Star bond-fund manager Bill Gross will share some of the limelight at the helm of his Janus Capital Group Inc. mutual fund as part of a move aimed at bolstering the firm's bond team.

Denver-based Janus is spending at least $85 million to buy a majority interest in Kapstream Capital Pty Ltd., an Australian-U.S. global bond firm that managed $6.6 billion as of March 31, the firm said.

As part of the deal, Kumar Palghat, a Kapstream founder and former Pimco executive, will join Mr. Gross's Janus Global Unconstrained Bond fund as co-manager of the fund. Both Mr. Gross and Mr. Palghat will report to Janus Chief Executive Officer Dick Weil.

Mr. Gross has suffered from rocky performance and lackluster inflows into his fund since taking over in late September, following his abrupt departure from Pacific Investment Management Co.

Since he began trading on Oct. 6, the fund has lost 0.8% through June 29, compared with a gain of 0.18% for its benchmark, the ICE Libor 3 month USD, according to fund-research firm Morningstar Inc. Mr. Gross's fund is lagging behind 65% of its peers.

So far this year, the Janus Global Unconstrained Bond fund is down 0.312% compared with a gain of 0.13% for the benchmark, lagging behind 80% of peers, Morningstar says.

Mr. Gross's fund has seen about $119 million in net inflows this year through June, according to Morningstar, a fraction of the tens of billions of dollars that have left Pimco since his departure.

"I look forward to working with my old colleague Kumar Palghat and the rest of the Kapstream team as we deliver value for our clients," Mr. Gross said in a news release.

Janus had signaled that it would build out Mr. Gross's team, which he has managed from an office in Newport Beach, Calif., and typically pairs portfolio managers together at its funds.

The Kapstream deal will increase the amount of fixed-income assets that Janus, known for its stock funds, oversees. Janus will manage $8.7 billion of global macro fixed-income assets, as of March 31, including $1.5 billion in Mr. Gross's Janus Global Unconstrained Bond fund. Janus has about $190 billion of total assets under management.

Janus will make an upfront payment of about $85 million for 51% of the firm; it can purchase the remaining 49% in the future, according to terms of the transaction, Janus said.

"The acquisition of Kapstream furthers our commitment to expand our fixed-income capabilities," Mr. Weil said in a statement.

Kapstream was founded in 2006 to focus on "unconstrained" bond investing, or buying and shorting bonds in any market, the strategy of Mr. Gross's new fund.

Mr. Palghat spent a decade at Pimco working for Mr. Gross. A former World Bank executive, Mr. Palghat was a midlevel portfolio manager in Pimco's global investing team noted for an easygoing personality that stood out on Pimco's charged trading floor, according to someone who worked with him at Pimco.

Along with his work with Mr. Gross, Mr. Palghat will remain portfolio manager of the Kapstream Absolute Return Income Fund, which is only available to Australian investors.

"The opportunity to work with Bill again and create a truly global team was not one we could pass up," Mr. Palghat said in the release.

Kapstream's other founders, Steve Goldman, a former marketing executive, and Nick Maroutsos, a former trade assistant in Pimco's Australia office, will join Janus and help manage fixed-income investments.

Write to Gregory Zuckerman at gregory.zuckerman@wsj.com and Kirsten Grind at kirsten.grind@wsj.com

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