Moderna CEO Stephane Bancel has sold $408 million in company stock since the beginning of the coronavirus pandemic — averaging roughly $3.6 million a week — as the company’s stock soared on the development and rollout of its Covid vaccine, according to CNBC’s analysis of the company’s securities filings.

The Cambridge, Massachusetts, biotech company and its French CEO weren’t widely known outside biotech circles before the pandemic. However, they both became breakthrough success stories as Moderna rapidly developed its two-dose Covid vaccine in cooperation with the National Institutes of Health and with taxpayer backing trough Operation Warp Speed.

Moderna’s shots are now the second-most commonly used Covid vaccine in the U.S. after Pfizer, with more than 209 million doses administered, according to the Centers for Disease Control and Prevention.

Courtney Yu, director of research at Equilar, said the value of Bancel’s sales speak to how well the company’s stock has performed on the success of its vaccine. Equilar, which provides data on executive compensation, independently verified the value of Bancel’s sales.

Moderna’s stock has soared 614% since first announcing on Jan. 23, 2020, that it received funding from the Coalition for Epidemic Preparedness Innovations to develop a coronavirus vaccine. The FDA granted emergency authorization for Moderna’s vaccine in December 2020.