impact arising from environmental laws and regulations is neither clearly known nor determinable as existing standards are subject to change and new standards or more stringent enforcement programs continue to evolve.

We have incurred and will continue to incur operating and capital expenditures, some of which may be material, to comply with environmental and occupational health and safety laws and regulations. The trend in environmental regulation is to place more restrictions on activities that may affect the environmentregulations and thus, any new laws and regulations, amendment of existing laws and regulations, reinterpretation of legal requirements or increased governmental enforcement that result in more stringent and costly pollution control equipment, the occurrence of restrictions, delays or cancellations in the permitting or performance of projects, or waste handling, storage, transport, disposal or remediation requirements could have a material adverse effect on our operations and financial position. Historically, our environmental compliance costs have not had a material adverse effect on our results of operations; however, there can be no assurance that such costs will not be material in the future or that such future compliance will notmay have a material adverse effect on our business and operational results.  Itresults in the future.

If existing regulatory requirements or enforcement policies change or new regulatory or enforcement initiatives are developed and implemented in the future, we or our customers may be required to make significant, unanticipated capital and operating expenditures. Examples of recent regulations or other regulatory initiatives in the United States include the following:

Available Information

We are required to file any annual, quarterly and current reports, proxy statements and certain other information with the Securities and Exchange Commission (the “SEC”).

The SEC maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC. Any documents filed by us with the SEC, including this Annual Report, can be downloaded from the SEC's website.

Our principal executive offices are located at 9811 Katy Freeway, Suite 700, Houston, Texas 77024, and our telephone number is (281) 501-3070. Our website is at www.solarisoilfield.com. Our periodic reports and other information filed with or furnished to the SEC, pursuant to Section 13(a) or 15(d) of the Exchange Act, including Annual Reports on Form 10-K and 10-K/A, quarterly reports on Form 10-Q and Form 10-Q/A, current reports on Form 8-K, and amendments to those reports are available, free of charge, through our website, as soon as reasonably practicable after those reports and other information are electronically filed with or furnished to the SEC. Information on our website or any other website is not incorporated by reference into this Annual Report and does not constitute a part of this Annual Report.

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The volatility of oil and natural gas prices may adversely affect the demand for our systems, products and services, and negatively impact our results of operations.

The demand for our products and services is primarily determined by current and anticipated oil and natural gas prices and the related levels of capital spending and drilling activity in the areas in which we have operations. The COVID-19 pandemic, combined with a period of increased production from major oil producing nations and decreasing availability of crude oil storage, contributed to lower commodity prices compared to historical levels, both of which are expected to continue to impact demand over the short-to-medium term. Volatility or weakness in oil prices or natural gas prices (or the perception that oil prices or natural gas prices will decrease or remain stagnant) affects the spending patterns of our customers and may result in the drilling of fewer new wells. As a result, demand for proppants or chemicals may decrease, which could, in turn, lead to lower demand for our products and services and may cause lower prices and lower utilization of our assets. We have, and may in the future, experienced significant fluctuations in operating results as a result of the reactions of our customers to changes in oil and natural gas prices. For example, prolonged low commodity prices experienced by

Events outside of our control, including a pandemic or outbreak of an infectious disease, such as the oilglobal COVID-19 pandemic, political unrest and natural gas industry beginning in late 2014economic recessions occurring around the globe, could materially adversely affect our business, liquidity, results of operations and uncertainty about future prices even when prices increased, combined with adverse changes infinancial condition.

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We face risks that are outside of our control which could significantly disrupt the capital and credit markets, caused many E&P companies to significantly reduce their capital budgets and drilling activity in recent years. This resulted in a significant decline in demand for oilfield services and adversely impacted the prices oilfield services companies could charge for their services.

Prices for oil and natural gas historicallyand our products and services, and adversely impact our operations and financial condition. These risks include, but are not limited to:

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The degree to which events outside of our control adversely impacts our results will also depend on future developments, which are highly uncertain and cannot be predicted, including the timing, extent, trajectory and duration of the COVID-19 pandemic, the development, availability and administration of effective treatments and vaccines and the impact of the pandemic on the global economy and any subsequent recovery of normal economic and operating conditions.

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These factors collectively have been extremely volatilecontributed to unprecedented negative global economic impacts, including a significant decrease in demand, and are expected towhich such impacts may continue into the future. While we expect these matters

We may be adversely affected by uncertainty in the global financial markets and the deterioration of the financial condition of our customers.

Our future results may be impacted by the uncertainty caused by an economic downturn, volatility or deterioration in the debt and equity capital markets, inflation, deflation or other adverse economic conditions that may negatively affect us or partiescompliance with whom we do business resulting in a reduction in our customers' spending and their non-payment or inability to perform obligations owed to us, such as the failure of customers to honor their commitments or the failure of major suppliers to complete orders. Additionally, during times when the natural gas or crude oil markets weaken, our customers are more likely to experience financial difficulties, including being unable to access debt or equity financing, which could result in a reduction in our customers' spending for our systems and services. In addition, in the course of our business we hold accounts receivable from our customers. In the event of the financial distress or bankruptcy of a customer, we could lose all or a portion of such outstanding accounts receivable associated with that customer. Further, if a customer was to enter into bankruptcy, it could also result in the cancellation of all or a portion of our service contracts with such customer at significant expense or loss of expected revenues to us.

