Filed Pursuant to Rule 424(b)(5)
Registration No. 333-218090

The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell the Class A shares and are not a solicitation of an offer to buy the Class A shares in any jurisdiction where the offer or sale is not permitted.

Subject to completion, dated January 28, 2019

Prospectus supplement

(To prospectus dated May 18, 2017)

14,500,000 Shares

MGM Growth Properties LLC

Class A shares

This is an offering by MGM Growth Properties LLC (“MGP”). We are offering 14,500,000 Class A common shares representing limited liability company interests (the “Class A shares”) of MGP. The Class A shares are listed on The New York Stock Exchange under the symbol “MGP.” The last reported sale price of Class A shares on The New York Stock Exchange on January 25, 2019 was $30.16 per share.

An investment in MGP’s Class A shares involves risks. See “Risk Factors” beginning on page S-16 of this prospectus supplement and the risks set forth under the caption “Item 1A. Risk Factors” included in our Annual Report on Form 10-K for the year ended December 31, 2017 and in our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2018, June 30, 2018 and September 30, 2018 which are incorporated by reference herein.

The underwriters may also exercise their overallotment option to purchase an additional 2,175,000 Class A shares from us, at the public offering price, less the underwriting discount, for 30 days after the date of this prospectus supplement.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION (THE “COMMISSION”) NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THE SECURITIES DESCRIBED HEREIN OR PASSED UPON THE ADEQUACY OR ACCURACY OF THIS PROSPECTUS SUPPLEMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

NO GAMING OR REGULATORY AGENCY HAS APPROVED OR DISAPPROVED OF THESE SECURITIES, OR PASSED UPON THE ADEQUACY OR ACCURACY OF THIS PROSPECTUS SUPPLEMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

We expect to deliver the Class A shares against payment in New York, New York on or about                     , 2019 through the facilities of The Depository Trust Company.

Joint book-running managers

Prospectus Supplement dated January     , 2019

Table of contents

Prospectus supplement

Prospectus

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About this prospectus supplement

This prospectus supplement is a supplement to the accompanying base prospectus that is also a part of this document. This prospectus supplement and the accompanying base prospectus are part of a “shelf” registration statement that we filed with the Commission. The shelf registration statement was deemed effective by the Commission upon filing on May 18, 2017. By using a shelf registration statement, we may sell any combination of the securities described in the base prospectus from time to time in one or more offerings. In this prospectus supplement, we provide you with specific information about the terms of this offering.

You should rely only on the information or representations incorporated by reference or provided in this prospectus supplement and the accompanying prospectus or in any free writing prospectus filed by us with the Commission. We have not and the underwriters have not authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. If the description of this offering varies between this prospectus supplement and the accompanying prospectus, you should rely on the information contained in or incorporated by reference in this prospectus supplement. You may obtain copies of the shelf registration statement, or any document which we have filed as an exhibit to the shelf registration statement or to any other Commission filing, either from the Commission or from the Secretary of MGP as described under “Where You Can Find More Information” in the accompanying prospectus. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or any free writing prospectus is accurate as of any date other than the date on the front cover of this prospectus supplement or the date of the accompanying prospectus, free writing prospectus or any such document incorporated by reference, as applicable. Our business, financial condition, results of operations and prospects may have changed since that date.

Basis of presentation

Except as otherwise stated, or unless the context otherwise requires, all references in this prospectus supplement to (i) “we,” “us,” “our,” “our company,” “the Company” or “MGP” refer to MGM Growth Properties LLC and its consolidated subsidiaries, including MGM Growth Properties Operating Partnership LP (the “Operating Partnership”), a Delaware limited partnership, so long as MGP, or a subsidiary of MGP, is the general partner of the Operating Partnership. and (ii) “MGM” are to MGM Resorts International, a Delaware corporation, and, unless the context requires otherwise, its consolidated subsidiaries, including MGP.

References in this prospectus supplement to (i) the “Revolving Credit Facility” are to the Operating Partnership’s $1.35 billion senior secured revolving credit facility, (ii) the “Term Loan A Facility” are to the Operating Partnership’s $470.0 million senior secured term loan A facility and (iii) the “Term Loan B Facility” are to the Operating Partnership’s $1.80 billion senior secured term loan B facility, in each case as the same may be amended, supplemented or restated from time to time and, unless otherwise expressly stated or the context otherwise requires, including any successor credit facilities.

