This Management's Discussion and Analysis of Financial Condition and Results of Operations is intended to assist in understanding and assessing the trends and significant changes in our results of operations and financial condition. Historical results may not be indicative of future performance. Forward-looking statements reflect our current views about future events, are based on assumptions and are subject to known and unknown risks and uncertainties that could cause actual results to differ materially from those contemplated by these statements. Factors that may cause differences between actual results and those contemplated by forward-looking statements include, but are not limited to, those discussed in the section entitled "Risk Factors" in the Annual Report, and factors discussed in the section entitled "Cautionary Note Regarding Forward-Looking Statements." This Management's Discussion and Analysis of Financial Condition and Results of Operations should be read in conjunction with our consolidated interim financial statements and the related notes and other information included in this report.

Overview

Summit's vision is to be the most socially responsible, integrated construction materials solution provider, collaborating with stakeholders to deliver differentiated innovations and solve our customers' challenges. Within our markets, we strive to be a market leader by offering customers a single-source provider for construction materials and related downstream products through our vertical integration. Our materials include aggregates, which we supply across the United States, and in British Columbia, Canada, and cement, which we supply to surrounding states along the Mississippi River from Minnesota to Louisiana. In addition to supplying aggregates to customers, we use a portion of our materials internally to produce ready-mix concrete and asphalt paving mix, which may be sold externally or used in our paving and related services businesses. Our vertical integration creates opportunities to increase aggregates volumes, optimize margin at each stage of production and provide customers with efficiency gains, convenience and reliability, which we believe gives us a competitive advantage.

Since our inception in 2009, we have completed dozens of acquisitions, which are organized into 11 operating companies that make up our three distinct operating segments: West, East and Cement, which are also our reporting segments. We operate in 21 U.S. states and in British Columbia, Canada and currently have assets in 21 U.S. states and in British Columbia, Canada. The map below illustrates our geographic footprint.


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Business Trends and Conditions

The U.S. construction materials industry is composed of four primary sectors: aggregates; cement; ready-mix concrete; and asphalt paving mix. Each of these materials is widely used in most forms of construction activity. Participants in these sectors typically range from small, privately-held companies focused on a single material, product or market to publicly traded multinational corporations that offer a wide array of construction materials and services. Competition is constrained in part by the distance materials can be transported efficiently, resulting in predominantly local or regional operations. Due to the lack of product differentiation, competition for all of our products is predominantly based on price and, to a lesser extent, quality of products and service. As a result, the prices we charge our customers are not likely to be materially different from the prices charged by other producers in the same markets. Accordingly, our profitability is generally dependent on the level of demand for our materials and products and our ability to control operating costs. We continue to monitor supply chain issues, as well as inflationary pressures on our raw material inputs as well as labor costs.

Our revenue is derived from multiple end-use markets including public infrastructure construction and private residential and nonresidential construction. Public infrastructure includes spending by federal, state, provincial and local governments for roads, highways, bridges, airports and other infrastructure projects. Public infrastructure projects have historically been a relatively stable portion of state and federal budgets. Residential and nonresidential construction consists of new construction and repair and remodel markets. Any economic stagnation or decline, which could vary by local region and market, could affect our results of operations. Our sales and earnings are sensitive to national, regional and local economic conditions and particularly to cyclical changes in construction spending, especially in the private sector. We continue to see positive indicators for the construction sector, including positive trends in housing starts, and highway construction letting


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Table of Contents activity in many of the states in which we operate. However, given the ongoing nature of the COVID-19 pandemic discussed below, we continue to closely monitor these indicators for the impact on our business in subsequent quarters.

