They no longer operate out of Hong Kong -- it's just a mailing address for their attorney at this point.  Previously, when they did, the name of the company with the Bitfinex licensing in HK was "Renrenbee Limited."

That said, their holding company and major incorporated interests are registered in the British Virgin Islands as offshore companies, their servers are hosted by a datacenter in Italy, and their back office functions moved to Taipei, Taiwan earlier this year.  Their primary bank relationship is in Taiwan, as well (CATHAY UNITED BANK).

You can't simply "call Hong Kong Police hrrr derrrr" to figure this one out. It's a little more complicated than that.