It claims the three most secretive sectors in the FTSE are mining, oil and gas and travel and leisure.
The three least secretive are real estate, retailers and utilities.
The 48-page report can be accessed via the Christian Aid website.
Mining is most secretive FTSE 100 sector, claims Christian Aid report
News in Brief
Anti-poverty charity Christian Aid has released a report on the "culture of concealment throughout the FTSE index", which ranks different industries according to the level of secrecy evident in their financial reporting.