Litigation funders have responded forcefully to a group of in-house lawyers who are asking for more fulsome disclosures of third-party funding in federal litigation.

A group of 30 current and former top lawyers at major companies including Google, Verizon Wireless and AT&T Inc. signed onto a letter last month backing a proposed amendment to Federal Rules of Civil Procedure 26(a)(1)(A) that would require the full disclosure of third-party funding agreements in civil actions.