Unless otherwise indicated, the information in this prospectus supplement assumes no exercise by the underwriters of their overallotment option to purchase additional Class A shares.

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Certain operational and non-U.S. GAAP financial measures of MGM and MGP

Funds From Operations (“FFO”) and pro forma FFO are financial measures that are not prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and are considered a supplement to U.S. GAAP measures for the real estate industry. We define FFO as net income (computed in accordance with U.S. GAAP), excluding gains and losses from sales or disposals of property (presented as property transactions, net), plus real estate depreciation, as defined by the National Association of Real Estate Investment Trusts (“NAREIT”). We prepare pro forma FFO by adjusting FFO to give effect to the net income associated with recent acquisitions, dispositions and related financing transactions as if those acquisitions, dispositions and related financing transactions had occurred on January 1, 2017 (and only to the extent not reflected in historical financial results), including: the MGM National Harbor Transaction (as defined below), the MGM National Harbor Financing Transactions (as defined below), the Northfield Acquisition (as defined below), the Northfield OpCo Disposition (as defined below), the Empire City Transaction (as defined below) and the Park MGM Lease Transaction (as defined below) (collectively, the “Pro Forma Transactions”). For a reconciliation of FFO and pro forma FFO to the most directly comparable U.S. GAAP measure, see “Summary—Summary Historical Condensed Consolidated and Pro Forma Financial Data—Reconciliation of Net Income to FFO, AFFO and Adjusted EBITDA and of Pro Forma Net Income to Pro Forma FFO, Pro Forma AFFO and Pro Forma Adjusted EBITDA.” Additional information with respect to the calculation of “pro forma FFO” is presented under “Unaudited Pro Forma Condensed Consolidated Financial Data.”

We define Adjusted Funds From Operations (“AFFO”) as FFO as adjusted for amortization of financing costs and cash flow hedges, amortization of the above market lease, net, non-cash compensation expense, acquisition-related expenses, other non-operating expenses, provision for income taxes related to the real estate investment trust (“REIT”), other depreciation and amortization, and the net effect of straight-line rent and amortization of deferred revenue and lease incentives. We prepare pro forma AFFO by adjusting AFFO to give effect to the amortization of certain costs and expenses associated with the Pro Forma Transactions as if the Pro Forma Transactions had occurred on January 1, 2017 (and only to the extent not reflected in historical financial results). For a reconciliation of AFFO and pro forma AFFO to the most directly comparable U.S. GAAP measure, see “Summary—Summary Historical Condensed Consolidated and Pro Forma Financial Data—Reconciliation of Net Income to FFO, AFFO and Adjusted EBITDA and of Pro Forma Net Income to Pro Forma FFO, Pro Forma AFFO and Pro Forma Adjusted EBITDA.” Additional information with respect to the calculation of “pro forma AFFO” is presented under “Unaudited Pro Forma Condensed Consolidated Financial Data.”

We define Adjusted EBITDA as net income (computed in accordance with U.S. GAAP) as adjusted for gains and losses from sales or disposals of property (presented as property transactions, net), real estate depreciation, other depreciation and amortization, interest income, interest expense (including amortization of financing costs and cash flow hedges), amortization of the above market lease, net, non-cash compensation expense, acquisition-related expenses, other non-operating expenses, provision for income taxes and the net effect of straight-line rent and amortization of deferred revenue and lease incentives. We prepare pro forma Adjusted EBITDA by adjusting Adjusted EBITDA to give effect to the Pro Forma Transactions as if the Pro Forma Transactions had occurred on January 1, 2017 (and only to the extent not reflected in historical financial results). For a reconciliation of Adjusted EBITDA and pro forma Adjusted EBITDA to the most directly comparable U.S. GAAP measure, see “Summary—Summary Historical Condensed Consolidated and Pro Forma Financial Data—Reconciliation of Net Income to FFO, AFFO and Adjusted EBITDA and of Pro Forma Net Income to Pro Forma FFO, Pro Forma AFFO and Pro Forma Adjusted EBITDA.” Additional information with respect to the calculation of “pro forma Adjusted EBITDA” is presented under “Unaudited Pro Forma Condensed Consolidated Financial Data.”

