Punk rock is a genre of music that emerged in the mid-1970s, and while it has had many influential artists, it's hard to identify a single most successful punk artist of all time. However, some of the most successful punk bands and artists include:

1. The Ramones: Often cited as the first true punk rock band, The Ramones have had a lasting impact on the genre. They sold over 75 million records worldwide and were inducted into the Rock and Roll Hall of Fame in 2002.
2. The Sex Pistols: Another influential punk rock band, The Sex Pistols only released one album, "Never Mind the Bollocks, Here's the Sex Pistols," but it had a huge impact on the music world. They are often credited with popularizing punk rock in the UK and were inducted into the Rock and Roll Hall of Fame in 2006.
   
3. The Clash: The Clash were a British punk rock band that incorporated elements of reggae, dub, and rockabilly into their music. They sold over 28 million records worldwide and were inducted into the Rock and Roll Hall of Fame in 2003.
   
4. Green Day: Formed in the late 1980s, Green Day is an American punk rock band that rose to mainstream success in the 1990s. They have sold over 85 million records worldwide and have won multiple Grammy Awards.
   
5. The Offspring: The Offspring is another American punk rock band that rose to popularity in the 1990s. They have sold over 40 million records worldwide and have had multiple top 40 hits.

While there is no single most successful punk artist of all time, these bands and artists have had a significant impact on the punk rock genre and have enjoyed commercial success as well.