Zynga, a US-based social gaming company formerly known as Presidio Meida, is reportedly planning to raise up to $500m at about a $10bn valuation. Mutual fund managers T Rowe Price and Fidelity are among the reported potential investors.
According to its regulatory filing, Zynga last raised $6.4m in October from three undisclosed investors.
In June, Japan-based media and communications conglomerate SoftBank Corporation invested about $147.4m in Zynga, while search engine group Google is also reported to be an investor.
Zynga had previously raised $240m from venture capital firms Digital Sky Technologies, Andreessen Horowitz, Tiger Global, Institutional Venture Partners, Kleiner Perkins Caufield & Byers, Union Square Ventures, Foundry Group and Avalon Ventures, according to news provider PEHub.com.