Australia-listed Tuas slides as subscriptions slow, regulatory concerns remain

** Shares of telecom firm Tuas TUA.AX plunge as much as 16.1% to A$1.955, their biggest intraday pct loss since May 20

** Stock drops to lowest level since June 3

** Citi notes subscription momentum slows in second half, with mobile net additions in first half down year over year

** Co posts annual underlying EBITDA of S$83.8 million ($65.74 million), up 22% but 2% below Citi estimates

** Co's regulatory woes in relation to its unit Simba Telecom remain unresolved

** YTD, shares down 72.3%

($1 = 1.2748 Singapore dollars)