A portfolio bid strategy is a single automated bid strategy that several campaigns share, so that one goal and one set of settings govern bidding across all of them. Google Ads defines it as a "goal-driven bid strategy that groups together multiple campaigns, ad groups, and keywords", according to its help centre. The opposite is a standard bid strategy, which belongs to one campaign alone. Portfolios exist for two reasons. They pool conversion data, which automated bidding needs in volume, and they let an advertiser judge a group of campaigns by one average rather than holding every campaign to the same target. A brand campaign that converts cheaply and a generic campaign that converts expensively can then be traded off against each other inside a shared goal.

How a portfolio works

A portfolio is built in two steps. First the advertiser creates the strategy as a standalone object, chooses its type and names it. Then campaigns are attached to it. In Google Ads, as of October 2026, portfolios are created under Tools, then Budgets and bidding, then Bid strategies, which Google's help pages still call the Shared library. Google Ads Editor, the desktop tool, still labels them "flexible bid strategies", their original name.

Six strategy types can run as portfolios in Google Ads. Four are Smart Bidding strategies that optimise for conversions: Target CPA (cost per acquisition), Target ROAS (return on ad spend), Maximize conversions and Maximize conversion value. Two optimise for traffic or visibility: Maximize clicks and Target impression share. The type is fixed at creation. A Target CPA portfolio cannot be switched to Target ROAS; the campaigns must be moved to a different portfolio instead.

Once campaigns share a strategy, the target applies to the group. "With a portfolio strategy, your campaigns, ad groups, and keywords are optimized collectively for a single target," Google's Target CPA documentation says. The interface reports an average target CPA or average target ROAS, a traffic-weighted figure for what the strategy actually aimed at.

A worked example shows the trade. Suppose a retailer runs a brand campaign that converts at 30 euros and a generic campaign that converts at 90 euros, and sets a 50 euro Target CPA. Run separately, the generic campaign would be squeezed toward 50 euros. In a portfolio, 200 brand conversions at 30 euros and 50 generic conversions at 90 euros average 42 euros, below the target, so the bidder has room to buy more of the expensive generic conversions until the blend reaches 50.

Portfolios also carry controls that standard strategies lack. Bid limits, a maximum and minimum cost-per-click (CPC) bid, are available for Target CPA and Target ROAS only on portfolio strategies, and apply only in Search Network auctions, according to Google. The minimum is not a hard floor: Google says its algorithm "might set a max. CPC bid that's below your minimum bid limit". Google advises against both, and flags a portfolio as "Limited" when they constrain spend. In the Google Ads API the fields are cpc_bid_ceiling_micros and cpc_bid_floor_micros, as PPC Land's Max CPC explainer sets out.

Budgets are the other half. Google recommends pairing a portfolio with a shared budget, one daily amount spread across the same campaigns, and lets the two be linked so that adding a campaign to the strategy adds it to the budget. Google says customers adopting shared budgets and portfolios on Search saw "+13% more conversions", based on its internal data from January 2024 to March 2025, a self-reported figure. When a Maximize campaign shares a budget with campaigns outside its portfolio, the strategy is marked "Misconfigured".

Where portfolios can and cannot run

Coverage is uneven. Google's help centre says portfolios are not available for Performance Max, Hotel or Travel campaigns; Performance Max must set its strategy directly on the campaign. Its Target ROAS page says portfolio Target ROAS does not apply to App install, Demand Gen or Shopping campaigns, yet describes Shopping portfolio bid limits in the same document, and Google's cross-account page confirms Shopping portfolios.

Cross-account bid strategies extend the portfolio upward. They are owned by a manager account (MCC) and can include campaigns from several client accounts, provided all use the same currency, which cannot be changed later. Search campaigns can use all six types; Shopping campaigns only Target ROAS. Unlinking a client account from the manager marks its campaigns with an "invalid bid strategy type", and they stop serving until a new strategy is chosen.

Origin and evolution

The concept arrived as flexible bid strategies. On May 20, 2013, Andrea Cohan, a product marketing manager at Google, announced on the AdWords blog that "flexible bid strategies let you apply multiple bidding strategies within a single campaign or across campaigns". The launch set, housed in the Shared library, covered Target search page location, Maximize clicks, Target CPA (a flexible version of Conversion Optimizer) and Enhanced CPC. Target ROAS and Target outranking share followed.

The name changed in 2016. Search Engine Land's Ginny Marvin reported that flexible strategies would become "portfolio" bid strategies and that a strategy applied to one campaign would be called "standard". Conversion Optimizer became Target CPA, and portfolio Target CPA gained separate goals per ad group. By October 3, 2016, DoubleClick Search, now Search Ads 360, was syncing "AdWords portfolio bid strategies".

Google then pruned the menu. On June 19, 2019 it announced that new Enhanced CPC portfolios could no longer be created from July 2019, that existing ones would be converted to campaign-level Enhanced CPC, and that Maximize clicks portfolios would lose their target spend setting in favour of average daily budgets. Target search page location and Target outranking share had already been retired in favour of Target impression share.

Cross-account bidding followed. After a preview in summer 2020, Google said on February 3, 2021 that all advertisers could combine campaigns from different accounts into a single portfolio for Search and standard Shopping. David McNair, paid search manager at GetYourGuide, said in Google's announcement: "We were able to increase our conversion value by 14% using portfolio bid strategies across different accounts."