Reliance upon a few large customers may adversely affect our revenue and operating results.

During the years ended December 31, 2019 and 2018, our top three customers collectively represented approximately 39% and 35%, respectively, of our consolidated revenue. It is likely that we will continue to derive a significant portion of our revenue from a relatively small number of customers in the future. If a major customer fails to pay us, revenue would be impacted and our operating results and financial condition could be materially harmed. Additionally, we typically do not enter into long-term contractual agreements with our customers and if we were to lose any material customer, we may not be able to redeploy our equipment at similar utilization or pricing levels or within a short period of time and such loss could have a material adverse effect on our business until the equipment is redeployed at similar utilization or pricing levels.

The Kingfisher Facility currently operates under spot contracts without any commitments for future business. We may not be able to obtain long-term contracts with customers for contracted volumes on favorable terms, or at all, which could adversely affect our financial results.

The Kingfisher Facility currently operates with its customers on a spot, uncommitted basis. Our ability to enter into additional contracts with customers or add additional customer contracts on a long-term committed basis is subject to a number of factors, many of which are beyond our control. Any failure to obtain customers at the Kingfisher Facility or the loss of all or a portion of the revenues attributable to our existing customers as a result of competition, creditworthiness, inability to negotiate extensions or replacement of contracts or otherwise, could have a material adverse effect on our business, financial condition, prospects or results of operations.

We are exposed to the credit risk of our customers, and any material nonpayment or nonperformance by our customers could adversely affect our financial results.

We are subject to the risk of loss resulting from nonpayment or nonperformance by our customers, many of whose operations are concentrated solely in the domestic E&P industry which, as described above, is subject to volatility and, therefore, credit risk. Our credit procedures and policies may not be adequate to fully reduce customer credit risk. If we are unable to adequately assess the creditworthiness of existing or future customers or unanticipated deterioration in their creditworthiness, any resulting increase in nonpayment or nonperformance by them and our inability to re-market or otherwise use our equipment could have a material adverse effect on our business, financial condition, prospects or results of operations.

If we are unable to fully protect our intellectual property rights, we may suffer a loss in our competitive advantage or market share.

Our commercial success depends on our patented and proprietary information and technologies, know-how and other intellectual property. Because of the technical nature of our business, we rely on a combination of patent, copyright, trademark and trade secret laws, and restrictions on disclosure to protect our intellectual property. In particular, as of December 31, 2019, we had three patents issued with respect to our mobile proppant management

system design and one patent issued with respect to the lifting and lowering mechanism utilized by our systems to erect and lower their silos. We also have four pending utility patent applications and three provisional patent applications. We customarily enter into confidentiality or license agreements with our employees, consultants and corporate partners and control access to and distribution of our design information, documentation and other patented and proprietary information. In addition, in the future we may acquire additional patents or patent portfolios, which could require significant cash expenditures. However, third parties may knowingly or unknowingly infringe our patent or other proprietary rights, third parties may challenge patents or proprietary rights held by us, and pending and future trademark and patent applications may not be approved. Failure to protect, monitor and control the use of our existing intellectual property rights could cause us to lose our competitive advantage and incur significant expenses. It is possible that our competitors or others could independently develop the same or similar technologies or otherwise obtain access to our unpatented technologies. In such case, our trade secrets would not prevent third parties from competing with us. Consequently, our results of operations may be adversely affected. Furthermore, third parties or our employees may infringe or misappropriate our patented or proprietary technologies or other intellectual property rights, which could also harm our business and results of operations. Policing unauthorized use of intellectual property rights can be difficult and expensive, and adequate remedies may not be available.

We may be adversely affected by disputes regarding intellectual property rights of third parties.

Third parties from time to time may initiate litigation against us by asserting that the conduct of our business infringes, misappropriates or otherwise violates intellectual property rights. We may not prevail in any such legal proceedings related to such claims, and our systems may be found to infringe, impair, misappropriate, dilute or otherwise violate the intellectual property rights of others. If we are sued for infringement and lose, we could be required to pay substantial damages and/or be enjoined from using or selling the infringing products or technology. Any legal proceeding concerning intellectual property could be protracted and costly regardless of the merits of any claim and is inherently unpredictable and could have a material adverse effect on our financial condition, regardless of its outcome.

If we were to discover that our technologies or products infringe valid intellectual property rights of third parties, we may need to obtain licenses from these parties or substantially re-engineer our products in order to avoid infringement. We may not be able to obtain the necessary licenses on acceptable terms, or at all, or be able to re-engineer our products successfully. If our inability to obtain required licenses for our technologies or products prevents us from selling our products, that could adversely impact our financial condition and results of operations.

Additionally, we currently license certain third-party intellectual property in connection with our business, and the loss of any such license could adversely impact our financial condition and results of operations.

Our business is subject to inherent risks some of which are beyond our control. These risks may be self-insured or may not be fully covered under our insurance policies.

Our assets and operations may be affected by natural or man-made disasters and other external events such as extreme weather events that may disrupt our business, including manufacturing and field operations. These hazards can also cause personal injury and loss of life, severe damage to and destruction of property and equipment, pollution or environmental damage, and suspension or cancellation of operations. In addition, our operations are subject to, and exposed to, employee/employer liabilities and risks such as wrongful termination, discrimination, labor organizing, retaliation claims and general human resource related matters.

