Filed pursuant to Rule 424(b)(5)
Registration No. 333-282975

PROSPECTUS SUPPLEMENT

(To Prospectus dated November 4, 2024)

$400,000,000

Watsco, Inc.

Common stock

We have entered into a third amended and restated sales agreement, dated May 3, 2024, which we refer to as the third amended and restated sales agreement, with Robert W. Baird & Co. Incorporated, referred to as Baird or the agent, relating to the issuance and sale, from time to time through the agent, of shares of our Common stock, par value $0.50 per share, referred to as the Common stock, offered by this prospectus supplement and the accompanying prospectus. In accordance with the terms of the sales agreement, we may offer and sell shares of our Common stock having an aggregate gross sales price of up to $400,000,000 from time to time through the agent.

Sales of shares of our Common stock, if any, under this prospectus supplement and the accompanying prospectus may be made in negotiated transactions or transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, as amended, referred to as the Securities Act, including sales made directly on the New York Stock Exchange, or the NYSE, or sales made to or through a market maker other than on an exchange. Subject to the terms and conditions of the sales agreement, the agent will use its commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares of Common stock on our behalf, on mutually agreed terms between the agent and us.

The agent will receive from us a commission or discount of up to 2.0% of the gross sales price of all shares sold through it under the sales agreement. In connection with the sale of the shares of Common stock on our behalf, the agent may be deemed to be an “underwriter” within the meaning of the Securities Act, and the agent’s compensation may be deemed to be underwriting commissions or discounts.

Our Common stock is listed on the New York Stock Exchange under the ticker symbol “WSO.” On October 29, 2024, the last reported sale price for our Common stock was $473.47 per share.

Investing in our securities involves risks. See “Risk Factors” beginning on page S-3 of this prospectus supplement.

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.

Baird

Prospectus supplement dated November 4, 2024.

TABLE OF CONTENTS

PAGE

Prospectus Supplement

Prospectus

S-i

ABOUT THIS PROSPECTUS SUPPLEMENT

We are providing information to you about this offering in two parts. The first part is this prospectus supplement, which provides the specific details regarding this offering. The second part is the accompanying base prospectus, which provides general information. Generally, when we refer to this “prospectus,” we are referring to both documents combined. Some of the information in the base prospectus may not apply to this offering. If information in this prospectus supplement is inconsistent with the accompanying base prospectus, you should rely on this prospectus supplement.

You should rely only on the information contained in, or incorporated by reference in, this prospectus supplement, the accompanying prospectus and any free writing prospectus related to this offering prepared by us or on our behalf or otherwise authorized by us. We have not, and the agent has not, authorized anyone to provide you with different information, and if anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information contained in this prospectus supplement, the accompanying prospectus, any free writing prospectus and the documents incorporated by reference herein and therein is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed since those dates.

References in this prospectus supplement to the “Registrant,” “Watsco,” “we,” “us,” and “our” refer to Watsco, Inc., a Florida corporation, and its subsidiaries, unless the context requires otherwise.

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INDUSTRY AND MARKET DATA

Some market data and other statistical information presented or incorporated by reference in this prospectus supplement are based on data from various independent third-party sources, including independent industry publications, reports by market research firms and other independent sources. Other data is based on management’s estimates and calculations, which are derived from our review and interpretation of internal analyses, as well as third-party sources. Although we believe these third-party sources are reliable, we have not independently verified any information and cannot guarantee its accuracy and completeness. To the extent that we have been unable to obtain information from third-party sources, we have expressed our belief on the basis of our own internal analyses of our products and capabilities in comparison to our competitors.

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RISK FACTORS

Investing in our Common stock involves a high degree of risk. You should consider carefully the risks and uncertainties described below, the risks described under the heading “Risk Factors” in Item 1A of Part I of our most recent Annual Report and in the accompanying prospectus and other information contained in or incorporated by reference in this prospectus supplement and the accompanying prospectus, including our audited consolidated financial statements and the related notes, before you decide whether to purchase our Common stock. If any of the following risks actually occur, our business, financial condition, results of operations, cash flow and prospects could be materially and adversely affected. As a result, the trading price of our Common stock could decline and you could lose all or part of your investment in our Common stock.

Risks Related to this Offering and Ownership of Our Common Stock

Future Sales

In accordance with the terms of the third amended and restated sales agreement, we may offer and sell shares of our Common stock having an aggregate gross sales price of up to $400,000,000 from time to time. This offering may have a dilutive effect on our earnings per share and the effect of depressing the market price for shares of our Common stock. Additionally, we are not restricted from issuing additional shares of our Common stock, including securities that are convertible into or exchangeable for, or that represent the right to receive, our Common stock or any substantially similar securities in the future. We may also issue our securities in connection with investments or acquisitions. The number of shares of our Common stock issued in connection with an investment or acquisition could constitute a material portion of our then-outstanding shares of our Common stock. Any issuance of securities in connection with investments or acquisitions may result in dilution to you.

