CM Punk: WWE, AEW, ROH, ECW World Champion

Professional Wrestling: CM Punk is the only wrestler to win the World Championship in WWE, AEW, ROH, and ECW.

He also more specifically won every world title in WWE. Not only the WWE and ECW titles but also the WHC. 

This makes him one of the most decorated wrestlers across major wrestling promotions. Big Show also has won the ECW, WHC, and the undisputed WWE title in WWE.

WWE Titles of CM Punk

Punk has not taken the WWE title home in his kitty only once. He has already achieved them all. He first grabbed gold for himself in WWE when he gained the ECW Championship. Then, he took the highly sought WWE Championship, and during that time, Punk had the face of the company as his opponent.

Pun also became the World Heavyweight Champion, making him a top-order performer in WWE. As far as success is concerned, CM Punk was just partially successful in AEW and fully successful in ROH.

CM Punk: WWE, AEW, ROH, and ECW World Champion

After leaving WWE, CM Punk once again wrestled in AEW. Its victory of its world title there further verified his long-term success and an ability to win the hearts of audience viewers. Some years prior, in Ring of Honor (ROH), Punk already was the name that made waves as he took and won their world title, proving independent scene talent raises the bar.

Why CM Punk's wins matter

Consistency: CM Punk dominated across different styles and companies.

Versatility: He wasn't one promotion; he was a straight-out winner in every environment.

Legacy: Punk's name is forever etched with multi-championships under his belt in every biggest wrestling promotion currently in existence.

From WWE to ECW and AEW, CM Punk's wrestling history in all those promotions is something unique. No one else who has stepped foot in the squared circle has won the marquee, professional wrestling world titles of all major promotions. And it keeps on growing more, and his name is carved into the history books of wrestling.