Yes, it is tightly held. On the website the Top 20 dated 15/5/18 shows 66% shares held by Top20.
There are probably more large holders below the Top20, but let's assume there aren't. -
There are approx 425m shares. That would mean the Top20 own approx 281m & the PIs would own the rest - 34% or 144 million. And that 144m is spread over ASX & AIM !!
RMP Price at posting:
5.8¢ Sentiment: Buy Disclosure: Held