As noted above, the most recent data for TMall puts A2 as ranked 2nd in the Infant Formula category. Now here's some data for the other two main platforms, JD.com and Douyin (Chinese TikTok).
JD.com
For JD.com, the top 10 brands are ranked for the entire Mother & Baby category - so this includes formula alongside other sub categories like nappies, bottles etc. A2 is ranked 5th overall and is the 3rd highest ranked formula brand. The period is 31 Oct - 3 Nov but apparently also includes pre-sales. Tagging @jossette as I know you were looking for JD data.
Douyin
Douyin is just Chinese version of TIkTok and has rapidly gained market share in the past two years for the 11.11 event.
The Top 30 brands across the following categories are ranked together: milk powder/complementary food/nutritional products/snack brands. A2 is ranked 4th overall for sales from 24 Oct - 8 Nov.
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