**The big picture:** Insurance giant Marsh is expanding its cost-cutting program, Thrive, to $600 million, driven by AI adoption and process improvements in its back office. **Why it matters:** This move signals a significant shift in how large enterprises are leveraging AI to optimize operations, impacting mid - and back-office roles through attrition rather than mass layoffs. **Between the lines:** - Marsh aims for $600 million in annualized savings, up from an initial $400 million target. - Savings are primarily from organizational simplification,