Vanguard has rolled out seven new bond index funds, Business Wire reports. The ETFs, which boosts Vanguard’s bond index family to 12, will offer Signal shares with an expense ratio of about 0.15% and Institutional shares with an expense ratio of 0.09%.

The funds will be benchmarked against Barclays Capital indices. Vanguard Fixed Income Group will oversee the new bond index funds.

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