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Filed Pursuant to Rule 424(B)(5)
Registration No. 333-201924

The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus is not an offer to sell these securities and is not soliciting an offer to buy these securities in any jurisdiction where the offer or sale thereof is not permitted.

SUBJECT TO COMPLETION, DATED MARCH 10, 2015

PRELIMINARY PROSPECTUS SUPPLEMENT

(To Prospectus dated February 25, 2015)

4,000,000 Shares

Common Stock

$     per share

The selling stockholders named in this prospectus supplement are offering 4,000,000 shares of our common stock. Marcus & Millichap, Inc. is not selling any shares of common stock under this prospectus supplement and will not receive any proceeds from the sale of the common stock by the selling stockholders.

One of the selling stockholders has granted the underwriters an option to purchase up to 600,000 additional shares.

Our common stock is listed on the New York Stock Exchange (the “NYSE”) under the symbol “MMI.” On March 9, 2015, the last reported sale price of our common stock on the NYSE was $37.38 per share.

Investing in our common stock involves risks. See “Risk Factors” beginning on page S-13.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares to purchasers on or about                 , 2015 through the book-entry facilities of The Depository Trust Company.

Joint Book-Running Managers

Co-Managers

                    , 2015

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PROSPECTUS SUPPLEMENT

PROSPECTUS

In this prospectus supplement we use the terms “Marcus & Millichap,” “MMI,” “we,” “us,” “our,” and “our company” and similar phrases to refer to Marcus & Millichap, Inc., a Delaware corporation, and its consolidated subsidiaries, unless otherwise specified. References to our “common stock” refer to the common stock, $0.0001 par value per share, of Marcus & Millichap, Inc.

None of us, the selling stockholders, or the underwriters have authorized anyone to provide you with additional or different information from that contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or in any free writing prospectus we may authorize to be delivered to you. The selling stockholders and the underwriters are offering to sell, and seeking offers to buy, our shares only in jurisdictions where offers and sales thereof are permitted. You should assume that the information appearing in this prospectus supplement, the accompanying prospectus or in any free writing prospectus we may authorize to be delivered to you is accurate only as of their respective dates or on the date or dates which are specified in such documents, and that any information in documents that we have incorporated by reference is accurate only as of the date of such document incorporated by reference. Our business, financial condition, liquidity, results of operations and prospects may have changed since those dates.

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This document is in two parts. The first part is this prospectus supplement, which describes the terms of this offering of common stock and also adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus. The second part, the accompanying prospectus dated February 25, 2015, including the documents incorporated by reference therein, provides more general information. Generally, when we refer to this prospectus, we are referring to both parts of this document combined. To the extent there is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained in the accompanying prospectus or in any document incorporated by reference that was filed with the U.S. Securities and Exchange Commission (the “SEC”), before the date of this prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement. If any statement in one of these documents is inconsistent with a statement in another document having a later date (for example, a document incorporated by reference in this prospectus supplement or in the accompanying prospectus) the statement in the document having the later date modifies or supersedes the earlier statement.

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RISK FACTORS

Investing in our common stock involves risks. You should carefully consider the risks and uncertainties described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, which is incorporated by reference herein. You should also carefully consider the other information contained or incorporated by reference in this prospectus supplement and in the accompanying prospectus before acquiring any shares of our common stock. These risks could materially affect our business, results of operations or financial condition and cause the value of our common stock to decline. You could lose all or part of your investment.

FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the documents incorporated by reference include forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends affecting the financial condition of our business. Forward-looking statements should not be read as a guarantee of future performance or results, and will not necessarily be accurate indications of the times at, or by, which such performance or results will be achieved. Forward-looking statements are based on information available at the time those statements are made and/or management’s good faith belief as of that time with respect to future events, and are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements. Important factors that could cause such differences include, but are not limited to:

In addition, in this prospectus supplement, the words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “predict,” “potential” and similar expressions, as they relate to our company, our business and our management, are intended to identify forward-looking statements. In light of these risks and uncertainties, the forward-looking events and circumstances discussed in this prospectus supplement may not occur and actual results could differ materially from those anticipated or implied in the forward-looking statements.

Forward-looking statements speak only as of the date of this prospectus supplement. You should not put undue reliance on any forward-looking statements. We assume no obligation to update forward-looking statements to reflect actual results, changes in assumptions or changes in other factors affecting forward-looking information, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

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USE OF PROCEEDS

We will not receive any proceeds from the sale of shares of our common stock by the selling stockholders, including from any exercise by the underwriters of their option to purchase additional shares.

PRICE RANGE OF SHARES AND DIVIDEND HISTORY

Our common stock has been listed on the NYSE under the symbol “MMI” since October 31, 2013. Prior to that date, there was no public trading market for our common stock. Our initial public offering was priced at $12.00 per share on October 31, 2013. The following table sets forth, for the periods indicated, the high and low sales prices of our shares on the NYSE from and after October 31, 2013:

On March 9, 2015, the last reported sale price of our shares on the NYSE was $37.38 per share.

