NEW YORK--(BUSINESS WIRE)--Western Asset Middle Market Debt Fund Inc. (XWAMX) announced the expiration and preliminary results for its tender offer for up to 10% of the Fund’s outstanding shares of common stock (“Shares”). The tender offer expired at 5:00 p.m., New York City time, on July 29, 2015, and was conducted at a price equal to the Fund’s net asset value per Share as of 4:00 p.m., New York City time, on July 29, 2015. All Shares that were validly tendered and not withdrawn during the of