Sourdough Starter Jar Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

WECK is the best-performing sourdough starter jar brand in July 2026, moving 10,000 units across 2 ASINs for 22.7% of Top 10 volume. GLATABAM follows with 7,000 units (15.9%), ahead of INOBYO on 5,000 units (11.4%).

Volume is spread across 9 brands, with the top three holding 50.0% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $9.99 to $20.98, 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. Specifically, 2 ASINs forced its way in: B01EIJ0P6W booked 4K units at $19.94, with ▲ 7900.0% MoM change. On the growth side, B0DBYSMFHR leads positive momentum with ▲ 133.3% MoM growth on 700 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.