We do not pay a regular dividend. We will evaluate our dividend policy in the future. Any declaration and payment of future dividends to holders of our common stock will be at the discretion of the board of directors and will depend on many factors, including our financial condition, earnings, cash flows, capital requirements, level of indebtedness, statutory and contractual restrictions applicable to the payment of dividends and other considerations that our board of directors deems relevant.

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PRINCIPAL AND SELLING STOCKHOLDERS

The following table and accompanying footnotes set forth information regarding the beneficial ownership of our common stock as of March 10, 2015, before and after giving effect to this offering (assuming no exercise of the underwriters’ option to purchase additional shares of our common stock from one of the selling stockholders), by (1) each person known to us to beneficially own more than 5% of any class of the outstanding voting securities of Marcus & Millichap, Inc., (2) each of our directors and named executive officers, (3) all of our directors and executive officers as a group and (4) each selling stockholder.

Beneficial ownership is determined in accordance with the rules of the SEC. Percentages are calculated based on 36,918,442 shares outstanding as of March 10, 2015. Except as otherwise noted, the address of each person listed in the table is c/o Marcus & Millichap, Inc., 23975 Park Sorrento, Suite 400, Calabasas, California 91302.

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UNDERWRITING

Citigroup Global Markets Inc., Barclays Capital Inc. and Wells Fargo Securities, LLC are acting as joint book-running managers of the offering and as representatives of the underwriters named below. Subject to the terms and conditions stated in the underwriting agreement dated the date of this prospectus supplement, each underwriter named below has severally agreed to purchase, and the selling stockholders have agreed to sell to that underwriter, the number of shares set forth opposite the underwriter’s name.

The underwriting agreement provides that the obligations of the underwriters to purchase the shares included in this offering are subject to approval of legal matters by counsel and to other conditions. The underwriters are obligated to purchase all the shares (other than those covered by the underwriters’ option to purchase additional shares described below) if they purchase any of the shares.

Shares sold by the underwriters to the public will initially be offered at the public offering price set forth on the cover of this prospectus supplement. Any shares sold by the underwriters to securities dealers may be sold at a discount from the public offering price not to exceed $         per share. If all the shares are not sold at the offering price, the underwriters may change the offering price and the other selling terms.

One of the selling stockholders, Phoenix, has granted to the underwriters an option, exercisable for 30 days from the date of this prospectus supplement, to purchase up to 600,000 additional shares at the public offering price less the underwriting discount. To the extent the option is exercised, each underwriter must purchase a number of additional shares approximately proportionate to that underwriter’s initial purchase commitment. Any shares issued or sold under the option will be issued and sold on the same terms and conditions as the other shares that are the subject of this offering.

We, our officers and directors and the selling stockholders have agreed, subject to certain exceptions, that, for a period of 60 days, or in the case of the selling stockholders, 90 days, from the date of this prospectus supplement, we and they will not, without the prior written consent of Citigroup Global Markets Inc., dispose of or hedge any shares or any securities convertible into or exchangeable for our common stock. Citigroup Global Markets Inc. in its sole discretion may release any of the securities subject to these lock-up agreements at any time without notice. These lock-up agreements do not prohibit the sale of up to 127,500 shares of our common stock by certain of our executive officers pursuant to trading plans established pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or to the sale of up to 21,640 shares of our common stock by one of our other officers.

The shares are listed on the New York Stock Exchange under the symbol “MMI .”

The following table shows the underwriting discounts and commissions that the selling stockholders are to pay to the underwriters in connection with this offering. These amounts are shown assuming both no exercise and full exercise of the underwriters’ option to purchase additional shares.

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The selling stockholders will pay all of their and our third party expenses in connection with this offering, which are estimated to be approximately $450,000. The selling stockholders have also agreed to reimburse the underwriters for certain of their expenses in an amount up to $15,000.

In connection with the offering, the underwriters may purchase and sell shares in the open market. Purchases and sales in the open market may include short sales, purchases to cover short positions, which may include purchases pursuant to the underwriters’ option to purchase additional shares, and stabilizing purchases.

Purchases to cover short positions and stabilizing purchases, as well as other purchases by the underwriters for their own accounts, may have the effect of preventing or retarding a decline in the market price of the shares. They may also cause the price of the shares to be higher than the price that would otherwise exist in the open market in the absence of these transactions. The underwriters may conduct these transactions on the New York Stock Exchange, in the over-the-counter market or otherwise. If the underwriters commence any of these transactions, they may discontinue them at any time.

Conflicts of Interest

The underwriters are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, principal investment, hedging, financing and brokerage activities. The underwriters and their respective affiliates have in the past performed commercial banking, investment banking and advisory services for us from time to time for which they have received customary fees and reimbursement of expenses and may, from time to time, engage in transactions with and perform services for us in the ordinary course of their business for which they may receive customary fees and reimbursement of expenses. In the ordinary course of their various business activities, the underwriters and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (which may include bank loans and/or credit default swaps) for their own account and for the accounts of their customers and may at any time hold long and short positions in such securities and instruments. Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. In addition, an affiliate of Wells Fargo Securities,

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LLC is the sole lender under our credit facility. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

We and the selling stockholders have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make because of any of those liabilities.

