AIG Q1 2026: Strong Premium Growth, but Sustainability Questions Persist

What happened

AIG reported strong Q1 2026 results with net premiums written up 18% year-over-year and global commercial insurance up 21%, continuing its growth trajectory. However, the DeepValue Master report highlights that recent earnings have benefited from unusually low catastrophe losses and favorable prior-year development, which may not persist. The company is also navigating a CEO transition and increased exposure to alternative investments, adding uncertainty. While the top-line momentum is encouraging, the stock at current levels (near book value) already prices in high expectations. Investors should wait for evidence that underwriting margins can hold through a normalized catastrophe cycle and under new leadership.

Implication

The robust Q1 premium growth supports the bull case but does not resolve the key risks of catastrophe normalization, reserving, and leadership transition. The stock trades at ~1x book, leaving limited upside if margins compress. Patience is warranted until 2026 full-year results demonstrate sustained high-80s accident-year combined ratios.

Thesis delta

The Q1 report confirms strong top-line execution, but the underlying earnings quality remains heavily dependent on low catastrophe losses and prior-year development. Our WAIT thesis is reinforced: the positive news does not yet justify upgrading to a BUY, as the risk of normalization in the second half of the year remains. We need to see sub-92% combined ratios with normalized cats and stable reserve releases before becoming more constructive.