The guy sold only about 1.1% (2 million/176 million) of his position. Still the guy is holding about 99% of his position.
According to Relief board member Tomaz Burckhardt, the seller is Yves Sagot. The co-founder and longtime scientific director sold some of his shares for private reasons. According to the annual report for 2019, he previously owned almost 176 million shares, which corresponds to around 10% of total capital.