Volatility

The market price of our Common stock may be highly volatile and could be subject to wide fluctuations. Securities markets worldwide experience significant price and volume fluctuations. This market volatility, as well as general economic, market or political conditions, could reduce the market price of shares of our Common stock despite our operating performance. The trading price of our Common stock may be adversely affected due to many factors, most of which we cannot predict or control, such as the following:

Trading Liquidity

The trading market for our Common stock is limited, and there can be no assurance that a more liquid trading market for our Common stock will develop. There can be no assurance as to the liquidity of any market for our Common stock, the ability of the holders of our Common stock to sell any of their securities and the price at which the holders of our Common stock will be able to sell such securities.

Payment of Dividends

The amount of any future dividends that we will pay, if any, will depend upon a number of factors. Future dividends will be declared and paid at the sole discretion of our Board of Directors and will depend upon such

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factors as cash flow generated by operations, profitability, financial condition, cash requirements, prospects, and other factors deemed relevant by our Board of Directors. The right of our Board of Directors to declare dividends, however, is subject to the availability of sufficient funds under Florida law to pay dividends. In addition, our ability to pay dividends depends on certain restrictions in our credit agreement.

Securities Analyst Research and Reports

The trading markets for our Common stock rely in part on the research and reports that industry or financial analysts publish about us or our business or industry. If one or more of the analysts who cover us downgrade our stock or our industry, or the stock of Carrier Global Corporation or any of our competitors, or publish negative or unfavorable research about our business, the price of our stock could decline. If one or more of these analysts cease coverage of us or fail to publish reports on us regularly, we could lose visibility in the market, which in turn could cause our stock price or trading volume to decline.

Class B Common Stock and Insider Ownership

As of October 29, 2024, our directors and executive officers and entities affiliated with them owned: (i) Common stock representing 1% of the outstanding shares of Common stock and (ii) Class B common stock representing 89% of the outstanding shares of Class B common stock. These interests represent 55% of the aggregate combined voting power (including 53% beneficially owned by Albert H. Nahmad, Chairman and Chief Executive Officer, Aaron J. Nahmad, President (the son of our Chairman and Chief Executive Officer), and Valerie Schimel, Director (the daughter of our Chairman and Chief Executive Officer)), through shares owned by them and shares held by affiliated limited partnerships, various family trusts, and a charitable foundation. Accordingly, our directors and executive officers collectively have the voting power to elect six members of our nine-person Board of Directors.

Our Class B common stock is substantially identical to our Common stock except: (i) each share of Common stock is entitled to one vote on all matters submitted to a vote of our shareholders, and each share of Class B common stock is entitled to ten votes; (ii) shareholders of Common stock are entitled to elect 25% of our Board of Directors (rounded up to the nearest whole number), and Class B shareholders are entitled to elect the balance of our Board of Directors; (iii) cash dividends may be paid on Common stock without paying a cash dividend on Class B common stock, and no cash dividend may be paid on Class B common stock unless at least an equal cash dividend is paid on Common stock; and (iv) Class B common stock is convertible at any time into Common stock on a one-for-one basis at the option of the shareholder.

Management will have broad discretion as to the use of the net proceeds from this offering, and we may not use the proceeds effectively.

Our management will have broad discretion as to the application of the net proceeds from this offering and could use them for purposes other than those described in “Use of Proceeds”. Our shareholders may not agree with the manner in which our management chooses to allocate and spend the net proceeds from this offering. Moreover, our management may use the net proceeds from this offering for corporate purposes that may not increase our market value.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Certain of the statements contained in this prospectus supplement, the accompanying prospectus and in documents incorporated by reference in this prospectus supplement are “forward-looking” statements as defined in the Private Securities Litigation Reform Act of 1995. Generally, the words “anticipate,” “estimate,” “could,” “should,” “may,” “plan,” “seek,” “expect,” “believe,” “intend,” “target,” “will,” “project,” “focused,” “outlook,” “goal,” “designed” and variations of these words and negatives thereof and similar expressions are intended to identify forward-looking statements, which generally are not historical in nature. All statements which address future operating performance, events or developments that we expect or anticipate will occur in the future, and statements about future operating results, are forward-looking statements, including statements regarding, among other items, (i) economic conditions, (ii) business and acquisition strategies, (iii) potential acquisitions and/or joint ventures and investments in unconsolidated entities, (iv) financing plans and (v) industry, demographic and other trends affecting our financial condition or results of operations. Forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from our historical experience and our present expectations. As and when made, management believes that these forward-looking statements are reasonable. However, caution should be taken not to place undue reliance on any such forward-looking statements since such statements speak only as of the date when made and there can be no assurance that such forward-looking statements will occur. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise

