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Splunk forecasts current-quarter revenue below estimates, shares fall

May 21 (Reuters) - Data analytics software maker Splunk Inc reported a bigger quarterly loss on Thursday, hit by higher costs, and forecast current-quarter revenue below estimates, sending its shares down 5%.

The company said it expects second-quarter revenue to be about $520 million, below analysts' estimates of $548.5 million, according to IBES data from Refinitiv.

Net loss widened to $305.6 million, or $1.94 per share, in the first quarter ended April 30, from $155.4 million, or $1.04 per share, a year earlier.

Splunk also said it expects adjusted operating margin to fall between 10% and 15% in the second quarter.

(Reporting by C Nivedita in Bengaluru; Editing by Krishna Chandra Eluri)