Thanks to them, but thanks to the buyers also. Without them, those sell orders wouldn't have been filled. And thanks to the hodlers as well; while the sellers are making their move, the hodlers remain steadfast and therefore prevented the market to get flooded with a higher supply.
In other words, thanks to us all. This bull run and price rally is happening because each of us made a contribution. As a matter of fact, thanks to the naysayers as well the conviction of supporters are always kept strong.