Factors exist that could cause our actual results to differ materially from the expected results described in or underlying our forward-looking statements. Some of such factors are described under “Risk Factors” in our Annual Report on Form 10-K most recently filed with the Securities and Exchange Commission (“SEC”) and in similar sections of documents incorporated into this prospectus by reference. Such factors include:

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Accordingly, there can be no assurance that the forward-looking statements contained herein will occur or that objectives will be achieved. All written and verbal forward-looking statements attributable to Watsco, Inc. or persons acting on our behalf are expressly qualified in their entirety by such factors.

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USE OF PROCEEDS

We intend to use the net proceeds from the sale of Common stock in this offering for general corporate purposes, which may include, without limitation, acquisitions, the repayment of outstanding indebtedness, capital expenditures and working capital.

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PLAN OF DISTRIBUTION

We have entered into a third amended and restated sales agreement, dated May 3, 2024, with Robert W. Baird & Co. Incorporated, the agent, which amends and restates the second amended and restated sales agreement to increase the aggregate gross sales price available for sales of our Common stock thereunder by up to an additional $400,000,000 as a result of our utilization of approximately the full $300,000,000 of availability for such sales under the second amended and restated sales agreement prior to the entry into the third amended and restated sales agreement.

Sales of shares of our Common stock, if any, under this prospectus supplement and the accompanying prospectus may be made in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange, or in negotiated transactions, which may include block trades.

The offering of the shares of our Common stock by the agent is subject to receipt and acceptance of written instructions and subject to the agent’s right to decline any order in whole or in part. Upon its acceptance of a placement notice from us, the agent will use its commercially reasonable efforts consistent with its normal sales and trading practices to solicit offers to purchase shares of our Common stock up to the amount specified, and in accordance with the terms and conditions set forth in the third amended and restated sales agreement. The placement notice that we deliver will set forth the number of shares to be issued, the time period during which sales are requested to be made by the agent, any limitation on the number of shares that may be sold in any one trading day and any minimum price below which sales may not be made. We or the agent may suspend the offering of shares of our Common stock upon proper notice and subject to other conditions. There is no arrangement for funds to be received in an escrow, trust or similar account. Sales of shares of our Common stock as contemplated by this prospectus supplement will be settled through the facilities of DTC.

The agent will provide written confirmation to us no later than the opening of the trading day on the NYSE on the day following the trading day on which shares of our Common stock were sold under the third amended and restated sales agreement. Each confirmation will include the number of shares sold on the relevant day, the net proceeds to us and the compensation payable by us to the agent in connection with the sales.

We will pay the agent commissions for its services in acting as agent and/or principal in the sale of shares of our Common stock. The agent will be entitled to compensation of up to 2.0% of the gross sales price of all shares of Common stock sold through it pursuant to the third amended and restated sales agreement. We estimate that the total expenses for the offering, excluding compensation payable to the agent under the terms of the third amended and restated sales agreement, will be approximately $91,500, inclusive of the SEC registration fee (which has previously been paid).

We may also sell shares of our Common stock to the agent as principal for its own account at a price agreed upon at the time of sale. If we sell shares of our Common stock to the agent as principal, we will enter into a separate agreement with the agent setting forth the terms of such transaction, and, to the extent required by applicable law, we will describe this agreement in a separate prospectus supplement or pricing supplement.

We will report at least quarterly the number of shares of our Common stock sold through the agent under the third amended and restated sales agreement, the net proceeds to us and the compensation paid by us to the agent in connection with the sales of shares of our Common stock.

The agent and its affiliates have provided, and may in the future provide, various investment banking, commercial banking, fiduciary and advisory services for us from time to time for which they have received, and may in the future receive, customary fees and expenses. The agent and its affiliates may, from time to time, engage in other transactions with and perform services for us in the ordinary course of their business.

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In the ordinary course of their business activities, the agent and its affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers. Such investments and securities activities may involve securities and/or instruments of ours or our affiliates.

In connection with the sale of shares of our Common stock on our behalf, the agent may be deemed to be an “underwriter” within the meaning of the Securities Act and the compensation of the agent may be deemed to be underwriting commissions or discounts. We have agreed to indemnify the agent against specified liabilities, including liabilities under the Securities Act, or to contribute to payments that the agent may be required to make because of those liabilities.

