The Vanguard Group said on Monday that its Quantitative Equity Group will manage a portion of the $6.1 billion Vanguard Energy Fund, which has been managed exclusively by parent company Wellington Management since its inception in 1984.

Vanguard, the nation's second-largest mutual fund complex, will provide fund management services to the fund on an at-cost basis. The estimated expense ratio of the fund's share classes - 0.33% for Investor shares, 0.27% for Admiral shares - is not expected to change materially with the addition of the new manager, company officials said.

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