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5/8/2019

Summit Materials, Inc. Reports First Quarter 2019 Results

- Net Revenue Growth of 5.5% in First Quarter 2019

- Organic aggregates volumes increased 6.6%

- Organic aggregates price increased 6.3%

- Reaffirmed 2019 Adjusted EBITDA Guidance Range For The Full-Year 2019 at $430 - $470 million

DENVER--(BUSINESS WIRE)-- Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”), a leading vertically integrated construction materials company, today announced results for the first quarter 2019.

For the three months ended March 30, 2019, the Company reported net loss attributable to Summit Inc. of $(68.8) million, or $(0.62) per basic share, compared to net loss attributable to Summit Inc. of $(53.7) million, or $(0.49) per basic share in the comparable prior year period. Summit reported adjusted diluted net loss of $(56.9) million, or $(0.49) per adjusted diluted share as compared to adjusted diluted net loss of $(62.9) million, or $(0.55) per adjusted diluted share in the prior year period.

Summit's net revenue increased 5.5% in the first quarter of 2019 compared to the comparable 2018 period, while net income and earnings per share decreased in 2019 as compared to the comparable 2018 period, primarily due to the $14.6 million loss on debt financing to redeem the 8.5% senior notes in March 2019. Adjusted EBITDA increased to $6.6 million in 2019 as compared to $5.5 million in 2018, as increases in aggregates and asphalt volumes and pricing were achieved. However, Summit noted those increases were offset by higher costs of revenue in its cement segment due to lower production levels during the quarter. Tom Hill, CEO of Summit Materials, stated, "We were very pleased to see our organic average sales prices for aggregates increased by 6.3% in the first quarter as compared to a year ago. We continue to believe end market fundamentals remain intact for the construction industry going into 2019." Hill commented, "Cement sales volumes were up slightly in the first quarter of 2019 as compared to 2018 despite challenging weather conditions. However, an extended annual maintenance shutdown and record flooding on the Mississippi River that has continued into the second quarter has negatively impacted our Cement business."

Summit reaffirmed its 2019 full year Adjusted EBITDA guidance. Hill continued, "We are pleased to confirm our previously announced Adjusted EBITDA guidance of approximately $430 million to $470 million for 2019."

“Underlying demand conditions in most of our markets remain favorable and are expected to remain so during the remainder of 2019,” continued Hill. In Summit's public markets, state transportation funding measures in Texas, coupled with steady increases in federal subsidies, are contributing to increased lettings activity. Single family housing starts and permits remain well below peak levels in Summit's major markets.

As previously announced, in February 2019 Summit extended and amended its revolving credit facility which now has maximum availability of $345 million and matures in 2024. Further, in March 2019, Summit retired $250 million of 8.5% senior notes due 2022 by issuing $300 million of 6.5% senior notes due in 2027. Brian Harris, CFO of Summit Materials, stated, “We were very pleased with both of those transactions, which increased our overall liquidity position and lowers our cash interest outlays in the future. Further, we are pleased to reaffirm our guidance for 2019 capital expenditures of approximately $160 million to $175 million." As expected, given the seasonal decrease in cash balances, Summit's leverage ratio increased over year-end levels. However, Summit continues to expect increased levels of cash flow generated from operations less capital expenditures in 2019 as compared to 2018, which we expect will allow Summit to reduce its leverage ratio by the end of 2019.

First Quarter 2019| Results by Line of Business

Aggregates Business: Aggregates net revenues increased by 30.3% to $87.9 million in the first quarter 2019, when compared to the prior year period. Aggregates adjusted cash gross profit margin improved to 43.2% in the first quarter 2019, compared to 41.5% in the prior year period, as pricing gains exceeded input costs. Organic aggregates sales volumes increased 6.6% in the first quarter 2019, when compared to the prior year period. Organic average selling prices on aggregates increased 6.3% in the first quarter 2019 when compared to the prior year period due to improvements in prices within both the West and East segments during the period.

Cement Business: Cement segment net revenues declined 0.7% to $37.3 million in the first quarter 2019, when compared to the prior year period. Cement adjusted cash gross profit margin decreased to 3.1% in the first quarter, compared to 19.5% in the prior year period, as margins were impacted by lower production levels in 2019. Organic sales volume of cement increased 1.0% in the first quarter, when compared to the prior year period. Organic average selling prices on cement decreased 1.5% in the first quarter, when compared to the prior year period due to changes of the customer mix across our geographies.

Products Business: Net revenues decreased 3.2% to $151.3 million in the first quarter 2019, when compared to the prior year period. Products adjusted cash gross profit margin declined to 13.5% in the first quarter, versus 16.1% in the prior year period, reflecting a 5.7% decrease in organic sales volumes of ready-mix concrete, which adversely impacted productivity and efficiency in the first quarter of 2019. This decrease was only partially offset by an increase in the organic average selling prices of 0.4% above the prior year period. Organic sales volumes of asphalt increased 20.0% in the first quarter and organic average selling prices increased 5.0% over the same period in 2018.

