White Mountains Stock Rockets +10% on $1.75B Bamboo Deal – What Investors Need to Know
White Mountains saw one of its biggest single-day moves in years on Oct. 3, 2025. After closing the prior day near $1,665, WTM stock jumped nearly 11% intraday reuters.com, settling around $1,841 by market close. This surge was driven by the surprise announcement that morning: WTM signed an agreement to sell most of its Bamboo homeowners insurance business to private equity firm CVC reuters.com investing.com. Investors reacted strongly because Bamboo had been a high-growth asset for White Mountains. The new deal values Bamboo at $1.75 billion, far above the ~$300 million WTM paid to acquire it in 2024.
