According to the Map of E-commerce in Vietnam announced by iPrice (e-commerce portal at 7 ASEAN’s markets); 3 e-commerce corporations with highest website visits in Vietnam are Lazada, Thế Giới Di Động and Sendo. 
As statistic in the period of April, 2017 and June, 2017, three most-visited online shopping sites in Vietnam are Lazada, Thế Giới Di Động and Sendo with 41,1 bn visits, 32,3 bn visits and 4,4 bn visits, respectively.

Part of the map released by iPrice

The study comments, three top enterprises are all backed by big companies. When "giant" Alibaba owns 83 percent of stakes in Lazada, the two other companies have advantage of long-standing retail operation in Vietnam. Thế Giới Di Động spreads the storechain to all over the country while Sendo belongs to Vietnam powerful corporation FPT.In an online shopping survey conducted by the Vietnam E-commerce and Information Technology Agency in 2014, there were shown to be some 220 domestic etailers in the country, with a collective revenue of US$70 million. Among these, lazada.vn ranked first in terms of revenue, accounting for around 36% of the total. This was followed by sendo.vn, zalora.vn, tiki.vn and ebay.vn.
With development speed of 22 percent/year, Vietnam e-commerce market is attractive cake to enterprises. However, the more attractive it is, the fiercer this market becomes with flux of big retailor and foreign enterprise.
According to iPrice, the map ranking 50 e-commerce enterprises based on criterions: Monthly Visits (Average monthly website visits between the period of April 2017 - June 2017); App Installs (Minimum number of App installs as-per Google Play install brackets)via  Google Play Store and Total worldwide downloads Social Media Followers via Facebook, Twitter, Instagram and Combined total of Facebook fans from all operating countries.
E-commerce who received more than 100,000 visitors per-month or 100,000 social media followers are qualified for this list. The following industries were not included in this list: e-ticketing, financial services, rental services, insurance, delivery service, food & beverage, meta-search, couponing and cashback websites. All mentioned in this list was founded by individuals and was initiated in the e-commerce sector.
Outstandingly, eight out of ten most-visited e-commerce websites belong to Vietnam’s domestic companies. Many of them are popular with Vietnamese consumers such as Thế Giới Di Động, Sendo, Tiki, Vật Giá, FPT Shop, Điện Máy Xanh, A Đây Rồi, Nguyễn Kim. Only two foreign ones among the top ten are Lazada and Shopee with numerous branches in other South East countries.
Besides, the enterprises having most efficient Youtube channels, according to iPrice are
CellphoneS, Thế Giới Di Động and Điện Máy Xanh. In this criterion,  Lazada is lowered to the 9^th position. With growth of Youtube in 2016 reaches 120 percent, IT companies seem to do better in acknowledge the consuming trend. At the early 2016, ad commercial clip of Điện Máy Xanh is among the most watched list in Asia, voted by Campaign Asia.
According to Nikkei Asia, the Vietnamese e-commerce market is expected to soar 150% to $10 billion by 2022, thanks to broader adoption of smartphones and growing use of Facebook as an online marketplace.
The market stands at $4 billion -- or 30 times smaller than Japan's -- but has been expanding around 20% per year. The growth estimate comes from the Vietnam E-commerce Association. Annual Vietnamese e-commerce spending per capita rose 22% to about $160 last year, with many shopping for big-ticket items such as appliances and imported clothing. Though distribution had been an issue, Uber-style smartphone apps have emerged that let customers pick a company to deliver their purchases. Shipping networks have improved as well.