Rxbar Protein Bars Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

KIND is the best-performing rxbar protein bars brand in July 2026, moving 60,000 units across 2 ASINs for 31.6% of Top 10 volume. ALOHA follows with 30,000 units (15.8%), ahead of Quest on 30,000 units (15.8%).

With 9 brands splitting the Top 10 and 63.2% 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 $9.08 to $26.49, 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. Specifically, one ASIN forced its way in: B09PYB4MQS booked 10K units at $32.49, with ▲ 3233.3% MoM change. On the growth side, B0FHMLH6Q9 leads positive momentum with ▲ 100.0% MoM growth on 8K units, with B0F8D58FJM 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.