The world's largest asset manager, Blackrock, Inc., noted in a comment letter to the US Department of Labor regarding pension fund regulation that, as ESG data has become more accessible, the firm has developed a better understanding of financially relevant ESG information, and ESG funds that incorporate financially relevant ESG data have become more common. BlackRock stated that its systems for ESG analysis have access to more than 2,000 categories of ESG metrics from various ESG data providers. The firm concluded that, because of the greater volume of ESG-related disclosures by companies and third party ESG vendors, together with advancements in technology, "the use of ESG data to seek enhanced investment returns and/or mitigate investment risks has become more sophisticated."