The occurrence of a significant event or adverse claim in excess of the insurance coverage that we maintain or that is not covered by insurance could have a material adverse effect on our liquidity, results of operations and financial condition. Claims for loss of oil and natural gas production and damage to formations can occur in our industry. Litigation arising from a catastrophic occurrence at a location where our systems are deployed or services are provided may result in our being named as a defendant in lawsuits asserting large claims.

We do not have insurance against all foreseeable risks, either because insurance is not available or because of the high premium costs. The occurrence of an event not fully insured against or the failure of an insurer to meet its insurance obligations could result in substantial losses. In addition, we may not be able to maintain adequate insurance in the future at rates we consider reasonable. Insurance may not be available to cover any or all of the risks to which we are subject,

or, even if available, it may be inadequate, or insurance premiums or other costs could rise significantly in the future so as to make such insurance prohibitively expensive.

Our assets require capital for maintenance, upgrades and refurbishment and may require significant capital expenditures for new equipment.

Our systems and facilities require capital investment in maintenance, upgrades and refurbishment to maintain their competitiveness. The costs of components and labor have increased in the past and may increase in the future with increases in demand, which will require us to incur additional costs to upgrade our facilities or any systems we may manufacture in the future. Any maintenance, upgrade or refurbishment project for our assets could increase our indebtedness or reduce cash available for other opportunities. Furthermore, such projects may require proportionally greater capital investments as a percentage of total asset value, which may make such projects difficult to finance on acceptable terms. To the extent we are unable to fund such projects, we may have less equipment available for service or our equipment may not be attractive to potential or current customers. Additionally, competition or advances in technology within our industry may require us to update or replace existing facilities or systems or build or acquire new ones. Such demands on our capital or reductions in demand for our products and services and the increase in cost of labor necessary for such maintenance and improvement, in each case, could have a material adverse effect on our business, liquidity position, financial condition, prospects and results of operations and may increase our costs.

We rely on a limited number of third-party manufacturers to supplement our internal production capacity during periods of peak demand, and delays in deliveries of any outsourced components or increases in the cost of such outsourced components could harm our business, results of operations and financial condition.

We have established relationships with a limited number of manufacturers that fabricate certain components of our systems during periods of peak demand to supplement our internal production capacity. Should any of these third-party manufacturers be unable to provide or otherwise fail to deliver such components in a timely manner and in the quantities and at the quality required, any resulting delays in the provision of such components could have a material adverse effect on our business, results of operations and financial condition. Additionally, increasing costs of manufacturing such outsourced components may negatively impact demand for our systems or the profitability of our business operations.

We currently rely on a limited number of suppliers for certain equipment and materials to build and maintain our systems, and our reliance on a limited number of suppliers for such equipment and materials exposes us to risks including price and timing of delivery.

We currently rely on a limited number of suppliers for equipment and materials to build and maintain our systems. If demand for our systems or the components necessary to build and maintain such systems increases or our suppliers for our equipment face financial distress or bankruptcy, our suppliers may not be able to provide such equipment on schedule at the current price or at all. In particular, steel is the principal raw material used in the manufacture of our systems, and the price of steel has historically fluctuated on a cyclical basis and has often depended on a variety of factors over which we have no control. Additionally, we depend on a limited number of suppliers for the motors that we use in our systems, which are a critical component. If our suppliers are unable to provide the raw materials and components needed to build and maintain our systems at the current price or at all, we could be required to seek other suppliers for the raw materials and components needed to build, maintain and operate our systems, which may adversely affect our revenues or increase our costs. Any inability to find alternative components at prices or with quality specifications similar to those deployed today could result in delays or a loss of customers.

Our business depends on our customers having access to an adequate supply of proppant to meet their needs.

There have been historical shortages of proppant during various periods. Because our business depends upon the availability of proppant to our customers, any future proppant shortages could decrease the demand for our products and services and have a material adverse effect on our operations, prospects and financial condition.

Changes in the transportation industry, including fluctuations in transportation costs, changes in the way in which proppant or chemicals are transported to the well site or the availability or reliability of transportation to supply our proppant or chemical management systems and transloading services,  could impair the ability of our customers to take delivery of proppant or chemicals or make our products and services less attractive and thereby adversely impact our business.

Disruption of proppant or chemical transportation services due to shortages of rail cars or trucks, extreme weather-related events including rising sea levels, flooding and drought, accidents, mechanical difficulties, strikes, lockouts, bottlenecks, more stringent railcar or safety regulatory initiatives, or other events could temporarily impair the ability of our customers to take delivery of proppant or chemicals at the well site or our ability to provide transloading services. Accordingly, if there are disruptions of the services utilized by our customers (whether these services are provided by us or a third party), including but not limited to disruptions in the rail industry or a shortage of qualified motor carriers, and they are unable to find alternative transportation providers to transport proppant or chemicals to the well site, our business could be adversely affected. Additionally, alternative transportation methods for transporting and delivering proppant or chemicals to the well site could make our product offerings less attractive than those of our competitors and affect our results of operations.

Additionally, any disruptions in transportation services associated with delivery of our proppant or chemical management systems, or provision of last mile services, could result in reduced revenue associated with such systems or services, or the loss of customers.

A number of our customers operate in urban areas, which could increase the costs of deploying our systems and/or decrease the demand for our systems.

