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Vendor reportGraphite and Similarweb, 2026

B2B SaaS takes the biggest share of US ChatGPT ad impressions at 19.9%

Channel mix & planning

CategoryShare of ad impressions (%)Number of advertisers (count)
B2B SaaS19.9%1,210
Retail & Consumer Brands10.4%1,510
Business & Professional Services8.5%2,231
Career & Employment5.5%104
Developer Tools & Infrastructure4.6%339
Education & Training4.3%414
Ecommerce & Website Platforms4%76
Finance & Insurance3.8%222
Travel & Hospitality3.5%232
Electronics & Hardware3.4%198
Affiliate & Comparison Sites3.1%59
AI Tools & Platforms3.1%267
Design & Creative Tools3.1%95
Industrial & Business Supply2.5%473
News & Publishing2%88
Local Services1.6%662
Cybersecurity1.6%32
Automotive1.6%249

Share of ChatGPT ad impressions by category, with advertiser counts (US)

Reader Note:
Figure shows share of ChatGPT ad impressions by advertiser category among top US advertisers from March 30 to August 4, 2026, using Similarweb data with Graphite's advertiser taxonomy. B2B SaaS leads at 19.9% with 1,210 advertisers, ahead of Retail & Consumer Brands at 10.4% with 1,510 advertisers and Business & Professional Services at 8.5% with 2,231 advertisers. Impression share is not the same as advertiser count, so a category can have fewer advertisers but a larger share of impressions.
Evidence:
Observed behaviour
Vendor interest:
Moderate — This comes from a company with a commercial interest in this market, so it is not a neutral source.
Sample:
Similarweb user panel across 9 live ChatGPT ad markets (panel size not disclosed), plus Graphite analysis of 95k+ US ChatGPT ads from 500+ advertisers, 70k+ creatives, 50k+ headlines, and 8k+ landing pages from April to mid-August 2026.

Good for

Comparing yourself against a similar segment, and choosing what to test next.

Not for

  • Saying that one thing caused another, or predicting what you would get.
  • This comes from a company with a commercial interest in this market, so it is not a neutral source.
  • The source says how much it looked at, but not how any of it was chosen.
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