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FFO, AFFO, Adjusted EBITDA, pro forma FFO, pro forma AFFO and pro forma Adjusted EBITDA are supplemental performance measures that have not been prepared in conformity with U.S. GAAP that management believes are useful to investors in comparing operating and financial results between periods. Management believes that this is especially true since these measures exclude real estate depreciation and amortization expense and management believes that real estate values fluctuate based on market conditions rather than depreciating in value ratably on a straight-line basis over time. The Company believes such a presentation also provides investors with a meaningful measure of the Company’s operating results in comparison to the operating results of other REITs. Adjusted EBITDA and pro forma Adjusted EBITDA are useful to investors to further supplement FFO, AFFO, pro forma FFO, pro forma AFFO and to provide investors a performance metric which excludes interest expense. In addition to non-cash items, the Company adjusts AFFO, Adjusted EBITDA, pro forma AFFO and pro forma Adjusted EBITDA for acquisition-related expenses. While we do not label these expenses as non-recurring, infrequent or unusual, management believes that it is helpful to adjust for these expenses when they do occur to allow for comparability of results between periods because each acquisition is (and will be) of varying size and complexity and may involve different types of expenses depending on the type of property being acquired and from whom.

FFO, AFFO, Adjusted EBITDA, pro forma FFO, pro forma AFFO and pro forma Adjusted EBITDA do not represent cash flow from operations as defined by U.S. GAAP, should not be considered as an alternative to net income as defined by U.S. GAAP and are not indicative of cash available to fund all cash flow needs. Investors are also cautioned that FFO, AFFO, Adjusted EBITDA, pro forma FFO, pro forma AFFO and pro forma Adjusted EBITDA as presented may not be comparable to similarly titled measures reported by other REITs due to the fact that not all real estate companies use the same definitions.

Please see “Prospectus Supplement Summary—Summary Historical Condensed Consolidated and Pro Forma Financial Data—Reconciliation of Net Income to FFO, AFFO and Adjusted EBITDA and of Pro Forma Net Income to Pro Forma FFO, Pro Forma AFFO and Pro Forma Adjusted EBITDA” for a reconciliation of our net income to FFO, AFFO and Adjusted EBITDA and pro forma net income to Pro Forma FFO, Pro Forma AFFO and Pro Forma Adjusted EBITDA.

A subsidiary of MGM (the “Tenant”) is currently the sole lessee under our master lease agreement (the “Master Lease”), and MGM guarantees the Tenant’s performance and payments under the Master Lease. In order to evaluate the business results of casino resorts, MGM monitors their net revenues and Adjusted Property EBITDA. MGM uses Adjusted Property EBITDA as the primary performance measure for its reportable segments. Adjusted EBITDA is a measure defined as earnings before interest and other non-operating income (expense), taxes, depreciation and amortization, preopening and start-up expenses, NV Energy exit expense and property transactions, net. Adjusted Property EBITDA is a measure defined as Adjusted EBITDA before corporate expense and stock compensation expense, which are not allocated to each property. Adjusted EBITDA or Adjusted Property EBITDA should not be construed as an alternative to operating income or net income as an indicator of MGM’s performance; an alternative to cash flows from operating activities, a measure of liquidity; or as any other measure determined in accordance with U.S. GAAP. MGM has significant uses of cash flows, including capital expenditures, interest payments, taxes and debt principal repayments, which are not reflected in Adjusted EBITDA or Adjusted Property EBITDA. Also, other companies in the gaming and hospitality industries that report Adjusted EBITDA or Adjusted Property EBITDA information may calculate Adjusted EBITDA or Adjusted Property EBITDA in a different manner.

Please see Annex I of this prospectus supplement for a reconciliation of MGM’s Adjusted EBITDA and Adjusted Property EBITDA to net income (loss) and MGM’s operating income (loss) to Adjusted Property EBITDA and Adjusted EBITDA, all as reported by MGM.

