The paper provides early evidence on the informativeness of commodity price risk measures required by the Securities and Exchange Commission's new market risk disclosure rules (SEC 1997). I use existing disclosures of oil and gas producers (O&G) to obtain proxies for the tabular and sensitivity analysis disclosures required by the new SEC rules. I find that proxies for the tabular and the sensitivity analysis format are significantly associated with O&G firms' stock return sensitivities to oil and gas price movements. This finding casts doubt on claims that the new market risk disclosures do not reflect firms' risk exposures. The proxies for the tabular format and sensitivity format disclosures are not substitutable explanations of firms' risk exposures. This evidence suggests that disclosures from one disclosure format are not comparable to those from the other reporting format.