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

Modify by Amazon Merch on Demand is the best-performing custom t shirt brand in July 2026, moving 12,000 units across 2 ASINs for 78.9% of Top 10 volume. CARPESUN follows with 900 units (5.9%), ahead of Mit & Mia on 800 units (5.3%).

With 7 brands splitting the Top 10 and 90.1% 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 $4.99 to $16.99, 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: B0GXK62CSJ booked 400 units at $6.99, with ▲ 300.0% MoM change. On the growth side, B0C5J9VWK3 leads positive momentum with ▲ 300.0% MoM growth on 200 units, with B0F53C67QW close behind at ▲ 100.0% MoM on 200 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.