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Trademarks and tradenames

The names of the brands of our casino resorts that are operated by MGM are registered trademarks of the respective owners of those brands, and neither they nor any of their officers, directors, agents or employees:

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Cautionary statement concerning forward-looking statements

This prospectus supplement and the accompanying prospectus includes or incorporates by reference “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects,” “may,” “will” and similar references to future periods. In particular, our unaudited pro forma condensed consolidated financial data and all of our statements regarding anticipated growth in our FFO, AFFO and Adjusted EBITDA and anticipated market conditions, demographics and results of operations are forward-looking statements. Examples of forward-looking statements include, but are not limited to, statements we make regarding our ability to meet our financial and strategic goals and our ability to further grow our portfolio and drive value. The foregoing is not a complete list of all forward-looking statements we make.

Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks, and changes in circumstances that are difficult to predict. Our actual results may differ materially from those contemplated by the forward-looking statements. They are neither statements of historical fact nor guarantees or assurances of future performance. Therefore, we caution you against relying on any of these forward-looking statements. The following factors that affect us and MGM, among others, could cause actual results and future events to differ materially from those set forth or contemplated in the forward-looking statements:

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While forward-looking statements reflect our good-faith beliefs, they are not guarantees of future performance. We disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors of new information, data or methods, future events or other changes. For a further discussion of these and other factors that could impact our future results, performance or transactions, see the section entitled “Risk Factors” and the other information included or incorporated by reference in this prospectus supplement.

Any forward-looking statement made by us in this prospectus supplement and the accompanying prospectus or included or incorporated herein or therein speaks only as of the date on which it is made. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law. If we update one or more forward-looking statements, no inference should be made that we will make additional updates with respect to those or other forward-looking statements.

You should also be aware that while we from time to time communicate with securities analysts, we do not disclose to them any material non-public information, internal forecasts or other confidential business information. Therefore, you should not assume that we agree with any statement or report issued by any analyst, irrespective of the content of the statement or report. To the extent that reports issued by securities analysts contain projections, forecasts or opinions, those reports are not our responsibility and are not endorsed by us.

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Risk factors

Before you decide to invest in the Class A shares, you should be aware that investment in the Class A shares carries various risks, including those described below, that could have a material adverse effect on our business, financial position, results of operations and cash flows. We urge you to carefully consider these risk factors, together with all of the other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus, before you decide to invest in the Class A shares. In addition, we identify other factors that could affect our business in our and the Operating Partnership’s most recent combined Annual Report on Form 10-K (including any amendments thereto), in our and the Operating Partnership’s subsequent combined Quarterly Reports on Form 10-Q (including any amendments thereto), and in our and the Operating Partnership’s other filings with the Commission, all of which are incorporated by reference in this prospectus supplement and the accompanying prospectus as described under “Incorporation of Certain Information by Reference.”

Risks related to recent and proposed transactions

We may be unable to complete the Northfield OpCo Disposition, the Empire City Transaction or the Park MGM Lease Transaction or may not consummate such transactions on the terms described herein.

On May 28, 2018, MGP entered into an agreement to acquire the real property associated with Empire City from MGM. On September 18, 2018, MGP entered into an agreement to sell Northfield OpCo to a subsidiary of MGM. In addition, on December 20, 2018, MGP entered into a definitive agreement with MGM whereby MGP will pay MGM consideration of $637.5 million for renovations undertaken by MGM regarding Park MGM and the annual rent under the Master Lease will be increased by $50.0 million. Although the Empire City Transaction is expected to close in the first quarter of 2019 and the Northfield OpCo Disposition and the Park MGM Lease Transaction are expected to close in the first half of 2019, the consummation of each transaction is subject to certain customary regulatory and other closing conditions, which makes its completion and timing uncertain. Accordingly, there can be no assurance that the Northfield OpCo Disposition, the Empire City Transaction or the Park MGM Lease Transaction will be consummated on the anticipated schedule or at all.

On January 28, 2019, the Empire City Transaction was approved by the New York State Gaming Commission. Although MGM and MGP intend to consummate the Empire City Transaction on or about January 29, 2019, the transaction remains subject to the satisfaction of other closing conditions, and accordingly there can be no assurance that the transaction will be consummated on the anticipated schedule or at all.

