Exhibit 99.1

GMS REPORTS RESULTS FOR FIRST QUARTER OF FISCAL 2017

- Net Sales Increased 21.5% -

- Net Income Grew to $9.2 Million -

- Adjusted EBITDA Rose 34.7% to $45.9 Million -

Tucker, Georgia, September 13, 2016. GMS Inc. (NYSE:GMS), a leading North American distributor of wallboard and suspended ceilings systems, today reported financial results for the first quarter of fiscal 2017 ended July 31, 2016.

First Quarter Fiscal 2017 Highlights Compared to First Quarter Fiscal 2016

·                  Net sales increased 21.5% to $549.8 million; base business net sales up 9.2% despite one fewer shipping day

·                  Wallboard unit volume grew 20.0% to 818 million square feet

·                  Net income increased to $9.2 million, or $0.24 per share, compared to $3.0 million, or $0.09 per share

·                  Gross margin expanded 140 basis points to 32.5%

·                  Adjusted EBITDA margin improved approximately 80 basis points to 8.4% as a percentage of net sales

·                  Completed four acquisitions as of September 1, 2016, adding eight branches in five states

Mike Callahan, President and CEO of GMS, stated, “We are excited to produce our 20th straight quarter of double-digit growth in net sales, with strong results across all of our product categories to start the current fiscal year. Residential demand continued to outpace commercial activity in many markets, which particularly benefitted our wallboard and other product categories. The modest improvement in wallboard price compared to Q4 of last fiscal year was in line with expectations. Beyond our base business improvement, we completed four acquisitions during fiscal 2017 as of September 1, 2016, representing $134.9 million of combined trailing twelve month net sales. In June 2016, we used the proceeds from our successful initial public offering to further reduce debt and strengthen our balance sheet. In all, we are pleased with our progress and the dedication of the entire GMS family which is driving our continued success.”

First Quarter Fiscal 2017 Results

Net sales for the first quarter ended July 31, 2016 were $549.8 million, compared to $452.4 million for the first quarter ended July 31, 2015.

·                  Wallboard sales of $251.3 million increased 19.1%, compared to the first quarter of fiscal 2016. Wallboard unit volume grew 20.0% million to 818 million square feet, helped by greater end market demand and the positive contribution from acquisitions.

·                  Ceiling sales of $86.3 million rose 9.3%, compared to the first quarter of fiscal 2016, helped by improved pricing and acquisitions.

·                  Steel framing sales of $84.3 million grew 25.3%, compared to the first quarter of fiscal 2016, due to greater commercial activity and pricing gains as industry steel prices increased year-over-year, along with the benefit from accretive acquisitions.

·                  Other product sales of $127.8 million were up 34.2%, compared to the first quarter of fiscal 2016, attributable to greater end market demand, price gains, retail showrooms, acquisitions and other initiatives.

Gross profit of $178.6 million grew 26.8%, compared to $140.9 million in the first quarter of fiscal 2016. Gross margin of 32.5% expanded by 140 basis points, compared to 31.1% in the first quarter of fiscal 2016 mainly attributable to increased product margins.

Net income of $9.2 million, or $0.24 per share, increased $6.2 million, compared to $3.0 million, or $0.09 per share, in the first quarter of fiscal 2016. Adjusted net income of $17.8 million, or $0.47 per share, grew $6.5 million, compared to $11.3 million, or $0.35 per share, in the first quarter of fiscal 2016.

Adjusted EBITDA of $45.9 million rose 34.7%, compared to $34.1 million in the first quarter of fiscal 2016.  Adjusted EBITDA margin was 8.4% as a percentage of net sales for the first quarter of fiscal 2017, compared to 7.5% in the first quarter of fiscal 2016, largely reflecting a higher gross margin.

Capital Resources

On June 1, 2016, GMS completed the initial public offering of its common stock, raising net proceeds of approximately $157.2 million, including the full exercise of the underwriters’ option to purchase additional shares. Following completion of the offering, GMS had 40,942,905 of basic and 41,605,076 of diluted shares of common stock outstanding.

GMS used all of the net proceeds from its initial public offering, together with cash on hand, to repay, in full, its outstanding indebtedness of $160.0 million plus accrued and unpaid interest under its 7.75% senior secured second lien term loan facility due April 2022.

At July 31, 2016, GMS had cash of $9.8 million and total debt of $546.7 million, as compared to cash of $19.1 million and total debt of $644.6 million at April, 30, 2016.

Acquisition Activity

During the first quarter of fiscal 2017, the Company acquired Wall & Ceiling Supply Co., Inc., or Wall & Ceiling Supply, and Rockwise, LLC, or Rockwise, for a total purchase price of approximately $26.0 million. Wall & Ceiling Supply and Rockwise distribute wallboard and related building materials from four locations in Washington, Arizona and Colorado. For the twelve months ended April 30, 2016, the combined companies generated approximately $35.2 million in net sales and the earnings of these entities would have contributed approximately $4.5 million to Adjusted EBITDA for that period, including operating synergies.

Subsequent to July 31, 2016, the Company acquired Steven F. Kempf Building Materials, Inc., or SKBM, and Olympia Building Supplies, LLC, or Olympia, for a total purchase price of approximately $75.6 million. SKBM and Olympia distribute wallboard and related building materials from four locations in Pennsylvania and Florida. For the twelve months ended July 31, 2016, the combined companies generated approximately $99.7 million in net sales and the earnings of these entities would have contributed approximately $10.9 million to Adjusted EBITDA for that period, including operating synergies.

