KEY POINTS
  • "Trees don't grow to the sky, and I see clouds on the horizon," Jack Bogle said in an interview with Barron's published Friday.
  • Bogle is the founder of index fund giant Vanguard Group.
  • "If I had a big liability in a year, I'd get prepared for it right now," Bogle says.
Jack Bogle

Jack Bogle, founder of index fund giant Vanguard Group, is warning investors to prepare for 2019 by decreasing exposure to stocks and increasing investment in defensive strategies, such as fixed income securities like bonds.

"Trees don't grow to the sky, and I see clouds on the horizon. I don't know if and when they'll arrive. A little extra caution should be the watchword," Bogle said, speaking in an interview with Barron's published this weekend. "If you were comfortable at a 70 percent to 30 percent [allocation to stocks and fixed income], under these circumstances you'd like to go back to 60 percent to 40 percent, or something like that."