Search Engine Marketing and Paid Search: Industry Report

Summary

This report covers search engine marketing and paid search on a global scope, with national figures for the United States, United Kingdom and Australia from the latest available data ¹²¹¹¹². US search advertising revenue, including AI search, reached 114.2 billion dollars and grew 11 percent, but growth has slowed considerably ¹. Search held 38.8 percent of US digital ad revenue, behind social media at 40.0 percent ¹. Google's Search and other revenue rose to 224,532 million dollars, which the company attributes to more mobile queries and higher advertiser spending ³. Principal risks include platform concentration, which UK regulators have acted on ¹⁰¹¹, cost-per-click increases in vendor-compiled data ⁵, and attribution that depends on platform-supplied conversion data ⁷⁸. The outlook points to a large channel with growing automation and AI-led formats ⁹. Consent, brand safety and agency-fee evidence is not available in the source pack.

Key findings

1. 1

   US search advertising is large and still growing, but more slowly

   US search advertising revenue, including AI search, reached 114.2 billion dollars in the latest full year, up 11 percent year over year, with the industry association reporting that growth slowed considerably versus prior years ¹.

   Confidence: High
2. 2

   Search leads the US channel mix on some measures but not others

   Search held 38.8 percent of total US digital ad revenue, behind social media at 40.0 percent ¹. A secondary estimate instead places search as the largest channel in global online ad spend at 39 percent, a forecast that was not checked against the original source ⁶. The two results use different scopes and should not be combined.

   Confidence: High
3. 3

   Platform revenue growth is attributed to mobile queries and advertiser spend

   Alphabet reports Search and other revenue of 224,532 million dollars, up from 198,084 million, and attributes growth to more queries on mobile, higher advertiser spending and improved ad formats and delivery ³. This is a company line, not a total market measure.

   Confidence: High
4. 4

   Platform concentration is high in the UK and now subject to regulatory designation

   Google accounts for over 90 percent of UK general search queries, and more than 200,000 UK businesses advertise on its search advertising services ¹¹. The CMA has designated Google with strategic market status in general search, including search advertising ¹⁰.

   Confidence: High
5. 5

   Vendor data show clicks and prices rising together in the second quarter

   A vendor compilation reports Google paid clicks up 13 percent and cost per click up 3 percent year over year in the second quarter, and a technology provider's trend report shows paid search spend up 17 percent with flat clicks and rising cost per click ⁵. These are secondary, unverified figures.

   Confidence: Medium
6. 6

   Attribution and automation change how credit is assigned

   Data-driven attribution is specific to each advertiser and depends on its conversion data ⁷. Third-party commentary notes that it can favor channels with better tracking and that tracking changes can shift credit between campaigns ⁸. Google reports a 7 percent average conversion gain for its AI Max feature set, a company-reported figure ⁹.

   Confidence: Qualitative

1Industry definition and scope

This report covers search engine marketing (SEM) and paid search: the purchase of advertising that appears on search engine results pages, usually through auction-based platforms. The UK Competition and Markets Authority describes search advertising as the service in which an advertiser pays for its advert to appear next to a user's search results ¹¹. Organic search optimization is outside scope.

Geographic scope is global. Where sources are national, figures are labelled: United States revenue ¹², United Kingdom regulatory data ¹⁰¹¹ and Australian revenue ¹². The reporting period is the latest available data. The sources do not share one period, so this report does not combine them into a single series.

Terminology is not uniform. The industry association reports search revenue including AI search ¹. Alphabet reports a 'Google Search and other' revenue line, which is a company line rather than a market total ³. Vendor compilations describe paid search spend without a shared definition ⁵. The metrics used here are the writer's definitions: cost per click (CPC) is the amount paid per ad click; cost per thousand impressions (CPM) is the cost per 1,000 ad impressions; conversion rate is conversions divided by clicks; customer acquisition cost (CAC) is spend divided by new customers; return on ad spend (ROAS) is attributed revenue divided by ad spend. The source pack does not state attribution windows, so conversion-based metrics are platform-defined and not directly comparable.

Definitions are the writer's own. Terms are kept as the sources use them.

