Unreal Engine provider and Fortnite developer Epic Games has been valued at $17.3 billion.
The updated post-money equity valuation comes after the close of a successful funding round, which has seen a further $1.78 billion poured into the company.
Epic was worth an estimated $8 billion just two years ago in the wake of Fortnite's early success.
The round was a mix of primary capital and secondary purchases from employee equity holders, and includes the recently announced $250 million strategic investment from Sony Corporation.
Fortnite firm raised $1.78 billion, including Sony's $250 million investment
In comparison, a "most conservative estimate" of Valve's net worth amounts to over $3bn.