BMCH BMC Stock Holdings Inc

As previously disclosed, on August 26, 2020, BMC Stock Holdings, Inc., a Delaware corporation (“BMC”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among Builders FirstSource, Inc., a Delaware corporation (“Builders FirstSource”), and Boston Merger Sub I Inc., a Delaware corporation and a direct, wholly owned subsidiary of Builders FirstSource (“Merger Sub”). Subject to the terms and conditions of the Merger Agreement, Merger Sub will be merged with and into BMC and BMC will survive the merger as a wholly owned subsidiary of Builders FirstSource (the “Merger”).

On December 14, 2020, the BMC board of directors took actions to preserve compensation-related corporate income tax deductions for BMC that might otherwise be disallowed through the operation of Sections 280G and 4999 of the Internal Revenue Code of 1986, as amended (the “Code”), in connection with the Merger. Specifically, the BMC board of directors approved the vesting of equity awards and the accelerated payment of short-term cash incentive compensation for BMC’s named executive officers, David E. Flitman, President and Chief Executive Officer, James F. Major, Jr., Executive Vice President, Chief Financial Officer and Treasurer, Mike Farmer, Executive Vice President, Operational Excellence, People and Growth, Timothy D. Johnson, Executive Vice President, General Counsel and Secretary, and other employees who are not executive officers, as further described below. These actions will mitigate or eliminate the amount of excise tax that may be payable by Messrs. Flitman, Major, Farmer and Johnson pursuant to Sections 280G and 4999 of the Code in certain circumstances.

The BMC board of directors approved the accelerated payment of $1,031,250 for Mr. Flitman and $337,500 for Mr. Johnson, in each case, which (i) amount will be paid to the applicable named executive officer on or before December 31, 2020 and (ii) represents payment of a portion of the named executive officer’s respective bonus under the BMC annual bonus plan in respect of the 2020 fiscal year (the “2020 Bonus”) at approximately 65% of the amount that BMC presently expects would otherwise be paid in early 2021. Any remaining amount of the 2020 Bonus will be paid in the first quarter of 2021.

With respect to Mr. Flitman, the BMC board of directors approved the accelerated vesting and settlement, as of December 15, 2020, of 116,667 performance-based restricted stock units (“PSUs”) granted on September 26, 2018 to Mr. Flitman (“September PSUs”), which number of September PSUs was determined by assuming the applicable performance goals were achieved at target-level performance. Prior to the action by the BMC board of directors, the September PSUs were scheduled to vest on December 31, 2021.

The BMC board of directors approved the accelerated vesting and settlement, as of December 15, 2020, of all PSUs granted on March 1 and March 15, 2018 to all employees who received such grants (including to BMC’s named executive officers, other than Mr. Flitman and Mr. Johnson) (“March PSUs”), which number of March PSUs was determined assuming the applicable performance goals were achieved at an estimated level of actual performance on December 31, 2020, as reasonably determined by the Board, of 200% of target performance, with 25,000 March PSUs held by Mr. Major vesting and settling and 12,256 March PSUs held by Mr. Farmer vesting and settling. Prior to the action by the BMC board of directors, the March PSUs were otherwise scheduled to vest on March 1 or March 15, 2021.

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Cautionary Notice Regarding Forward-Looking Statements

This report, in addition to historical information, contains “forward-looking statements” (as defined in the Private Securities Litigation Reform Act of 1995) regarding, among other things, future events or the future financial performance of BMC Stock Holdings, Inc. (“BMC”) and Builders FirstSource, Inc. (“Builders FirstSource”). Words such as “may,” “will,” “should,” “plans,” “estimates,” “predicts,” “potential,” “anticipate,” “expect,” “project,” “intend,” “believe,” or the negative of these terms, and words and terms of similar substance used in connection with any discussion of future plans, actions or events identify forward-looking statements. Any forward-looking statements involve risks and uncertainties that are difficult to predict or quantify, and such risks and uncertainties could cause actual events or results to differ materially from the events or results described in the forward-looking statements, including risks, or uncertainties related to the novel coronavirus disease 2019 (also known as “COVID-19”) pandemic and its impact on the business operations of BMC and Builders FirstSource and on local, national and global economies, the growth strategies of BMC and Builders FirstSource, fluctuations of commodity prices and prices of the products of BMC and Builders FirstSource as a result of national and international economic and other conditions, or the significant dependence of both companies’ revenues and operating results on, among other things, the state of the homebuilding industry and repair and remodeling activity, lumber prices and the economy. Neither BMC nor Builders FirstSource may succeed in addressing these and other risks or uncertainties.