If we are unable to complete the Northfield OpCo Disposition, we may be required to identify a new purchaser and renegotiate the sale of the Northfield OpCo, and any such new sale would also be subject to new regulatory and other conditions. Such renegotiation and conditions and the process of obtaining regulatory approvals could have the effect of delaying or impeding consummation of the sale of Northfield OpCo or imposing additional costs or limitations on us following completion of the sale of Northfield OpCo.

A delay or failure to sell Northfield OpCo to MGM or any other potential purchaser or to consummate the Empire City Transaction or the Park MGM Lease Transaction could have a material adverse effect on our business, financial position or results of operations.

Our ownership of the TRS, which we formed in connection with the Northfield Acquisition, will be subject to limitations, and a failure to comply with the limits could jeopardize our REIT qualification.

We acquired Northfield using a TRS. This TRS will earn income that would not be qualifying income if earned directly by us. No more than 20% of the value of a REIT’s assets may consist of stock and securities of one or more TRSs. In addition, the TRS rules impose a 100% excise tax on certain transactions between a TRS and us that are not conducted on an arm’s-length basis.

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Our TRS will pay U.S. federal, state and local income tax at regular corporate rates on its taxable income, including any gains that may result from selling the operating assets, and its after-tax net income would be available for distribution to us but will not be required to be distributed to us by such TRS. We will monitor the value of our interests in the TRS (and any other TRSs that we may form in the future) to ensure compliance with the rule that no more than 20% of the value of our assets may consist of TRS stock and securities (which is applied at the end of each calendar quarter). In addition, we will scrutinize all of our transactions with our TRS (and any other TRSs that we may form in the future) to ensure that they are entered into on arm’s length terms to avoid incurring the 100% excise tax described above. There can be no assurance, however, that we will be able to comply with the TRS limitations or to avoid application of the 100% excise tax discussed above.

The unaudited pro forma condensed consolidated financial data contained in this prospectus supplement is presented for illustrative purposes only and is not necessarily indicative of what our financial position, operating results and other data would have been if the Pro Forma Transactions had actually been completed on the dates indicated and is not intended to project such information for any future date or for any future period, as applicable.

The unaudited pro forma condensed consolidated financial data included in this prospectus supplement was prepared on the basis of assumptions and estimates underlying the adjustments described in the accompanying notes, which are based on available information that we believe to be reasonable. In addition, such unaudited pro forma condensed consolidated financial data does not reflect adjustments for other developments with our business or any acquired or disposed business after September 30, 2018. However, these assumptions may change or may be incorrect, and actual results may differ, perhaps significantly. Therefore, the unaudited pro forma condensed consolidated financial data does not purport to represent what our financial position, operating results and other data would have been if the Pro Forma Transactions had actually been completed on the dates indicated and is not intended to project such information for any future date or for any future period, as applicable. The unaudited pro forma condensed consolidated financial data does not reflect any cost savings, operating synergies or revenue enhancements that the combined company may achieve, the costs necessary to achieve these cost savings, operating synergies and revenue enhancements, or the integration related costs of MGP and the Operating Partnership. For additional information about the basis of presentation of the financial data included in this prospectus supplement, see “Unaudited Pro Forma Condensed Consolidated Financial Data” and the financial statements included or incorporated by reference elsewhere in this prospectus supplement.

Risks related to our business and operations

MGM’s corporate rent net of Operating Partnership distributions coverage ratio described in this prospectus supplement may not be a reliable indicator of its future results.

While the information regarding MGM’s corporate rent net of Operating Partnership distributions coverage ratio was prepared on the basis of assumptions and information that we believe to be reasonable, MGM’s actual results and, as a result our corporate rent net of Operating Partnership distributions coverage ratio, in the future may differ from the historical numbers presented, perhaps significantly, due to numerous factors, including the condition of the gaming markets in the regions in which MGM operates and the amounts of dividends and distributions received by MGM from CityCenter and MGM China.

