I reckon intra-day high of $2.05 in March 2008 would probably be it - at approx 158m shares on issue (diluted for 3m of convertible notes), would have put market cap in the region of $324m.
However, at the time, the value was perceived to be in the future production of Southern Bluefin Tuna, so I don't think that sort of market cap is likely on the back of Kingfish alone.
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