First Quarter 2019 | Results By Reporting Segment

Net revenue increased by 5.5% to $306.0 million in the first quarter 2019, versus $289.9 million in the prior year period. The improvement in net revenue was primarily attributable to both organic and acquisition-related contributions in the East and West segments, offset by a decline in the Cement segment. The Company reported operating loss of $(57.7) million in the first quarter 2019, compared to $(51.5) million in the prior year period. Adjusted EBITDA was $6.6 million in the first quarter 2019, compared to $5.5 million in the prior year period.

West Segment: The West Segment reported operating loss of $(11.6) million in the first quarter 2019, compared to $(6.1) million in the prior year period. Adjusted EBITDA decreased to $14.3 million in the first quarter 2019, compared to $16.2 million in the prior year period. The quarterly declines in West Segment operating income and Adjusted EBITDA were primarily attributable to increased labor and materials costs as well as increased depreciation and amortization from acquisitions completed in the last nine months of 2018, partially offset by increases in average selling prices on aggregates and asphalt concrete. Aggregates revenue in the first quarter increased 12.3% over the prior year period as a result of contributions from acquisitions, resulting in a 4.2% increase in organic volumes and a 4.7% increase in organic average sales prices. Ready-mix concrete revenue in the first quarter 2019 decreased 4.3% over the prior year period, primarily due to a 5.4% and 0.5% decrease in organic volumes and organic average sales prices, respectively, which were partially offset by an increase in acquisition related volumes. Asphalt revenue increased by 44.0% in the first quarter 2019 over the prior year period, resulting from a 22.8% and 1.6% increase in volumes and average sales prices, respectively.

East Segment: The East Segment reported operating loss of $(17.3) million in the first quarter 2019, compared to $(20.9) million in the prior year period. Adjusted EBITDA increased to $3.2 million in the first quarter 2019, compared to $(3.2) million in the prior year period. The quarterly improvement in East Segment operating loss and Adjusted EBITDA was mainly attributable to increases in net revenue from our acquisition program, increases in average selling prices of aggregates, ready-mix concrete and asphalt, partially offset by increased labor as well as decreases in ready-mix volumes. Aggregates revenue increased 36.8%, primarily due to increases resulting from our acquisition program as well as a 9.1% and 7.6% increase in organic volumes and average sales prices, respectively. Ready-mix concrete revenue decreased 2.7% as a result of lower sales volumes, partially offset by an increase in organic average sales prices. Asphalt revenue increased 47.3% primarily as a result of a 50.0% increase in organic average sales prices, partially offset by a 5.9% decrease in organic volumes.

Cement Segment: The Cement Segment reported operating loss of $(12.9) million in the first quarter 2019, compared to $(2.8) million in the prior year period primarily due to lower levels of production due to extended plant shutdowns in 2019, which resulted in higher costs of revenue as less production costs were capitalized into inventory. Adjusted EBITDA declined to $(2.6) million in the first quarter 2019, compared to $3.7 million in the prior year period, as total production in the first three months of 2019 was below production levels in the first three months of 2018. The Company experienced slightly lower organic average selling prices mostly offset by a slight increase in organic sales volumes during first quarter 2019 as compared to the prior year period.

Liquidity and Capital Resources

As of March 30, 2019, the Company had cash on hand of $64.8 million and borrowing capacity under its revolving credit facility of $329.8 million. The borrowing capacity on the revolving credit facility is fully available to the Company within the terms and covenant requirements of its credit agreement. As of March 30, 2019, the Company had $1.9 billion in debt outstanding.

Financial Outlook

For the full-year 2019, the Company estimates its Adjusted EBITDA to be in the range of $430 million to $470 million. For the full-year 2019, the Company estimates its capital expenditures to be in the range of $160 million to $175 million.

Webcast and Conference Call Information

Summit Materials will conduct a conference call today at 11:00 a.m. eastern time (9:00 a.m. mountain time) to review the Company’s first quarter financial results. A webcast of the conference call and accompanying presentation materials will be available in the Investors section of Summit’s website at investors.summit-materials.com. To listen to a live broadcast, go to the site at least 15 minutes prior to the scheduled start time in order to register, download, and install any necessary audio software.

To participate in the live teleconference:

Domestic Live:         1-877-407-0784 International Live: 1-201-689-8560 Conference ID: 57511368 To listen to a replay of the teleconference, which will be available through June 9, 2019:

Domestic Replay:         1-844-512-2921 International Replay: 1-412-317-6671 Conference ID: 13690428 About Summit Materials

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mix concrete and asphalt in the United States and British Columbia, Canada. Summit is a geographically diverse, materials-based business of scale that offers customers a single-source provider of construction materials and related downstream products in the public infrastructure, residential and nonresidential end markets. Summit has a strong track record of successful acquisitions since its founding and continues to pursue growth opportunities in new and existing markets. For more information about Summit Materials, please visit www.summit-materials.com.

