# Visitor identification tags on four named company lists

Which visitor-identification and ABM vendors are installed on the homepages of
the Inc 5000 (2026 list), Y Combinator companies, the Fortune 500 (2026 list)
and unicorn companies, split into company-level and person-level vendors.

Crawl date: rendered homepage archive of 2026-09, scored 2026-09-15.

Denominators: Inc 5000 4,885 domains, Y Combinator 5,386, Fortune 500 472,
unicorns 1,000. A domain counts when its archived record has an HTTP status
under 400 and a non-empty HTML body.

Files:

| File | Rows | Contents |
| --- | --- | --- |
| `by_group.csv` | one per group and vendor | domains and share of the group base |
| `domains.csv` | one per tagged domain | vendors found, person-level flag, consent tool flag |
| `inc_by_industry.csv` | one per Inc 5000 industry | base, any-vendor and person-level counts and shares |
| `yc_by_year.csv` | one per YC batch year | base, any-vendor and person-level counts and shares |
| `fortune500_taggers.csv` | one per tagged Fortune 500 company | rank, company, vendors |

Share columns are fractions, not percentages. Shares are blank where the base
is under 20 domains.

Licensed CC BY 4.0. Source: Installmap.