** Cyren's U.S.-listed shares CYRN.O jump ~23 pct
premarket in heavy volumes, set to erase YTD losses of 7.6 pct
** Stock is the 5th biggest gainer premarket, with vols of
~58k shares already 6.5x their 25-day moving avg
** The Israeli software services provider signs https://bit.ly/2GWcgMa
a multi-year contract with a tech company, which it did not
name
** Cyren said the tech firm will become its largest customer
by revenue and the deal will add to rev starting from Q2
(Reporting by Shreyashi Sanyal in Bengaluru)
((RM: Shreyashi.Sanyal.thomsonreuters.com@reuters.net))