Boston—Private equity firm ABRY Partners and Sundance Business Enterprises, a wholly owned subsidiary formed by David Nussbaum, former CEO of Penton Media, announced on Monday that they plan to identify and invest in b-to-b media companies and vertically focused online companies. ABRY has committed $100 million of equity capital to the venture, which it said should drive at least a half-billion dollars in transactional value. “This newly formed partnership was a natural transition as we translate ABRY’s experience and knowledge, and couple that with my own 25-year experience in vertical markets, the media industry and the e-media world,” Nussbaum said in a news release. Nussbaum’s move comes less than a month after b-to-b media veteran Jim Casella aligned with private equity firm Austin Ventures to form Case Interactive Media. Like Sundance, CIM will focus on acquiring and operating b-to-b media properties.