In 1999, the band signed an international record deal with Island Records. The band released their debut album, All Killer No Filler in 2001. The band achieved mainstream success with their first single from the album, "Fat Lip", which reached number-one on the Billboard Modern Rock Tracks chart and remains the band's most successful single to date. All Killer No Filler was certified platinum in the United States, Canada and in the UK. The band has since released three more studio albums: Does This Look Infected? (2002), Chuck (2004) and Underclass Hero (2007). All three albums have been certified platinum in Canada.
The band often performs more than 300 times each year and holds long global tours, most of which last more than a year. They have been nominated for seven Juno Awards and have won twice (Group of the Year in 2002 and Rock Album of the Year for Chuck in 2005). Their fifth studio album, Screaming Bloody Murder, is set for release March 29, 2011.
 Beginnings and Half Hour of Power (1996–2000)Dave Baksh as lead guitarist a year later and after going through several bassists, ended up picking McCaslin to complete their lineup.
In 1998, the band recorded a demo tape on Compact Cassette which they sent to record companies in the hope of getting a recording contract. These demo tapes are rare and are the only recordings known that are with the original bassist, Richard Roy.
From 1999 to 2000, the band recorded several new songs. The Introduction to Destruction and later the Cross The T's and Gouge Your I's DVDs both contained the self-recorded footage, which saw them performing a dance to "Makes No Difference" in front of a theater.
Sum 41 released the EP, Half Hour of Power on June 27, 2000. The first single released by the band was "Makes No Difference", which had two different music videos. The first video was put together using the video clips sent to the record label and the second showed the band performing at a house party. The EP was certified gold in Canada. Following the success of the EP, the band began working on their first full-length album.
 All Killer No Filler and Does This Look Infected? (2001–2003)
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The success of the album brought the band touring offers with mainstream punk rock bands like Blink 182 and The Offspring. The band spent much of 2001 touring; they played over 300 concerts that year before returning to the studio to record another album. They took the last week of the tour off due to the September 11 terrorist attacks. They later rescheduled the canceled shows.
On November 26, 2002, Sum 41 released their second album, Does This Look Infected?. The special edition came with a DVD, Cross The T's and Gouge Your I's. Whibley said of the album: "We don't want to make another record that sounds like the last record, I hate when bands repeat albums." The album featured a harder and edgier sound, and the lyrics featured a more serious outlook. The album peaked at #32 on the Billboard 200 chart and at #8 on the Top Canadian Albums chart. The album was certified platinum in Canada and gold in the United States, but was not as successful as its predecessor.
The first single released from the album was "Still Waiting", which peaked at #7 on the Modern Rock Tracks chart. The second single, "The Hell Song" peaked at #13 on the chart. "The Hell Song"'s music video depicted the band using dolls with their pictures on them and others, such as Ozzy Osbourne and Pamela Anderson. The third single, "Over My Head (Better Off Dead)", had a video released exclusively in Canada and on their website, featuring live shots of the band. The video also appeared on their live DVD, Sake Bombs And Happy Endings (2003), as a bonus feature. The band again commenced on a long tour to promote the album before recording their third studio album.
 Chuck and the Congo (2004–2006)In late May 2004, the band traveled to the Democratic Republic of Congo with War Child Canada, a branch of the British charity organization War Child, to document the civil war in the country. Days after arriving, fighting broke out in Bukavu near the hotel the band was staying at.
|“||Bullets were coming through windows and everyone was just lying on the ground with their hands on their heads. One bomb came too close, hit the hotel and the hotel just started shaking. Everyone dove and was lying on the ground. Things were falling off the walls, mirrors were breaking. That's when we all kind of realized that this was really going bad, and we're probably not going to make it out.||”|
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The first single from the album was "We're All To Blame", which peaked at #10 on the Modern Rock Tracks chart. It was followed by "Pieces", a relatively soft song which reached the top of the charts in Canada. The next single was "Some Say", released only in Canada and Japan. The last single off the record was "No Reason", released at the same time as "Some Say", but with no music video and was only released in Europe and the USA, where it reached #16 on the Billboard Modern Rock chart.