Non-GAAP Financial Measures

The Securities and Exchange Commission (“SEC”) regulates the use of “non-GAAP financial measures,” such as Adjusted Net Income (Loss), Adjusted Diluted EPS, Adjusted EBITDA, Adjusted EBITDA Margin, Adjusted Cash Gross Profit, Adjusted Cash Gross Profit Margin, Free Cash Flow, Net Leverage and Net Debt which are derived on the basis of methodologies other than in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). We have provided these measures because, among other things, we believe that they provide investors with additional information to measure our performance, evaluate our ability to service our debt and evaluate certain flexibility under our restrictive covenants. Our Adjusted Net Income (Loss), Adjusted Diluted EPS, Adjusted EBITDA, Further Adjusted EBITDA, Adjusted EBITDA Margin, Adjusted Cash Gross Profit, Adjusted Cash Gross Profit Margin, Free Cash Flow, Net Leverage and Net Debt may vary from the use of such terms by others and should not be considered as alternatives to or more important than net income (loss), operating income (loss), revenue or any other performance measures derived in accordance with U.S. GAAP as measures of operating performance or to cash flows as measures of liquidity.

Adjusted EBITDA, Adjusted EBITDA Margin, and other non-GAAP measures have important limitations as analytical tools, and you should not consider them in isolation or as substitutes for analysis of our results as reported under U.S. GAAP. Some of the limitations of Adjusted EBITDA are that these measures do not reflect: (i) our cash expenditures or future requirements for capital expenditures or contractual commitments; (ii) changes in, or cash requirements for, our working capital needs; (iii) interest expense or cash requirements necessary to service interest and principal payments on our debt; and (iv) income tax payments we are required to make. Because of these limitations, we rely primarily on our U.S. GAAP results and use Adjusted EBITDA, Adjusted EBITDA Margin and other non-GAAP measures on a supplemental basis.

Adjusted EBITDA, Further Adjusted EBITDA, Adjusted EBITDA Margin, Adjusted Cash Gross Profit, Adjusted Cash Gross Profit Margin, Adjusted Net Income (Loss), Adjusted Diluted EPS, Free Cash Flow, Net Leverage and Net Debt reflect additional ways of viewing aspects of our business that, when viewed with our GAAP results and the accompanying reconciliations to U.S. GAAP financial measures included in the tables attached to this press release, may provide a more complete understanding of factors and trends affecting our business. We strongly encourage investors to review our consolidated financial statements in their entirety and not rely on any single financial measure. Reconciliations of the non-GAAP measures used in this press release are included in the attached tables. Because GAAP financial measures on a forward-looking basis are not accessible, and reconciling information is not available without unreasonable effort, we have not provided reconciliations for forward-looking non-GAAP measures. For the same reasons, we are unable to address the probable significance of the unavailable information, which could be material to future results.

Cautionary Statement Regarding Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. All statements made relating to our estimated and projected earnings, margins, costs, expenditures, cash flows, growth rates and financial results are forward-looking statements. These forward-looking statements are subject to risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by such forward-looking statements. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the effect of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be realized. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in Summit Inc.’s Annual Report on Form 10-K for the fiscal year ended December 29, 2018 as filed with the Securities and Exchange Commission (the “SEC”), any factors discussed in the section entitled “Risk Factors” in any of our subsequently filed SEC filings, and the following:

- our dependence on the construction industry and the strength of the local economies in which we operate;

- the cyclical nature of our business;

- risks related to weather and seasonality;

- risks associated with our capital-intensive business;

- competition within our local markets;

- our ability to execute on our acquisition strategy, successfully integrate acquisitions with our existing operations and retain key employees of acquired businesses;

- our dependence on securing and permitting aggregate reserves in strategically located areas;

- declines in public infrastructure construction and delays or reductions in governmental funding, including the funding by transportation authorities and other state agencies;

- environmental, health, safety and climate change laws or governmental requirements or policies concerning zoning and land use;

- rising prices for commodities, labor and other production and delivery costs as a result of inflation or otherwise;

- conditions in the credit markets;

- our ability to accurately estimate the overall risks, requirements or costs when we bid on or negotiate contracts that are ultimately awarded to us;

- material costs and losses as a result of claims that our products do not meet regulatory requirements or contractual specifications;

- cancellation of a significant number of contracts or our disqualification from bidding for new contracts;

- special hazards related to our operations that may cause personal injury or property damage not covered by insurance;

- our substantial current level of indebtedness;

- our dependence on senior management and other key personnel;

- supply constraints or significant price fluctuations in the electricity and petroleum-based resources that we use, including diesel and liquid asphalt;

- climate change and climate change legislation or regulations;

- unexpected operational difficulties;

- interruptions in our information technology systems and infrastructure; and

- potential labor disputes.

All subsequent written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by these cautionary statements. Any forward-looking statement that we make herein speaks only as of the date of this press release. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as required by law.

