The Wall Street Journal is reporting that Citigroup’s Citibank subsidiary was hacked over the summer, or even earlier, by cyber criminals thought to be part of a Russian gang associated with members of the hacking enterprise, Russian Business Network. Citigroup Inc., $3.34, -$0.08, -2.34%) rose 0.90 percent to $3.37 on Wednesday morning pre-market trading session, while on Tuesday, shares of Citigroup fell 2.34 percent, closed on $3.34.

Citigroup Inc. denied a report filed that claimed federal authorities were investigating the theft of tens of millions of dollars from customer accounts by hackers, and sought to reassure clients that their funds are safe.

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About Citigroup, Inc.

Citigroup Inc., a global financial services company, provides consumers, corporations, governments, and institutions with a range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, and wealth management. The company has two primary segments, Citicorp and Citi Holdings. The Citicorp segment operates as a global bank for businesses and consumers with two primary businesses, Institutional Clients Group and Regional Consumer Banks. The Institutional Clients Group business provides transaction services, such as treasury and trade solutions, and securities and fund services; and securities and banking services, including market making, underwriting and advisory, corporate lending, private banking, and institutional asset management. It serves corporate, institutional, public sector, and private banking clients. The Regional Consumer Banks business provides traditional banking services, including retail banking, and branded cards, and small and middle market commercial banking in North America, Asia, Latin America, and Europe, Middle East, and Africa.