LONDON—Mark Lyttleton, a former BlackRock Inc. fund manager, pleaded guilty to two counts of insider trading Wednesday, admitting using information from his job to make personal trades.

Mr. Lyttleton, an equities fund manager at BlackRock for more than a decade, was charged for trades involving two stocks, EnCore Oil PLC and Cairn Energy PLC, in 2011.

EnCore Oil was being acquired by another oil company at the time, while Cairn Energy was selling a stake in its Indian unit.

"In his role in the fundamental equity team at BlackRock, Mr. Lyttleton was able to discover and act on inside information either by working on the deals concerning the stocks or being party to conversations conducted by colleagues," the Financial Conduct Authority—the U.K. regulator prosecuting the case—said in a statement.

The FCA said the trades were made through an overseas asset manager trading on behalf of a company registered in Panama. It previously said that Swiss authorities carried out searches in Switzerland in relation to the case.

A lawyer for Mr. Lyttleton didn't immediately return calls.

Mr. Lyttleton, 45 years old, was arrested along with his wife in April 2013, a month after resigning from BlackRock.

BlackRock isn't part of the investigation and its clients weren't involved, the asset-management company said previously.

No charges were brought against Mr. Lyttleton's wife.

Mr. Lyttleton will be sentenced on Dec. 21. Insider trading carries a sentence of up to seven years in prison in the U.K.

Mr. Lyttleton managed as much as $4 billion for BlackRock clients before his arrest. After leaving the fund group, he became a life coach and mentor, according to his LinkedIn page. On the page, he said being arrested was the low point of his life and that he now wanted to help people "be the best versions of themselves."

Write to Margot Patrick at margot.patrick@wsj.com

(END) Dow Jones Newswires

November 02, 2016 08:45 ET (12:45 GMT)

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