They were denied on the grounds that the lists are trade secrets that may be withheld under Wyoming's open records law.

NPR: Judge Sides With Wyoming In Fracking Chemical Suit

Disclosure could allow competing companies to reverse-engineer fracking fluid formulas, they argued, and Wyoming's open-records law contains an exemption that allows trade secrets to be withheld from the public.

NPR: Judge Sides With Wyoming In Fracking Chemical Suit