Notice to Prospective Investors in the European Economic Area

In relation to each member state of the European Economic Area that has implemented the Prospectus Directive (each, a relevant member state), with effect from and including the date on which the Prospectus Directive is implemented in that relevant member state (the relevant implementation date), an offer of shares described in this prospectus supplement may not be made to the public in that relevant member state other than:

provided that no such offer of shares shall require us or any underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Directive.

For purposes of this provision, the expression an “offer of securities to the public” in any relevant member state means the communication in any form and by any means of sufficient information on the terms of the offer and the shares to be offered so as to enable an investor to decide to purchase or subscribe for the shares, as the expression may be varied in that member state by any measure implementing the Prospectus Directive in that member state, and the expression “Prospectus Directive” means Directive 2003/71/EC (and amendments thereto, including the 2010 PD Amending Directive, to the extent implemented in the relevant member state) and includes any relevant implementing measure in the relevant member state. The expression 2010 PD Amending Directive means Directive 2010/73/EU.

The sellers of the shares have not authorized and do not authorize the making of any offer of shares through any financial intermediary on their behalf, other than offers made by the underwriters with a view to the final placement of the shares as contemplated in this prospectus supplement. Accordingly, no purchaser of the shares, other than the underwriters, is authorized to make any further offer of the shares on behalf of the sellers or the underwriters.

Notice to Prospective Investors in the United Kingdom

This prospectus supplement and the accompanying prospectus are only being distributed to, and are only directed at, persons in the United Kingdom that are qualified investors within the meaning of Article 2(1)(e) of the Prospectus Directive that are also (i) investment professionals falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the “Order”) or (ii) high net worth entities, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order (each such person being referred to as a “relevant person”). This prospectus supplement and its contents are confidential and should not be distributed, published or reproduced (in whole or in part) or disclosed by recipients to any other persons in the United Kingdom. Any person in the United Kingdom that is not a relevant person should not act or rely on this document or any of its contents.

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Notice to Prospective Investors in France

Neither this prospectus supplement nor any other offering material relating to the shares described in this prospectus supplement has been submitted to the clearance procedures of the Autorité des Marchés Financiers or of the competent authority of another member state of the European Economic Area and notified to the Autorité des Marchés Financiers. The shares have not been offered or sold and will not be offered or sold, directly or indirectly, to the public in France. Neither this prospectus supplement nor any other offering material relating to the shares has been or will be:

Such offers, sales and distributions will be made in France only:

The shares may be resold directly or indirectly, only in compliance with articles L.411-1, L.411-2, L.412-1 and L.621-8 through L.621-8-3 of the French Code monétaire et financier.

Notice to Prospective Investors in Switzerland

The shares of common stock may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (“SIX”) or on any other stock exchange or regulated trading facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other offering or marketing material relating to the shares of common stock or the offering may be publicly distributed or otherwise made publicly available in Switzerland. Neither this document nor any other offering or marketing material relating to the offering, the issuer or the shares of common stock has been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the offer of the shares of common stock will not be supervised by, the Swiss Financial Market Supervisory Authority, and the offer of shares of common stock has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes (the “CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of shares of common stock.

Notice to Prospective Investors in Hong Kong

The shares may not be offered or sold in Hong Kong by means of any document other than (i) in circumstances which do not constitute an offer to the public within the meaning of the Companies Ordinance (Cap. 32, Laws of Hong Kong), or (ii) to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder, or (iii) in other circumstances which do not result in the document being a “prospectus” within the meaning of the Companies Ordinance (Cap. 32, Laws of Hong Kong) and no advertisement, invitation or document relating to the shares may be issued or

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may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the laws of Hong Kong) other than with respect to shares which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder.

Notice to Prospective Investors in Japan

The shares offered in this prospectus supplement have not been and will not be registered under the Financial Instruments and Exchange Law of Japan. The shares have not been offered or sold and will not be offered or sold, directly or indirectly, in Japan or to or for the account of any resident of Japan (including any corporation or other entity organized under the laws of Japan), except (i) pursuant to an exemption from the registration requirements of the Financial Instruments and Exchange Law and (ii) in compliance with any other applicable requirements of Japanese law.

Notice to Prospective Investors in Singapore

This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the shares may not be circulated or distributed, nor may the shares be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor under Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”), (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to Section 275(1A), and in accordance with the conditions specified in Section 275 of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA, in each case subject to compliance with conditions set forth in the SFA.

