How this site knows anything.

The three series

Each one is a count of filings, expressed as a percentage of the employer’s own headcount as the employer reported it to the SEC. A percentage of headcount is the only form in which two employers of different sizes can be held against each other at all.

LCA and PERM are never pooled

A temporary visa the employer controls and a permanent-residency sponsorship the employer pays for are opposite-signed facts about the same company. Adding them produces a number that means nothing. They are drawn as two series, always.

Follow-through

The ratio between the two: of the sponsorships an employer began, how many it carried through. It is a first-class number on this site rather than a derived one, because it is the question the two series exist to answer together.

The words this site never uses

No adjective this site owns describes an employer. Where a category is needed it uses the government’s attested categories in the government’s words (H-1B_DEPENDENT, WILLFUL_VIOLATOR). The kill-list is enforced in CI, not merely published.

The source register

Every federal source this site has fetched, the exact endpoint it was fetched from, and the instant it answered. Receipts, not data: what is recorded is the endpoint, the time, the size and the digest — never the file. Register generated .

Source Endpoint Fetched at Licence
bls-cpi-area-concordance https://www.bls.gov/cpi/additional-resources/geographic-revision-area-concordance.xlsx us-gov-public-domain
bls-cpi-rent https://download.bls.gov/pub/time.series/cu/cu.data.0.Current us-gov-public-domain
bls-qcew https://data.bls.gov/cew/data/api/2025/1/area/C1118.csv us-gov-public-domain
bls-qcew-area-titles https://data.bls.gov/cew/doc/titles/area/area_titles.csv us-gov-public-domain
census-bps https://www2.census.gov/econ/bps/CBSA%20(beginning%20Jan%202024)/cbsa2607c.txt us-gov-public-domain
census-cbsa-delineation https://www2.census.gov/programs-surveys/metro-micro/geographies/reference-files/2023/delineation-files/list1_2023.xlsx us-gov-public-domain
census-zcta-county https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/tab20_zcta520_county20_natl.txt us-gov-public-domain
fhfa-hpi https://www.fhfa.gov/hpi/download/quarterly_datasets/hpi_at_metro.csv us-gov-public-domain
sec-xbrl-company-facts https://data.sec.gov/api/xbrl/companyfacts/CIK0001730168.json us-gov-public-domain

Exclusions

We don’t cover our founder’s employer or its direct peers. The reason is printed here.