SUMMIT MATERIALS, INC. AND SUBSIDIARIES Consolidated Statements of Operations

($ in thousands, except share and per share amounts)

      Three months endedMarch 30,     March 31,20192018 Revenue: Product $ 271,641 $ 256,807 Service 34,309   33,109   Net revenue 305,950 289,916 Delivery and subcontract revenue 26,689   24,505   Total revenue 332,639   314,421   Cost of revenue (excluding items shown separately below): Product 213,726 197,433 Service 26,589   25,923   Net cost of revenue 240,315 223,356 Delivery and subcontract cost 26,689   24,505   Total cost of revenue 267,004   247,861   General and administrative expenses 67,610 69,861 Depreciation, depletion, amortization and accretion 55,388 46,958 Transaction costs 308   1,266   Operating loss (57,671 ) (51,525 ) Interest expense 30,105 28,784 Loss on debt financings 14,565 — Other income, net (2,803 ) (7,655 ) Loss from operations before taxes (99,538 ) (72,654 ) Income tax benefit (28,037 ) (16,706 ) Net loss (71,501 ) (55,948 ) Net loss attributable to Summit Holdings (1) (2,729 ) (2,219 ) Net loss attributable to Summit Inc. $ (68,772 ) $ (53,729 ) Loss per share of Class A common stock: Basic $ (0.62 ) $ (0.49 ) Diluted $ (0.62 ) $ (0.49 ) Weighted average shares of Class A common stock: Basic 111,811,679 110,659,098 Diluted 111,811,679 110,659,098 ________________________________________________________ (1)   Represents portion of business owned by pre-IPO investors rather than by Summit.     SUMMIT MATERIALS, INC. AND SUBSIDIARIES Consolidated Balance Sheets

($ in thousands, except share and per share amounts)

          March 30,     December 29,20192018(unaudited)(audited)Assets Current assets: Cash and cash equivalents $ 64,837 $ 128,508 Accounts receivable, net 195,411 214,518 Costs and estimated earnings in excess of billings 17,079 18,602 Inventories 214,038 213,851 Other current assets 19,245   16,061 Total current assets 510,610 591,540 Property, plant and equipment, less accumulated depreciation, depletion and amortization (March 30, 2019 - $837,896 and December 29, 2018 - $794,251) 1,799,941 1,780,132 Goodwill 1,195,262 1,192,028 Intangible assets, less accumulated amortization (March 30, 2019 - $8,656 and December 29, 2018 - $8,247) 18,051 18,460 Deferred tax assets, less valuation allowance (March 30, 2019 - $21,859 and December 29, 2018 - $19,366) 253,104 225,397 Operating lease right-of-use assets 34,403 — Other assets 49,990   50,084 Total assets $ 3,861,361   $ 3,857,641 Liabilities and Stockholders’ Equity Current liabilities: Current portion of debt $ 4,765 $ 6,354 Current portion of acquisition-related liabilities 37,422 34,270 Accounts payable 101,843 107,702 Accrued expenses 96,476 100,491 Current operating lease liabilities 8,098 — Billings in excess of costs and estimated earnings 10,656   11,840 Total current liabilities 259,260 260,657 Long-term debt 1,855,346 1,807,502 Acquisition-related liabilities 38,908 49,468 Tax receivable agreement liability 309,733 309,674 Noncurrent operating lease liabilities 27,200 — Other noncurrent liabilities 92,439   88,195 Total liabilities 2,582,886 2,515,496 Stockholders’ equity: Class A common stock, par value $0.01 per share; 1,000,000,000 shares authorized, 112,067,531 and 111,658,927 shares issued and outstanding as of March 30, 2019 and December 29, 2018, respectively 1,121 1,117 Class B common stock, par value $0.01 per share; 250,000,000 shares authorized, 99 shares issued and outstanding as of March 30, 2019 and December 29, 2018 — — Additional paid-in capital 1,200,503 1,194,204 Accumulated earnings 60,967 129,739 Accumulated other comprehensive income 4,265   2,681 Stockholders’ equity 1,266,856 1,327,741 Noncontrolling interest in Summit Holdings 11,619   14,404 Total stockholders’ equity 1,278,475   1,342,145 Total liabilities and stockholders’ equity $ 3,861,361   $ 3,857,641   SUMMIT MATERIALS, INC. AND SUBSIDIARIES Consolidated Statements of Cash Flows

($ in thousands)