A documentary of their experience in Congo was made into a film called Rocked: Sum 41 in Congo and later aired on MTV. War Child released it on DVD on November 29, 2005, in the United States and Canada.
On December 21, 2005, Sum 41 released a live album, Happy Live Surprise, in Japan. The CD contained a full concert recorded live from London, Ontario and was produced by Whibley. The same CD was released March 7, 2006, in Canada under the name Go Chuck Yourself.
 Baksh's departure and Underclass Hero (2006–2008)Dave Baksh announced in a statement through his management company that he was leaving Sum 41 to work with his new band, Brown Brigade, which has a more "classic metal" sound. Baksh cited "creative differences" as the reason for his departure but claimed that he was still on good terms with the band. The next day, Whibley confirmed Baksh's departure and announced that the band would only replace Dave with a touring guitarist, who would not have any decision-making power in the band or be in videos, photo shoots, or albums.
Sum 41 returned to more of a pop-punk sound in Underclass Hero.
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On April 17, 2007, the band released a song on iTunes, "March of the Dogs". Although not a single, the band released it early because, according to Whibley, "the record [wouldn't] be out until the summer". Whibley was threatened with deportation for the song, because he metaphorically "killed the president" in it. Two more singles were released from the album, "Walking Disaster" and "With Me". Underclass Hero was certified platinum in Canada.
In October 2007, the band began the Strength In Numbers Tour, a tour of Canada with Canadian band Finger Eleven; Die Mannequin opened each of Sum 41's shows. During the tour, Whibley sustained a herniated disk. As a result, they canceled the rest of their shows. After Whibley recovered from his injury, the band recommenced the Underclass Hero tour in March 2008. They toured until early July, when they began preparation for their next album.
 Greatest Hits and Screaming Bloody Murder (2008–present)On August 7, 2008, McCaslin announced in a journal entry on the band's official site that the band was currently taking time off from touring to do other things. Afterward, they would begin working on the band's next studio album. McCaslin worked on the second album by his side-project, The Operation M.D.. Jocz toured as a drummer for The Vandals, and Whibley toured with his (then) wife, Avril Lavigne.
Sum 41 released a press release that mentioned that following the success of Underclass Hero, Universal Music picked up the option to have Sum 41 produce an EP in 2009. However, Deryck stated that the new EP was quickly turning into an LP due to the amount of music they had recorded, which was more than what they had initially planned. The band entered the studio in late 2008 for a plan to release the album sometime during 2009, with a supporting tour in the summer.
On November 26, 2008 Sum 41 released 8 Years of Blood, Sake and Tears, a greatest hits album, in Japan. The album included a previously unreleased song, "Always", and a DVD, which contains each of the band's music videos. In February 2009, the band said that due to the success and demand for the greatest hits album, they had decided to release it worldwide, although with a different title and artwork. On March 17, All the Good Shit was released.
On February 15, 2009, Deryck posted a news bulletin on the band's website stating that the band had decided to make a full album instead of an EP. He went on to say that "it's safe to say" the album will be released in 2009.
On July 20, 2009, Steve posted a blog on the band's website saying that the band finished all their tour dates for the year after their summer tour with The Offspring, and that they were going to take the rest of the year off to finish working on their album. He has also confirmed that new lead guitarist Tom Thacker will take part in the writing and recording.
On July 31, 2009, in an interview with Steve and Cone, they told fans to expect the new album to be released around the Summer of 2010, although it might be released sooner. In the same interview, they claimed to have 5 or 6 songs already done. In a recent interview with OK! Magazine, Deryck said that the band is considering recording the new album in a "crazy" chateau outside of Paris, France, just to do something different. He also said that they have 15 to 18 new songs, but haven't laid any tracks for them down yet. He also said that Sum 41 fans should "brace themselves" for a "less poppy, more punchy record".