The offering of shares of our Common stock pursuant to the third amended and restated sales agreement will terminate upon the earlier of (1) the sale of shares of Common stock under the third amended and restated sales agreement having an aggregate gross sales price of $400,000,000 and (2) the termination of the third amended and restated sales agreement. The third amended and restated sales agreement may be terminated by the agent at any time by giving us three days’ notice, by us at any time, and by the agent at any time in certain circumstances, including the occurrence of a material adverse change in our company.

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LEGAL MATTERS

The validity of the shares of Common stock offered by this prospectus supplement has been passed upon for us by Greenberg Traurig, P.A., Miami, Florida. Cesar Alvarez, one of our Directors, is the Executive Chairman of Greenberg Traurig, P.A., which receives from us customary fees for legal services.

The agent has been represented in this offering by Morrison & Foerster LLP, Washington, D.C.

EXPERTS

The consolidated financial statements of Watsco, Inc. and its subsidiaries as of December 31, 2023 and for the year ended December 31, 2023 and management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2023 have been incorporated by reference herein in reliance upon the report of Deloitte & Touche LLP, independent registered public accounting firm, and upon the authority of said firm as experts in accounting and auditing.

The consolidated financial statements of Watsco, Inc. and its subsidiaries as of December 31, 2022 and 2021, and for each of the years in the two-year period ended December 31, 2022, have been incorporated by reference herein in reliance upon the report of KPMG LLP, independent registered public accounting firm, and upon the authority of said firm as experts in accounting and auditing.

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WHERE YOU CAN FIND MORE INFORMATION

This prospectus supplement is part of a registration statement we filed with the SEC and does not contain all the information set forth or incorporated by reference in the registration statement. Whenever a reference is made (or incorporated by reference) in this prospectus supplement to any of our contracts, agreements, or other documents, the reference may not be complete and you should refer to the exhibits that are a part of the registration statement or the exhibits to the reports or other documents incorporated by reference into this prospectus supplement for a copy of such contract, agreement, or other document. Because we are subject to the information and reporting requirements of the Exchange Act, we file annual, quarterly, and current reports, proxy statements, and other information with the SEC. Our SEC filings are available to the public over the Internet at the SEC’s website at http://www.sec.gov.

Our website address is www.watsco.com. The information contained on, or accessible through, our website is not incorporated into this prospectus supplement or accompanying prospectus and does not form a part hereof or thereof.

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INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The SEC allows us to “incorporate by reference” information into this prospectus supplement and the accompanying prospectus, which means that we can disclose important information to you by referring to those documents. We hereby “incorporate by reference” the documents listed below, which means that we are disclosing important information to you by referring you to those documents. The information that we file later with the SEC will automatically update and in some cases supersede this information. Specifically, we incorporate by reference the following documents or information filed with the SEC (other than, in each case, documents or information deemed to have been furnished and not filed in accordance with SEC rules):

We will provide without charge to each person, including any shareholder, to whom a prospectus is delivered, upon written or oral request of that person, a copy of any and all of the information that has been incorporated by reference in this prospectus supplement (excluding exhibits unless specifically incorporated by reference into those documents). Please direct requests to us at the following address:

Watsco, Inc.

Attn: Investor Relations

2665 S. Bayshore Drive, Suite 901

Miami, Florida, 33133

(305) 714-4100

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PROSPECTUS

Watsco, Inc.

Common Stock

Class B Common Stock

We are Watsco, Inc., a corporation incorporated under the laws of the State of Florida. This prospectus relates to the public offer and sale of Common stock and Class B common stock that we may offer from time to time. We may offer and sell the securities at prices and on terms to be determined at the time of sale and set forth in a prospectus supplement. You should read this prospectus, the applicable prospectus supplement and other offering materials carefully before you invest.

We may offer the securities from time to time through public or private transactions, and in the case of our Common stock and our Class B common stock, on or off the New York Stock Exchange, at prevailing market prices or at privately negotiated prices. Sales may be made directly to purchasers or to or through agents, broker-dealers or underwriters. If any agents or underwriters are involved in the sale of any of these securities, the applicable prospectus supplement will set forth the names of the agents or underwriters and any applicable fees, commissions or discounts. Our net proceeds from the sale of securities will also be set forth in the applicable prospectus supplement.

Our Common stock is listed on the New York Stock Exchange under the ticker symbol “WSO,” and our Class B common stock is listed on the New York Stock Exchange under the ticker symbol “WSOB.”

Investing in our securities involves risks. Before buying any offered securities, you should carefully consider the risk factors contained in this prospectus under the heading “Risk Factors”, beginning on page 2 of this prospectus and in the “Risk Factors” section of the documents incorporated by reference in this prospectus.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

The date of this prospectus is November 4, 2024.

