KEY POINTS
  • The so-called "Magnificent Seven" stocks — Apple, Amazon, Alphabet, Meta, Microsoft, Nvidia and Tesla — now represent around 30% of the entire market cap of the S&P 500 index.
  • Bank CIO Charles-Henry Monchau said the market will undergo a welcome "broadening of the upside participation" as the economy initially enters a technical recession before emerging into recovery later in the year.
  • This prognosis was echoed by Wells Fargo's Scott Wren, who suggested investors reallocate from Big Tech to industrials, materials and health care in preparation for an economic rebound.
Traders work on the floor of the New York Stock Exchange. 

Stock markets have entered a new phase that will involve a broadening of last year's bull market as big U.S. tech stocks come under pressure, according to the CIO of a Swiss private bank.

Charles-Henry Monchau, chief investment officer at Bank Syz, told CNBC's "Squawk Box Europe" on Monday that last week marked the start of what will become a "healthy" rotation.