The momentum component is the part of the Index Score, worth 15 of 100 points, that measures whether an agency or freelancer is earning faster or slower now than over the life of the account.
It is the only part of the Index Score that uses something the index measures rather than a figure read off the page. When a measured run-rate and a lifetime pace both exist, the component is half marks plus half of the ratio between them minus one, clamped between zero and one: a run-rate equal to the lifetime pace earns 7.5 points, double the pace earns the full 15, and a run-rate of zero earns none. When a run-rate exists but there is no lifetime pace, because the account is under six months old or its earnings are hidden, a positive run-rate earns 0.7 of the points and zero earns 0.3. When there is only one observation and no run-rate at all, the component falls back on recency of the last contract.
The design rewards acceleration, not size. A small agency earning twice its historical pace outscores a large one that has slowed, which is the point: the default ranking by lifetime earnings already favours size.
The common misreading is that a low momentum score means a bad agency. It can mean a mature one that has settled at its long-run pace, or simply one the index has read only once; the page says which.
How Upwork Insights uses it
The momentum points are drawn in the Index Score breakdown on every one of the 28,921 agency pages, with the run-rate, window and lifetime pace beside them so the figure can be checked; the weights are in methodology, section 3.