Maybe because of very low supply so investors interested to invest but I doubt of this massive pumped, it seems to me manipulation you know the supply is low it can easy to manipulate it. This is high risk if you join the ride it reaches the highest peak we never know when will be a massive dump.
Having a low supply of coins does not necessarily mean that they could attract the investors and the price keeps on moving higher, if i remember correctly the yearn. finance had a minor correction last week and the entire market went down with it and as an investor i will not dare to invest in a coin that rallied this much.