Arik Armstead, an American football defensive tackle for the Jacksonville Jaguars, was born on November 15, 1993. He played college football at Oregon and was later drafted by the 49ers in the first round of the 2015 NFL draft.

Arik Armstead played in all 13 games as a true freshman in 2012 for the University of Oregon football team, making one start and finishing the season with 26 tackles and a half-sack.

Arik Armstead played in 13 games as a sophomore in 2013 for the University of Oregon football team, recording 15 tackles and one sack.

Arik Armstead returned to the University of Oregon football team for his junior season in 2014 before declaring for the NFL Draft following the season.

Arik Armstead was selected by the San Francisco 49ers in the first round (17th overall) of the 2015 NFL draft. He joined the team after the conclusion of Oregon's school year due to NFL's policy for rookies.

Arik Armstead earned his first NFL start and made a solo tackle during a victory over the St. Louis Rams in Week 17 of the 2015 season.

On November 8, 2016, the 49ers placed Armstead on injured reserve with a left shoulder injury.

A week later, he had surgery to repair the injured shoulder.

Arik Armstead broke his hand in Week 6 of the NFL season, which led to surgery and caused him to miss the final 10 games of the season.

On October 17, 2017, Armstead was placed on injured reserve after suffering a broken hand in Week 6.

On April 30, 2018, the 49ers picked up the fifth-year option on Armstead's contract.

During Week 3 against the Kansas City Chiefs, he recorded his first sack of the season on Patrick Mahomes.

In Week 7 against the Rams, Armstead recorded a season high five tackles and sacked Jared Goff once.

In the next game against the Cardinals, Armstead sacked rookie quarterback Josh Rosen once.

Arik Armstead made his playoff debut in the NFC Divisional Round against the Vikings, sacking Kirk Cousins once in the 27–10 win.

In the NFC Championship Game against the Packers, Arik Armstead sacked Aaron Rodgers once during the 37–20 win.

In Super Bowl LIV against the Chiefs, Arik Armstead recorded three tackles during the 31–20 loss.

On March 16, 2020, Arik Armstead signed a five-year, $85 million contract extension with the 49ers, with $48.5 million guaranteed. This secured his position with the team for the upcoming years.

On November 16, 2020, Arik Armstead was placed on the reserve/COVID-19 list by the 49ers, impacting his availability for games and the team's overall performance.

On December 7, 2021, Arik Armstead was nominated by the 49ers for the Walter Payton NFL Man of the Year Award, recognizing his contributions on and off the field.

During Week 18 of the 2021 season, Arik Armstead recorded 2.5 sacks in a crucial game against the Rams, helping the 49ers secure a spot in the playoffs.

On November 10, 2022, Arik Armstead revealed that he was rehabbing a hairline fracture in his left ankle, impacting his availability for games and his performance on the field.

Arik Armstead suffered a knee injury on December 3, 2023, after a game against the Philadelphia Eagles, which was later revealed to be a torn meniscus. This injury caused him to miss most off-season activities.

On March 13, 2024, Arik Armstead was released by the 49ers.