Valve, the company of Gabe Newell, is not traded on the stock exchange, and therefore its financial statements are always a secret. But the approximate order of the numbers can always be calculated thanks to the SteamSpy service, which tracks sales in the digital store Steam. According to his data, in 2017 the site raised $ 4.3 billion. And this is not a complete picture.
SteamSpy can not calculate the number of DLC sold to games and microtransactions, which are carried out through the trading platform with virtual items. And this is another significant article of online store revenue.
Last year, the revenue of Steam was estimated at $ 3.5 billion.
2017 was the best year for Valve so far: Steam's share of the market grew to $4.3B, not counting in-apps and DLCs.
— Steam Spy 📈 GDC (@Steam_Spy) March 22, 2018
In addition, it is not entirely clear how Steam calculates with developers and how much revenue goes to the immediate creators of the games. After deducting these costs, Steam may have only a third of the above amount.