California’s Franchise Tax Board won the appeal of Gillette v. Franchise Tax Board. This opinion covers taxation of multi-state entities in California prior to 2012.
Gillette (and several other companies) argued that the FTB’s weighing of the “sales” factor higher than other factors was discriminatory based on a multi-state compact. (California specifically withdrew from the compact for years after 2011.) The California Supreme Court decided that the FTB’s interpretation of the California legislature is accurate.
Gillette and the other appellants can file a writ of certiorari to the US Supreme Court; however, this does not appear to be the kind of case that the US Supreme Court would take.