A portfolio bid strategy is a single automated bid strategy shared by several Google Ads campaigns, so that they all work towards one combined target. Rather than each campaign learning on its own, the strategy pools their data and manages bids across the group.
How a portfolio bid strategy works
You create the strategy once in the shared library, give it a goal, and attach the campaigns you want it to manage. The goals available mirror the standard ones: target CPA, target ROAS, maximise conversions, maximise conversion value, maximise clicks and target impression share.
The target applies to the group as a whole. Suppose a portfolio has a target CPA of £50. One campaign might run at £35 per conversion and another at £70, and the strategy is doing its job if the combined average lands near £50. It moves spend towards whichever auctions across the group are likely to deliver at the best cost.
At the time of writing (October 2026), portfolio versions of target CPA and target ROAS on Search let you set maximum and minimum cost-per-click limits, which the standard campaign-level versions do not. A manager account can also run a portfolio strategy across several client accounts.
A portfolio shares a bidding goal, not money. Each campaign keeps its own budget unless you also use a shared budget, which is a separate setting.
Conversion settings matter here too. Every campaign in a portfolio should count the same conversion actions, or the strategy will compare enquiries in one campaign with page visits in another and steer money accordingly.
Why it matters
Smart Bidding learns from conversions, and many UK small business accounts have campaigns that each record only a handful a month. Split across five campaigns, that is too little for any of them to learn from. Grouped into one portfolio, the same conversions give the strategy something to work with, and performance usually becomes steadier.
Portfolios also keep things tidy. If you run separate campaigns by region or service for reporting reasons, a portfolio lets you keep that structure without fragmenting the bidding.
Common mistakes
- Grouping campaigns whose conversions are worth very different amounts. If a boiler installation is worth far more to you than a service visit, one shared CPA target will happily buy cheap service visits at the expense of installations.
- Including brand campaigns in a portfolio with non-brand ones. Cheap brand conversions pull the average down and let non-brand costs drift up unnoticed.
- Judging each campaign against the portfolio target, then cutting the one that runs above average even though the group is on target.
- Setting bid limits so low that the strategy cannot compete in the auctions that matter.
- Forgetting that budgets are not shared, so one campaign hits its cap while another underspends.
How to act on it
Use a portfolio when several campaigns share the same goal, a similar value per conversion and too few conversions to bid well on their own. Keep brand separate. Set the target from what the campaigns have actually achieved together over the past month or two, not from a hoped-for figure, and leave it alone for at least two weeks after creating it.
Review the portfolio’s own report rather than each campaign in isolation, and look at the spread between campaigns: if one is consistently far from the rest, ask whether it really belongs in the group. Choosing between standard and portfolio strategies, and setting realistic targets, is part of my PPC management work.