John North, the vice president of finance for Ashland-based Lithia Motors, said the auto retailer would see almost all its profits from Oregon stores wiped out under a tax measure headed toward the November 2016 ballot.

"That's not really sustainable," said North, adding that Lithia, one of the state's three Fortune 500 companies, might reduce its presence in Oregon if the measure passes.

"Everything is on the table," he said.  "We may have to change our headquarters."