Private equity funds and platform startups dominated the venture space in April. Ride-hailing unicorn Lyft closed a $600 million funding round, 16 months after its last $1 billion series F led by General Motors. Private equity giant KKR participated in the latest round, along with venture capital firms Baillie Gifford, AllianceBernstein and Graphene Ventures. Private equity funds also led several other top deals of the month. Here is a quick summary of the 10 biggest venture deals closed in April.