Vanguard, the world's largest provider of mutual funds, is pushing companies to disclose the risks climate change poses to their business. Vanguard is a top shareholder in many large US corporations, so it can impact how companies are run at high levels. It's a sign that investors are taking climate risks seriously. The world's largest mutual fund provider is pushing companies to disclose the risks climate change will pose to their business. Vanguard, which is also the second largest provider of exchange-traded funds, manages trillions of dollars.