A number of our current and potential customers operate in urban areas, which could disproportionately expose them to operational and regulatory risk in that area. For example, operations within the city limits of various municipalities in Colorado may involve additional expenses as a result of changes in state law during 2019 that elevated the authority and regulatory oversight that local communities may exercise with respect to oil and gas developmental activities in the state, including expenses relating to limitations placed on operating hours or mitigation of noise, odor and light that may be emitted during operation. In addition, we and our customers may experience a higher rate of litigation or increased insurance and other costs related to operating in such highly populated areas.

We may have difficulty managing growth of our business, which could adversely affect our financial condition and results of operations.

Growth of our business could place a significant strain on our financial, technical, operational and management resources. As we expand the scope of our activities and our geographic coverage through organic growth, there will be additional demands on our financial, technical, operational and management resources. The failure to continue to upgrade our technical, administrative, operating and financial control systems or the occurrences of unexpected expansion difficulties, including the failure to recruit and retain experienced managers, engineers and other professionals in the oilfield services industry, could have a material adverse effect on our business, financial condition, results of operations and our ability to successfully or timely execute our business plan.

Federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing as well as governmental reviews of such activities may serve to limit future oil and natural gas exploration and production activities and could have a material adverse effect on our results of operations and business.

Hydraulic fracturing is an important and commonly used process for the completion of oil and natural gas wells in targeted subsurface formations with low permeability, such as shale formations, and involves the pressurized injection of water, sand or other proppants and chemical additives into rock formations to stimulate oil and natural gas production. We do not conduct hydraulic fracturing but we manufacture specialized equipment that, combined with field products and well site storage and management of proppant and chemicals used by hydraulic fracturing operators in the oil and natural gas industry. In addition, we are able to provide transloading and other logistics services for our customers.

Hydraulic fracturing is an important and common practice that is typically regulated by state oil and natural gas commissions or similar agencies. However, the practice continues to be controversial in certain parts of the country, resulting in increased scrutiny and regulations of the fracturing process, including by federal agencies that has resulted in the assertion of regulatory authority or performance of investigations over certain aspects of the hydraulic fracturing process. For example, the EPA has asserted regulatory authority pursuant to the SDWA Underground Injection Control program over hydraulic fracturing activities involving the use of diesel and issued guidance covering such activities, as well as published an Advanced Notice of Proposed Rulemaking regarding Toxic Substances Control Act reporting of the chemical substances and mixtures used in hydraulic fracturing.  The EPA also published final rules under the CAA in 2012 and in 2016 governing performance standards, including standards for the capture of air emissions released during oil and natural gas hydraulic fracturing.  Additionally, in 2016, the EPA published an effluent limit guideline final rule prohibiting the discharge of wastewater from onshore unconventional oil and natural gas extraction facilities to publicly owned wastewater treatment plants. Also, in late 2016, the EPA released its final report on the potential impacts of hydraulic fracturing on drinking water resources, concluding that "water cycle" activities associated with hydraulic fracturing may impact drinking water resources under some circumstances.

Legislation has been introduced in United States Congress from time to time to provide for federal regulation of hydraulic fracturing and to require disclosure of the chemicals used in the hydraulic fracturing process but, to date, such legislation has not been adopted. Also, some states and local governments have adopted, and other governmental entities have, from time to time, considered adopting, regulations that could impose more stringent permitting, disclosure and well-construction requirements on hydraulic fracturing operations, including states where we or our customers operate. For example, in April 2019, the Governor of Colorado signed Senate Bill 19-181 into law, which legislation, among other things, revises the mission of the state oil and gas agency from fostering energy development in the state to instead focusing on regulating the oil and natural gas industry in a manner that is protective of public health and safety and the environment, as well as authorizing cities and counties to regulate oil and natural gas operations within their jurisdiction as they do other developments. Among other things, the Colorado oil and gas agency will consider enhanced safety and environmental protections during well development operations, including drilling and hydraulic fracturing activities.   States could also elect to place prohibitions on hydraulic fracturing altogether, following the approach taken by the States of Maryland, New York and Vermont. Local governments may also seek to adopt ordinances within their jurisdictions regulating the time, place or manner of drilling activities in general or hydraulic fracturing activities in particular.

Moreover, our customers typically dispose of flowback and produced water or certain other oilfield fluids gathered from oil and natural gas producing operations in underground disposal wells. This disposal process has been linked to increased induced seismicity events in certain areas of the country, particularly in Oklahoma, Texas, Colorado, Kansas, New Mexico and Arkansas. These and other states have begun to consider or adopt laws and regulations that may restrict or otherwise prohibit oilfield fluid disposal in certain areas or underground disposal wells, and state agencies implementing these requirements may issue orders directing certain wells where seismic incidents have occurred to restrict or suspend disposal well operations or impose standards related to disposal well construction and monitoring. Any one or more of these developments may result in our customers having to limit disposal well volumes, disposal rates or locations, or require our customers or third party disposal well operators that are used by our customers to cease disposal well activities, which developments could adversely affect our customers' business and result in a corresponding decrease in the need for our systems and services, which could have a material adverse effect on our business, financial condition, and results of operations.

