"Birmingham City and Aston Villa have been fined 5,000 pounds following their EFL Championship fixture on 10 March 2019," the FA said in a statement.
"Both clubs accepted a charge and the standard penalty for failing to ensure that their players conducted themselves in an orderly fashion during the fifth minute."
A Birmingham supporter was jailed for 14 weeks for running on to the field of play and punching Grealish later on in the match.
Grealish, who escaped unhurt, eventually scored the winner as Villa won 1-0 to leapfrog their derby rivals in the standings.
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(Reporting by Rohith Nair in Bengaluru; Editing by Christian Radnedge)
