Pacific Investment Management Co. named four additional deputy chief investment officers and a new senior generalist portfolio manager, shortly after Chief Executive Mohamed El-Erian announced his retirement.

The firm said earlier this month that it is reorganizing its leadership structure, with CEO and Co-CIO Mr. El-Erian leaving Pimco in mid-March.

Pimco named the following as new deputy chief investment officers: Mark Kiesel, a managing director in the Newport Beach office and global head of the corporate bond portfolio management group; Virginie Maisonneuve, London's managing director and global head of equities; Scott Mather, a Newport Beach managing director and head of global portfolio management; and Mihir Worah, another Newport Beach managing director and head of the real return portfolio management team.

The company also appointed former employee Sudi Mariappa as managing director and generalist portfolio manager in Newport Beach.

Managing director and equities portfolio manager Charles Lahr will leave the firm to pursue other opportunities, Pimco said. Marc Seidner, managing director and portfolio manager, also stepped down to take a job in Boston.

Pimco is a unit of Allianz SE (ALV.XE) and operates the world's largest bond fund, Pimco Total Return.

Write to Everdeen Mason at everdeen.mason@wsj.com

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