StockX currently has international offices in London, UK, in Eindhoven, the Netherlands, and has authentication facilities in Detroit's Corktown neighborhood, Moonachie, NJ, and Tempe, AZ.

[3][4][5][6] The startup company was founded by Dan Gilbert, Josh Luber,[7] Greg Schwartz, and Chris Kaufman in 2015,[8] and launched in February 2016.

[23] The company's first "StockX Day" event in Detroit, which invited resellers, platform users, and industry influencers to meet employees and see operations, was held in October 2017 and attended by approximately 200 people.

[9][24] In May 2019, the company held a third "StockX Day" event for an audience of 300 and announced the opening of its first permanent location in New York City along with several major product updates.

[9][26] Nike Inc.'s debut of LeBron James' first retro sneaker via StockX marked the first time the brand bypassed retail and went directly to the secondary market.

[29] In September, the company and Bleacher Report reached a multiyear advertising agreement,[30] and Deena Bahri became StockX's first chief marketing officer.

[17] In January 2019, StockX partnered with celebrity jeweler and influencer Ben Baller to sell 800 pairs of black and red slides directly to the public, marking the company's first "initial product offering" ("I.P.O.").

[11] StockX has received financial backing from Gilbert, investment companies Battery Ventures and GV,[17] as well as Scooter Braun, Jon Buscemi, Eminem, Joe Haden,[12] Ted Leonsis,[19] and Mark Wahlberg.

Investors included General Atlantic, GGV Capital, and Yuri Milner's firm DST Global, in addition to Battery Ventures and GV.

[15][40] As of April 8, 2021 an article by Reuters [41] states "Sneaker marketplace StockX said on Thursday it had raised $255 million in a late-stage financing round, valuing the company at more than $3.8 billion.