Looks like it's about to hit the fan.
Kennedy Jr., who is part of a political dynasty with an a former president uncle and a father as a former attorney general, is an outspoken opponent of Big Pharma.
The Health Secretary nominee has at times attributed America's health problems to insufficient regulation of pesticides, harmful additives, seed oils, processed foods and vaccines.
Moderna stock dropped by 5.62 percent in one day when the markets closed on Wednesday, at a price of $39.77, down from $42.14 the previous day.
When the markets opened on Thursday, the price had dropped even lower—to $38.47.
There was also a drop in the price of Pfizer stocks, which decreased by 2.62 percent by the end of Wednesday, closing at a price of $26.02, slightly down from $26.72 the previous day.
Pfizer stocks continued to drop on Thursday, hitting a price of around $24.75 in the morning.
Following President-elect Donald Trump's announcement on Wednesday that he was nominating Kennedy Jr. to head the health department, five major pharmaceutical companies that manufacture vaccines saw a drop in stock market valuation.