Management presents a coverage ratio that includes dividends and distributions received by MGM from its joint ventures based on MGM’s ownership in such entities because it believes that this presentation more accurately reflects the cash available to MGM to satisfy its obligations under the Master Lease. Dividends and distributions are made at the discretion of each relevant entity’s board of directors or similar body, and depend on several

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factors, including financial position, results of operations, cash flows, capital requirements, debt covenants and other contractual restrictions, and applicable laws in the respective jurisdiction of each entity’s organization, among others. Accordingly, historical dividends and distributions may not be indicative of future dividends or distributions and should not be relied upon as an indicator of MGM’s corporate rent net of Operating Partnership distributions coverage ratio for future periods.

In addition, in calculating this ratio, management is deducting from rent the distributions received by MGM from MGM’s ownership of Operating Partnership units; however, MGM may use any cash received from these distributions for any lawful purpose, which may not include the payment of rent to the Landlord. As a result, while management believes this presentation will be useful to investors to evaluate the financial strength of MGM, which is MGP’s sole tenant, investors should not put undue reliance on this measure as an indicator of the tenant’s ability to pay rent under the Master Lease.

Further, MGM, its subsidiaries (including MGM China) and CityCenter have a significant amount of outstanding indebtedness, and the cash flow required to service such indebtedness, which is not accounted for in the calculation of MGM’s corporate rent net of Operating Partnership distributions coverage ratio, may impact the amount of actual cash MGM has available to satisfy its obligations under the Master Lease.

Our substantial indebtedness could adversely affect our financial health and prevent us from fulfilling our obligations under our existing debt.

We have a significant amount of indebtedness. As of September 30, 2018, on a pro forma basis as described under “Unaudited Pro Forma Condensed Consolidated Financial Data” and as adjusted for the Notes Offering and the anticipated use of proceeds therefrom and this offering and the anticipated use of proceeds therefrom, we and our subsidiaries on a consolidated basis would have had $5.0 billion principal amount of debt and $1,241.0 million available for borrowing under our Revolving Credit Facility. Our substantial indebtedness could have important consequences to our financial health. For example, it could:

Any of the above listed factors could have a material adverse effect on our business, financial condition and results of operations.

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This offering is not conditioned upon the completion of the Northfield OpCo Disposition, the Empire City Transaction, the Park MGM Lease Transaction or any other transaction, and by participating in this offering, you are investing in us on a stand-alone basis and recognize that we may not consummate the Northfield OpCo Disposition, the Empire City Transaction, the Park MGM Lease Transaction or realize the expected benefits therefrom if we do. In the event that we fail to consummate the Northfield OpCo Disposition, the Empire City Transaction, the Park MGM Lease Transaction or any other transaction described herein, we will have issued a significant amount of additional debt, and we will not have acquired the cash from the Northfield OpCo Disposition, or the increased rent from the Empire City Transaction or the Park MGM Lease Transaction. See “—Risks related to recent and proposed transactions—We may be unable to complete the Northfield OpCo Disposition, the Empire City Transaction or the Park MGM Lease Transaction or may not consummate such transactions on the terms described herein.”

Further, the terms of our existing debt agreements do not, and any future debt may not, fully prohibit us from incurring additional debt. If new debt is added to our current debt levels, the related risks that we now face

could intensify.

Risks related to our Class A shares

An increase in market interest rates could cause potential investors to seek higher returns and therefore reduce demand for our Class A shares and result in a decline in our share price.

One of the factors that may influence the price of our Class A shares is the return on our shares (i.e., the amount of distributions as a percentage of the price of our shares) relative to market interest rates. An increase in market interest rates, which are currently at low levels relative to historical rates, may lead prospective purchasers of our Class A shares to expect a return which we may be unable or choose not to provide. Higher interest rates would likely increase our borrowing costs and potentially decrease the cash available for distribution. Thus, higher market interest rates could cause the market price of our Class A shares to decline.

Our cash available for distribution to shareholders may not be sufficient to continue to make distributions at expected levels, and we may need to borrow in order to make such distributions, make such distributions in the form of shares or may not be able to make such distributions in full.

