Greylock Partners announced in a blog post that it has raised $1 billion for its 15th early-stage fund. The firm, which has backed the recently exited Apptio, Pure Storage, Quip and TellApart, raised virtually the same amount for its previous fund in 2013. U.S.-based venture funds have raised more than $33 billion in commitments through the first three quarters of the year, according to Thomson Reuters and Greylock’s is the seventh venture fund to close at $1 billion or more in 2016.