 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether National Holdings Corporation NASDAQ: NHLD and its board of directors violated the federal securities laws andor breached their fiduciary duties to shareholders in connection with the proposed sale of National Holdings to B. Riley Financial, Inc. for 3.25 per share. On behalf of National Holdings shareholders, Halper Sadeh LLP may seek increased consideration for shareholders, additional 