By Min Zeng 
 

Pimco's Total Return Fund, the world's largest bond fund, cut U.S. government-related debt holdings at the end of September amid an abrupt departure of the fund's famed manager, Bill Gross.

U.S. government-related holdings accounted for 38% of the $201.6 billion bond fund at the end of last month, compared with 41% at the end of August, according to data available late Thursday on Pacific Investment Management Co.'s website.

The Pimco fund's U.S. government-related holdings include Treasury bonds, Treasury inflation-protected securities, Treasury futures and derivatives linked to U.S. government debt securities.

The fund's holdings of mortgage-backed bonds was 20%, unchanged from August. Emerging-market holdings ticked up to 10%, from 9% in August. The fund held 53% in cash-equivalent assets.

Mr. Gross surprised the investing world on Sept. 26 when he announced his departure from Pimco, which he co-founded in 1971, following a year of heavy outflows from the Pimco flagship bond fund and a fight with his former chief executive and heir apparent.

Investors are keeping a close eye on the asset allocation because any significant changes could affect prices of some financial assets given the fund's massive size. One worry following Mr. Gross's exit has been whether Pimco needs to sell holdings to meet cash outflows from clients.

Investors withdrew a net $23.5 billion from the Pimco Total Return Fund last month.

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