Procter & Gamble Co. (PG) shares were marked to open lower Monday, July 17, as it looks set to face a proxy battle from Nelson Peltz.

P&G shares were marked 0.25% lower in Monday premarket trading at $86.88. Shares closed at $87.10 on Friday, July 17.

Peltz's Trian Fund Management Monday said it had filed preliminary proxy statement with the Securities and Exchange Commission for the election of Peltz to the P&G board at the company's 2017 annual general meeting, saying that given P&G's disappointing results over the past decade, "Trian has a keen interest in helping the Company address the challenges it is facing."

The move, which will make P&G the largest company to face a proxy battle was first reported by the Wall Street Journal Monday citing people familiar.

Trian, which owns about $3.3 billion of P&G stock, said P&G has underperformed relative to its peers and the S&P 500 over the past decade, saying that total shareholder return was less than half that of its peers and has been in the bottom quartile over recent time frames. 

The activist investor said the consumer products giant needs to address its deteriorating market share, and its excessive cost and bureaucracy. 

P&G, Trian said, has to act with more urgency to address the market share it is losing to both its peers and smaller local competitors. Trian also says that P&G's $10 billion cost-cutting effort launched in 2012 has had no discernible impact of profits or sales growth. The investor also said that P&G has an overly complex organizational structure and a slow moving and insular culture.

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