Other requests by the investors included scaling up low-carbon energy systems; implementing carbon pricing mechanisms that rise over time; establishing new or more ambitious plans to end deforestation. In all, 532 investors signed the latest iteration including UBS Asset Management (UBSG.S), Amundi SA (AMUN.PA) and Federated Hermes. However, none of the top three U.S. index fund managers BlackRock (BLK.N), Vanguard and State Street Corp (STT.N) signed onto this letter. The reticence comes as the process of investing with an eye on environmental, social and governance-related issues, or ESG, faces growing pressure in the United States. read more Representatives for BlackRock declined comment, while Vanguard did not respond to queries. A representative for State Street, whose asset-management arm signed an Investor Alliance statement last year, declined to comment.