KEY POINTS
  • Japan's Nikkei 225 smashed through the 40,000 level on Monday, soaring to another record high — but it did not surprise Japan expert Jesper Koll who expects another 37% upside for the benchmark stock index.
  • Koll has predicted the Nikkei could rise to 55,000 points by end-2025, saying it is "perfectly reasonable."
  • Still, there are risks that could derail that optimism. They include tax hikes in Japan and a potential global trade war, both of which could hurt Japanese stocks, Koll noted.
Skyline of Tokyo, Japan.

Japan's Nikkei 225 smashed through the 40,000 level on Monday, soaring past another milestone to a new record high — but it did not surprise Japan expert Jesper Koll who expects another 37% upside for the benchmark stock index.

"In my view, it is perfectly reasonable to expect a rise in the Nikkei to 55,000 by end-2025. I [know I sound] more like a bubble-era stockbroker than a gentleman, but I cannot hide my excitement," Koll, expert director at financial services firm Monex Group, told CNBC on Monday.