According to its website:
“How many yeast cells are in your homebrew packs?
Through our proprietary process, we generate the optimal number of yeast cells, which varies from strain from strain, to yield the best and most consistent performance for each.
As a result of genetic differences, we have observed strain to strain variation in cell counts even under identical growth conditions. Certain strains may contain up to 500 billion cells per pack while other strains may contain slightly less than 150 billion cells per pack.
Most importantly, all packs contain the optimal number of viable yeast cells to ferment 5 gallons of wort up to 1.060 OG at the time of packaging.
The number of cells in the pack do not define the success of the brew.”
I brew low ABV beers, so the liquid yeast, if fresh, usually doesn’t require a starter, but that’s because an ABV beer of under 4% or so will be generally well served by the yeast package as they sell it. YMMV, of course.