Source: Insight Venture Partners Is The New Twitter Investor

We’ve been talking to sources all day about that new $1 billion valuation Twitter financing, and more information is coming in. The big missing part of the story was who was actually doing the investing at that massive valuation.

The primary investor in the deal, we’ve heard from a source with knowledge of the transaction, is New York-based Insight Venture Partners, which has raised over $3 billion since being founded in 1995. They were (or rather their founders were) early investors in Photobucket, which was acquired by News Corp./MySpace in 2007 for around $250 million.

What’s not clear is if Twitter is capping the round at $50 million. One source says they may raise more. With that valuation, who’d blame them? Not me.