          Three months endedMarch 30,     March 31,20192018 Cash flow from operating activities: Net loss $ (71,501 ) $ (55,948 ) Adjustments to reconcile net loss to net cash provided by operating activities: Depreciation, depletion, amortization and accretion 57,039 45,559 Share-based compensation expense 5,906 8,507 Net gain on asset disposals (1,735 ) (4,077 ) Non-cash loss on debt financings 2,850 — Change in deferred tax asset, net (28,028 ) (17,373 ) Other 47 1,579 (Increase) decrease in operating assets, net of acquisitions and dispositions: Accounts receivable, net 20,118 27,979 Inventories (705 ) (35,248 ) Costs and estimated earnings in excess of billings 1,541 (2,678 ) Other current assets (3,447 ) (3,202 ) Other assets 2,576 747 (Decrease) increase in operating liabilities, net of acquisitions and dispositions: Accounts payable (5,431 ) (7,742 ) Accrued expenses (6,963 ) (8,660 ) Billings in excess of costs and estimated earnings (1,195 ) (1,788 ) Tax receivable agreement liability 59 822 Other liabilities (1,807 ) 156   Net cash used in operating activities (30,676 ) (51,367 ) Cash flow from investing activities: Acquisitions, net of cash acquired (2,842 ) (113,993 ) Purchases of property, plant and equipment (62,188 ) (49,505 ) Proceeds from the sale of property, plant and equipment 2,797 7,788 Other (178 ) 1,500   Net cash used for investing activities (62,411 ) (154,210 ) Cash flow from financing activities: Proceeds from debt issuances 300,000 — Debt issuance costs (5,774 ) — Payments on debt (256,333 ) (3,972 ) Payments on acquisition-related liabilities (8,933 ) (8,962 ) Distributions from partnership — (9 ) Proceeds from stock option exercises 766 15,475 Other (501 ) (1,820 ) Net cash provided by financing activities 29,225   712   Impact of foreign currency on cash 191 (398 ) Net (decrease) increase in cash (63,671 ) (205,263 ) Cash and cash equivalents—beginning of period 128,508   383,556   Cash and cash equivalents—end of period $ 64,837   $ 178,293     SUMMIT MATERIALS, INC. AND SUBSIDIARIES Unaudited Revenue Data by Segment and Line of Business

($ in thousands)

      Three months ended     Twelve months endedMarch 30,   March 31,March 30,   March 31,2019201820192018 Segment Net Revenue: West $ 168,229 $ 168,944 $ 1,010,440 $ 936,962 East 100,415 83,421 634,308 548,790 Cement 37,306   37,551   280,544   297,529   Net Revenue $ 305,950   $ 289,916   $ 1,925,292   $ 1,783,281     Line of Business - Net Revenue: Materials Aggregates $ 87,872 $ 67,450 $ 394,246 $ 319,211 Cement (1) 32,499 33,117 258,258 275,723 Products 151,270   156,240   962,489   886,792   Total Materials and Products 271,641   256,807   1,614,993   1,481,726   Services 34,309   33,109   310,299   301,555   Net Revenue $ 305,950   $ 289,916   $ 1,925,292   $ 1,783,281     Line of Business - Net Cost of Revenue: Materials Aggregates $ 49,890 $ 39,482 $ 162,246 $ 113,429 Cement 31,351 25,788 140,160 131,673 Products 130,855   131,137   763,037   677,406   Total Materials and Products 212,096   196,407   1,065,443   922,508   Services 28,219   26,949   235,551   210,120   Net Cost of Revenue $ 240,315   $ 223,356   $ 1,300,994   $ 1,132,628     Line of Business - Adjusted Cash Gross Profit (2): Materials Aggregates $ 37,982 $ 27,968 $ 232,000 $ 205,782 Cement (3) 1,148 7,329 118,098 144,050 Products 20,415   25,103   199,452   209,386   Total Materials and Products 59,545   60,400   549,550   559,218   Services 6,090   6,160   74,748   91,435   Adjusted Cash Gross Profit $ 65,635   $ 66,560   $ 624,298   $ 650,653     Adjusted Cash Gross Profit Margin (2) Materials Aggregates 43.2 % 41.5 % 58.8 % 64.5 % Cement (3) 3.1 % 19.5 % 42.1 % 48.4 % Products 13.5 % 16.1 % 20.7 % 23.6 % Services 17.8 % 18.6 % 24.1 % 30.3 % Total Adjusted Cash Gross Profit Margin 21.5 % 23.0 % 32.4 % 36.5 % ________________________________________________________ (1)   Net revenue for the cement line of business excludes revenue associated with hazardous and non-hazardous waste, which is processed into fuel and used in the cement plants and is included in services net revenue. Additionally, net revenue from cement swaps and other cement-related products are included in products net revenue. (2) Adjusted cash gross profit is calculated as net revenue by line of business less net cost of revenue by line of business. Adjusted cash gross profit margin is defined as adjusted cash gross profit divided by net revenue. (3) The cement adjusted cash gross profit includes the earnings from the waste processing operations, cement swaps and other products. Cement line of business adjusted cash gross profit margin is defined as cement adjusted cash gross profit divided by cement segment net revenue.   SUMMIT MATERIALS, INC. AND SUBSIDIARIES Unaudited Volume and Price Statistics

(Units in thousands)