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS

This prospectus is part of a “shelf” registration statement on Form S-3 that we filed with the United States Securities and Exchange Commission, or the SEC. By using a shelf registration statement, Watsco may sell, at any time and from time to time, in one or more offerings, any combination of the securities described in this prospectus. As allowed by the SEC rules, this prospectus does not contain all of the information included in the registration statement. For further information, we refer you to the registration statement, including its exhibits. Statements contained in this prospectus about the provisions or contents of any agreement or other document are not necessarily complete. If the SEC’s rules and regulations require that an agreement or document be filed as an exhibit to the registration statement, of which this prospectus forms a part, please see that agreement or document for a complete description of these matters.

This prospectus provides you only with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that contains specific information about the terms of the securities offered. You should read this prospectus and any prospectus supplement together with any additional information you may need to make your investment decision. You should also read and carefully consider the information in the documents we have referred you to in the “Where You Can Find More Information” section found on page 9. Information incorporated by reference after the date of this prospectus is considered a part of this prospectus and may add, update or change information contained in this prospectus. Any information in such subsequent filings that is inconsistent with this prospectus or any prospectus supplement will supersede the information in this prospectus or such prospectus supplement. Before purchasing any securities, you should carefully read this prospectus, any supplement and any free writing prospectus related to the applicable securities that is prepared by us or on our behalf or that is otherwise authorized by us, together with the additional information described under the heading “Incorporation of Certain Documents by Reference” found on page 9.

You should rely only on the information contained or incorporated by reference in this prospectus, any prospectus supplement and any free writing prospectus related to the applicable securities that is prepared by us or on our behalf or that is otherwise authorized by us. We have not authorized any other person to provide you with additional or different information. If anyone provides you with additional, different or inconsistent information, you should not rely on it. We will not make an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus, as well as information we have previously filed with the SEC and incorporate herein by reference, is accurate only as of the date on the front cover of this prospectus. Our business, financial condition, results of operations and prospects may have changed since that date.

References in this prospectus to the “Registrant,” “Watsco,” “we,” “us,” and “our” refer to Watsco, Inc. and its subsidiaries, unless the context requires otherwise.

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RISK FACTORS

Investing in our securities involves risks. Before deciding to purchase any of our securities, you should carefully consider the discussion of risks and uncertainties under the heading “Risk Factors” contained in our Annual Report on Form 10-K for the year ended December 31, 2023, our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024, June 30, 2024, and September 30, 2024, and the other documents incorporated by reference in this prospectus, and under similar headings in our subsequently filed quarterly reports on Form 10-Q and annual reports on Form 10-K, as well as the other risks and uncertainties described in any applicable prospectus supplement and in the other documents incorporated by reference in this prospectus. See the section entitled “Where You Can Find More Information” found on page 9. The risks and uncertainties we discuss in the documents incorporated by reference in this prospectus are those we currently believe may materially affect our company. Additional risks and uncertainties not presently known to us or that we currently believe are immaterial also may materially and adversely affect our business, financial condition and results of operations.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Certain of the statements contained in this prospectus and in documents incorporated by reference in this prospectus are “forward-looking” statements as defined in the Private Securities Litigation Reform Act of 1995. Generally, the words “anticipate,” “estimate,” “could,” “should,” “may,” “plan,” “seek,” “expect,” “believe,” “intend,” “target,” “will,” “project,” “focused,” “outlook,” “goal,” “designed” and variations of these words and negatives thereof and similar expressions are intended to identify forward-looking statements, which generally are not historical in nature. All statements which address future operating performance, events or developments that we expect or anticipate will occur in the future, and statements about future operating results, are forward-looking statements, including statements regarding, among other items, (i) economic conditions, (ii) business and acquisition strategies, (iii) potential acquisitions and/or joint ventures and investments in unconsolidated entities, (iv) financing plans and (v) industry, demographic and other trends affecting our financial condition or results of operations. These forward-looking statements are based on management’s current expectations, are not guarantees of future performance and are subject to a number of risks, uncertainties, and changes in circumstances, certain of which are beyond our control. Actual results could differ materially from these forward-looking statements as a result of several factors, including, but not limited to:

We believe these forward-looking statements are reasonable; however, you should not place undue reliance on any forward-looking statements, which are based on current expectations. For additional information regarding important factors that may affect our operations and could cause actual results to vary materially from those anticipated in the forward-looking statements, please see Item 1A “Risk Factors” in our Annual Reports on Form 10-K, as well as the other documents and reports that we file with the SEC and incorporate by reference into this prospectus. Forward-looking statements speak only as of the date the statements were made. We assume

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no obligation to update forward-looking information or the discussion of such risks and uncertainties to reflect actual results, changes in assumptions, or changes in other factors affecting forward-looking information, except as required by applicable law. We qualify any and all of our forward-looking statements by these cautionary factors.

