(Adds more context, broker comment)

By Rory Gallivan

LONDON--Shares in U.K. mobile payments technology group Monitise PLC (MONI.LN) slumped nearly 30% early Thursday after the U.S. payments company Visa Inc. (V) said it is considering its options over its 5.5% stake in the company.

"Given the maturation of Monitise as a company, Visa is considering its options with respect to the investment," Visa said.

"Visa will also be lessening its dependence on external mobile development resources," it added.

Monitise Chief Executive Alastair Lukies stressed that the two companies still have an ongoing relationship.

"We are honoured to have our ongoing alliance with Visa as we continue to develop and expand our global network," he said.

Ali Farid Khwaja, a technology analyst at the investment bank Berenberg, said Thursday's announcement by Visa is a big setback for Monitise.

"The fact that Visa says that it is now developing the same technology in house raises serious concerns about Monitise's long-term viability," he said.

"Will other customers also gradually develop the same technology in-house and move away from Monitise?" he asked.

Visa's investment in Monitise in 2009 and subsequent collaboration with the company helped Monitise reach a market capitalization of above 1 billion pounds earlier this year. Shares have since progressively slid on the back of two profit warnings and Thursday's announcement.

Visa Europe, a separate company from Visa Inc., owns 6% of Monitise according to the Monitise website.

At 1114 GMT, Monitise shares had recovered a little ground from earlier trading, down 8 pence, or 18%, at 35 pence valuing the company at GBP684.5 million.

-Write to Rory Gallivan at rory.gallivan@wsj.com; Twitter: @RoryGallivan

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