Slim Fast Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Premier Protein is the best-performing slim fast brand in July 2026, moving 100,000 units across 2 ASINs for 54.3% of Top 10 volume. Atkins follows with 40,000 units (21.7%), ahead of SlimFast on 12,000 units (6.5%).

With 7 brands splitting the Top 10 and 82.6% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $11.28 to $27.98, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. On the growth side, B0015068TG leads positive momentum with ▲ 100.0% MoM growth on 20K units, with B001G8Y9JI close behind at ▲ 100.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.