Microsoft Advertising arrived later. It rolled out portfolio bid strategies globally in February 2022 and added Maximize conversion value to portfolios in September 2024. On May 19, 2026, Priya Bhasin, a principal product manager at Microsoft, announced that cross-account portfolio bidding was available for Search and Shopping campaigns.

Why it matters for marketers

Portfolios are the main lever for advertisers whose individual campaigns are too small for Smart Bidding to learn from. Google product managers Kristina Park and Carlo Buchmann presented them in March 2026 as a way to group campaigns with shared targets and pool conversion data. Adding campaigns restarts the learning period on both platforms; Microsoft says portfolios need "a few weeks", a cost described in PPC Land's learning phase explainer.

Portfolios have also become the last refuge for hard price ceilings. When Microsoft removed maximum CPC from new non-portfolio campaigns on October 1, 2026, portfolio strategies kept the field. On Google, bid limits for Target CPA and Target ROAS exist only in portfolios.

At the enterprise end, Search Ads 360 runs its own portfolios across engines. Its Target ROAS portfolios span Google Ads, Microsoft Advertising, Yahoo! JAPAN Ads and Baidu campaigns, according to its help centre. Since August 2024 a single strategy can mix Google and Microsoft auction-time bidding; Stephen Yap, managing director of Google Marketing Platform, was reported as saying multi-engine portfolios typically lift conversions or value by 5%.

Limitations and criticisms

The blended average is both the feature and the main risk. A portfolio that hits its 50 euro target may be doing so by running brand campaigns at 20 euros and prospecting campaigns at 120, a mix the headline number hides. Google discourages per-ad-group targets because they "restrict Smart Bidding", leaving few tools for campaign-level discipline beyond splitting portfolios.

Control is limited in other ways. Bid limits apply only on Search and the minimum can be breached. Cross-account portfolios add an operational hazard: one account unlinked from a manager stops its campaigns serving.

The August 2026 bidding change exposed a further dependency. From August 17, Google began lifting budget-capped Target CPA and ROAS campaigns toward their stated targets. Google's FAQ says the change "applies to portfolio bidding and shared budget setups": in portfolios with separate budgets only budget-constrained campaigns are affected, and target fixes must be made at portfolio level. Google's suggested response is to consolidate more campaigns under portfolios or shared budgets.

Not the same as

Standard bid strategy. The same strategy types attached to a single campaign.

Shared budget. A spending pool, not a bidding rule. It is often linked to a portfolio but can exist without one.

Cross-channel bidding. Google's term for a single campaign, such as Performance Max, that bids across Search, YouTube, Gmail and other inventory toward one goal. Portfolios optimise within a channel.

Search Ads 360 budget bid strategies. SA360 tools that allocate a fixed monthly budget across campaigns, distinct from Google Ads portfolios and capable of spanning engines.

Recent developments

Google restored Target CPA and Target ROAS as standalone labels from June 2026, a change it called visual; PPC Land noted the help centre did not address how portfolio names would change. The August 17 target change finished its global rollout on August 27, 2026, according to Google, with ad group targets also in scope. Microsoft made seasonality adjustments for portfolios fully available by May 2026 and added portfolio-level average target metrics to its bid strategy report. As of October 2026, Google still excludes Performance Max from portfolios, and on Microsoft portfolios remain the only place a new automated campaign can carry a CPC cap.

Timeline

  • May 20, 2013: Google announces flexible bid strategies in AdWords, housed in the Shared library
  • 2013 to 2015: Target ROAS and Target outranking share added as flexible strategies
  • 2016: Flexible strategies renamed portfolio bid strategies; single-campaign strategies become "standard"; Conversion Optimizer becomes Target CPA
  • October 3, 2016: DoubleClick Search begins syncing AdWords portfolio bid strategies
  • June 19, 2019: Google announces removal of new Enhanced CPC portfolios and Maximize clicks target spend from July 2019
  • Summer 2020: Cross-account bid strategies previewed for manager accounts
  • February 3, 2021: Cross-account portfolios opened to all Google Ads advertisers for Search and standard Shopping
  • February 2022: Microsoft Advertising rolls out portfolio bid strategies globally
  • August 22, 2024: Search Ads 360 lets one strategy combine Google and Microsoft auction-time bidding
  • September 3, 2024: Microsoft adds Maximize conversion value to portfolios
  • May 19, 2026: Microsoft launches cross-account portfolio bidding for Search and Shopping
  • June 2026: Google restores Target CPA and Target ROAS labels
  • August 17 to 27, 2026: Google's target change for budget-constrained campaigns rolls out, including portfolios
  • October 1, 2026: Microsoft removes Max CPC from new non-portfolio campaigns; portfolios keep it

Summary

Who: Google operates portfolio bid strategies in Google Ads and Search Ads 360; Microsoft Advertising runs its own version. Advertisers, agencies and manager-account holders create them and attach campaigns.

What: A single automated bid strategy, such as Target CPA, Target ROAS, Maximize conversions, Maximize conversion value, Maximize clicks or Target impression share, shared by several campaigns and judged on one blended target.

When: Introduced as flexible bid strategies on May 20, 2013, renamed portfolios in 2016, extended across Google accounts on February 3, 2021 and across Microsoft accounts on May 19, 2026.

Where: Mainly Search and Shopping campaigns. Google excludes Performance Max, Hotel and Travel; portfolios are stored in the Shared library under Budgets and bidding.

Why: Pooling campaigns gives automated bidding more conversion data and lets cheap and expensive campaigns balance under one goal. Critics note that the same averaging can hide weak campaigns behind strong ones.