Juan José Sartori Piñeyro (born 6 February 1981) is a Uruguayan businessman, senator and co-owner of Sunderland A.F.C..[1] He is the president and founder of Union Group, a privately owned investment management and private equity firm that holds significant interests across an array of industries worldwide, including agriculture, technology, energy and real estate.

At the age of twelve, Sartori moved to Europe and lived in a number of countries, starting in France, while his mother worked for the United Nations.

[6] Sartori's business career began in Switzerland in 2003 when, having just graduated from university, he founded Union Capital Group, which evolved into a multi-billion-dollar assets under management investment firm.

[7] To seek out further investors, Sartori and his business partner, Oscar Costa, recruited Ernesto Cardozo Vasquez, who served as Undersecretary of the Ministry of Livestock, Agriculture, and Fisheries in Uruguay between 2003- 2005 to lead the investment rounds.

[8] Since its incorporation, Union Group and its subsidiaries have performed numerous transactions across the world, growing its portfolio of private and public companies.

[12] In June 2018, UAG eventually had to shrink its territory due to debts, and Vasquez left, followed by Sartori and Costa, who claimed to leave on their own accord but were actually voted out by board shareholders.

[14][15] Investor Charles Brown accused Sartori of diverting "money from UAG to his personal expenses” and called him “an expert in corruption”.

[16] Sartori is the co-founder and chairman of NYSE-listed Union Acquisition Corp (UAC), a SPAC or blank check company, which has taken a number of organizations public over recent years, such as crop technology firm Bioceres Crop Solutions (Nasdaq: BIOX) in 2018, and global healthcare business, Procaps Group (Nasdaq: PROC) in 2021.

[33] In 2022, the club, based in the North East of England, won the League One playoffs, and played following season in the EFL Championship, the second most important division in English football.

[39][40] In 2021, French billionaire Herve Vinciguerra filed a lawsuit in the British Virgin Islands accusing Sartori of conspiring to divert assets from UAG for personal gain, allegedly at the expense of minority shareholders.