MetLife's fourth-quarter results show a strong reliance on private equity returns to drive earnings. Adjusted earnings per share rose 19% to $2.49, fueled by a 70% surge in variable investment income, reaching $497 million. This performance reflects its "New Frontier" strategy aimed at boosting returns and achieving double-digit earnings growth.

The insurance giant's success underscores a broader shift in the industry. Insurers are increasingly turning to private markets, including private equity and credit, to enhance yields amid a low-interest-rate environment. These investments offer the potential for higher returns compared to traditional fixed-income instruments. MetLife aims for around $1.6 billion in variable investment income for the year.

This trend is significant for investors, as it highlights how insurers are adapting to generate growth. Private equity investments often come with higher risk but also the potential for greater rewards. MetLife's strategy, if successful, could set a precedent for other insurers.

Looking ahead, the performance of these private equity holdings will be key to MetLife's continued success. Investors will be closely watching the company's ability to meet its earnings targets and manage the inherent risks associated with its investment strategy. The company's focus on private markets reflects a broader trend in the insurance sector.