Is Senxun a brand owned by Xiaomi?

No, according to official website of Shanghai Senxun Technology Co., Ltd., Senxun is the brand of Shanghai Senxun Technology Co., Ltd., not the brand of Xiaomi. Senxun opened the official flagship store-Senxun flagship store online, so that the majority of netizens can also buy the same goods as Senxun's physical store online.