Where the shares are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

shares, debentures and units of shares and debentures of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the shares pursuant to an offer made under Section 275 of the SFA except:

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Notice to Prospective Investors in Australia

No prospectus or other disclosure document (as defined in the Corporations Act 2001 (Cth) of Australia (“Corporations Act”)) in relation to the common shares has been or will be lodged with the Australian Securities & Investments Commission (“ASIC”). This document has not been lodged with ASIC and is only directed to certain categories of exempt persons. Accordingly, if you receive this document in Australia:

Notice to Prospective Investors in Chile

The shares are not registered in the Securities Registry (Registro de Valores) or subject to the control of the Chilean Securities and Exchange Commission (Superintendencia de Valores y Seguros de Chile). This prospectus supplement and other offering materials relating to the offer of the shares do not constitute a public offer of, or an invitation to subscribe for or purchase, the shares in the Republic of Chile, other than to individually identified purchasers pursuant to a private offering within the meaning of Article 4 of the Chilean Securities Market Act (Ley de Mercado de Valores) (an offer that is not “addressed to the public at large or to a certain sector or specific group of the public”).

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LEGAL MATTERS

The validity of the shares of common stock offered hereunder will be passed upon for the selling stockholders by Orrick, Herrington & Sutcliffe LLP, San Francisco, California. Certain legal matters will be passed upon for the underwriters by Latham & Watkins LLP, Los Angeles, California.

EXPERTS

The consolidated financial statements of Marcus & Millichap, Inc. appearing in Marcus & Millichap, Inc.’s Annual Report (Form 10-K) for the year ended December 31, 2014 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such report given on the authority of such firm as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

We have filed with the SEC a registration statement on Form S-3 under the Securities Act of 1933, as amended with respect to the shares of common stock offered by this prospectus supplement. This prospectus supplement and the accompanying prospectus, and any document incorporated by reference into this prospectus supplement and the accompanying prospectus, filed as part of the registration statement, does not contain all of the information set forth in the registration statement and its exhibits and schedules, portions of which have been omitted as permitted by the rules and regulations of the SEC. For further information about us and shares of our common stock, we refer you to the registration statement and to its exhibits. Statements in this prospectus supplement and the accompanying prospectus about the contents of any contract, agreement or other document are not necessarily complete and in each instance we refer you to the copy of such contract, agreement or document filed as an exhibit to the registration statement, which each such statement being qualified in all respects by reference to the document to which it refers.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. You can also inspect, read, and copy these reports, proxy statements and other information at the public reference facilities the SEC maintains at:

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

You can also obtain copies of these materials from the public reference facilities of the SEC at prescribed rates. You can obtain information on the operation of the public reference facilities by calling the SEC at 1-800-SEC-0330. Our SEC filings are also available over the Internet at the SEC’s website at http://www.sec.gov, which contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

You may also obtain information about us at our Internet website at http://www.marcusmillichap.com. However, the information on our website does not constitute a part of this prospectus supplement.

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CERTAIN DOCUMENTS INCORPORATED BY REFERENCE

In this document, we “incorporate by reference” the information we file with the SEC, which means that we can disclose important information to you by referring to that information. The information incorporated by reference is considered to be a part of this prospectus supplement, and later information filed with the SEC will update and supersede this information. Notwithstanding this statement, however, you may rely on information that has been filed at the time you made your investment decision. We incorporate by reference the documents listed below:

We also incorporate by reference all future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or (1) after the date of the filing of the registration statement containing this prospectus supplement and prior to the effectiveness of such registration statement and (2) after the date of this prospectus supplement and prior to the termination of any offering made hereby.

You may request a copy of these filings, at no cost, by writing or telephoning us at the following address or phone number:

Marcus & Millichap, Inc.

23975 Park Sorrento, Suite 400

Calabasas, CA 91302

Attention: Chief Financial Officer

Telephone: (818) 212-2250

You should rely only on the information provided in this document or incorporated in this document by reference. We have not authorized anyone to provide you with different information. You should not assume that the information in this document, including any information incorporated herein by reference, is accurate as of any date other than that on the front of the document. Any statement incorporated herein shall be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement.

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PROSPECTUS

4,600,000 Shares

Common Stock

Phoenix Investments Holdings LLC (“Phoenix Investments”) and George M. Marcus, our Co-Chairman (together with Phoenix Investments, the “selling stockholders”) may offer and sell up to 4,600,000 shares of our common stock from time to time, in amounts, at prices and on terms that will be determined at the time these shares of common stock are offered. We are not selling any shares of common stock under this prospectus and will not receive any proceeds from the sale of shares by the selling stockholders.

We will provide more specific terms regarding any offering of the shares of common stock in supplements to this prospectus or in one or more documents incorporated by reference into this prospectus. The prospectus supplements and documents incorporated by reference into this prospectus may also add, update or change information contained in this prospectus. You should read this prospectus, including any documents incorporated by reference into this prospectus, and the applicable prospectus supplement carefully before you invest.

The selling stockholders may sell all or a portion of the shares directly to purchasers or through underwriters, brokers-dealers or agents, who may receive compensation in the form of discounts, concessions or commissions. These sales may occur at fixed prices, at market prices prevailing at the time of sale, at prices related to prevailing market price, at varying prices determined at the time of sale or at negotiated prices. See the section titled “Plan of Distribution” in this prospectus for a more complete description of the ways in which the shares may be sold.

