Cloudera Inc. CLDR, +4.76% shares are down 31% in premarket trading Wednesday after the company delivered a weak forecast the prior afternoon and saw its stock downgraded by at least two analysts, according to FactSet. J.P. Morgan analyst Mark Murphy cut his rating to neutral from overweight due to the uncertainty around Cloudera's trimmed outlook for fiscal 2019. "We are moving to a Neutral rating as we believe the changes Cloudera plans to implement in its go-to-market approach will take some time to bear fruit, while the slowdown in its Expansion bookings will impact the narrative against a backdrop of solid recent results from software peers including MuleSoft MULE, +0.64% and Red Hat RHT, +1.68% " Murphy wrote. He said that the company believes sales execution is a problem, rather than competitive or technological pressures. Analysts at Deutsche Bank also downgraded Cloudera shares to hold, according to FactSet. Shares were up 35% in 2018 as of Tuesday's close, while the S&P 500 SPX, +1.26% had lost 2.2%.