Congrats to David Beisel, Rob Go, and Lee Hower of NextView Ventures, the Boston-based seed stage venture fund that today announced it had closed its inaugural $21 million fund. If you thought the fund was already closed, that’s because they already have a portfolio of 15 companies. (They held an initial close last March and wrapped up the remaining commitments at the end of 2011.)

NextView is focused on early-stage internet companies, both consumer and B2B, and looks to invest $250-$500k. The fund already has its first exit in Hyperpublic, which was acquired by Groupon just days ago.

Hower has a blog post up about the full story behind the fundraising, which is worth a read. Writes Hower:

As one of our mentors is fond of saying, being a VC is easy… all you have to do is raise a fund and invest it successfully.  Neither are easy, but Rob, David, and I are excited to be done with the first part and can focus our energies on creating a successful first fund and building an enduring firm around our strategy and ethos.

Fortune’s Dan Primack broke the news this morning, adding:

What Boston continues to lack, however, are micro-VC firms. We’ve got plenty of established venture firms and a burgeoning angel phenomenon, but few new institutional groups focused exclusively on seed-stage companies.

We’re excited about the role of NextView – a BostInno Channel partner – in the Boston ecosystem. Back in late 2010, we went so far as to wonder whether Rob Go could be Boston’s Fred Wilson.

An exit before the first fund closes isn’t a bad start.