The credit investment arm of private equity company Thomas H. Lee Partners has raised $511 million for its third direct lending fund reportedly aimed at mid-sized private companies in healthcare, financial services and software. The new fund from THL Credit Advisors LLC was oversubscribed and closed above its target, the company said in a statement. The firm's lower middle market direct origination platform offers vertical specialization and synergies with its tradable credit platform and private equity parent.  "The successful close of this fund is an acknowledgement of our experience as a leading, specialized lender in the lower middle market and...