Baby Shark Birthday Decorations Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

K.E.J. is the best-performing baby shark birthday decorations brand in July 2026, moving 12,000 units across 2 ASINs for 24.5% of Top 10 volume. BOMSI follows with 9,000 units (18.4%), ahead of GREATRIL on 8,000 units (16.3%).

Volume is spread across 9 brands, with the top three holding 59.2% 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 $5.37 to $12.67, 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. On the growth side, B0GTMGSBDF leads positive momentum with ▲ 300.0% MoM growth on 400 units, with B0GDFXYJ2T 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.