Iowa-based auction marketing and equipment pricing company Tractor Zoom has raised $3 million to scale its pricing and analytics platform Iron Comps, the company announced this week. Investors Innova Memphis, Hyde Park Angels, Iowa Corn Opportunities, ISA Ventures, Ag Ventures Alliance, Ag Startup Engine and several angel investors took part. Tractor Zoom has partnered with more than 450 auction companies since November 2017 to market farm equipment auctions to an audience of more than 225,000 equipment buyers in the U.S., Tractor Zoom said. The company currently has 12 full-time employees and four open positions available for hire in software engineering, marketing and customer success.