An alternative to the classic 60/40 portfolio is having its best stretch in 30 years. Here's how to replicate it.

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• The "permanent portfolio" is seeing its best decade since the 90s, Bank of America says.
• The portfolio's 2025 performance returned 23%, the best year since 1979.
• Consider ETFs for exposure to this alternative to the classic 60/40 portfolio mix.

Bank of America says there's a strong alternative to investors looking to shake up the traditional 60/40 portfolio.

The so-called "permanent portfolio" — 25% stocks, 25% bonds, 25% gold...