On November 5, 2009, Deryck posted a blog on the band's MySpace page announcing Gil Norton as the producer of the band's upcoming album, also saying that 20 songs were already written for the album. In an interview with Tom Thacker, some working titles for songs for the new album were confirmed, including "Panic Attack", "Jessica Kill" and "Like Everyone Else".
Sum 41 was confirmed for playing the entire 2010 Warped Tour. This was the band's fourth time on the tour. However, the band had to cancel several dates toward the end of the tour, after Whibley was hospitalized for a slipped disc in his back after he was attacked at a bar in Japan.
On March 17, 2010, the band finished recording all instruments for the new album, with only vocals left to be tracked by Deryck Whibley at his own home studio. On April 7, 2010, the whole band returned to the studio to record a couple more last minute songs for the album. In a video update from June 12, 2010, Deryck Whibley has confirmed that the album is "99% done".
The new studio album, titled Screaming Bloody Murder, was expected for a late 2010 release, until it was delayed again until early 2011. The band finished recording on June 24, 2010, just before joining the 2010 Warped Tour, and while they were on the tour, the new album entered the post-production stages of mixing and mastering. A new song called "Skumfuk" was leaked online on July 6, 2010. The song is not a single off the new album, and was hoped to be included as part of a Warped Tour compilation album. In an interview with Canoe.ca, Steve Jocz stated that while producer Gill Norton was originally hired to engineer the new album, he was only around for a week and Sum 41 self-produced their record.
In December 2010, Cone McCaslin has confirmed that the album will finally go into mastering with Island Records giving the band a tentative release date of March 2011 for the album. A few days later, Deryck Whibley has confirmed the March 2011 release date.
On January 8, 2011, it was announced that the band will release the radio single "Screaming Bloody Murder" on February 7, 2011 in the United States. The song had its worldwide premiere on January 14, 2011, on the Windsor radio station 89X. Universal Japan has confirmed on the official Japanese Sum 41 website, that Screaming Bloody Murder will be released in Japan on March 23, 2011, after which it was confirmed on the band's official website that the album be released on March 29, 2011, in the US. On February 28, 2011, a stream of 'Blood In My Eyes' a song from the new album was released as a stream on altpress.com.
 Other projects
 Internet videos They made several other videos, including Basketball Butcher and 1-800-Justice, which were originally available exclusively on Sum 41's now-defunct fan club, The Goon Platoon.
Sum 41's most recent internet video project is a "weekly series," SUM 41 - Road to Ruin. The trailer was posted on January 8, 2007 on the Sum 41 web page. The first episode debuted on January 21; it followed their exploits on their Singapore 2003 tour. Since then, their episodes have included footage of drunkenness in New Orleans, setting off a fire alarm in a hotel, and a feature about their first tour manager. So far, they have released ten episodes, with their latest and as they have stated recently, their 'last' for now being an episode that features their guitar technician. They also created a series of cartoons based on superhero "Stickman Moss" who saved the world from anti-punk figures who endangered the world of punk rock.
In December 2009, the band launched a new daily update series from the pre-production of their upcoming fifth studio album. It was announced on the band's Myspace page that the daily updates will run for the 2–3 weeks of pre-production. 13 video updates from the pre-production were made and posted on the band's Myspace page.
 Side projects and collaborationsBefore the release of Half Hour of Power and up until the departure of Dave Baksh, Sum 41 occasionally played as an alter-ego 1980s heavy metal band called Pain for Pleasure during shows. The band appeared in Sum 41's music videos for "Fat Lip" and "We're All to Blame" and had at least one song on each of the band's first three releases. Their best known song under the Pain for Pleasure moniker is "Pain for Pleasure" from All Killer No Filler, a track that remains their staple during live shows.
Sum 41 has collaborated with many other artists, both live and in the studio, among whom are Tenacious D, Ludacris, Iggy Pop, Pennywise, Bowling for Soup, Unwritten Law, Treble Charger, Nelly, Gob, Tommy Lee, Rob Halford, Metallica, and Ja Rule.