Distributions that we make will be authorized and determined by our board of directors in its sole discretion out of funds legally available therefor. While we anticipate maintaining relatively stable distribution(s) during each year, the amount, timing and frequency of distributions will be at the sole discretion of the board of directors and will be declared based upon various factors, including, but not limited to: future taxable income, limitations contained in debt instruments, debt service requirements, operating cash inflows and outflows including capital expenditures and acquisitions, if any, to fund distributions and applicable law.

For purposes of satisfying the minimum distribution requirement to qualify for and maintain REIT status, our taxable income will be calculated without reference to our cash flow. Consequently, under certain circumstances, we may not have available cash to pay our required distributions, and we may need to increase our borrowings in order to fund our intended distributions, or we may distribute a portion of our distributions in the form of our Class A shares, which could result in significant shareholder dilution, or in the form of our debt instruments. Pursuant to recent guidance issued by the IRS, certain part-stock and part-cash dividends distributed by publicly-traded REITs will be treated as dividends that satisfy the REIT annual distribution requirement and qualify for the dividends paid deduction for U.S. federal income tax purposes. There is no assurance, however, that we can structure part-stock and part-cash distributions in a manner that meets the requirements of the guidance. Therefore, it is unclear whether and to what extent we will be able to make

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taxable dividends payable in-kind. In addition, to the extent we were to make distributions that include our Class A shares or debt instruments, a shareholder of ours will be required to report dividend income as a result of such distributions even though we distributed no cash or only nominal amounts of cash to such shareholder.

The number of shares available for future sale could adversely affect the market price of our Class A shares.

We cannot predict whether future issuances of our shares or the availability of our Class A shares for resale in the open market will decrease the market price per share of our Class A shares. Sales of a substantial number of our Class A shares in the public market, or the perception that such sales might occur, could adversely affect the market price of our Class A shares. In addition, except as described herein, we, our directors and executive officers and MGM have agreed with the underwriters not to offer, pledge, sell, contract to sell or otherwise transfer or dispose of any shares or securities convertible into or exercisable or exchangeable for our Class A shares for a period of 45 days, after the completion of this offering; however, these lock-up agreements are subject to numerous exceptions and the representatives, on behalf of the underwriters, may waive these lock-up provisions without notice. If any or all of these holders cause a large number of their shares to be sold in the public market, the sales could reduce the trading price of our Class A shares and could impede our ability to raise future capital. In addition, the exercise of the underwriters’ overallotment option to purchase additional Class A shares or other future issuances of our shares would be dilutive to existing shareholders.

If securities or industry press or analysts cease covering our Class A shares, publish negative research or reports about our business, or if they change their recommendations regarding our Class A shares adversely, our Class A share price and trading volume could decline.

The trading market for our Class A shares may be influenced by the articles, research and reports that industry or securities analysts and press publish about us or our business. If one or more of the analysts who cover us downgrade our Class A shares, or if industry press publishes negative articles about our company, our Class A share price would likely decline. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our Class A share price or trading volume to decline.

There may be future sales or other dilution of MGP’s equity, which may adversely affect the market price of the Class A shares. Significant exercises of stock options could adversely affect the market price of our Class A shares.

As of January 28, 2019, there were 70,911,166 Class A shares issued and entitled to vote. In addition, 0.25% of the Company’s authorized Class A shares are issued or issuable pursuant to stock option and employee benefit plans, and as of January 28, 2019, 195,134,123 Class A shares were convertible from Operating Partnership units held by MGM. The sale, or availability for sale, of substantial amounts of our Class A shares in the public market, whether directly by us or resulting from the exercise of options, issuances under employee benefit plans or exchange of the Operating Partnership units held by MGM (and, where applicable, sales pursuant to Rule 144 under the Securities Act), would be dilutive to existing security holders, could adversely affect the prevailing market price of our Class A shares and could impair our ability to raise additional capital through the sale of equity securities.

Except as described under “Underwriting” with respect to the 45-day lock-up, MGP is not restricted from issuing additional Class A shares, including securities that are convertible into or exchangeable for, or that represent the right to receive, Class A shares. The issuance of additional Class A shares will dilute the ownership interest of existing shareholders. Sales of a substantial number of Class A shares or other equity-related securities in

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the public market could depress the market value of the Class A shares, and impair MGP’s ability to raise capital through the sale of additional equity securities. We cannot predict the effect that future sales of the Class A shares or other equity-related securities would have on the market price of the Class A shares.

