Arthur J. Gallagher & Co. (AJG) climbed 5.41% on September 15, 2026, bringing the share price to $253.47. The move pushed the insurance brokerage's market capitalization to $61.6 billion.
Despite the strong daily performance, AJG shares remain 3.47% lower over the past seven days, indicating the session's rally only partially offset a broader recent pullback. Over the past 30 days, however, the stock has edged up 0.90%, suggesting the longer-term trend remains modestly positive.
Arthur J. Gallagher & Co. operates as one of the larger insurance brokerage and risk management firms in the United States. Tuesday's gain represents one of the more notable single-session moves for the stock in recent weeks, reversing a portion of the prior week's losses.