          Three months endedTotal VolumeMarch 30, 2019     March 31, 2018 Aggregates (tons) 10,207 8,814 Cement (tons) 297 294 Ready-mix concrete (cubic yards) 1,091 1,142 Asphalt (tons) 421 350   Three months endedPricingMarch 30, 2019March 31, 2018 Aggregates (per ton) $ 10.62 $ 9.86 Cement (per ton) 113.31 115.04 Ready-mix concrete (per cubic yards) 107.62 107.08 Asphalt (per ton) 54.62 52.04     Year over Year ComparisonVolumePricing Aggregates (per ton) 15.8 % 7.7 % Cement (per ton) 1.0 % (1.5 )% Ready-mix concrete (per cubic yards) (4.5 )% 0.5 % Asphalt (per ton) 20.3 % 5.0 %     Year over Year Comparison (Excluding acquisitions)VolumePricing Aggregates (per ton) 6.6 % 6.3 % Cement (per ton) 1.0 % (1.5 )% Ready-mix concrete (per cubic yards) (5.7 )% 0.4 % Asphalt (per ton) 20.0 % 5.0 %   SUMMIT MATERIALS, INC. AND SUBSIDIARIES Unaudited Reconciliations of Gross Revenue to Net Revenue by Line of Business

($ and Units in thousands, except pricing information)

      Three months ended March 30, 2019     Gross Revenue   Intercompany   NetVolumesPricingby ProductElimination/DeliveryRevenue Aggregates 10,207 $ 10.62 $ 108,388 $ (20,516 ) $ 87,872 Cement 297   113.31   33,600   (1,101 ) 32,499 Materials $ 141,988   $ (21,617 ) $ 120,371 Ready-mix concrete 1,091 107.62 117,428 (108 ) 117,320 Asphalt 421 54.62 23,009 (43 ) 22,966 Other Products 65,549   (54,565 ) 10,984 Products $ 205,986   $ (54,716 ) $ 151,270   SUMMIT MATERIALS, INC. AND SUBSIDIARIESUnaudited Reconciliations of Non-GAAP Financial Measures($ in thousands, except share and per share amounts)

The tables below reconcile our net loss to Adjusted EBITDA by segment for the three months ended March 30, 2019 and March 31, 2018.

Reconciliation of Net Loss to Adjusted EBITDA     Three months ended March 30, 2019by SegmentWest   East   Cement   Corporate   Consolidated ($ in thousands) Net loss (1) $ (9,552 ) $ (18,367 ) $ (10,568 ) $ (33,014 ) $ (71,501 ) Interest expense (income) (1) 743 1,008 (2,319 ) 30,673 30,105 Income tax (benefit) expense (443 ) 54 — (27,648 ) (28,037 ) Depreciation, depletion and amortization 23,796   19,905   10,154   952   54,807   EBITDA $ 14,544   $ 2,600   $ (2,733 ) $ (29,037 ) $ (14,626 ) Accretion 129 306 146 — 581 Loss on debt financings — — — 14,565 14,565 Transaction costs — — — 308 308 Non-cash compensation — — — 5,906 5,906 Other (375 ) 336   —   (107 ) (146 ) Adjusted EBITDA $ 14,298   $ 3,242   $ (2,587 ) $ (8,365 ) $ 6,588   Adjusted EBITDA Margin (1) 8.5 % 3.2 % (6.9 )% 2.2 %     Reconciliation of Net Income (Loss) to Adjusted EBITDAThree months ended March 31, 2018by SegmentWestEastCementCorporateConsolidated ($ in thousands) Net income (loss) $ 72 $ (21,644 ) $ (1,097 ) $ (33,279 ) $ (55,948 ) Interest expense (income) 1,180 606 (1,606 ) 28,604 28,784 Income tax benefit (382 ) (186 ) — (16,138 ) (16,706 ) Depreciation, depletion and amortization 22,008   17,512   6,313   710   46,543   EBITDA $ 22,878   $ (3,712 ) $ 3,610   $ (20,103 ) $ 2,673   Accretion 143 215 57 — 415 Transaction costs (4 ) — — 1,270 1,266 Non-cash compensation — — — 8,507 8,507 Other (2) (6,844 ) 294   —   (798 ) (7,348 ) Adjusted EBITDA $ 16,173   $ (3,203 ) $ 3,667   $ (11,124 ) $ 5,513   Adjusted EBITDA Margin (1) 9.6 % (3.8 )% 9.8 % 1.9 % _______________________________________________________ (1)   Adjusted EBITDA Margin is defined as Adjusted EBITDA as a percentage of net revenue. (2) In the three months ended March 31, 2018, we negotiated a $6.9 million reduction in the amount of a contingent liability from one of our acquisitions. As we had passed the period to revise the opening balance sheet for this acquisition, the adjustment was recorded as other income.   The table below reconciles our net loss per share attributable to Summit Materials, Inc. to adjusted diluted net loss per share for the three months ended March 30, 2019 and March 31, 2018. The per share amount of the net loss attributable to Summit Materials, Inc. presented in the table is calculated using the total equity interests for the purpose of reconciling to adjusted diluted net loss per share.

