While Bitcoin was going sideways $8k-$10k in May, some altcoins showed significant profitability for the same 30 days.

Xensor showed the outstanding performance with a 615,8% gain.
XinFin and Theta Fuel also have demonstrated an impressive about 400% gain for the 30d period.

Bancor and Zilliqa increased almost 2 times last month.
Other coins (Electroneum, Solve, Polymath, OmiseGO, Theta Token) managed to provide profitability in range 140%-113%.

Coins less than $10M cap and $1M 24h volume excluded.

Gainers of the month watchlist  https://cryptorank.io/watchlist/24836b846a5a

Stay tuned in our Telegram channel and Twitter