2Market size, structure and value chain

Latest available data place US search advertising revenue, including AI search, at 114.2 billion dollars, up 11 percent year over year ¹. Total US digital advertising revenue reached 294.6 billion dollars, up 13.9 percent ². Search therefore holds a large but not dominant share, 38.8 percent of US digital ad revenue, compared with 40.0 percent for social media ¹. The industry association notes that search growth slowed considerably compared with prior years ¹².

Global data are thinner. A secondary aggregator cites forecasts that search takes 39 percent of global online ad spend and that total global online ad spend is about 680 billion dollars ⁶. These figures were not confirmed against the original forecasts and are treated as indicative only. Australian search advertising reached 8.0 billion in the latest year, growing 11.5 percent to a new annual high; the currency is not stated on the page and is reported as Australian dollars ¹².

Platform scale is visible in company filings. Google reported Search and other revenue of 224,532 million dollars, up from 198,084 million ³, and total Google advertising revenue of 294,691 million dollars including YouTube ads and Google Network ³. These are company totals and are not a measure of the search advertising market alone.

The value chain runs from advertisers (brands, retailers and service businesses) that set objectives and budgets, to agencies or in-house teams that build campaigns, keywords, bids and ad copy, to platforms that run the auction and serve ads. Technology providers such as Skai publish trend data and campaign tools ⁵. Measurement partners and publisher networks are part of the chain, but the pack has no verified data on their size or fees. Revenue is typically auction-based and charged per click; the pack describes click volume and price as driven by advertiser spending, product and policy changes and mobile query fluctuations ⁴.

• US search advertising revenue, including AI search 114.2US dollars, billions Observed United States, Latest full calendar year [1]
• Search share of US digital ad revenue 38.8percent Observed United States, Latest full calendar year [1]
• Google Search and other revenue 224,532US dollars, millions Observed Global, Latest full calendar year [3]

Global forecast figures are from a secondary aggregator and are not verified against original forecasts. Company totals are not market sizes.

3Customers, demand and adoption

Advertisers are the core demand base. More than 200,000 UK businesses advertise on Google's search advertising services ¹¹. The pack gives no equivalent count for the United States, Australia or globally, so breadth of adoption outside the UK cannot be measured from these sources.

Demand drivers in the latest period, as reported by Alphabet, include more search queries on mobile devices, higher advertiser spending and improved ad formats and delivery ³. US search revenue grew 11 percent ¹, which the industry association describes as a slowdown. The pack contains no survey data on how users search or respond to ads, so changes in audience behavior are only indirectly visible.

Purchasing criteria in the sources center on cost and outcome: CPC, conversion rate, CAC and ROAS. The pack does not provide verified benchmarks for these metrics by industry, so this report does not state typical values. The writer's interpretation is that buyers are judging search more closely on cost efficiency as click prices move, as Section 4 discusses.

Barriers and changing expectations are visible in platform change. Google reports that legacy features such as Dynamic Search Ads, automatically created assets and campaign-level broad match are migrating to AI Max ⁹, which implies less manual control for buyers. Google also reports an average of 7 percent more conversions or conversion value at similar CPA or ROAS with the full AI Max suite than with search term matching alone ⁹. This is a company-reported average and has not been independently verified.

Brand safety and consent expectations matter to buyers, but the pack has no verified source on brand-safety tools, consent rates or user privacy choices in search.

Adoption data are limited to the UK for advertiser counts. The AI Max figure is a platform-reported average.

4Competitive landscape and key players

Concentration is high in the market the pack covers in detail. Google accounts for over 90 percent of UK general search queries ¹¹. The CMA has designated Google with strategic market status in general search, including search advertising ¹⁰. This is a regulatory designation under the Digital Markets, Competition and Consumers Act in the UK. The pack does not describe any resulting conduct requirements, so their content is not reported here.

Share data for other platforms are weak. Microsoft Advertising, Amazon Ads and Meta are named in the source pack only as platforms for which no verified primary share data was retrieved. Social media's 40.0 percent share of US digital ad revenue ¹ shows that search competes with other large ad surfaces, but it does not measure substitution between them.