Additionally, non-governmental organizations may seek to restrict hydraulic fracturing, as has been the case in Colorado in recent years, when certain interest groups therein have, thus far, unsuccessfully pursued ballot initiatives in recent general election cycles that, had they been successful, would have revised the state constitution or state statutes in a manner that would have made exploration and production activities in the state more difficult or costly in the future including, for example, by increasing mandatory setback distances of oil and natural gas operations, including hydraulic fracturing, from specific occupied structures and/or certain environmentally sensitive or recreational areas. Notwithstanding the adoption of Colorado Senate Bill 19-181 in 2019, one or more interest groups in the state have already filed new ballot initiatives with the state in January 2020, in hopes of extending drilling setbacks from oil and natural gas development.

Increased regulation and attention given to the hydraulic fracturing process and associated processes could lead to greater opposition to, and litigation concerning, oil and natural gas production activities using hydraulic fracturing techniques. Additional legislation or regulation could also lead to operational delays for our customers or increased operating costs in the production of oil and natural gas, including from developing shale plays, or could make it more difficult for our customers to perform hydraulic fracturing. The adoption of any federal, state or local laws or ballot initiatives, or the implementation of any regulations, regarding hydraulic fracturing could potentially cause a decrease in the completion of new oil and natural gas wells and an associated decrease in demand for our products and services and increased compliance costs and time, which could have a material adverse effect on our liquidity, results of operations, and financial condition.

Finally, water is an essential component of shale oil and natural gas production during both the drilling and hydraulic fracturing processes. Our customers' access to water to be used in these processes may be adversely affected due to reasons such as periods of extended drought, private, third party competition for water in localized areas or the implementation of local or state governmental programs to monitor or restrict the beneficial use of water subject to their jurisdiction for hydraulic fracturing to assure adequate local water supplies. Our customers' inability to locate or contractually acquire and sustain the receipt of sufficient amounts of water could adversely impact their exploration and production operations and have a corresponding adverse effect on our business, results of operations and financial condition.

Changes in transportation regulations may increase our costs and negatively impact our results of operations.

We are subject to various transportation regulations, including as a motor carrier by the United States Department of Transportation and by various federal, state and tribal agencies, whose regulations include certain permit requirements of highway and safety authorities. These regulatory authorities exercise broad powers over our trucking operations, generally governing such matters as the authorization to engage in motor carrier operations, safety, equipment testing, driver requirements and specifications and insurance requirements. The trucking industry is subject to possible regulatory and legislative changes that may impact our operations, such as changes in fuel emissions limits, hours of service regulations that govern the amount of time a driver may drive or work in any specific period and limits on vehicle weight and size. As the federal government continues to develop and proposeOSHA regulations relating to fuel quality, engine efficiency and GHG emissions, we may experience an increase in costs related to truck purchases and maintenance, impairment of equipment productivity, a decrease in the residual value of vehicles, unpredictable fluctuations in fuel prices and an increase in operating expenses. Increased truck traffic may contribute to deteriorating road conditions in some areas where our operations are performed. Our operations, including routing and weight restrictions, could be affected by road construction, road repairs, detours and state and local regulations and ordinances restricting access to certain roads. Proposals to increase federal, staterespirable crystalline silica, or local taxes, including taxes on motor fuels, are also made from time to time, and any such increase would increase our operating costs. Also, state and local regulation of permitted routes and times on specific roadways could adversely affect our operations. We cannot predict whether, or in what form, any legislative or regulatory changes or municipal ordinances applicable to our logistics operations will be enacted and to what extent any such legislation or regulations could increase our costs or otherwise adversely affect our business or operations.

We are subject to environmental and occupational health and safety laws and regulations that may expose us to significant costs and liabilities.

Our operations and the operations of our customers are subject to stringent federal, tribal, regional, state and local laws and regulations governing worker health and safety, protection of the environment, including natural resources, and the management, transportation and disposal of wastes and other materials. We could be exposed to liabilities for cleanup costs, natural resource damages, and other damages under these laws and regulations, with certain of these legal requirements imposing strict liability for such damages and costs, even though our conduct was lawful at the time it occurred or the conduct resulting in such damage and costs were caused by prior operators or other third-parties. 

Environmental laws and regulations in the United States and in foreign countries are subject to change in the future, possibly resulting in more stringent legal requirements. If existing regulatory requirements or enforcement policies change or new regulatory or enforcement initiatives are developed and implemented in the future, we or our oil and

natural gas exploration and production customers may be required to make significant, unanticipated capital and operating expenditures. Examples of recent environmental regulations include the following:

Compliance with these regulations or other laws, regulations and regulatory initiatives, or any other new environmental and occupational health and safety legal requirements could, among other things, require us or our customers to install new or modified emission controls on equipment or processes, incur longer permitting timelines, and incur significantly increased capital or operating expenditures, which costs may be significant. Additionally, one or more of these developments could reduce demand for our products and services. Moreover, any failure by us to comply with applicable environmental laws and regulations may result in governmental authorities taking actions against our business that could adversely impact our operations and financial condition. See “Business” – “Environmental and Occupational Health and Safety Regulation” under Part I, Item 1 of this Form 10 K for further discussion on environmental matters.

An accidental release of materials into the environment, such as from our mobile chemical management systems, may cause us to incur significant costs and liabilities.

