NEW YORK (TheStreet) -- Shares of Hewlett Packard Enterprise (HPE) - Get Report  closed down 5.29% to $17.20 in Monday's trading session after the company announced management and organizational changes including the planned retirement of its research chief. 

Martin Fink, chief technology officer and head of Hewlett Packard Labs, will retire at the end of the year, CEO Meg Whitman said in a statement. Hewlett Packard Labs will be moved to the enterprise group, led by Antonio Neri.

Additionally, Chief Customer Officer John Hinshaw, who was responsible for the company's security business and internal IT operations, will leave at the end of the year. His tasks will now fall to Chief Operating Officer Chris Hsu.

HP Enterprise will merge its sales teams into a single global sales organization within its enterprise group, which will be headed by Peter Ryan. He is currently a senior vice president and managing director for Europe, Middle East and Africa.

The company will create one marketing organization under the leadership of Chief Marketing and Communications Officer Henry Gomez, whose responsibilities will include e-commerce and customer advocacy. 

Separately, U.S. markets were pressured for a second trading session today following Britain's decision early Friday to leave the European Union. 

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