B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
47.6%
47.6% -- json ld interior page adoption rate for Fortune 500 companies with homepage JSON-LD (sampled interior pages) (2026-03)
47.6% of sampled Fortune 500 companies that implemented homepage JSON-LD also add interior-page types.
- Based on a sample of 189 companies out of 269 that implemented homepage JSON-LD
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
47.6%
Unit
Percentage
Data Vintage
2026-03
Entity
Sample Size
189
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
65
Freshness
95
Source
ProGEO.ai
Primary
Tier A
https://www.progeo.ai/research/generative-engine-optimization-signals-q1-2026 ↗
Source Article
Signaling the Shift to Generative Engine Optimization (GEO) — ProGEO.ai - Generative Engine Optimization (GEO)
Signaling the Shift to Generative Engine Optimization (GEO)
Key findings — Fortune 500 adoption rates of robots.txt, JSON-LD, and llms.txt
As of March 2026, ProGEO.ai research found:
92.8% (n=464) of the Fortune 500 have implemented robots.txt.
Only 11% (n=55) of the Fortune 500 have named an AI use…
Original Research
ProGEO.ai
· Original study ↗
Methodology
Random sample of interior content pages; 189 of 269 homepage JSON-LD implementers successfully sampled (scanning blocked for 77, inconclusive for 3); range reported as 47.6% of sampled implementations adding page-specific structured data
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Fortune 500 companies with homepage JSON-LD (sampled interior pages): 47.6% json ld interior page adoption rate. Source: ProGEO.ai (2026-03). Via Lighthouse Intelligence -- https://lighthousedata.io/data/fortune500-json-ld-interior-pages-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/fortune500-json-ld-interior-pages-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>47.6%</strong> -- json ld interior page adoption rate for Fortune 500 companies with homepage JSON-LD (sampled interior pages)<br><small>Source: ProGEO.ai (2026-03) · <a href="https://lighthousedata.io/data/fortune500-json-ld-interior-pages-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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