Khosla Ventures has held a final close on its Khosla Ventures IV fund at $1.05 billion. The fund will target early stage investments in clean tech, IT, mobile and internet technology. Khosla's previous fundraising effort was split between a $1 billion Khosla Ventures III fund and a $300 million Khosla Ventures seed fund. Recent Khosla investments include Lookout Mobile Security, RingCentral and Danotek Motion Technologies.