Our business activities present risks of incurring significant environmental costs and liabilities, including costs and liabilities resulting from our management, transportation and disposal of regulated materials, such as oilfield and other wastes, because of air emissions and wastewater discharges related to our operations, and due to historical oilfield industry operations and waste disposal practices. In addition, private parties, including the owners of properties upon which we conduct operations and facilities where our wastes are taken for reclamation or disposal, also may have the right to pursue legal actions to enforce compliance as well as to seek damages for non-compliance with environmental laws and regulations or for personal injury or property or natural resource damages. We could incur significant costs and liabilities in the clean-up of our, our customers’ or third-party sites. Some environmental laws and regulations may impose strict liability, which means that in some situations we could be exposed to liability as a result of our conduct that was lawful at the time it occurred or the conduct of, or conditions caused by, prior operators or other third parties. Remedial costs and other damages arising as a result of environmental laws and costs associated with changes in environmental laws and regulations could be substantial and could have a material adverse effect on our liquidity, results of operations and financial condition.

Laws and regulations protecting the environment generally have become more stringent in recent years and are expected to continue to do so, which could lead to material increases in costs for future environmental compliance and remediation. Changes in existing laws or regulations, or the adoption of new laws or regulations, could delay or curtail exploratory or developmental drilling for oil and natural gas and could have a corresponding adverse effect on us by reducing the demand for our products and services. We may not be able to recover some or any of our costs of compliance with these laws and regulations from insurance. We may not be able to recover some or any of these costs from insurance. Additionally, we may not be able to recover some or any of these costs from sources of contractual indemnity or insurance, as pollution and similar environmental risks generally are not insurable or fully insurable, either because such insurance is not available or because of the high premium costs and deductibles associated with obtaining such insurance.

Silica-related legislation, health issues and litigation could have a material adverse effect on our business, reputation or results of operations.

We are subject to laws and regulations relating to human exposure to crystalline silica. For example, in 2016, OSHA published a final rule that establishedhas implemented rules establishing a more stringent permissible exposure limit for exposure to respirable crystalline silica and provided other provisions to protect employees, such as requirements for exposure assessments, methods for controlling exposure, respiratory protection, medical surveillance, hazard communication, and recording. The 2016 rule further requiresemployees. These rules require compliance with engineering control obligations to limit exposures to respirable crystalline silica in connection with hydraulic fracturing activities by June 2021. If we are unable to satisfy these obligations, or are not able to do so in a manner that is cost effective or attractive to our customers, our business operations may be adversely affected or availability or demand for our products could be significantly affected. Federal and state regulatory authorities, including OSHA, and analogous state agencies may continue to propose changes in their regulations regarding workplace exposure to crystalline silica, such as permissible exposure limits and required controls and personal protective equipment, and we can provide no assurance that we will be able to comply with any future laws and regulations relating to exposure to crystalline silica that are adopted, or that the costs of complying with such future laws and regulations would not have a material adverse effect on our operating results by requiring us to modify or cease our operations.

In addition, the inhalation of respirable crystalline silica is associated with health risks, including the lung disease silicosis. There is evidence of an association between crystalline silica exposure or silicosis and lung cancer and a possible association with other diseases, including immune system disorders such as scleroderma. These health risks have been, and may continue to be, a significant issue confronting the hydraulic fracturing industry. Concerns over silicosis and other potential adverse health effects, as well as concerns regarding potential liability from the use of hydraulic fracture sand, may have the effect of discouraging our customers' use of hydraulic fracture sand. The actual or perceived health risks of handling hydraulic fracture sand could materially and adversely affect hydraulic fracturing service providers, including us, through reduced use of hydraulic fracture sand, the threat of product liability or the filing of lawsuits naming us as a defendant, increased scrutiny by federal, state and local regulatory authorities of us and our customers or reduced financing sources available to the hydraulic fracturing industry. See Part I, Item 1. “Business – Environmental and Occupational Health and Safety Regulations” for more discussion on occupational health and safety matters.

Changes in the transportation industry, including fluctuations in transportation costs, changes in the way in which proppant or chemicals are transported to the well site or the availability or reliability of transportation to supply our proppant or chemical management systems and transloading services, could impair the ability of our customers to take delivery of proppant or chemicals or make our products and services less attractive and thereby adversely impact our business.

The transportation industry is subject to possible legislative and regulatory changes that may affect the economics of the industry by requiring changes in operating practices or by changing the demand for common or contract carrier services or the cost of providing truckload services. Disruption of transportation services due to factors outside of our

significantly exceed the actual benefits, if any, Solaris Inc. realizes in respect of the tax attributes subject to the Tax Receivable Agreement."

Our amended and restated certificate of incorporation designates the Court of Chancery of the State of Delaware as the sole and exclusive forum for certain types of actions and proceedings that may be initiated by our stockholders, which could limit our stockholders' ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or agents.

Our amended and restated certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will, to the fullest extent permitted by applicable law, be the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers, employees or agents to us or our stockholders, (iii) any action asserting a claim arising pursuant to any provision of the Delaware General Corporation Law (the "DGCL"), our amended and restated certificate of incorporation or our bylaws, or (iv) any action asserting a claim against us that is governed by the internal affairs doctrine, in each such case subject to such Court of Chancery having personal jurisdiction over the indispensable parties named as defendants therein. Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange Act or the rules and regulations promulgated thereunder. As a result, the exclusive forum provision will not apply to actions arising under the Exchange Act or the rules and regulations promulgated thereunder. However, Section 22 of the Securities Act provides for concurrent federal and state court jurisdiction over actions under the Securities Act and the rules and regulations promulgated thereunder, subject to a limited exception for certain “covered class actions” as defined in Section 16 of the Securities Act and interpreted by the courts. Accordingly, we believe that the exclusive forum provision would apply to actions arising under the Securities Act or the rules and regulations promulgated thereunder, except to the extent a particular action fell within the exception for covered class actions or the exception in the certificate of incorporation described above otherwise applied to such action, which could occur if, for example, the action also involved claims under the Exchange Act. Stockholders will not be deemed, by operation of Article 14 of the certificate of incorporation alone, to have waived claims arising under the federal securities laws and the rules and regulations promulgated thereunder.

Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of, and consented to, the provisions of our amended and restated certificate of incorporation described in the preceding sentence. This choice of forum provision may limit a stockholder's ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers, employees or agents, which may discourage such lawsuits against us and such persons. Alternatively, if a court were to find these provisions of our amended and restated certificate of incorporation inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could adversely affect our business, financial condition or results of operations.

Holders of our Class A common stock may not receive dividends on our Class A common stock.

We declared our first dividend to Class A stockholders in the fourth quarter of 2018 and have continued to declare dividends on a quarterly basis. Holders of our Class A common stock are entitled to receive only such dividends as our board of directors may declare out of funds legally available for such payments. We are incorporated in Delaware and are governed by the DGCL. The DGCL allows a corporation to pay dividends only out of a surplus, as determined under Delaware law or, if there is no surplus, out of net profits for the fiscal year in which the dividend was declared and for the preceding fiscal year. Under the DGCL, however, we cannot pay dividends out of net profits if, after we pay the dividend, our capital would be less than the capital represented by the outstanding stock of all classes having a preference upon the distribution of assets. While management and our board of directors remain committed to evaluating additional ways of creating shareholder value, any determination to pay dividends and other distributions in cash, stock or property by us in the future will be at the discretion of our board of directors and will be dependent on then-existing conditions, including business conditions, our financial condition, results of operations, liquidity, capital requirements, contractual restrictions including restrictive covenants contained in debt agreements and other factors. While we have declared and paid a quarterly cash dividend on our Class A common stock as described under Part II, Item 5. “Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities” of this Annual Report, we are not required to declare future cash dividends on our Class A common stock.

Future sales of our Class A common stock in the public market, or the perception that such sales may occur, could reduce our stock price, and any additional capital raised by us through the sale of equity or convertible securities may dilute your ownership in us.

We may sell additional shares of our Class A common stock in subsequent offerings. In addition, subject to certain limitations and exceptions, the Original Investors may redeem their Solaris LLC Units (together with a corresponding number of shares of Class B common stock) for shares of Class A common stock (on a one-for-one basis, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions) and then sell those shares of Class A common stock.

We previously filed a registration statement with the SEC on Form S-8 providing for the registration of 5,629,888 shares of our Class A common stock issued or reserved for issuance under our long-term incentive plan. Subject to the satisfaction of vesting conditions, shares registered under the registration statement on Form S-8 may be made available for resale immediately in the public market without restriction.

We cannot predict the size of future issuances of our Class A common stock or securities convertible into Class A common stock or the effect, if any, that future issuances and sales of shares of our Class A common stock will have on the market price of our Class A common stock. Sales of substantial amounts of our Class A common stock (including shares issued in connection with an acquisition), or the perception that such sales could occur, may adversely affect prevailing market prices of our Class A common stock.

Solaris Inc. will be required to make payments under the Tax Receivable Agreement for certain tax benefits that it may claim, and the amounts of such payments could be significant.

In connection with the closing of the IPO, Solaris Inc. entered into a Tax Receivable Agreement with the TRA Holders (as defined herein). This agreement generally provides for the payment by Solaris Inc. to each TRA Holder of 85% of the net cash savings, if any, in United States federal, state and local income tax and franchise tax that Solaris Inc. actually realizes (computed using simplifying assumptions to address the impact of state and local taxes) or is deemed to realize in certain circumstances in periods after the IPOinitial public offering as a result of certain increases in tax basis and certain benefitsbenefit attributable to imputed interest. Solaris Inc. will retain the benefit of the remaining 15% of these cash savings. For additional information, see “Payables Related to the Tax Receivable Agreement” inNote 10. “Income Taxes” and Note. 13 “Related Party Transactions” under Part II, Item 8. “Financial Statements and Supplementary

regarding the Tax Receivable Agreement, see Note 10. “Income Taxes” under Part II, Item 8. “Financial Statements and Supplementary Data.”

In certain cases, payments under the Tax Receivable Agreement may be accelerated and/or significantly exceed the actual benefits, if any, Solaris Inc. realizes in respect of the tax attributes subject to the Tax Receivable Agreement.