Transportation infrastructure projects, driven by both federal and state funding programs, represent a significant share of the U.S. construction materials market. Federal funds are allocated to the states, which are required to match a portion of the federal funds they receive. Federal highway spending uses funds predominantly from the Federal Highway Trust Fund, which derives its revenue from taxes on diesel fuel, gasoline and other user fees. The dependability of federal funding allows state departments of transportation to plan for their long-term highway construction and maintenance needs. Through a continuing resolution signed by the President in October 2021, funding for the existing federal transportation funding program extends through December 3, 2021. Historically, Congress has maintained infrastructure spending via various means upon the expiration of federal transportation funding programs, but there is no assurance that this will continue to be the case. With the nation's infrastructure aging, there is increased demand by states and municipalities for long-term federal funding to support the construction of new roads, highways and bridges in addition to the maintenance of the existing infrastructure.

In addition to federal funding, state, county and local agencies provide highway construction and maintenance funding. Our four largest states by revenue, Texas, Utah, Kansas and Missouri, represented approximately 25%, 14%, 13% and 9%, respectively, of our total revenue in 2020. The following is a summary of key funding initiatives in those states:

•The Texas Department of Transportation ("TXDOT") updated its fiscal year 2022 lettings estimate to $10.1 billion up from $8.4 billion in fiscal year 2021 and $7.5 billion in fiscal year 2020. Longer term, TXDOT has indicated a target of $8 billion per year in total state and local lettings. In addition, Texas has received $1.9 billion from legislation passed by Congress in December 2020 and March 2021.

•The state of Utah anticipates transportation funding of approximately $1.3 billion in 2021 and $1.8 billion in 2022. In addition, Utah received approximately $263 million from legislation passed by Congress in December 2020 and March 2021.

•The state of Kansas anticipates approximately $1.9 billion for 2021 and $2.2 billion for 2022 for transportation funding. In addition, Kansas received approximately $138 million from legislation passed by Congress in December 2020 and March 2021.

•The state of Missouri anticipates transportation funding of approximately $2.9 billion in 2021 and $3.1 billion in 2022. In addition, Missouri received approximately $437 million from legislation passed by Congress in December 2020 and March 2021.

Use and consumption of our products fluctuate due to seasonality. Nearly all of the products used by us, and by our customers, in the private construction and public infrastructure industries are used outdoors. Our highway operations and production and distribution facilities are also located outdoors. Therefore, seasonal changes and other weather-related conditions, in particular extended rainy and cold weather in the spring and fall, as well as major weather events such as hurricanes, tornadoes, tropical storms, heavy snows and flooding, can adversely affect our business and operations through a decline in both the use of our products and demand for our services. In addition, construction materials production and shipment levels follow activity in the construction industry, which typically occurs in the spring, summer and fall. Warmer and drier weather during the second and third quarters of our fiscal year typically result in higher activity and revenue levels during those quarters. The first quarter of our fiscal year typically has lower levels of activity due to weather conditions, and the third quarter of our fiscal year typically has the highest levels of activity.

We are subject to commodity price risk with respect to price changes in liquid asphalt and energy, including fossil fuels and electricity for aggregates, cement, ready-mix concrete and asphalt paving mix production, natural gas for hot mix asphalt production and diesel fuel for distribution vehicles and production related mobile equipment. Liquid asphalt escalator provisions in most of our private and commercial contracts limit our exposure to price fluctuations in this commodity. We often obtain similar escalators on public infrastructure contracts. In addition, we enter into various firm purchase commitments, with terms generally less than one year, for certain raw materials, including diesel fuel.

Backlog

Our products are generally delivered upon receipt of orders or requests from customers, or shortly thereafter. Accordingly, the backlog associated with product sales is converted into revenue within a relatively short period of time. Inventory for products is generally maintained in sufficient quantities to meet rapid delivery requirements of customers. Therefore, a period-over-period increase or decrease of backlog does not necessarily result in an improvement or a deterioration


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Table of Contents of our business. Our backlog includes only those products and projects for which we have obtained a purchase order or a signed contract with the customer and does not include products purchased and sold or services awarded and provided within the period.