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THE COMPANY

This summary highlights selected information and does not contain all the information that is important to you. You should carefully read this prospectus, any applicable prospectus supplement and the documents to which we have referred to in “Incorporation of Certain Documents by Reference” on page 9 of this prospectus for information about us and our financial statements.

Watsco, Inc. was incorporated in Florida in 1956 and is the largest distributor of air conditioning, heating, and refrigeration equipment and related parts and supplies (“HVAC/R”) in the HVAC/R distribution industry in North America. At September 30, 2024, we operated from 689 locations in 43 U.S. States, Canada, Mexico, and Puerto Rico with additional market coverage on an export basis to portions of Latin America and the Caribbean.

Our principal executive office is located at 2665 South Bayshore Drive, Suite 901, Miami, Florida 33133, and our telephone number is (305) 714-4100. Our website address on the Internet is www.watsco.com. The information contained on or accessible through our website is not incorporated into this prospectus.

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USE OF PROCEEDS

Unless we specify otherwise in the applicable prospectus supplement, we expect to use the net proceeds, if any, from the sale of the securities offered hereby for general corporate purposes, which may include:

Any specific allocation of the net proceeds of an offering of securities to a specific purpose will be determined at the time of such offering and will be described in the related prospectus supplement.

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DESCRIPTION OF CAPITAL STOCK

The following summarizes certain material terms and provisions of our Common stock, our Class B common stock and our preferred stock. It does not purport to be complete, however, and is qualified in its entirety by reference to the Florida Business Corporation Act, referred to as the Florida Act, and the complete text of our Amended and Restated Articles of Incorporation, as amended, referred to as our Amended and Restated Articles of Incorporation, and our Second Amended and Restated Bylaws, referred to as our Amended and Restated Bylaws, each of which is incorporated by reference as an exhibit to the registration statement of which this prospectus forms a part.

Overview - Authorized and Outstanding Shares

As of October 29, 2024, under our Amended and Restated Articles of Incorporation, we had the authority to issue:

As of October 29, 2024:

The following descriptions set forth certain general terms and provisions of our Common stock and Class B common stock to which a prospectus supplement may relate. The particular terms of the shares of Common stock and Class B common stock being offered and the extent to which the general provisions may apply will be described in the applicable prospectus supplement. If so indicated in the applicable prospectus supplement, the terms of any series of shares of capital stock may differ from the terms set forth below, except with respect to those terms required by our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws.

Rights of Our Common Stock

Preemptive Rights. The holders of our Common stock do not have preemptive rights to purchase or subscribe for any stock or other securities of ours.

Voting Rights. Each outstanding share of our Common stock is entitled to one vote per share.

Dividends. Holders of our Common stock are entitled to receive dividends or other distributions when and if declared by our Board of Directors. The right of our Board of Directors to declare dividends, however, is subject to any rights of the holders of other classes of our capital stock and the availability of sufficient funds under Florida law to pay dividends. In addition, our ability to pay dividends depends on certain restrictions in our unsecured revolving credit agreement.

Liquidation Rights. In the event of the liquidation of the Company, subject to the rights, if any, of the holders of other classes of our capital stock, the holders of our Common stock are entitled to receive any of our assets available for distribution to our shareholders ratably in proportion to the number of shares held by them.

Listing. We list our Common stock on the New York Stock Exchange under the symbol “WSO.”

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Additionally, please see “—Material Provisions of our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws” below.

Rights of Our Class B Common Stock

Our Class B common stock is substantially identical to our Common stock except: (i) each share Common stock is entitled to one vote on all matters submitted to a vote of our shareholders, and each share of Class B common stock is entitled to ten votes; (ii) shareholders of Common stock are entitled to elect 25% of our Board of Directors (rounded up to the nearest whole number), and Class B shareholders are entitled to elect the balance of the Board of Directors; (iii) cash dividends may be paid on Common stock without paying a cash dividend on Class B common stock, and no cash dividend may be paid on Class B common stock unless at least an equal per share cash dividend is paid on Common stock; and (iv) Class B common stock is convertible at any time into Common stock on a one-for-one basis at the option of the shareholder.

We list our Class B common stock on the New York Stock Exchange under the symbol “WSOB.”

Additionally, please see “—Material Provisions of our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws” below.

