BlackRock, the world’s biggest asset manager, replaced portfolio managers at funds including those that invest in energy as it seeks to improve performance at actively run products.

Natural resources funds including the $773 million BlackRock Energy and Resources Portfolio and the $384 million BlackRock All-Cap Energy and Resources Portfolio will now be managed by Robin Batchelor and Poppy Allonby, according to a filing today by the New York-based company with the U.S. Securities and Exchange Commission. The funds were previously managed by Denis Walsh and Daniel Neumann, who took over after former manager Daniel Rice said in June he was stepping down to avoid the appearance of a conflict of interest.

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