Nelson Peltz predicts that the postelection market rally will not endure: "Something will disrupt it."

Nelson Peltz, a billionaire investor, believes in the incoming Trump administration but predicts that the stock market rally will not endure.

At the CNBC's Delivering Alpha conference on Wednesday, Trian Partners believes that investors are being misled by the hype and that a cooling down period is imminent.

"Trees do not reach the sky without interruption, as he stated to CNBC's Sara Eisen on stage in New York. He believes that there will be something that disrupts the growth. Although there is euphoria from the election, the international stocks have been severely impacted over the past week."

The market is highly concentrated among a small group of high-momentum stocks, as observed by Peltz.

"There are two distinct markets, with 20 companies performing well and another set of companies doing poorly," he stated.

During the interview, Peltz expressed his continued support for President-elect Trump, whose surprise win on November 5th led to a surge in risk assets such as stocks, metals, and crypto, while bond yields rose in anticipation of economic growth and inflation.

"I've never seen so much optimism," he said. "America is the best country in the world. We are the beacon of hope at the top of the hill, no matter what the saying is, and we stand out as the best among all others. However, we still have problems that we need to address."