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Activist investor Elliott Investment Management has built a stake of more than $1 billion in Lululemon Athletica

and is bringing a potential CEO candidate to the table, a person familiar with the matter told CNBC.

Lululemon’s stock rose 6% in early trading Thursday.

Last week, Lululemon announced CEO Calvin McDonald would step down effective Jan. 31, following a year-long performance slump for Lululemon.