US proxy advisory firm Institutional Shareholder Services or ISS recommended that DuPont shareholders vote in favor of Nelson Peltz joining the company's board ahead of voting on May 13.

Shares of DuPont rose nearly 5% to $74.98 on the New York Stock Exchange on Monday. The proxy firm recommended that shareholders vote for another Trian Fund Management LP nominee, John Myers. However, it did not back Trian's other two nominees.

Trian, which currently beneficially owns approximately 24.6 million DuPont shares, said it continues to believe stockholders should elect all four of Trian's nominees, including Arthur Winkleblack and Robert Zatta.

Trian urged DuPont stockholders to protect the value of their investments by voting the GOLD proxy card today to elect Nelson Peltz, John Myers, Arthur Winkleblack, and Robert Zatta.

DuPont said it strongly believes ISS has reached the wrong conclusion in failing to recommend that shareholders vote for all 12 of DuPont's directors.

ISS ignored the success of transformative strategy and the value-destructive nature of Trian's break up agenda. It also dismissed that fact that Trian's nominees would remove critical experience from DuPont's Board.

This exhibits a fundamental lack of understanding of the company's business and the needs of a global science company.

DuPont has refused to add Peltz to its board and has rejected his demand to split the company's volatile materials business from the more stable units such as agriculture, nutrition and health, and industrial biosciences.

Trian criticized DuPont's underperformance for months and has called on the board to be more accountable.

ISS said, "Operating efficiency is not what it should be, yet instead of addressing the core issues, the board and management, at least in their communications with shareholders, are more inclined to obfuscation than accountability".