There are five families of sources that we unify and standardize to construct a comprehensive sense of the workforce dynamics of companies: (i) online professional profiles: full time series of an individual, including dates of employment, companies, titles, education, skills, and more; (ii) job postings: posting dates, job descriptions, and salaries for each position; (iii) employee sentiment: both review scores and actual reviews; (iv) government data: published labor statistics, domestically and globally, in addition to immigration filings, census data, social security administration data, and voter registration data; and (v) firmographic data: subsidiary-parent relationships of companies, industry classifications, and mapping to financial identifiers.