Rights of Our Preferred Stock

We are authorized to issue preferred stock with such designation, rights and preferences as may be determined from time to time by our Board of Directors. Accordingly, the Board of Directors is empowered, without approval of the holders of our Common stock or Class B common stock, to issue preferred stock with dividend, liquidation, conversion, voting or other rights which could adversely affect the voting power or other rights of the holders of our Common stock and Class B common stock. In the event of issuance, the preferred stock could be utilized, under certain circumstances, as a method of discouraging, delaying or preventing a change in control of the Company or making removal of management more difficult. Please see “—Material Provisions of our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws” below.

Material Provisions of our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws

Our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws contain provisions that could discourage, delay or prevent a tender offer or takeover attempt at a price which many shareholders may find attractive. The existence of these provisions could limit the price that investors might otherwise pay in the future for shares of our Common stock and Class B common stock.

Blank Check Preferred Stock. As noted above, our preferred stock could be issued quickly and utilized, under certain circumstances, as a method of discouraging, delaying or preventing a change in control of the Company or make removal of management more difficult. As of the date of the prospectus, the Company does not intend to issue any preferred stock.

Election of Directors. Our Amended and Restated Articles of Incorporation provide for the filling of vacancies occurring on the Board of Directors by certain votes of the remaining directors. These provisions may discourage a third party from voting to remove incumbent directors and simultaneously gaining control of the Board of Directors by filling the vacancies created by that removal with its own nominees.

Classified Board. Our Amended and Restated Articles of Incorporation provide that our Board of Directors shall be divided into three classes serving staggered terms. Approximately one-third of the Board of Directors is elected each year. The provision for a classified board could prevent a party who acquires control of a majority of our outstanding capital stock entitled to vote from obtaining control of our Board of Directors until the second

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annual shareholders’ meeting following the date the acquiring party obtains such a controlling interest. The classified board provision could discourage a potential acquiror from making a tender offer or otherwise attempting to obtain control of the Company and could increase the likelihood that incumbent directors will retain their positions.

Indemnification. Our Amended and Restated Articles of Incorporation and Amended and Restated Bylaws provide for indemnification of our officers and directors to the fullest extent allowed by applicable law. Insofar as indemnification for liabilities arising under the Securities Act of 1933, as amended, which we refer to as the Securities Act, may be permitted to directors, officers or persons controlling us under the provisions that we describe above or otherwise, we have been informed that in the opinion of the SEC, this indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

Transfer Agent and Registrar

The transfer agent and registrar for our Common stock and Class B common stock is Equiniti Trust Company, LLC.

Florida Anti-Takeover Statute

As a Florida corporation, we are subject to certain anti-takeover provisions that apply to public corporations under Florida law. Pursuant to Section 607.0901 of the Florida Act, a publicly held Florida corporation may not engage in a broad range of business combinations or other extraordinary corporate transactions with an interested shareholder for a period of three (3) years following the time that such shareholder became an interested shareholder, unless:

The above requirements do not apply to such business combinations or other extraordinary corporate transactions with an interested shareholder if:

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An interested shareholder is defined as a person who, together with affiliates and associates, beneficially owns more than 15% of a corporation’s outstanding voting shares. We have not made an election in our Amended and Restated Articles of Incorporation to opt out of Section 607.0901.

In addition, we are subject to Section 607.0902 of the Florida Act, which prohibits the voting of shares in a publicly held Florida corporation that are acquired in a control share acquisition unless (i) our Board of Directors approved such acquisition prior to its consummation or (ii) after such acquisition, in lieu of prior approval by our Board of Directors, the holders of a majority of the corporation’s voting shares, exclusive of shares owned by officers of the corporation, employee directors or the acquiring party, approve the granting of voting rights as to the shares acquired in the control share acquisition. A control share acquisition is defined as an acquisition that immediately thereafter entitles the acquiring party to 20% or more of the total voting power in an election of directors. We have not made an election in our Amended and Restated Articles of Incorporation or Amended and Restated Bylaws to opt out of Section 607.0902.

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PLAN OF DISTRIBUTION

We may sell securities to one or more underwriters or dealers for public offering and sale by them, or we may sell the securities to investors directly or through agents. The applicable prospectus supplement will set forth the terms of the particular offering and the method of distribution and will identify any firms acting as underwriters, dealers or agents in connection with the offering, including:

We may distribute our securities from time to time in one or more transactions at a fixed price or prices, which may be changed, or at prices determined as the prospectus supplement specifies, including in “at-the-market” offerings. We may sell our securities through a rights offering, forward contracts or similar arrangements. Any underwriting discounts or other compensation which we pay to underwriters or agents in connection with the offering of our securities, and any discounts, concessions or commissions which underwriters allow to dealers, will be set forth in the prospectus supplement. Underwriters may sell our securities to or through dealers, and such dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and commissions from the purchasers for whom they may act as agents. Underwriters, dealers and agents that participate in the distribution of our securities may be deemed to be underwriters under the Securities Act and any discounts or commissions they receive from us and any profit on the resale of our securities they realize may be deemed to be underwriting discounts and commissions under the Securities Act. Any such underwriter or agent will be identified, and any such compensation received from us, will be described in the applicable prospectus supplement. Unless otherwise set forth in the prospectus supplement relating thereto, the obligations of the underwriters or agents to purchase our securities will be subject to conditions precedent and the underwriters will be obligated to purchase all our offered securities if any are purchased. The public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time.

