While Zaks and other Moderna officials have already been cashing out on shares for the past few months, they've increased the sales of shares since reports were published on a successful test of the vaccine earlier in July.
In general, when stakeholders believe in their product, they increase their shares in order to increase confidence in the market. The move by Moderna officials to do the opposite raised concerns about the company, especially considering that Zaks, who sold almost all of his shares, is on the scientific side of the company, according to Globes.
Zaks still has tens of thousands of dollars worth of options in the company.
CEO Stéphane Bancel has also cashed out on shares in recent months.
Share sales by CEO Stéphane Bancel, his children's’ trust and companies he owns amount to about $21 million between January 1 and June 26.
Seven executive-compensation experts told Reuters that share liquidations by Moderna executives show the incentives biotech executives have to highlight development milestones, even for drugs that often don't get approved or sold. Such optimistic statements could cause investors to overpay for company shares or create false hope concerning a possible coronavirus vaccine.
“This may be their one shot at making a boatload of money if the vaccine doesn’t work out,” said Jesse Fried, a Harvard Law School professor who wrote a book about executive compensation, adding that Moderna’s chiefs have a powerful motivation to “keep the stock price up.”
Reuters has not found evidence that Bancel, Zaks or Moderna have exaggerated the company’s vaccine progress.Uncertainty remains concerning how effective a vaccine will be in fighting the coronavirus, as it is still unclear how long one can remain immune to the virus.
Moderna launched a 30,000-subject trial of a COVID-19 vaccine that could clear the way for regulatory approval and widespread use by the end of this year, the company said last week.
The trial is one of the first late-stage studies supported by the Trump administration's effort to speed development of measures against the novel coronavirus, adding to hope that an effective vaccine will help end the pandemic.Reuters contributed to this report.