Gain Powder Laundry Detergent Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Arm & Hammer is the best-performing gain powder laundry detergent brand in July 2026, moving 120,000 units across 2 ASINs for 19.0% of Top 10 volume. Downy follows with 120,000 units (19.0%), ahead of SHOUT on 100,000 units (15.9%).

Volume is spread across 8 brands, with the top three holding 54.0% 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 $3.48 to $14.47, 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: B0GSPD9FZ6 booked 50K units at $14.37, with ▲ 66.7% MoM change. On the growth side, B0FG58W4KG leads positive momentum with ▲ 100.0% MoM growth on 40K units, with B0DT4T9DHN close behind at ▲ 100.0% MoM on 4K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.