Financial Highlights

The principal factors in evaluating our financial condition and operating results as of and for the three and nine months ended October 2, 2021 as compared to the three and nine months ended September 26, 2020, and certain other highlights include:



•Net revenue increased $17.0 million and $116.4 million in the three and nine
months ended October 2, 2021, respectively, primarily resulting from organic
growth.
•Our operating income increased $24.4 million and $36.9 million in the three and
nine months ended October 2, 2021, respectively, as revenue exceeded the
increases in cost of revenue.
•In the nine months ended October 2, 2021, the Company sold four businesses in
the East segment and one in the West segment, resulting in cash proceeds of
$103.6 million and a total gain on disposition of $15.3 million.
•In the three and nine months ended October 2, 2021, sales volume increased 9.2%
and 14.1% in aggregates, 2.0% and 6.5% in cement, declined (1.4)% and increased
3.9% in ready-mix concrete and declined (11.2)% and (8.6)% in asphalt,
respectively.
•In September 2021, we redeemed all $300.0 million of 5.125% Senior Notes due
2025 (the "2025 Notes") using existing cash on hand. We recognized a loss on
debt financing of $6.0 million on this redemption.
•In August 2020, we issued $700 million of 5.25% Senior Notes due 2029 (the
"2029 Notes"), resulting in net proceeds of $690.4 million, after related fees
and expenses. The proceeds from the 2029 Notes were used to redeem the $650
million of 6.125% Senior Notes due 2023 (the "2023 Notes") at par.

Results of Operations

In late 2019, the COVID-19 virus was first reported to have surfaced, and began impacting countries around the world. However, in all of our markets, construction activities were deemed essential businesses and we continued to operate while many businesses were forced to close or reduce operations. During the first nine months of each of 2021 and 2020, our operating markets remained substantially unaffected by COVID-19. We continue to monitor our operations, the operations of our customers, and the recommendations of the various national, state and local governments in the areas in which we operate. We implemented work-from-home protocols at all of our administrative locations late in the first quarter of 2020, and while some locations have returned, other locations, including our headquarters location, continue to work remotely. In addition, we implemented additional safety measures specific to COVID-19 at all of our operating locations, which did not significantly increase our costs. The extent to which the COVID-19 pandemic impacts the national and local economies in which we operate, and ultimately our business, will depend on numerous developments, which are highly uncertain and difficult to predict. These events, as they continue to develop, could result in business disruption, including reduced revenues, profitability and cash flow.

In 2020, approximately 61% of our revenue was derived from the private construction market, and the remaining revenue from the public markets. We believe residential activity in our key markets will continue to be a driver for volumes in future periods. Funding for public infrastructure projects as been announced as a high priority for the federal government in 2021, but no action has been taken to date.

As of October 2, 2021, we had $258.1 million in cash and cash equivalents, and we have remaining borrowing capacity on our senior secured revolving credit facility of $329.1 million, providing us with liquidity that we believe to be adequate to meet our obligations for the next twelve months.

The following discussion of our results of operations is focused on the key financial measures we use to evaluate the performance of our business from both a consolidated and operating segment perspective. Operating income and margins are discussed in terms of changes in volume, pricing and mix of revenue source (i.e., type of product, sales or service revenue). We focus on operating margin, which we define as operating income as a percentage of net revenue, as a key metric when assessing the performance of the business, as we believe that analyzing changes in costs in relation to changes in revenue provides more meaningful insight into the results of operations than examining costs in isolation.

Operating income reflects our profit from operations after taking into consideration cost of revenue, general and administrative expenses, depreciation, depletion, amortization and accretion and gain on sale of property, plant and equipment.


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Table of Contents Cost of revenue generally increases ratably with revenue, as labor, transportation costs and subcontractor costs are recorded in cost of revenue. As organic volumes increase, we expect our general and administrative costs as a percentage of revenue to decrease. General and administrative expenses as a percentage of revenue vary throughout the year due to the seasonality of our business.

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