Provider types differ in business model. The platform owner sells auction-based placements and self-serve tools, illustrated by Google's Search revenue growth ³. Technology and reporting providers, illustrated by Skai, publish trend reports and campaign tools ⁵. Agencies and in-house teams are a provider type for which the pack has no market data. Independent publishers offer explainers, such as Usermaven's commentary on attribution models ⁸. Platform differentiation rests on automation features, formats and measurement. The pack documents AI Max and data-driven attribution ⁷⁹ but gives no comparative performance benchmarks across platforms.

Competitive pressure appears in price and volume. Vendor-compiled second-quarter data show Google paid clicks rising faster than cost per click, while Skai's trend report shows spend up with clicks flat and cost per click rising ⁵. The table below summarises these indicators. Because they come from a compilation, they are secondary evidence.

A fair comparison across providers needs independent, like-for-like data. The pack contains only self-reported platform data and one vendor trend report.

5Technology, operations and workforce

Automation is the central technology shift in the pack. Google describes AI Max as the successor to Dynamic Search Ads, automatically created assets and campaign-level broad match ⁹. The company reports the 7 percent average gain noted earlier; the pack gives no sample size, test design or independent check for it.

Attribution is a measurement technology issue. Data-driven attribution uses the advertiser's own conversion data to calculate each ad interaction's contribution across the conversion path, and each model is specific to the advertiser and improves with more conversion data ⁷. Third-party commentary notes that data-driven attribution can favor channels with better conversion tracking and that changes in tracking quality can shift credit between campaigns ⁸. Google Ads currently supports data-driven and last-click models for conversion actions ⁸. Advertisers should audit tracking before relying on credit allocation.

A typical campaign workflow runs from goal setting and conversion tracking set-up, through keyword and audience structure, bidding strategy and ad creation, to reporting and reallocation. This workflow is the writer's summary of general practice; the pack includes no operational benchmarks.

The pack contains no verified data on agency staffing, salaries, skills demand or training. The changing professional requirement is inferred from the shift toward automation ⁹ and the complexity of attribution ⁷⁸. The writer's interpretation is that practitioners will need stronger skills in data quality, conversion measurement and reading model outputs critically.

The pack does not show how agency fee models are changing. A plausible implication of platform automation is that value shifts from manual bid management toward data inputs, measurement and strategy, but this is interpretation, not a sourced finding.

No workforce or productivity data were retrieved for paid search.

6Regulation, standards, risk and sustainability

Jurisdiction and status. The clearest binding instrument in the pack is UK competition regulation. The CMA designated Google with strategic market status in general search, including search advertising, under the Digital Markets, Competition and Consumers Act ¹⁰. A designation opens further regulatory steps. The pack does not list resulting conduct requirements, so their content and timing are not reported here.

The CMA's investigation covered Google's general search and search advertising activities ¹⁰. The CMA's announcement described search advertising in terms the report uses in Section 1 ¹¹. For the United States and Australia, the pack contains no binding rule, proposal or voluntary guidance on search advertising. Industry guidance on paid search measurement, such as standards from bodies that cover brand lift or incrementality, was not retrieved.

Privacy and consent are material but unsourced. The pack has no verified source on consent rules for search advertising, identifier rules or data protection requirements in any jurisdiction. Advertisers should obtain jurisdiction-specific legal advice. This report is not legal advice.

Brand safety and ethics are not covered by verified sources. Ethical questions about automated ad creation and AI-generated assets are raised by the platform shift ⁹, but the pack has no source on AI disclosure rules or brand-safety standards.

Operational risks in the pack are platform dependency, given the over 90 percent UK query share ¹¹; policy and product changes that affect cost per click ⁴; and attribution credit that moves with tracking quality ⁸. Sustainability and social factors of search advertising are not covered by the pack.

Regulatory facts are limited to the UK. Other jurisdictions are described as gaps, not as findings.

7Challenges, opportunities and case examples

Constraints. Media cost pressure is the most visible in the pack. Vendor-compiled data show cost per click rising while paid clicks also grow ⁵. Cost per click moves with advertiser spending, product and policy changes and mobile query fluctuations ⁴. Advertisers also face platform concentration ¹¹ and automation they do not fully control ⁹.

