Depending on a single ad platform concentrates risk: a policy change, a rise in costs or a suspension can paralyse the business. Thinking of channels as a portfolio, with different roles, risks and returns, makes the company more resilient and growth more sustainable.
The essentials in a definition
A channel portfolio is the deliberate combination of ad platforms, thought of in terms of risk, return and dependence, as in a diversified investment. Depending on a single platform exposes you to changes in rules, costs and suspensions. Models such as Meridian, conversion measurement and Think with Google studies help assess each channel’s contribution.
The risk of dependence
Many SMEs have 80 or 90% of paid sales on a single platform. If costs rise, the account is suspended or policy changes, revenue falls immediately. There is no time to react.
Dependence also reduces bargaining power and the ability to learn from other channels.
Thinking like an investor
Each channel has an expected return, volatility and correlation with the others. Some are predictable and scalable (search), others more uncertain but with potential (video, social, affiliates). Mixing reduces overall risk.
Define each channel’s role: capture demand, generate demand, reactivate customers, build brand.
Building a channel portfolio
- Measure current dependence
- Define each channel’s role
- Test a second channel on a limited budget
- Rebalance every quarter
Building the portfolio
Start with the main channel well optimised. Add a second channel of a different nature with a test budget (for example 10 to 20% of the total). Keep owned channels (email, community, SEO) that do not depend on auctions.
Avoid diversifying too early: each channel takes time, data and creative.
Whoever has one channel has one point of failure.
Tracking and rebalancing
Review the distribution quarterly: return, cost per new customer, dependence. Move budget to where marginal return is best. Have a contingency plan: what to do if the main platform fails.
Record the lessons from each channel.
Decision table
| Channel role | Example | Guiding weight |
|---|---|---|
| Capture existing demand | Search | Base of return |
| Create demand | Video and social | Long-term growth |
| Reactivate and retain | Email and remarketing | High margin |
| Experiment | New channels | Small part of the budget |
Common mistakes to avoid
- Putting everything on the channel that “works”. Dependence raises risk and saturation reduces return.
- Over-diversifying. Many channels without enough data scatter effort.
- Assessing only by attribution. Top-funnel channels look worse than they are.
How to measure the result
Track the percentage of revenue and spend by channel, marginal return and overall margin, and review the portfolio quarterly.
Limits and exceptions
There is no universal ideal distribution: it depends on sector, maturity and budget. Diversifying has management and content-production costs, and in very small accounts it may be preferable to master one channel before opening another. Assessing channel contribution is imperfect; use several methods and review with humility.
Illustrative example
Illustrative example: a shop spends 85% of its budget on a single platform and, after a temporary account suspension, loses two weeks of sales. It starts spreading budget between search, video, email and a test channel, with limits per channel. Revenue becomes more stable, and the company no longer has a single point of failure.
In practice: checkpoints
Set a maximum dependence on any single channel, for example a percentage of total sales, and review it every quarter. Keep a small budget on a second and third channel, test new ones with clear limits, and write down what you would do if the main channel became more expensive or was restricted. A portfolio is judged by the stability of results as well as by the best channel’s return.
Frequently asked questions
How much should I have in each channel?
It depends on the business. One main channel and one or two test ones is a good starting point.
Does diversifying cost more?
In the short term, yes. In the long term it reduces risk and opens new sources.
Which owned channels should I have?
Email, content, community and SEO, which do not depend on auctions.
How many channels should I have?
The number you can manage with quality, generally two to four, plus a testing space.
How do I assess a top-funnel channel?
With incrementality tests, brand searches and assisted conversions, besides last-click attribution.
Think of channels as a portfolio: a core that captures demand, channels that create it and a testing space, to reduce dependence on a single platform.
Sources and recommended reading
Last editorial review: October 2026. Informational content; always confirm current conditions in the official sources before deciding.