Requires disclosure of third-party litigation funding agreements and establishes certain responsibilities for litigation funders.

S 4374 requires parties in civil lawsuits to disclose third-party litigation funding agreements to the court and all parties at the time of filing or when the agreement is made. It defines "litigation funders" as entities providing funding for lawsuit expenses in exchange for a share of proceeds and mandates they act as fiduciaries to the funded party. The bill prohibits funders from influencing case decisions, offering legal advice, or taking more than 25% of settlement proceeds (or 50% total with attorneys without consent), and makes agreements unenforceable if these rules are violated. This directly affects civil lawsuit participants, their attorneys, and third-party funders, while excluding family loans, regular attorney fee agreements, and nonprofit legal aid from disclosure requirements.