    Three months endedMarch 30, 2019     March 31, 2018Reconciliation of Net Loss Per Share to Adjusted Diluted EPSNet Loss   Per EquityUnit

Net Loss   Per EquityUnit

Net loss attributable to Summit Materials, Inc. $ (68,772 ) $ (0.60 ) $ (53,729 ) $ (0.47 ) Adjustments: Net loss attributable to noncontrolling interest (2,729 ) (0.02 ) (2,219 ) (0.02 ) Adjustment to acquisition deferred liability — — (6,947 ) (0.06 ) Loss on debt financings 14,565   0.13   —   —   Adjusted diluted net loss $ (56,936 ) $ (0.49 ) $ (62,895 ) $ (0.55 ) Weighted-average shares: Basic Class A common stock 111,811,679 110,659,098 LP Units outstanding 3,426,617   3,649,212   Total equity units 115,238,296   114,308,310     The following table reconciles operating loss to Adjusted Cash Gross Profit and Adjusted Cash Gross Profit Margin for the three months ended March 30, 2019 and March 31, 2018.

        Three months endedMarch 30,     March 31,Reconciliation of Operating Loss to Adjusted Cash Gross Profit20192018 ($ in thousands) Operating loss $ (57,671 ) $ (51,525 ) General and administrative expenses 67,610 69,861 Depreciation, depletion, amortization and accretion 55,388 46,958 Transaction costs 308   1,266   Adjusted Cash Gross Profit (exclusive of items shown separately) $ 65,635   $ 66,560   Adjusted Cash Gross Profit Margin (exclusive of items shown separately) (1) 21.5 % 23.0 % _______________________________________________________ (1)   Adjusted Cash Gross Profit Margin is defined as Adjusted Cash Gross Profit as a percentage of net revenue.   The following table reconciles net cash used for operating activities to free cash flow for the three months ended March 30, 2019 and March 31, 2018.

        Three months endedMarch 30,     March 31, ($ in thousands) 20192018 Net loss $ (71,501 ) $ (55,948 ) Non-cash items 36,079   34,195   Net loss adjusted for non-cash items (35,422 ) (21,753 ) Change in working capital accounts 4,746   (29,614 ) Net cash used in operating activities (30,676 ) (51,367 ) Capital expenditures, net of asset sales (59,391 ) (41,717 ) Free cash flow $ (90,067 ) $ (93,084 ) View source version on businesswire.com: https://www.businesswire.com/news/home/20190508005179/en/

Mr. Brian HarrisExecutive Vice President and Chief Financial OfficerSummit Materials, Inc.brian.harris@summit-materials.com

Source: Summit Materials, Inc.

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4/30/2019

Summit Materials Announces First Quarter 2019 Results Conference Call Date

DENVER--(BUSINESS WIRE)-- Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”), a leading vertically integrated construction materials company, today announced that it will release first quarter 2019 financial results before the market opens on Wednesday, May 8, 2019. A conference call will be held that same day at 11:00 a.m. eastern time (9:00 a.m. mountain time) to review Summit’s financial results, discuss recent events and conduct a question-and-answer session.

A webcast of the conference call and accompanying presentation materials will be available in the Investors section of Summit’s website at investors.summit-materials.com. To listen to a live broadcast, go to the site at least 15 minutes prior to the scheduled start time in order to register, download, and install any necessary audio software.

To participate in the live teleconference:

Domestic Live:         1-877-407-0784 International Live: 1-201-689-8560 Conference ID: 57511368   To listen to a replay of the teleconference, which will be available through March 6, 2019:

Domestic Replay:       1-844-512-2921 International Replay: 1-412-317-6671 Conference ID: 13690428   About Summit Materials, Inc.

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mix concrete and asphalt in the United States and British Columbia, Canada. Summit is a geographically diverse, materials-based business of scale that offers customers a single-source provider of construction materials and related downstream products in the public infrastructure, residential and non-residential end markets. Summit has a strong track record of successful acquisitions since its founding and continues to pursue growth opportunities in new and existing markets. For more information about Summit Materials, please visit www.summit-materials.com.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. Any and all statements made relating to the expectations for our anticipated benefits from recent acquisitions, the macroeconomic outlook for our markets, potential acquisition activity, our estimated and projected earnings, margins, costs, expenditures, cash flows, sales volumes and financial results are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that may change at any time, and, therefore, our actual results may differ materially from those expected. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the impact of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results.

In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 29, 2018. Such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov.

We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

View source version on businesswire.com: https://www.businesswire.com/news/home/20190430006127/en/

Mr. Brian HarrisExecutive Vice President and Chief Financial OfficerSummit Materials, Inc.brian.harris@summit-materials.com

Source: Summit Materials, Inc.

