B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
39%
39% -- share of companies testing subject lines for email marketers (2026)
39% of companies test email subject lines first.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
39%
Unit
Percentage
Data Vintage
2026
Entity
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
LLCBuddy
Primary
Tier C
https://alpacarelay.com/tools/architect-email-layout-for-content-digest-email ↗
Source Article
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Content Digest Email Layout: Before…
Original Research
LLCBuddy
· Original study ↗
Methodology
Cited from LLCBuddy A/B Testing Statistics
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email marketers: 39% share of companies testing subject lines. Source: LLCBuddy (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/companies-test-subject-lines-39
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<blockquote cite="https://lighthousedata.io/data/companies-test-subject-lines-39" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- share of companies testing subject lines for email marketers<br><small>Source: LLCBuddy (2026) · <a href="https://lighthousedata.io/data/companies-test-subject-lines-39" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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