Shortly after touring for Does This Look Infected?, Sum 41 was recruited by Iggy Pop for his album, Skull Ring. Deryck co-wrote the first single from the album, "Little Know It All", and joined Iggy on The Late Show with David Letterman to promote the song. Following their September 11, 2005 show in Quebec City, Quebec, the band went on a touring hiatus, although on April 17, 2006, Sum 41 played at a tribute to Iggy Pop, joining Iggy on stage for "Little Know It All" and "Lust For Life".
During the band's 2006 touring hiatus, Whibley focused on his producing career: he produced two songs for Avril Lavigne's album The Best Damn Thing. Jocz recorded his first video as director for a Canadian band, The Midway State, and McCaslin started a side project with Todd Morse of H2O and Juliette and the Licks. McCaslin's two-person band, named The Operation M.D., released their debut album, We Have an Emergency, in early 2007. As well as playing bass, keyboards, and acoustic guitar, Cone contributed backing vocals as well as leading vocals on three songs. The album was co-produced and mixed by Whibley. Their video for their first single, "Sayonara", was directed by Jocz.
In December 2007, McCaslin interviewed Slash of Velvet Revolver. They talked about Slash's experiences while in Guns N' Roses and his part in Velvet Revolver. The interview was part of a MySpace project and was posted on the site in three parts.
The 2010 video game VANCOUVER 2010™ - THE OFFICIAL VIDEO GAME OF THE OLYMPIC WINTER GAMES features Sum 41's "Open Your Eyes" from Chuck as one of the game's songs.
 Music styleThe genre of Sum 41's music has been disputed by fans because of the complex combination of different musical styles and the more mature, serious, and heavy sound in later albums. Fans and critics agree that Half Hour of Power and All Killer No Filler were mainly pop punk, punk rock and rapcore, but Does This Look Infected? and Chuck started moving toward heavier styles, such as alternative rock and alternative metal. Critics have described Underclass Hero as a revival of the band's old pop punk style. The genre argument is centralized around the punk streak of the band, and they have been labeled as pop punk, punk rock and alternative rock. Some of the band's songs contain political-social commentary; "The Jester" is an "anti-Bush screed", "Underclass Hero" is a song about class struggle, and "Dear Father" is about Deryck's absent father.
 Awards and nominationsSum 41 has been nominated for seven Juno Awards; they won twice. In 2001, they were nominated for "Best New Group" at the Juno awards, but lost to Nickelback. They were nominated for "Best Group" in the Juno Awards of 2002 but again lost to Nickelback. Also in 2002, The album All Killer No Filler was nominated for "Best Album; however, it lost to The Look of Love by Diana Krall. In 2003, Sum 41 won a Juno Award for "Group Of The Year". In 2004, they were nominated again, this time with Does This Look Infected? for "Rock Album of the Year", but they lost to Sam Roberts's We Were Born in a Flame. In 2005, the album Chuck won "Rock Album of the Year"; they were also nominated for "Group of The Year", but lost to Billy Talent. In 2008, their album Underclass Hero was nominated for the Juno Award "Rock Album of the Year"; however, the album lost to Finger Eleven's Them vs. You vs. Me. They also have been nominated for three different Canadian Independent Music Awards. In 2004, they won a Woodie Award for "The Good Woodie (Greatest Social Impact)". They were also nominated for a Kerrang! Award in 2003 for "Best Live Act".
 Band members
 Current members
- Deryck "Bizzy D" Whibley - lead vocals, rhythm guitar, keyboard (1996–present)
- Jason "Cone" McCaslin - bass guitar, backing vocals (1998–present)
- Steve "Stevo" Jocz - drums, percussion (1996–present)
- Tom "Brown Tom" Thacker - lead guitar, backing vocals (2007–present)
 Former members
- Marc Costanzo - guitar (1996–1997)
- Jon Marshall - lead vocals, guitar (1997–1998)
- Mark Spicoluk - bass, vocals (1996–1997)
- Richard "Twitch" Roy - bass, vocals (1997–1998)
- Dave "Brownsound" Baksh - lead guitar, backing vocals (1997–2006)