13D Filing: Tracinda Corp and MGM Resorts International (MGM)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE
13D/A

Under Rule 13d-1 of the Securities Exchange Act of 1934

(Amendment No. 51)

MGM Resorts
International

(Name of Issuer)

Common Stock, par value $.01 per share

(Title of Class of Securities)

552953 10 1

(CUSIP
Number)

Anthony L. Mandekic

Tracinda Corporation

6725 Via Austi Parkway, Suite 370

Las Vegas, NV 89119

(702) 978-6161

(Name,
Address and Telephone Number of Person Authorized to Receive Notices and Communications)

September 11, 2017

(Date of Event which Requires Filing of this Statement)

If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following
box.  ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7
for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be
deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).