According to Investopedia, a Leprechaun Leader is a corporate manager or an executive who, like the fabled Irish elf, is a mischievous and elusive creature said to possess buried treasures of money and gold.
According to Irish folklore, the location of hidden treasure is revealed only when the leprechaun is caught. In the case of a leprechaun leader, the “buried treasure” is not usually buried, but protected in an offshore account!
Examples of leprechaun leaders are the executives of Enron, who stowed away millions of dollars until they were finally caught. This accounts for the alternative spelling of the buzzword: “Lepre-con Leader.”