The Dow took 27 days to break free from the technical pullback, with "old economy" leader Caterpillar (CAT.US) emerging as the biggest hero.

After experiencing a continuous 27-day technical correction, the Dow rebounded on Wednesday and officially regained lost ground. The market believes that this rebound not only reflects the return of investor risk appetite, but also highlights the important role of traditional industrial and consumer companies in the artificial intelligence infrastructure boom.