Citi analyst Tyler Radke downgraded Teradata to Sell from Neutral and lowered his price target for the shares to $36 from $42. The shares are up over 20% since the company preannounced a strong Q4, but the quarter benefitted from one-offs, Radke tells investors in a research note. Sales responded to favorable incentives that go away, and customers were pre-buying ahead of 2019 pricing hikes, contends the analyst. He sees a "tougher set-up" for Teradata in 2019 as the company rolls out a new product and pricing strategy "into a somewhat skeptical customer base."