They invested 5000 ETH when ETH = ~$10 USD
I'm not sure if they closed the entire position or not. The statement doesn't clarify that. Maybe I'm wrong - somebody care to elaborate?
Iconomi sold 1/3 of their Golem tokens for ROI+ 1000 eth profit.
Golem ico price was 0.001 ETH/GNT and they put 5000 ETH in (ETH was about $10.25 at time of Golem ico)
Sold 1/3 for 6000 ETH at the peak ETH price:
5M GNT × (1/3) = 1.67M GNT
6000 ETH ÷ 1.67M GNT = 0.0036 ETH/GNT
Current price of GNT:
0.00161 ETH/GNT
Of course, we wait for financial report and cryptographic proof of reserves to verify these moves.