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Dorsey, along with co-founder Jim McKelvey, developed a small business platform to accept debit and credit card payments on a mobile device called Square, released in May 2010. The small, square-shaped device attaches to iPhone, iPad, iPod Touch, or Android devices via the headphone jack, and as a mini card reader, allows a person to swipe their card, choose an amount to transfer to the recipient and then sign their name for confirmation. Square is also a system for sending paperless receipts via text message or email, and is available as a free app for iOS and Android OS. The company grew from 10 employees in December 2009 to over 100 by June 2011. Square's office is on Market Street in San Francisco. In September 2012, Business Insider magazine valued Square Inc. at US$3.2 billion. Dorsey is CEO of Square, Inc. On October 14, 2015, Square filed for an IPO to be listed on the New York Stock Exchange. As of that date, Dorsey owned 24.4 percent of the company. In March 2020 the FDIC permitted Square to open a bank. It announced plans to launch Square Financial Services in 2021.
He says his three guiding principles, which he says the company shares, are simplicity, constraint and craftsmanship.