Prada, Starbucks and Kraft Heinz are among companies criticised for a lack of transparency on human rights in their businesses and supply chains, despite pressure from governments and an investor-backed group.

Forty percent of companies fail to show any evidence of how they identify and address human rights issues, according to the Corporate Human Rights Benchmark, a not-for-profit group based in London. The CHRB released its second annual ranking of 101 global companies today.

The body is backed by asset managers including Aviva Investors, APG and Nordea, as well as the Swiss, Dutch and British governments, and uses the UN guiding principles on business and human rights...

Those that performed well in the ranking included miner Rio Tinto, Marks and Spencer, the UK retailer, and consumer goods giant Unilever, with scores of at least 65 per cent. Adidas was top performer with 87 per cent...