Our common stock is listed on the New York Stock Exchange (the “NYSE”) under the symbol “MMI.” On February 5, 2015, the last reported sale price of our common stock on the NYSE was $36.66 per share.

Investing in our common stock involves risks. You should carefully consider the risk factors set forth in the applicable supplement to this prospectus, and under similar headings in the other documents that are incorporated by reference into this prospectus or any prospectus supplement before investing in any common stock that may be offered. See “Risk Factors” on page 1.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or the accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is February 25, 2015

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You should rely only on the information contained or incorporated by reference in this prospectus and any applicable prospectus supplement. Neither we nor the selling stockholders have authorized any other person to provide you with different or additional information. If anyone provides you with different or additional information, you should not rely on it. You should assume that the information contained or incorporated by reference in this prospectus is accurate as of the date on the front cover of this prospectus or the date of the document incorporated by reference. Our business, financial condition, results of operations and prospects may have changed since then. The selling stockholders are not making an offer to sell the securities offered by this prospectus in any jurisdiction where the offer or sale is not permitted.

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MARCUS & MILLICHAP, INC.

Marcus & Millichap is a leading national brokerage firm specializing in commercial real estate investment sales, financing, research and advisory services. We have been the top broker in the United States based on the number of investment transactions over the last 10 years. As of December 31, 2014, we had nearly 1,500 investment sales and financing professionals in 78 offices that provide investment brokerage and financing services to sellers and buyers of commercial real estate. We also offer market research, consulting and advisory services to developers, lenders, owners and investors.

We were formed as a sole proprietorship in 1971, incorporated in California on August 26, 1976 as G. M. Marcus & Company, and we were renamed as Marcus & Millichap, Inc. in August 1978, Marcus & Millichap Real Estate Investment Brokerage Company in September 1985, and Marcus & Millichap Real Estate Investment Services, Inc. (“MMREIS”) in February 2007. Prior to the completion of our initial public offering (“IPO”), MMREIS was majority-owned by Marcus & Millichap Company (“MMC”) and all of MMREIS’ preferred and common stock outstanding was held by MMC and its affiliates or officers and employees of MMREIS. In June 2013, in preparation for the spin-off of its real estate investment services business (the “Spin-Off”), MMC formed a holding company called Marcus & Millichap, Inc. in Delaware. Prior to the completion of our IPO, the shareholders of MMREIS contributed the shares of MMREIS to Marcus & Millichap, Inc. in exchange for common stock of Marcus & Millichap, Inc., and MMREIS became a wholly owned subsidiary of Marcus & Millichap, Inc.

Our principal executive offices are located at 23975 Park Sorrento, Suite 400, Calabasas, California 91302. Our telephone number at this location is (818) 212-2250. Our website address is www.marcusmillichap.com. The information on our website is not part of, and is not incorporated into, this prospectus or any prospectus supplement.

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement on Form S-3 that we filed with the SEC using a shelf registration process. Under this shelf registration process, the selling stockholders may, from time to time, offer and sell up to 4,600,000 shares of our common stock in one or more offerings or resales. This prospectus provides you with a general description of the shares of our common stock such stockholders may sell. Each time the selling stockholders sell shares under this prospectus, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in or incorporated by reference into this prospectus. If so, the information in the prospectus supplement should be read as superseding the information in this prospectus. Additionally, information that we file later with the SEC will automatically update and supersede this information. You should carefully read this prospectus, the applicable prospectus supplement, and the additional information described below under the headings “Where You Can Find More Information” and “Certain Documents Incorporated By Reference.”

In this prospectus we use the terms “Marcus & Millichap,” “we,” “us,” “our,” and “our company” and similar phrases to refer to Marcus & Millichap, Inc., a Delaware corporation, and its consolidated subsidiaries, unless otherwise specified.

RISK FACTORS

Investing in the common stock to be offered pursuant to this prospectus may involve a high degree of risk. These risks will be set forth in a prospectus supplement relating to the common stock to be offered by that prospectus supplement. You should carefully consider the important factors set forth under the heading “Risk Factors” in the applicable supplement to this prospectus before investing in any common stock that may be offered.

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FORWARD-LOOKING STATEMENTS

This prospectus includes forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends affecting the financial condition of our business. Forward-looking statements should not be read as a guarantee of future performance or results, and will not necessarily be accurate indications of the times at, or by, which such performance or results will be achieved. Forward-looking statements are based on information available at the time those statements are made and/or management’s good faith belief as of that time with respect to future events, and are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements. Important factors that could cause such differences include, but are not limited to:

In addition, in this prospectus, the words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “predict,” “potential” and similar expressions, as they relate to our company, our business and our management, are intended to identify forward-looking statements. In light of these risks and uncertainties, the forward-looking events and circumstances discussed in this prospectus may not occur and actual results could differ materially from those anticipated or implied in the forward-looking statements.