Any common stock sold pursuant to this prospectus and applicable prospectus supplement will be approved for trading, upon notice of issuance, on the New York Stock Exchange.

Underwriters and their controlling persons, dealers and agents may be entitled, under agreements entered into with us, to indemnification against and contribution toward specific civil liabilities, including liabilities under the Securities Act.

An underwriter may engage in over-allotment, stabilizing transactions, short covering transactions and penalty bids in accordance with securities laws. Over-allotment involves sales in excess of the offering size, which creates a short position. Stabilizing transactions permit bidders to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum. Short covering transactions involve purchases of the

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securities in the open market after the distribution is completed to cover short positions. Penalty bids permit the underwriters to reclaim a selling concession from a dealer when the securities originally sold by the dealer are purchased in a covering transaction to cover short positions. Those activities may cause the price of the securities to be higher than it would otherwise be. The underwriters may engage in these activities on any exchange or other market in which the securities may be traded. If commenced, the underwriters may discontinue these activities at any time.

Certain of the underwriters and their affiliates may be customers of, engage in transactions with, and perform services for, us and our subsidiaries in the ordinary course of business.

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LEGAL MATTERS

Certain legal matters with respect to the validity of the securities offered under this prospectus will be passed upon for us by Greenberg Traurig, P.A., Miami, Florida. Cesar Alvarez, one of our Directors, is the Executive Chairman of Greenberg Traurig, P.A., which receives from us customary fees for legal services.

EXPERTS

The consolidated financial statements of Watsco, Inc. and its subsidiaries as of December 31, 2023, and for the year ended December 31, 2023, and management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2023 have been incorporated by reference herein in reliance upon the reports of Deloitte & Touche LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

The consolidated financial statements of Watsco, Inc. and its subsidiaries as of December 31, 2022, and for each of the years in the two-year period ended December 31, 2022 have been incorporated by reference herein in reliance upon the report of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

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WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains an internet site that contains reports, proxy and information statements, and other information that we file electronically with the SEC and which are available at the SEC’s website at http://www.sec.gov. In addition, our SEC filings are available on our website at http://www.watsco.com. The information contained on, or accessible through, our website is not incorporated by reference in this prospectus and should not be considered part of this prospectus.

This prospectus is part of a registration statement that we filed with the SEC. The registration statement contains more information than this prospectus regarding us and our Common stock and Class B common stock, including certain exhibits. You can obtain a copy of the registration statement from the SEC at the address listed above or from the SEC’s web site listed above.

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INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The SEC allows us to “incorporate by reference” information into this prospectus, which means that we can disclose important information to you by referring to those documents. We hereby “incorporate by reference” the documents listed below, which means that we are disclosing important information to you by referring you to those documents. The information that we file later with the SEC will automatically update and in some cases supersede this information. Specifically, we incorporate by reference the following documents or information filed with the SEC (other than, in each case, documents or information deemed to have been furnished and not filed in accordance with SEC rules):

Additionally, all documents subsequently filed by the Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as amended (not including any information furnished under Items 2.02, 7.01 or 9.01 of Form 8-K or any other information that is identified as “furnished” rather than filed), which information is not incorporated by reference herein), prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated herein by reference and to be a part of this registration statement from the date of filing of such documents. Any statement contained in a document incorporated herein by reference will be deemed to be modified or superseded for purposes of this registration statement to the extent that a statement contained herein, or in a subsequently filed document incorporated herein by reference, modifies or supersedes the statement. Any statement modified or superseded will not be deemed, except as modified or superseded, to constitute a part of this registration statement.

We will provide without charge to each person, including any beneficial shareholder, to whom a prospectus is delivered, upon written or oral request of that person, a copy of any and all of the information that has been incorporated by reference in this prospectus (excluding exhibits unless specifically incorporated by reference into those documents). Please direct requests to us at the following address:

Watsco, Inc.

Attn: Investor Relations

2665 South Bayshore Drive, Suite 901

Miami, Florida, 33133

(305) 714-4100

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$400,000,000

Watsco, Inc.

Common stock

Prospectus Supplement

Baird

November 4, 2024