Leucadia National Corporation (LUK) recently announced that it will increase its stake in Jefferies Group Inc. (JEF), a full service investment bank. The company, in response to Jefferies’ $500 million stock offering, will purchase $125 million of the investment bank’s common shares. The purchase will increase Leucadia’s stock holding in Jefferies to 27.83% from 27.54%. [...] (LUK) Leucadia National to Raise Stake in Jefferies Group