Forward-looking statements relating to the proposed business combination between BMC and Builders FirstSource include, but are not limited to: statements about the benefits of the proposed business combination between BMC and Builders FirstSource, including future financial and operating results; the plans, objectives, expectations and intentions of BMC and Builders FirstSource; the expected timing of completion of the proposed business combination; and other statements relating to the proposed merger that are not historical facts. Forward-looking statements are based on information currently available to BMC and Builders FirstSource and involve estimates, expectations and projections. Investors are cautioned that all such forward-looking statements are subject to risks and uncertainties, and important factors could cause actual events or results to differ materially from those indicated by such forward-looking statements. With respect to the proposed business combination between BMC and Builders FirstSource, these factors could include, but are not limited to: the risk that a condition to closing of the business combination may not be satisfied, including as a result of the failure to obtain approval of stockholders of BMC and Builders FirstSource on the expected terms and schedule or at all; the length of time necessary to consummate the proposed business combination, which may be longer than anticipated for various reasons; the risk that the businesses will not be integrated successfully; the risk that the cost savings, synergies and growth from the proposed business combination may not be fully realized or may take longer to realize than expected; the assumptions on which the parties’ estimates of future results of the combined business have been based may prove to be incorrect in a number of material ways, which could result in an inability to realize the expected benefits of the proposed business combination or exposure to material liabilities; the diversion of management time on issues related to the business combination; the effect of future regulatory or legislative actions on the companies or the industries in which they operate; the risk that the credit ratings of the combined company may be different from what the parties expect; economic and foreign exchange rate volatility; changes in the general economic environment, or social or political conditions, that could affect the businesses; the potential effect of the announcement or consummation of the proposed business combination on relationships with customers, suppliers, competitors, lenders, landlords, management and other employees; the ability to attract new customers and retain existing customers in the manner anticipated or at all; the ability to hire and retain key personnel; reliance on and integration of information technology systems; the risks associated with assumptions the parties make in connection with the parties’ critical accounting estimates and legal proceedings; certain restrictions during the pendency of the business combination that may affect the ability of BMC and Builders FirstSource to pursue certain business opportunities or strategic transactions; and the potential of international unrest, economic downturn or effects of anticipated tax rates, raw material costs or availability, benefit or retirement plan costs, or other regulatory compliance costs.

Additional information concerning other risk factors pertaining to BMC and Builders FirstSource is also contained in the parties’ respective most recently filed Annual Reports on Form 10-K, subsequent Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and other information filed with the Securities and Exchange Commission (the “SEC”). Many of these risks and uncertainties are beyond BMC’s or Builders FirstSource’s ability to control or predict. Because of these risks and uncertainties, you should not place undue reliance on these forward-looking statements. It is not possible to anticipate or foresee all risks and uncertainties, and investors should not consider any list of risks and uncertainties to be exhaustive or complete. Furthermore, neither BMC nor Builders FirstSource undertakes any obligation to update publicly or revise any forward-looking statements to reflect events or circumstances that may arise after the date of this report. Nothing in this report is intended, or is to be construed, as a profit forecast or to be interpreted to mean that the earnings per share of the common stock of BMC or of the common stock of Builders FirstSource for the current or any future financial years, or the earnings per share of the common stock of the combined company, will necessarily match or exceed the historical published earnings per share of the common stock of BMC or Builders FirstSource, as applicable. Annualized, pro forma, projected and estimated numbers are used for illustrative purpose only, are not forecasts and may not reflect actual results. All subsequent written and oral forward-looking statements concerning BMC, Builders FirstSource, the proposed business combination, the combined company or other matters and attributable to BMC, Builders FirstSource or any person acting on their behalf are expressly qualified in their entirety by the cautionary statements above.

Additional Information and Where to Find It

In connection with the proposed business combination, Builders FirstSource previously filed with the SEC a registration statement on Form S-4 (the “Registration Statement”) that includes a prospectus with respect to the shares of common stock to be issued by Builders FirstSource in the business combination and a joint proxy statement for BMC’s and Builders FirstSource’s respective stockholders (the “Joint Proxy Statement”). This Registration Statement was declared effective on November 18, 2020. Each of BMC and Builders FirstSource commenced mailing the definitive Joint Proxy Statement to its stockholders on or about November 18, 2020 and may file other documents regarding the business combination with the SEC. This report is not a substitute for the Registration Statement, the definitive Joint Proxy Statement, or any other document that BMC or Builders FirstSource may send to its stockholders in connection with the proposed business combination. This report is for informational purposes only and does not constitute, or form a part of, an offer to sell or the

solicitation of an offer to sell or an offer to buy or the solicitation of an offer to buy any securities, and there shall be no sale of securities, in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, and otherwise in accordance with applicable law. INVESTORS AND SECURITY HOLDERS OF BMC AND BUILDERS FIRSTSOURCE ARE URGED TO READ THE REGISTRATION STATEMENT, THE DEFINITIVE JOINT PROXY STATEMENT, AND ANY OTHER RELEVANT DOCUMENTS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT BMC, BUILDERS FIRSTSOURCE, THE PROPOSED BUSINESS COMBINATION AND RELATED MATTERS. Investors and security holders of BMC and Builders FirstSource may obtain free copies of the Registration Statement, the definitive Joint Proxy Statement, and other documents (including any amendments or supplements thereto) containing important information about BMC and Builders FirstSource filed with the SEC, through the website maintained by the SEC at www.sec.gov. BMC and Builders FirstSource make available free of charge at ir.buildwithbmc.com and investors.bldr.com, respectively, copies of materials they file with, or furnish to, the SEC.

Participants in the Solicitation

BMC, Builders FirstSource, and their respective directors, executive officers, and other members of management and employees may be deemed to be participants in the solicitation of proxies from the stockholders of BMC and Builders FirstSource in connection with the proposed business combination.

The identity of BMC’s directors and executive officers and their ownership of BMC’s common stock is set forth in BMC’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on February 27, 2020, and its proxy statement for its 2020 Annual Meeting of Stockholders, which was filed with the SEC on March 27, 2020.

The identity of Builders FirstSource’s directors and executive officers and their ownership of the common stock of Builders FirstSource is set forth in Builders FirstSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on February 21, 2020, and its proxy statement for its 2020 Annual Meeting of Stockholders, which was filed with the SEC on April 28, 2020.

Investors may obtain additional information regarding the interest of such participants and a description of their direct and indirect interests, by security holdings or otherwise, by reading the Registration Statement, the Joint Proxy Statement, and other materials filed with the SEC in connection with the proposed business combination when they become available. You may obtain these documents free of charge through the website maintained by the SEC at www.sec.gov and from the websites of BMC or Builders FirstSource as described above.