Nike Shirt Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Under Armour is the best-performing nike shirt brand in July 2026, moving 3,500 units across 3 ASINs for 41.7% of Top 10 volume. Nike follows with 3,100 units (36.9%), ahead of Carhartt on 1,000 units (11.9%).

With 4 brands splitting the Top 10 and 90.5% 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 $19.99 to $29.08, 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: B07FKCKLHV booked 400 units at $30.00, with ▲ 0.0% MoM change. On the growth side, B07T4V7SBV leads positive momentum with ▲ 200.0% MoM growth on 300 units, with B07FKF9F13 close behind at ▲ 100.0% MoM on 400 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.