The company has not met the main market's requirements for information disclosure during the 12 months preceding the request, the Sofia bourse operator said in a statement.
Earlier this year, Holding Center raised 17.3 million levs ($9.9 million/8.8 million euro) in a capital increase via a new share issue.
Holding Center shares last traded on the Bulgarian Stock Exchange at a price of 31.8 levs.
(1 euro = 1.95583 levs)