UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 001-09818 ALLIANCEBERNSTEIN HOLDING L.P. (Exact name of registrant as specified in its charter) Delaware 13-3434400 (State or other ju ...