A San Francisco-based investment firm has purchased The Snack Factory, which sells snacks under thePretzel Crispsbrand.

VMG Partners, which invests in small companies ranging from $10 to $100 million in annual sales, also owns Roberts American Gourmet, the Sea Cliff, N.Y.-based company that markets and sells snacks under thePirate’s Booty brand, according to its Web site.

ThePretzel Crispsbrand was launched in 2004 by Warren and Sara Wilson and is based in Skillman, N.J. The line is sold to club store, retail grocery and mass merchandiser channels.

Houlihan Lokey, an international investment bank that advised the transaction, made the recent announcement about the sale.