Definition of "megabank"

“The megabanks get all the headlines,” said Jaret Seiberg, a research analyst for the Stanford Group, a private wealth management and banking firm.

2008 February 27, Eric Dash, “Small and Midsize U.S. Banks Beginning to Struggle in Credit Crisis”, in New York Times‎

The second reason offered for blanket nonprosecutions for crimes committed at the megabanks involves the possibility that such prosecutions could harm the economy.

2017, Mary Kreiner Ramirez, Steven A. Ramirez, The Case for the Corporate Death Penalty, page 207

While the move has, for now, calmed fears of a repeat of a 2008-style domino effect, the merger has left Switzerland with a new megabank on Paradeplatz square.

2023 March 22, Philip Oltermann, “Switzerland’s national pride dealt heavy blow by the merger of its banking titans”, in The Guardian‎