** Shares of CK Hutchison 0001.HK rise 4.3% to HK$63.35, their highest level since March 3
** Stock set for the biggest one-day pct gain since February 26; top pct gainer in Hang Seng Composite Index on conglomerates .HSCIC
** Hong Kong-based conglomerate's Panama unit has launched an arbitration against Maersk MAERSKb.CO after the takeover of two strategic ports near the Panama Canal, which are at the center of a legal battle that has embroiled Beijing and Washington
** In a statement, the Panama unit said Maersk broke a long-term contract by siding with the Panamanian government to help remove PPC from its operations at the Balboa port and replace it with a Maersk-affiliated operator
** Neither Maersk nor the Panamanian government immediately responded to requests for comment
** YTD, stock up 19.2%, Hang Seng Index .HSI up 0.4%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))