Sales of the Class A shares in the public market or sales of any of our other securities could dilute ownership and earnings per share, and even the perception that such sales could occur could cause the market price of the Class A shares to decline. The market price of the Class A shares also could decline as a result of sales of the Class A shares made after this offering or the perception that such sales could occur.

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Use of proceeds

We estimate that, based on our closing share price of $30.16 on January 25, 2019, our net proceeds from this offering will be approximately $419.2 million, (or $482.2 million if the underwriters exercise their overallotment option to purchase additional Class A shares in full) after deducting discounts, commissions and estimated offering expenses payable by us.

We intend to use the net proceeds of this offering in part to repay drawings under the Revolving Credit Facility, with the balance for general corporate purposes, including the Empire City Transaction and the Park MGM Lease Transaction. See “Capitalization.”

Any proceeds received in connection with the exercise by the underwriters of their overallotment option to purchase additional shares will be used for general corporate purposes.

Pending application of the net proceeds to us from this offering, we intend to invest such net proceeds temporarily in interest-bearing, short-term investment grade securities, money market accounts or checking accounts, in a manner that is consistent with our intention to maintain our qualification for taxation as a REIT.

Affiliates of certain of the underwriters are lenders and/or agents under the Revolving Credit Facility. We intend to use the net proceeds of this offering to repay revolver draws, and therefore affiliates of certain of the underwriters may receive a portion of the net proceeds from this offering. See “Underwriting.”

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Capitalization

The following table sets forth our cash and cash equivalents and capitalization as of September 30, 2018:

This table should be read in conjunction with “Use of Proceeds” and “Unaudited Pro Forma Condensed Consolidated Financial Data” appearing elsewhere in this prospectus supplement, and in conjunction with MGP’s financial statements and notes thereto and other information incorporated by reference herein. This offering is not conditioned upon the completion of the Northfield OpCo Disposition, the Empire City Transaction, the Park MGM Lease Transaction or any other transaction.

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Unaudited pro forma condensed consolidated financial data

On October 5, 2017, the Operating Partnership completed the MGM National Harbor Transaction pursuant to which MGM National Harbor, LLC, a subsidiary of MGM, assigned its real estate assets to the Operating Partnership in exchange for a combination of cash, the assumption of certain debt from MGM National Harbor and the issuance of Operating Partnership units by the Operating Partnership to MGM National Harbor. The Operating Partnership funded the MGM National Harbor Transaction, in part, with proceeds from the issuance and sale of Operating Partnership units to MGP of approximately $387.5 million on September 11, 2017, as well as the net proceeds of $345.6 million from the issuance of the Operating Partnership’s 2028 Senior Notes on September 21, 2017 (the “MGM National Harbor Financing Transactions”).

On July 6, 2018, the TRS completed the Northfield Acquisition for $1.1 billion. The Operating Partnership funded the Northfield Acquisition with a combination of cash on hand and borrowings under the Operating Partnership’s senior secured credit facility, including a $200.0 million draw on the Operating Partnership’s Term Loan A Facility and a $655.0 million draw under its Revolving Credit Facility.

In 2018, MGP entered into agreements for the Northfield OpCo Disposition, the Empire City Transaction and the Park MGM Lease Transaction. This offering is not conditioned upon the completion of the Northfield OpCo Disposition, the Empire City Transaction, the Park MGM Lease Transaction or any other transaction. See “Prospectus Supplement Summary—Business” in this prospectus supplement for additional information on these transactions.

The unaudited pro forma condensed consolidated financial data was based on, and should be read in conjunction with:

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MGM Growth Properties LLC

Unaudited pro forma condensed consolidated balance sheet

As of September 30, 2018

(in thousands)

See accompanying notes to unaudited pro forma condensed consolidated financial data.

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MGM Growth Properties LLC

Unaudited pro forma condensed consolidated statement of operations

For the year ended December 31, 2017

(in thousands except share and per share amounts)