Customized T Shirts Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Modify by Amazon Merch on Demand is the best-performing customized t shirts brand in July 2026, moving 12,000 units across 2 ASINs for 67.8% of Top 10 volume. Gildan follows with 2,500 units (14.1%), ahead of INTO THE AM on 1,000 units (5.6%).

With 7 brands splitting the Top 10 and 87.6% 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 $11.19 to $27.95, 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: B07611ZQC7 booked 500 units at $12.21, with ▲ 0.0% MoM change. On the growth side, B0GXK62CSJ leads positive momentum with ▲ 300.0% MoM growth on 400 units, with B0C5J9VWK3 close behind at ▲ 300.0% 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.