The US Attorney's Office (USAO) has ended a five-year investigation into Lloyd's without bringing charges.
The inquiry related to US Names' allegations that Lloyd's had committed a criminal offence by sending fraudulent material through the US postal service. The Names claimed the 300-year-old market's annual reports were misleading and encouraged them to participate in Lloyd's during the late 1970s and throughout the 1980s when it nearly collapsed due to asbestos claims.
Last year, the investigation was widened to introduce further claims that a payment had been made to the Californian Department of Insurance.
It was alleged Lloyd's paid $400,000 (£284,000) to the department headed by commissioner Chuck Quackenbush. The money was reportedly to defend the way the Reconstruction and Renewal settlement of 1996 would operate.
But Lloyd's claimed the payment was related to regulatory expenses and "for work to monitor Lloyd's and gain a greater understanding of its complex financial structure".
In a market announcement, Lloyd's said the southern district of New York USAO had "closed its investigation".
It added: "It has terminated all proceedings without any charges having been brought. Lloyd's is delighted."
UK Names have vowed to continue legal action against Lloyd's. In March, the United Names Organisation (UNO), which represents 250 individuals, will appeal against the Jaffray ruling.
In his judgment last November, Mr Justice Cresswell said there had been no misrepresentation by Lloyd's.
