMs
- Auction opacity: Limited visibility into how bids are evaluated and which aggregator ultimately wins
- Fee stacking: Multiple intermediaries taking margin through the supply chain, increasing the total cost of reaching the viewer
Supply path optimization (SPO) is the practice of identifying and prioritizing the most direct, efficient pathways to CTV inventory — and it’s become a critical skill for managing CPM in aggregator-heavy environments.
Supply Path Optimization (SPO) for CTV Buyers
To implement effective SPO in your CTV buying:
- Audit which SSPs and aggregators are delivering your impressions and at what cost
- Identify redundant paths (multiple SSPs selling the same publisher inventory) and consolidate
- Prioritize aggregators with transparent fee structures and direct publisher relationships
- Work with DSPs that offer path quality scoring to automate SPO decisions
- Regularly review your aggregator mix as supply chain dynamics evolve
Way #5: Brand Safety Controls and Content Targeting Affect the CTV Bid Landscape
The fifth major way aggregators impact CPM is through brand safety and content targeting controls. Aggregators that offer robust brand safety tools — including content categorization, adjacency controls, and viewability verification — command premium access fees that are built into the CPM.
However, these controls also affect which impressions are available to you, directly shaping your effective app choice set and the CPMs you encounter.
How Brand Safety Settings Impact CPM
- Over-restrictive content blocking: Setting too many brand safety exclusions can dramatically reduce available inventory, pushing you toward premium placements at higher CPMs
- Content category targeting: Targeting specific content verticals (e.g., sports, news, lifestyle) concentrates demand and raises CPMs for those categories
- Contextual targeting premiums: Advanced contextual AI tools offered by aggregators add cost layers similar to audience data targeting
- Verification fees: Third-party brand safety and viewability verification (IAS, DoubleVerify) adds per-impression costs that appear in your overall CPM calculation
Balancing Brand Safety and CPM Efficiency
The goal isn’t to abandon brand safety — it’s to be surgically precise about the controls you apply. Conduct regular audits of your block lists and content exclusions. Many media buyers find that broad category exclusions (e.g., blocking all “news” content) are unnecessarily restrictive and simply inflate CPMs without meaningfully protecting the brand. (Learn more about ctv)
Working with aggregators that use episode-level content classification (rather than broad app-level categorization) allows for more precise safety controls that don’t unduly restrict supply and inflate costs.
Optimizing Your CTV Media Strategy Around Aggregators
Understanding how aggregators impact CPM is only valuable if it informs actionable strategy changes. Here are the key optimizations every CTV media buyer should implement:
Build a Multi-Pathway Buying Architecture
- Use multiple DSPs with access to different aggregator relationships
- Combine programmatic open market, PMP deals, and direct publisher relationships
- Avoid over-dependence on any single aggregator that could create price leverage over your campaigns
Conduct Regular CPM Audits by App and Aggregator
- Break out CPM reporting by individual app within your choice set
- Identify which aggregator pathways are delivering the highest and lowest CPMs for comparable inventory
- Use this data to continuously refine your app choice set composition
Invest in First-Party Data to Reduce Reliance on Aggregator Data
Every additional data layer purchased through an aggregator adds to your CPM. Building and activating your own first-party audience data — through CRM onboarding, website pixel data, and loyalty program integration — allows you to reduce dependence on expensive third-party data overlays.
Negotiate Programmatic Guaranteed and PMP Deals
For campaigns with consistent spend levels, programmatic guaranteed (PG) deals and private marketplaces (PMPs) allow you to lock in CPMs with specific publishers through aggregator platforms, removing open auction volatility while maintaining the operational efficiency of programmatic buying.
The Future of CTV Aggregation and CPM Trends
The CTV aggregation landscape is shifting rapidly. Several trends will shape how aggregators impact CPM over the next 2–3 years:
Consolidation of the Aggregator Market
Mergers and acquisitions are reducing the number of independent CTV aggregators. As the market consolidates, fewer major players will control more inventory — which could lead to higher CPM floors and reduced buyer negotiating power unless counterbalanced by DSP SPO capabilities.
Increased Transparency Requirements
Advertiser demand for supply chain transparency is pushing aggregators to adopt ads.txt, app-ads.txt, and sellers.json protocols more rigorously. This increased transparency should help buyers identify fee stacking and optimize supply paths more effectively, ultimately creating downward pressure on inefficient CPMs.
The Growth of Streaming’s Ad-Supported Tier
As major SVOD platforms like Netflix, Disney+, and Max continue expanding their ad-supported tiers, new premium inventory supply is entering the market. This expansion has the potential to moderate CPM inflation, though aggregator deal structures with these platforms will determine how accessible and how efficiently priced this new inventory ultimately becomes.
AI-Driven Yield Optimization
Both sell-side aggregators and buy-side DSPs are deploying AI and machine learning tools to optimize yield and bidding in real time. For media buyers, this means CPM dynamics will become more responsive to micro-signals — content context, time-of-day, device type, household engagement patterns — with increasingly sophisticated automation.
Conclusion
Navigating CTV app choice sets and aggregator dynamics is one of the most nuanced challenges in modern media buying. The five ways aggregators impact CPM — inventory bundling, audience data layering, exclusivity agreements, header bidding dynamics, and brand safety controls — are interconnected forces that require strategic, data-driven management.
The media buyers who consistently achieve the most efficient CPMs in the CTV ecosystem are those who treat aggregator relationships as active strategic partnerships rather than passive transactional pipelines. They invest in supply path optimization, leverage first-party data, build multi-pathway buying architectures, and continuously audit their app choice sets against performance benchmarks.
As the connected TV advertising market continues to mature, the complexity of aggregator dynamics will only increase. The brands and agencies that develop deep expertise in this area now will have a lasting competitive advantage in audience reach, cost efficiency, and campaign performance.
The CPM you pay in CTV is never just a number — it’s the result of dozens of economic and structural forces, many of which flow directly through the aggregators sitting between you and your audience. Understanding those forces is the foundation of intelligent CTV media buying.
