 NEW YORK--BUSINESS WIRE--Jefferies Financial Group Inc. NYSE: JEF JFG today announced that it has commenced a cash tender offer for any and all 750 million outstanding aggregate principal amount of its 5.5 Senior Notes due 2023 the Notes, on the terms and subject to the conditions set forth in the Offer to Purchase dated the date hereof as it may be amended or supplemented from time to time, the Offer to Purchase.The tender offer is referred to as the Tender Offer. Title of 