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Square bursts out of the gate in first day as public company

Square CEO Jack Dorsey, right, poses with co-founder Jim McKelvey in front of the New York Stock Exchange before opening bell ceremonies, Thursday, Nov. 19, 2015. Square, the 6-year-old startup known for its white, cube-shaped card readers that plug into smartphones, is surging in its first day as a publicly traded company. (AP Photo/Richard Drew)
Square CEO Jack Dorsey, right, poses with co-founder Jim McKelvey in front of the New York Stock Exchange before opening bell ceremonies, Thursday, Nov. 19, 2015. Square, the 6-year-old startup known for its white, cube-shaped card readers that plug into smartphones, is surging in its first day as a publicly traded company. (AP Photo/Richard Drew) Square CEO Jack Dorsey, right, poses with co-founder Jim McKelvey in front of the New York Stock Exchange before opening bell ceremonies, Thursday, Nov. 19, 2015. Square, the 6-year-old startup known for its white, cube-shaped card readers that plug into smartphones, is surging in its first day as a publicly traded company. (AP Photo/Richard Drew)

NEW YORK (AP) – Square, the 6-year-old startup known for its white, cube-shaped credit and debit card readers that plug into smartphones, surged in its first day as a publicly traded company.

A 45 percent spike caught almost everyone off guard after the company priced its stock at $9, well below what had been expected late Wednesday. The jump in value put the stock above the original $11 to $13 range set last week.

That markdown this week was seen as a concession by the company, headed by Twitter co-founder Jack Dorsey, that investors are becoming wary of once-hot startups that haven’t proven they can make money.

Another startup, The Match Group, also jumped in its first day of trading, rising almost 13 percent.

Square gained $4 to reach $13 in midday trading.