Hull have been fined £40,000 and Arsenal £20,000 and both clubs warned over their future conduct for failing to control their players in a Barclays Premier League match at the Emirates Stadium on December 19.
The bad-tempered encounter erupted shortly before half-time when Samir Nasri appeared to tread on the ankle of Hull's Richard Garcia.
Stephen Hunt then clashed with Nasri and a mass confrontation took place in front of referee Steve Bennett, with Arsenal goalkeeper Almunia sprinting 100 yards to get involved.
Players from both sides became embroiled in ugly scenes with Bennett eventually booking Hunt and Nasri.
A statement from the Football Association today read: "At a regulatory commission hearing this week, Arsenal and Hull City were fined for failing to control their players during a match at the Emirates Stadium in December.
"The clubs were charged in relation to a mass confrontation between players from both sides during the fixture on 19 December. Hull admitted the charge. Arsenal denied the charge but the commission found it proved.
"Hull City were fined £40,000 while Arsenal were fined £20,000. Both clubs were warned as to their future conduct."
Arsenal went on to win the game 3-0.