(Bloomberg) -- The plunge in oil prices has claimed another prominent victim.

Bill Gross’s $1.46 billion Janus Global Unconstrained Bond Fund trailed its benchmark in the fourth quarter of last year primarily because it had plowed about 5% of net assets into debt issued by U.S., Russian and Brazilian energy companies, according to a quarterly overview published on the Denver-based firm’s website. Those bonds and emerging market sovereign debt that Gross agreed to insure were all hit by the 42% collapse in crude prices during the period.

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