Forward-looking statements speak only as of the date of this prospectus. You should not put undue reliance on any forward-looking statements. We assume no obligation to update forward-looking statements to reflect actual results, changes in assumptions or changes in other factors affecting forward-looking information, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

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USE OF PROCEEDS

This prospectus relates to shares of our common stock that may be offered and sold from time to time by the selling stockholders. We will receive no proceeds from the sale of common stock by the selling stockholders. The selling stockholders will pay all third party expenses relating to any offering.

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DESCRIPTION OF CAPITAL STOCK

As of the date of this prospectus, our authorized capital stock consists of 175,000,000 shares, of which 150,000,000 shares, par value $0.0001 per share, are designated as common stock, and 25,000,000 shares, par value $0.0001 per share, are designated as preferred stock. As of December 31, 2014, there were 36,918,442 shares of common stock outstanding, and there were approximately 21 holders of record of our common stock. No shares of preferred stock are currently outstanding.

The following description of our capital stock does not purport to be complete and is subject to and is qualified in its entirety by the description of our capital stock contained in our amended and restated certificate of incorporation, a copy of which is filed as an exhibit to the registration statement of which this prospectus is a part. Reference is made to such exhibit for a detailed description of the provisions thereof summarized below.

Common Stock

The holders of our common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders. Subject to preferences that may be applicable to any then outstanding preferred stock, holders of common stock are entitled to receive ratably such dividends, if any, as may be declared by the board of directors out of funds legally available for that purpose. In the event of liquidation, dissolution or winding up of the company, the holders of common stock will be entitled to share ratably in the net assets legally available for distribution to stockholders after the payment of all of our debts and other liabilities of our company, subject to the prior distribution rights of any preferred stock then outstanding. Holders of common stock have no preemptive or conversion rights or other subscription rights. All outstanding shares of common stock, including the shares of common stock to be issued pursuant to this prospectus, are fully paid and non-assessable.

Certain Effects of Authorized but Unissued Stock

We have shares of common stock and preferred stock available for future issuance without stockholder approval. These additional shares may be used for a variety of corporate purposes, including future public offerings to raise additional capital, to facilitate corporate acquisitions or to pay as a dividend on the capital stock.

The existence of unissued and unreserved common stock and preferred stock may enable our board of directors to issue shares to persons friendly to current management or to issue preferred stock with terms that could render more difficult or discourage an attempt to obtain control of us by means of a merger, tender offer, proxy contest or otherwise, thereby protecting the continuity of our management. In addition, the issuance of preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders would receive dividend payments and payments upon liquidation.

Anti-Takeover Effects of Delaware Law and Our Certificate of Incorporation and Bylaws

Our amended and restated certificate of incorporation and our amended and restated bylaws contain certain provisions that could have the effect of delaying, deterring or preventing another party from acquiring control of us. These provisions and certain provisions of the General Corporation Law of the State of Delaware (the “DGCL”), which are summarized below, are expected to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to negotiate first with our board of directors. We believe that the benefits of increased protection of our potential ability to negotiate more favorable terms with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging a proposal to acquire us.

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Undesignated Preferred Stock

Our board of directors has the ability to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to change control of us. These and other provisions may have the effect of deterring hostile takeovers or delaying changes in control or management of our company.

Limits on Ability of Stockholders to Act by Written Consent or Call a Special Meeting

Our amended and restated certificate of incorporation provides that our stockholders may not act by written consent, which may lengthen the amount of time required to take stockholder actions. As a result, a holder controlling a majority of our capital stock would not be able to amend our bylaws or remove directors without holding a meeting of our stockholders called in accordance with our bylaws.

In addition, our amended and restated bylaws provide that special meetings of the stockholders may be called only by the chairperson of the board, the Chief Executive Officer or our board of directors. Stockholders may not call a special meeting, which may delay the ability of our stockholders to force consideration of a proposal or for holders controlling a majority of our capital stock to take any action, including the removal of directors.

Requirements for Advance Notification of Stockholder Nominations and Proposals

Our amended and restated bylaws establish advance notice procedures with respect to stockholder proposals and the nomination of candidates for election as directors, other than nominations made by or at the direction of our board of directors or a committee of our board of directors. These provisions may have the effect of precluding the conduct of certain business at a meeting if the proper procedures are not followed. These provisions may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our company.

Board Classification

Our board of directors is divided into three classes, one class of which is elected each year by our stockholders. The directors in each class serve three-year terms. A third party may be discouraged from making a tender offer or otherwise attempting to obtain control of us as it is it more difficult and time-consuming for stockholders to replace a majority of the directors on a classified board.

No Cumulative Voting

Our amended and restated certificate of incorporation and amended and restated bylaws do not permit cumulative voting in the election of directors. Cumulative voting allows a stockholder to vote a portion or all of its shares for one or more candidates for seats on the board of directors. Without cumulative voting, a minority stockholder may not be able to gain as many seats on our board of directors as the stockholder would be able to gain if cumulative voting were permitted. The absence of cumulative voting makes it more difficult for a minority stockholder to gain a seat on our board of directors to influence our board’s decision regarding a takeover.

