Nike (NKE - Get Report) was fined $14.14 million (€12.5 million) for blocking cross-border sales of soccer merchandise of some of Europe's most well-known teams. 

The stock was slipping 0.62% to $81.68 in premarket trading Monday.

The European Commission said Nike had been engaging in these tactics between 2004 and 2017, targeting the licensing merchandise of FC Barcelona, Manchester United, Juventus, Inter Milan, AS Roma, and the French Football Federation. Nike had been making and distributing soccer clubs' merchandise, without its own trademarks. One strategy Nike used to implement its illegal tactic was to threaten licensees with ending their contract if they sold out-of-territory, the European Commission said.

"Football fans often cherish branded products from their favorite teams, such as jerseys or scarves," said Margrethe Vestager, EU commissioner. "Nike prevented many of its licensees from selling these branded products in a different country leading to less choice and higher prices for consumers." 

She added, "This is illegal under EU antitrust rules."

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