need: The three judges 'heard' the case.
When an appeal is filed, both sides present their case in written format. RA/Gunderson laid out their reasons why the lower court ruled erroneously, and the SEC laid out their reasons why the lower court ruled correctly. The judges read those reasons, as well as all relevant court documents, and come up with an opinion.
They came up with a unanimous opinion that upheld the lower court ruling. Had there been a dissenting opinion, that opinion would have been included in their final ruling.
RA/Gunderson could try to file an appeal with the US Supreme Court, but I doubt they will, and I know there's no chance it would get heard.
