B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
11%
11% -- robots txt ai user agent adoption rate for Fortune 500 companies (AI user agent named in robots.txt) (Q1 2026)
11% of Fortune 500 companies have named an AI user agent in their robots.txt file.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
11%
Unit
Percentage
Data Vintage
Q1 2026
Entity
Sample Size
500
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
ProGEO.ai
Primary
Tier A
https://www.progeo.ai/news/fortune500-geo-research-q1-2026 ↗
Source Article
ProGEO.ai research finds 7.4% of the Fortune 500 have implemented llms.txt — ProGEO.ai - Generative Engine Optimization (GEO)
ProGEO.ai research finds 7.4% of the Fortune 500 have implemented llms.txt
“Signaling the Shift to Generative Engine Optimization (GEO)” measures Fortune 500 adoption rates of technical protocols associated with GEO maturity
(SAN FRANCISCO, March 31,2026) – ProGEO.ai, a data-driven generative engine…
Original Research
ProGEO.ai
· Original study ↗
Methodology
Subset signal within robots.txt adoption: only 11% of Fortune 500 have named an AI user agent in robots.txt, vs 92.8% with robots.txt overall.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Fortune 500 companies (AI user agent named in robots.txt): 11% robots txt ai user agent adoption rate. Source: ProGEO.ai (Q1 2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/fortune500-robots-txt-ai-user-agent
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<blockquote cite="https://lighthousedata.io/data/fortune500-robots-txt-ai-user-agent" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>11%</strong> -- robots txt ai user agent adoption rate for Fortune 500 companies (AI user agent named in robots.txt)<br><small>Source: ProGEO.ai (Q1 2026) · <a href="https://lighthousedata.io/data/fortune500-robots-txt-ai-user-agent" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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