Amendment of Charter and Bylaws Provisions

The amendment of the above provisions of our amended and restated certificate of incorporation requires the approval by holders of at least two thirds of our outstanding capital stock entitled to vote generally in the election of directors. The amendment of our bylaws requires approval by the holders of at least two thirds of our outstanding capital stock entitled to vote generally in the election of directors.

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Delaware Anti-Takeover Statute

We are subject to Section 203 of the DGCL regulating corporate takeovers. In general, Section 203 prohibits a publicly held Delaware corporation from engaging, under certain circumstances, in a business combination with an interested stockholder for a period of three years following the date the person became an interested stockholder unless:

Generally, a business combination includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. An interested stockholder is a person who, together with affiliates and associates, owns or, within three years prior to the determination of interested stockholder status, did own 15% or more of a corporation’s outstanding voting stock. We expect the existence of this provision to have an anti-takeover effect with respect to transactions our board of directors does not approve in advance. We anticipate that Section 203 may also discourage attempts that might result in a premium over the market price for the shares of common stock held by stockholders.

The provisions of the DGCL and the provisions of our amended and restated certificate of incorporation and amended and restated bylaws could have the effect of discouraging others from attempting hostile takeovers and, as a consequence, they might also inhibit temporary fluctuations in the market price of our common stock that often result from actual or rumored hostile takeover attempts. These provisions might also have the effect of preventing changes in our management. It is possible that these provisions could make it more difficult to accomplish transactions that stockholders might otherwise deem to be in their best interests.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company, LLC, 6201 15^th Avenue, Brooklyn, NY 11219. Its phone number is (800) 937-5449.

Listing

Our common stock is listed on the New York Stock Exchange under the symbol “MMI.”

SELLING STOCKHOLDERS

This prospectus relates to the resale or other disposition by Phoenix Investments and George M. Marcus of up to 4,600,000 shares of our common stock. In connection with our IPO in 2013, MMC contributed its shares of MMREIS to Marcus & Millichap in exchange for common stock of Marcus & Millichap, and MMREIS became a wholly owned subsidiary of Marcus & Millichap. MMC subsequently distributed its shares in Marcus & Millichap to its shareholders, including Mr. Marcus, who then contributed those shares to Phoenix Investments. In February 2015, Phoenix Investments made a pro rata distribution to its members of a portion of its shares of Marcus & Millichap, pursuant to which Mr. Marcus received 800,000 shares of Marcus & Millichap being registered hereunder.

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Information about the selling stockholders, where applicable, including the amount of shares of common stock owned by each selling stockholder prior to the offering, the number of shares of our common stock to be offered by each selling stockholder and the amount of common stock to be owned by each selling stockholder after completion of the offering, will be set forth in an applicable prospectus supplement, documents incorporated by reference or in a free writing prospectus we file with the SEC. The applicable prospectus supplement will also disclose whether any of the selling stockholders has held any position or office with, has been employed by or otherwise has had a material relationship with us during the three years prior to the date of the prospectus supplement.

The selling stockholders may transfer the shares of common stock in other circumstances, including, but not limited to, transfers by Mr. Marcus to his family charitable foundation, The Marcus Family Foundation, in which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus and may sell the shares from time to time under this prospectus after we have filed an update to this prospectus under Rule 424(b) or other applicable provision of the Securities Act of 1933, as amended (the “Securities Act”) amending the list of selling stockholders to include the pledgee, transferee or other successors in interest as selling stockholders under this prospectus. The selling stockholders also may transfer and donate the shares in other circumstances in which case the transferees, donees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus.

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PLAN OF DISTRIBUTION

The selling stockholders, including any transferees, donees, pledgees, assignees and successors-in-interest, may, from time to time, sell, transfer or otherwise dispose of the shares:

We will describe in a prospectus supplement, the particular terms of the offering of the shares, including the following:

If the selling stockholders use underwriters in the sale, such underwriters will acquire the shares for their own account. The underwriters may resell the shares in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale.

The shares may be either offered to the public through underwriting syndicates represented by managing underwriters or by underwriters without a syndicate. The obligations of the underwriters to purchase the shares will be subject to certain conditions. The underwriters will be obligated to purchase all the shares of the series offered if any of the shares are purchased. The underwriters may change from time to time the offering price and any discounts or concessions allowed or reallowed or paid to dealers.

The selling stockholders may sell offered shares through agents designated by the selling stockholders. Any agent involved in the offer or sale of the shares for which this prospectus is delivered will be named, and any commissions payable by the selling stockholders to that agent will be set forth, in the prospectus supplement. Unless indicated in the prospectus supplement, the agents have agreed to use their reasonable best efforts to solicit purchases for the period of their appointment.

The selling stockholders also may sell offered shares directly. In this case, no underwriters or agents would be involved.

Underwriters, dealers and agents that participate in the distribution of the offered shares may be underwriters as defined in the Securities Act, and any discounts or commissions received by them from the selling stockholders and any profit on the resale of the offered shares by them may be treated as underwriting discounts and commissions under the Securities Act. We will identify any underwriters or agents, and describe their compensation, in a prospectus supplement.

