The capital value of global companies involved in building data centers has fallen by $4.2 trillion since June, due to the cooling of investor interest in AI infrastructure, writes the Financial Times. The losses wiped out almost half of the sector's gains in the previous 12 months. The equipment manufacturers were hit the hardest, with the market value of the generator supplier Caterpillar falling by $214 billion (44%) from the all-time high, and the shares of the optical fiber manufacturer Corning losing about half of their value.