Work history is the section of an Upwork profile that lists a freelancer's or agency's completed and in-progress contracts, with each contract's title, dates, the rate and hours for hourly work, and the feedback the client left.
Every contract on Upwork leaves a line on the work history. The line shows the job title as the client wrote it, when the contract started and ended, and the public feedback with its star rating and comment. For hourly contracts it also shows the rate, the hours and the amount billed; for fixed-price contracts the amount shown depends on what Upwork chooses to print, and the client is never named, only their country and whether they are a repeat client. Contracts that are still open sit in a separate list of jobs in progress.
Clients read the work history more carefully than anything else on a profile, because it is the only evidence of what the account has actually delivered. A long history of mid-sized contracts with consistent feedback is worth more to most clients than a few large ones, and a line that says "No feedback given" is noticed.
The history is not editable. A freelancer can reply to feedback and, with the Top Rated perk, have one review removed, but contracts cannot be hidden or reordered. What the history does not show is when money was earned in aggregate, which is why it cannot be turned into a revenue figure.
How Upwork Insights uses it
The index does not read or store individual contracts for any of the 28,921 agencies it holds. It reads the counters that sit above the history, total earned, jobs and hours, as listed in the methodology. The one thing taken from the history itself is the date of the most recent contract, which stands in for momentum in the Index Score when an agency has been observed only once and no run-rate can be measured yet.