Nelson Peltz's Trian Fund Management has taken a stake in Procter & Gamble.
Sources told CNBC that the fund's current position is worth roughly $3.5 billion. Trian may speak with the company, but sources said that the fund has not yet done so.
Shares of the company gained more than 4 percent in after-hours trade Tuesday.
— Reporting by CNBC's David Faber. Written by Christine Wang.
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