Private equity firm Silver Lake has agreed to a $400 million investment in Unity Technologies, said John Riccitiello, chief executive officer of the gaming software maker. The investment values the San Francisco-based company, which makes development tools for video-game creators, at $2.6 billion, according to a person with knowledge of the transaction. Regulators still need to approve the deal, Riccitiello said. The financing follows on the heels of the company’s last round, closed just 10 months ago, in which the company had raised $181 million from investors led by DFJ Growth. Other of Unity’s earlier investors include China Investment Corporation, FreeS Fund, Thrive Capital, WestSummit Capital, serial entrepreneur Max
