Shares of Huami (NYSE: HMI) surged 11% on May 21, after the Chinese wearables maker posted impressive first-quarter numbers. Its revenue rose 77% year over year to 585.9 million renminbi ($93.4 million), as its total shipments rose 50% to 4.8 million.Its gross margin expanded 270 basis points year over year to 25%, while its adjusted net income jumped rose more than ninefold to 92.5 million renminbi ($14.8 million), or 0.39 renminbi ($0.06) per American depositary share.