Certain of any such underwriters and agents, including their associates, may be customers of, engage in transactions with and perform services for us and our subsidiaries in the ordinary course of business. One or more of our affiliates may from time to time act as an agent or underwriter in connection with the sale of the shares to the extent permitted by applicable law. The participation of any such affiliate in the offer and sale of the shares will comply with Rule 5110(h) of the Corporate Financing Rule of the Financial Industry Regulatory Authority regarding the offer and sale of securities of an affiliate.

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The selling stockholders may have agreements with the underwriters, dealers and agents to indemnify them against certain civil liabilities, including liabilities under the Securities Act, or to contribute with respect to payments which the underwriters, dealers or agents may be required to make. Underwriters, dealers and agents may engage in transactions with, or perform services for, us or our subsidiaries in the ordinary course of their businesses.

The selling stockholders may authorize agents or underwriters to solicit offers by certain types of institutions to purchase shares from them at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts. These contracts will provide for payment and delivery on a specified date in the future. The conditions to these contracts and the commissions payable for solicitation of such contracts will be set forth in the applicable prospectus supplement.

In order to facilitate the offering of the shares, any underwriters or agents, as the case may be, involved in the offering of such shares may engage in transactions that stabilize, maintain or otherwise affect the price of such shares or any other securities the prices of which may be used to determine payments on such securities. Specifically, the underwriters or agents, as the case may be, may overallot in connection with the offering, creating a short position in such securities for their own account. In addition, to cover overallotments or to stabilize the price of such securities or any such other securities, the underwriters or agents, as the case may be, may bid for, and purchase, such securities or any such other securities in the open market. Finally, in any offering of such securities through a syndicate of underwriters, the underwriting syndicate may reclaim selling concessions allotted to an underwriter or a dealer for distributing such securities in the offering if the syndicate repurchases previously distributed securities in transactions to cover syndicate short positions, in stabilization transaction or otherwise. Any of these activities may stabilize or maintain the market price of the securities above independent market levels. The underwriters or agents, as the case may be, are not required to engage in these activities, and may end any of these activities at any time.

The selling stockholders also may transfer the shares of common stock in other circumstances, including, but not limited to, transfers by George M. Marcus to his family charitable foundation, The Marcus Family Foundation, in which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus and may sell the shares from time to time under this prospectus after we have filed an update to this prospectus under Rule 424(b) or other applicable provisions of the Securities Act amending the list of selling stockholders to include the pledgee, transferee or other successors in interest as selling stockholders under this prospectus. The selling stockholders also may transfer and donate the shares in other circumstances in which case the transferees, donees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus.

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VALIDITY OF THE SECURITIES

The validity of the shares of common stock offered hereunder will be passed upon for the selling stockholders by Orrick, Herrington & Sutcliffe LLP, San Francisco, California.

EXPERTS

The consolidated financial statements of Marcus & Millichap, Inc. and Subsidiaries appearing in Marcus & Millichap, Inc.’s Annual Report (Form 10-K) for the year ended December 31, 2013 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such report given on the authority of such firm as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC. You can also inspect, read, and copy these reports, proxy statements and other information at the public reference facilities the SEC maintains at:

The Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

You can also obtain copies of these materials from the public reference facilities of the SEC at prescribed rates. You can obtain information on the operation of the public reference facilities by calling the SEC at 1-800-SEC-0330. Our SEC filings are also available over the Internet at the SEC’s website at http://www.sec.gov, which contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

You may also obtain information about us at our Internet website at http://www.marcusmillichap.com. However, the information on our website does not constitute a part of this prospectus.

CERTAIN DOCUMENTS INCORPORATED BY REFERENCE

In this document, we “incorporate by reference” the information we file with the SEC, which means that we can disclose important information to you by referring to that information. The information incorporated by reference is considered to be a part of this prospectus, and later information filed with the SEC will update and supersede this information. Notwithstanding this statement, however, you may rely on information that has been filed at the time you made your investment decision. We incorporate by reference the documents listed below:

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We also incorporate by reference all future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”) on or (1) after the date of the filing of the registration statement containing this prospectus and prior to the effectiveness of such registration statement and (2) after the date of this prospectus and prior to the termination of any offering made hereby.

You may request a copy of these filings, at no cost, by writing or telephoning us at the following address or phone number:

Marcus & Millichap, Inc.

23975 Park Sorrento, Suite 400

Calabasas, CA 91302

Attention: Chief Financial Officer

Telephone: (818) 212-2250

You should rely only on the information provided in this document or incorporated in this document by reference. We have not authorized anyone to provide you with different information. You should not assume that the information in this document, including any information incorporated herein by reference, is accurate as of any date other than that on the front of the document. Any statement incorporated herein shall be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

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4,000,000 Shares

Common Stock

PRELIMINARY PROSPECTUS SUPPLEMENT

                    , 2015

Citigroup

Barclays

Wells Fargo Securities

William Blair

JMP Securities