Opportunities. Search revenue growth remains positive in the latest data ¹³. Mobile query growth ³ and newer ad formats support demand. Advertisers that measure conversions well may get better results from automation, although the pack's only evidence for this is the platform's own average ⁹.

Example 1: Google. Alphabet's annual filing reports Search and other revenue of 224,532 million dollars, up from 198,084 million, and attributes growth to mobile queries, higher advertiser spending and improved formats and delivery ³. The company is also the subject of the UK competition designation ¹⁰.

Example 2: Skai. Skai's second-quarter trend report, as compiled by a vendor, reports paid search spend up 17 percent, with clicks relatively flat and cost per click rising ⁵. This is one provider's sample and not a market-wide measure.

Comparable examples were limited. The pack's only verified company-level filings are Alphabet's. Named-agency and publisher examples, and publisher-side spend figures, were not verified and are not used.

Examples are illustrative of the pack's evidence and are not a sample of the market.

8Outlook and strategic implications

Near term: search is likely to stay one of the largest ad channels, with latest data showing positive but slowing growth ¹². The forecast that search is the largest global channel ⁶ is unverified and should be treated as directional.

Medium term: automation and AI-led formats are likely to take more of campaign control, based on Google's migration of legacy features ⁹. Attribution will stay platform-dependent unless advertisers reconcile conversion data across sources ⁷⁸. UK oversight of platform conduct is expected to continue ¹⁰, but its effect on advertisers is uncertain.

Key uncertainties include whether cost-per-click increases persist ⁵, whether AI features deliver the reported gains ⁹, and how privacy and consent changes will affect measurement, which the pack does not cover.

Implications (the writer's interpretation). Advertisers should audit conversion tracking, define success metrics and test automation against controlled comparisons. Agencies should document how they use automated bidding and how they explain attribution changes to clients. Platforms face regulatory scrutiny of concentration ¹⁰. Measurement partners and regulators need independent data that the pack does not contain.

• Search share of global online ad spend (secondary forecast) 39percent Forecast Global, Latest forecast period [6]

The global share is a secondary forecast not checked against the original source.

9Conclusion

Search advertising remains a large and growing, though slowing, channel. Platform concentration and automation are shaping how it is bought and measured ¹³⁹¹¹. The most defensible takeaways are that revenue scale is documented by industry and company sources, that cost and attribution claims rest on vendor or company sources, and that consent, brand safety and agency-fee evidence is missing from the pack.

How this was built

Sources

1. 1

   IAB/PwC Internet Advertising Revenue Report: Full Year (press release, PR Newswire)

   IAB and PwC Industry association

   prnewswire.com
2. 2

   IAB Internet Advertising Revenue Report: Full Year (press coverage, TV Technology)

   IAB Industry association

3. 3

   Alphabet Inc. Form 10-K for fiscal year (SEC filing)

   Alphabet Inc. (SEC filing) Company report

4. 4

   Alphabet Inc. Form 10-Q for the quarter ended in the third quarter (SEC filing)

   Alphabet Inc. (SEC filing) Company report

5. 5

   Search engine marketing statistics: latest compilation (vendor-aggregated, citing Alphabet 10-Q, IAB/PwC and Similarweb)

   Market Intelligence Tools Vendor report

   marketintelligencetools.com
6. 6

   Online advertising statistics: latest compilation (Searchlab, citing eMarketer, Statista and IAB)

   Searchlab (citing eMarketer, Statista and IAB) Market research

7. 7

   Google Ads Help: About data-driven attribution

   Google Company report

   support.google.com
8. 8

   Google Ads attribution models guide (third-party explainer)

   Usermaven News report

   usermaven.com
9. 9

   We're upgrading Dynamic Search Ads to AI Max (Google, Accelerate with Google)

   Google (Accelerate with Google) Company report

10. 10

    Google's general search and search advertising services (SMS designation case page)

    UK Competition and Markets Authority (GOV.UK) Regulator

    gov.uk
11. 11

    CMA to investigate Google's search services (press release via Wired-Gov)

    Competition and Markets Authority Regulator

12. 12

    IAB Australia Internet Advertising Revenue Report, December quarter and full-year data (IAB Australia and PwC Australia)

    IAB Australia and PwC Australia Industry association

    iabaustralia.com.au