Conference Call and Webcast

The Company will host a conference call and webcast to discuss its results for the first quarter ended July 31, 2016 at 11:00 a.m. Eastern Time on September 13, 2016. Investors who wish to participate in the call should dial 877-407-0789 (domestic) or 201-689-8562 (international) at least 5 minutes prior to the start of the call. The live webcast will be available on the Investors section of the Company’s website at www.gms.com. There will be a slide presentation of the Company’s first quarter results available on that page of the website as well.  Replays of the call will be available through October 13, 2016 and can be accessed at 877-870-5176 (domestic) or 858-384-5517 (international) and entering the pass code 13644496.

About GMS Inc.

Founded in 1971, GMS operates a national network of distribution centers across the United States.  GMS’s extensive product offering of wallboard, suspended ceilings systems, or ceilings, and complementary interior construction products is designed to provide a comprehensive one-stop-shop for our core customer, the interior contractor who installs these products in commercial and residential buildings.

Use of Non-GAAP Financial Measures

GMS reports its financial results in accordance with GAAP. However, we present adjusted net income, Adjusted EBITDA, Adjusted EBITDA margin and base buisness growth, which are not recognized financial measures under GAAP.We believe adjusted net income, Adjusted EBITDA and Adjusted EBITDA margin assist investors and analysts in comparing our operating performance across reporting periods on a consistent basis by excluding items that we do not believe are indicative of our core operating performance. Management believes adjusted net income, Adjusted EBITDA, Adjusted EBITDA margin and base business growth are helpful in highlighting trends in our operating results, while other measures can differ significantly depending on long-term strategic decisions regarding capital structure, the tax jurisdictions in which companies operate and capital investments.  In addition, we utilize Adjusted EBITDA in certain calculations under our senior secured asset based revolving credit facility and our senior secured first lien term loan facility.

You are encouraged to evaluate each adjustment and the reasons we consider it appropriate for supplemental analysis. In addition, in evaluating adjusted net income and Adjusted EBITDA, you should be aware that in the future, we may incur expenses similar to the adjustments in the presentation of adjusted net income and Adjusted EBITDA. Our presentation of adjusted net income and Adjusted EBITDA should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items. In addition, adjusted net income and Adjusted EBITDA may not be comparable to similarly titled measures used by other companies in our industry or across different industries.

Forward-Looking Statements and Information:

This press release includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. You can generally identify forward-looking statements by our use of forward-looking terminology such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “seek,” or “should,” or the negative thereof or other variations thereon or comparable terminology. In particular, statements about the markets in which we operate, including the potential for growth in the commercial, residential and repair and remodeling, or R&R, markets, statements about our expectations, beliefs, plans, strategies, objectives, prospects, assumptions or future events or performance, statements related to net sales, gross profit and capital expenditures, as well as non-GAAP financial measures such as Adjusted EBITDA, adjusted net income and base business growth and statements regarding potential acquisitions and future greenfield locations contained in this press release are forward-looking statements. We have based these forward-looking statements on our current expectations, assumptions, estimates and projections. While we believe these expectations, assumptions, estimates and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown risks and uncertainties, many of which are beyond our control. Forward-looking statements involve risks and uncertainties, including, but not limited to, economic, competitive, governmental and technological factors outside of our control, that may cause our business, strategy or actual results to differ materially from the forward-looking statements. These risks and uncertainties may include, among other things: changes in the prices, supply, and/or demand for products which we distribute; general economic and business conditions in the United States; the activities of competitors; changes in significant operating expenses; changes in the availability of capital and interest rates; adverse weather patterns or conditions; acts of cyber intrusion; variations in the performance of the financial markets, including the credit markets; and other factors described in the “Risk Factors” section in our Annual Report on Form 10-K for the fiscal year ended April 30, 2016, and in our other periodic reports filed with the SEC.  In addition, the statements in this release are made as of September 13, 2016. We undertake no obligation to update any of the forward looking statements made herein, whether as a result of new information, future events, changes in expectation or otherwise. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to September 13, 2016.

GMS Inc.

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited)

(in thousands of dollars, except for share and per share data)

GMS Inc.

Condensed Consolidated Balance Sheets (Unaudited)

(in thousands of dollars, except share data)

GMS Inc.

Condensed Consolidated Statements of Cash Flows (Unaudited)

(in thousands of dollars)

GMS Inc.

Net Sales by Product Group (Unaudited)

(in thousands of dollars)

GMS Inc.

Reconciliation of Net Income to Adjusted EBITDA (Unaudited)

(in thousands of dollars)

(a)         Represents non-cash compensation expenses related to stock appreciation rights agreements

(b)         Represents non-cash compensation expense related to changes in the fair values of noncontrolling interests

(c)          Represents non-cash equity-based compensation expense related to the issuance of stock options

(d)         Represents severance and other costs permitted in calculations under the ABL Facility and the Term Loan Facilities

(e)          Represents one-time costs related to the IPO and acquisitions paid to third party advisors

(f)           Represents management fees paid to AEA, which were discontinued after the IPO

(g)          Non-cash cost of sales impact of purchase accounting adjustments to increase inventory to its estimated fair value

(h)         Mark to market adjustments for certain financial instruments

GMS Inc.

Reconciliation of Net Income to Adjusted Net Income (Unaudited)

(in thousands of dollars, except for share and per share data)

(1)         Depreciation and amortization from the increase in value of certain long-term assets associated with the April 1, 2014 acquisition of the predecessor company.

(2)         Normalized effective tax rate excluding the impact of purchase accounting and certain other deferred tax amounts.

Contact Information:

Investor Relations:

ir@gms.com

678-353-2883

Media Relations:

marketing@gms.com

770-723-3378