A pharmaceutical company lost 15 percent of its value, worth $387m, after Senator Bernie Sanders sent a tweet on Friday about it heavily increasing the price of its leukemia drug in a year.

Ariad Pharmaceuticals, which makes the drug Iclusig for the illness leukemia, has raised the price of the drug four times this year.

In 2012, the drug cost $9.580 a month but it now costs $16,560 a month, which represents a 73 percent increase.

Sanders, who has a habit of criticizing the high price of drugs, had tweeted multiple times accusing the drug industry of being "crooks".

But this time, the effect of his tweets about the pharmaceutical industry seemed to be felt immediately. Ariad experienced "the biggest one-day decline in more than a year".