By Erin Ailworth 

Aubrey McClendon appears to have lost some support from his biggest financier over allegations that he started American Energy Partners LP using trade secrets taken shortly before his forced departure from Chesapeake Energy Corp. in 2013.

In a lawsuit filed in mid-February, Chesapeake accused Mr. McClendon--its founder and former chief executive--of making off with confidential data and maps of oil and gas prospects that he then used to buy up drilling rights on acreage Chesapeake had hoped to acquire.

The Energy & Minerals Group, an investment firm headed by John Raymond that has put billions of dollars into American Energy, initially defended Mr. McClendon, calling Chesapeake's suit meritless.

But on Tuesday, an affiliate of American Energy controlled by EMG said it had agreed to assign approximately 6,000 acres in Ohio to Chesapeake, along with a combination of cash and payments up to $25 million. In exchange, the affiliate, American Energy-Utica LLC--in which EMG is the largest equity investor--and 20 unnamed investors are being dropped from Chesapeake's lawsuit, according to a statement from EMG and American Energy-Utica.

Mr. McClendon is no longer an officer of American Energy-Utica, the statement said.

Mr. Raymond and Energy & Minerals had no immediate comment.

In response, Mr. McClendon said he has the right to possess the disputed data. American Energy-Utica. "apparently chose to settle with Chesapeake before any discovery was taken, evidently for the business purpose of mitigating further damage that Chesapeake's litigation has been having on AEU's business and financing activities," he said in a statement. "This resolution should not be mistaken as reflecting an informed view of the merits of Chesapeake's claims or a concession of any liability by any party to Chesapeake."

Mr. McClendon said that he remains a director of American Energy-Utica's parent company and an officer of many of its other affiliates.

Write to Erin Ailworth at Erin.Ailworth@wsj.com

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