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2/28/2019

Summit Materials Announces Pricing of $300 Million of 6.500% Senior Notes Due 2027

DENVER--(BUSINESS WIRE)-- Summit Materials, Inc. (NYSE: SUM, “Summit”) announced today that its indirect subsidiaries Summit Materials, LLC and Summit Materials Finance Corp. (the “Issuers,” and, together with Summit, the “Company”) finalized the terms of the previously announced offering of $300 million aggregate principal amount of Senior Notes due 2027 (the “notes”). Summit anticipates that consummation of the offering will occur on February 28, 2019, subject to customary closing conditions. The Company intends to use the proceeds from the offering to redeem all $250.0 million in aggregate principal amount of its outstanding 8.5% Senior Notes due 2022 (the “2022 Notes”) and to pay fees and expenses incurred in connection with the offering and the redemption of the 2022 Notes. Any remaining net proceeds will be used for general corporate purposes, including to finance acquisitions.

The notes offered have not been and will not be registered under the Securities Act of 1933, as amended (the “Securities Act”), or any state securities laws and, unless so registered, may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws. The notes will be offered, by the initial purchasers, only to persons reasonably believed to be qualified institutional buyers in reliance on Rule 144A under the Securities Act and non-U.S. persons in transactions outside the United States in reliance on Regulation S under the Securities Act.

This press release is being issued pursuant to Rule 135(c) under the Securities Act, and it is neither an offer to sell nor a solicitation of an offer to buy any securities and shall not constitute an offer to sell or a solicitation of an offer to buy, or a sale of any securities in any jurisdiction in which such offer, solicitation or sale is unlawful.

About Summit Materials

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mix concrete and asphalt in the United States and British Columbia, Canada. Summit is a geographically diverse, materials-based business of scale that offers customers a single-source provider of construction materials and related downstream products in the public infrastructure, residential and nonresidential, and end markets. Summit has a strong track record of successful acquisitions since its founding and continues to pursue growth opportunities in new and existing markets.

Forward‐Looking Statements and Information:

This press release contains “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. Any and all statements made relating to the expectations for our anticipated benefits from recent acquisitions, the macroeconomic outlook for our markets, potential acquisition activity, our estimated and projected earnings, margins, costs, expenditures, cash flows, sales volumes and financial results are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that may change at any time, and, therefore, our actual results may differ materially from those expected. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the impact of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results.

In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 29, 2018. Such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov.

We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

View source version on businesswire.com: https://www.businesswire.com/news/home/20190228006034/en/

Summit Materials, Inc.Mr. Brian HarrisExecutive Vice President and Chief Financial Officer303-893-0012brian.harris@summit-materials.com

Source: Summit Materials, Inc.

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2/28/2019

Summit Materials Announces Intention to Offer $300 Million of Senior Notes

DENVER--(BUSINESS WIRE)-- Summit Materials, Inc. (NYSE: SUM, “Summit”) announced today that its indirect subsidiaries Summit Materials, LLC and Summit Materials Finance Corp. (the “Issuers”, and, together with Summit, the “Company”) intend to offer $300 million aggregate principal amount of Senior Notes due 2027 (the “notes”). The Company intends to use the proceeds from the offering to redeem all $250.0 million in aggregate principal amount of its outstanding 8.5% Senior Notes due 2022 (the “2022 Notes”) and to pay fees and expenses incurred in connection with the offering and the redemption of the 2022 Notes. Any remaining net proceeds will be used for general corporate purposes, including to finance acquisitions.

The notes to be offered have not been and will not be registered under the Securities Act of 1933, as amended (the “Securities Act”), or any state securities laws and, unless so registered, may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws. The notes will be offered, by the initial purchasers, only to persons reasonably believed to be qualified institutional buyers in reliance on Rule 144A under the Securities Act and non-U.S. persons in transactions outside the United States in reliance on Regulation S under the Securities Act.

This press release is being issued pursuant to Rule 135(c) under the Securities Act, and it is neither an offer to sell nor a solicitation of an offer to buy any securities and shall not constitute an offer to sell or a solicitation of an offer to buy, or a sale of any securities in any jurisdiction in which such offer, solicitation or sale is unlawful.

About Summit Materials

Summit Materials is a leading vertically integrated materials-based company that supplies aggregates, cement, ready-mix concrete and asphalt in the United States and British Columbia, Canada. Summit is a geographically diverse, materials-based business of scale that offers customers a single-source provider of construction materials and related downstream products in the public infrastructure, residential and nonresidential, and end markets. Summit has a strong track record of successful acquisitions since its founding and continues to pursue growth opportunities in new and existing markets.

Forward‐Looking Statements and Information:

This press release contains “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. Any and all statements made relating to the expectations for our anticipated benefits from recent acquisitions, the macroeconomic outlook for our markets, potential acquisition activity, our estimated and projected earnings, margins, costs, expenditures, cash flows, sales volumes and financial results are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that may change at any time, and, therefore, our actual results may differ materially from those expected. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the impact of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results.

In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 29, 2018. Such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov.

We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

View source version on businesswire.com: https://www.businesswire.com/news/home/20190228005536/en/

Mr. Brian HarrisExecutive Vice President and Chief Financial Officer303-893-0012brian.harris@summit-materials.com

Source: Summit Materials, Inc.

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