Shenzhen Oumo Technology Co., Ltd. is a China manufacturer of optical devices and modules, and a A-share listed company with the stock code of 002456. By definition, large-cap stocks usually refer to company stocks with large market value and wide market attention. As Shenzhen Eurofilm Technology Co., Ltd. is a A-share listed company with a certain market value and popularity, it can be considered as one of the large-cap stocks.