If we experience a change of control (as defined underin the Tax Receivable Agreement,Agreement), which includes certain mergers, asset sales and other forms of business combinations)combinations, or the Tax Receivable Agreement terminates early, (at Solaris Inc.’s election or as a result of its breach), we would be required to make a substantial, immediate lump-sum payment. This payment would equal the present value of hypothetical future payments that could be required to be paid under the Tax Receivable Agreement (determined by applying a discount rate of one-yearone year London Interbank Offered Rate ("LIBOR"(“LIBOR”) plus 100 basis points). The calculation of hypothetical future payments will be based upon certain assumptions and deemed events set forth in the Tax Receivable Agreement, including that (i) Solaris Inc. has sufficient taxable income to fully utilize the tax benefits covered by the Tax Receivable Agreement (including having sufficient taxable income to currently utilize any accumulated net operating loss carryforwards) and (ii) any Solaris LLC Units (other than those held by Solaris Inc.) outstanding on the termination date are deemed to be redeemed on the termination date. Any early termination payment may be made significantly in advance of, and may materially exceed, the actual realization, if any, of the future tax benefits to which the termination payment relates.

If we experience a change of control, (as defined under the Tax Receivable Agreement) or the Tax Receivable Agreement otherwise terminates early, Solaris Inc.’s obligations under the Tax Receivable Agreementsuch potential termination payment could have a substantial negative impact on Solaris Inc.’s liquidity and could have the effect of delaying, deferring or preventing certain mergers, asset sales or other forms of business combinations or changes of control.

For example, if the Tax Receivable Agreement were terminated immediately after the filing of this Annual Report the estimated termination payments would, in the aggregate, be approximately $101.7$87.6 million (calculated using a discount rate equal to one-yearone year LIBOR plus 100 basis points, applied against an undiscounted liability of $114.6$93.1 million, based upon the last reported closing sale price of our Class A common stock on December 31, 2019)2020). The foregoing number is merely an estimate and the actual payment could differ materially. There can be no assurance that we will be able to finance our obligations under the Tax Receivable Agreement.

Please read Note 10. “Income Taxes” under Part II, Item 8. “Financial Statements and Supplementary Data.”Data” for additional information.

In the event that Solaris Inc.’s payment obligations under the Tax Receivable Agreement are accelerated upon certain mergers, other forms of business combinations or other changes of control, the consideration payable to holders of our Class A common stock could be substantially reduced.

If we experience a change of control (as defined under the Tax Receivable Agreement, which includes certain mergers, asset sales and other forms of business combinations) Solaris Inc. would be obligated to make a substantial, immediate lump-sum payment, and such payment may be significantly in advance of, and may materially exceed, the actual realization, if any, of the future tax benefits to which the payment relates. As a result of this payment obligation,Additionally, holders of our Class A common stock could receive substantially less consideration in connection with a change of control transaction than they would receive in the absence of such obligation. Further, Solaris Inc.’s payment obligations under the Tax Receivable Agreement will not be conditioned upon the TRA Holders having a continued

tax benefits that have given rise to payments under the Tax Receivable Agreement are subsequently disallowed, except that excess payments made to any TRA Holder will be netted against payments that would otherwise be made to such TRA Holder, if any, after our determination of such excess.disallowed. As a result, in such circumstances, we could make payments that are greater than our actual cash tax savings, if any, and may not be able to recoup those payments, which could adversely affect our liquidity.

WeThe requirements of being a public company, including compliance with the reporting requirements of the Exchange Act, and the requirements of the Sarbanes-Oxley Act, may issue preferred stock whose terms could adversely affectstrain our resources, increase our costs and distract management, and we may be unable to comply with these requirements in a timely or cost-effective manner.

As a public company, we need to comply with laws, regulations and requirements, certain corporate governance provisions of the voting power or valueSarbanes-Oxley Act and related regulations of our Class A common stock.

Our amendedthe SEC and restated certificatethe requirements of incorporation authorizes us to issue, without the approvalNew York Stock Exchange (the “NYSE”). Complying with these statutes, regulations and requirements occupies a significant amount of our stockholders, one or more classes or seriestime of preferred stock having such designations, preferences, limitations and relative rights, including preferences over our Class A common stock respecting dividends and distributions, as our board of directors may determine. The termsand management and significantly increases our costs and expenses.

Furthermore, while we must comply with Section 404 of one or more classes or series of preferred stock could adversely impact the voting power or valueSarbanes-Oxley Act, we are not required to have our independent registered public accounting firm attest to the effectiveness of our Class A common stock. For example,internal controls until our first annual report subsequent to our ceasing to be an "emerging growth company" within the meaning of Section 2(a)(19) of the Securities Act. Accordingly, we might grant holders of preferred stockmay not be required to have our independent registered public accounting firm attest to the right to elect some numbereffectiveness of our internal controls until as late as our annual report for the fiscal year ending December 31, 2022. Once it is required to do so, our independent registered public accounting firm may issue a report that is adverse in the event it is not satisfied with the level at which our controls are documented, designed, operated or reviewed. Compliance with these requirements may strain our resources, increase our costs and distract management, and we may be unable to comply with these requirements in a timely or cost-effective manner.

In addition, being a public company subject to these rules and regulations may make it more difficult and more expensive for us to obtain director and officer liability insurance and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. As a result, it may be more difficult for us to attract and retain qualified individuals to serve on our board of directors in all events or on the happening of specified events or the right to veto specified transactions. Similarly, the repurchase or redemption rights or liquidation preferences we might assign to holders of preferred stock could affect the residual value of the Class A common stock.as executive officers.

For as long as we are an emerging growth company, we will not be required to comply with certain reporting requirements, including those relating to internal controls, accounting standards and disclosure about our executive compensation, that apply to other public companies.

WeUnder Section 404(a) of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”) our management is required to assess and report annually on the effectiveness of our internal control over financial reporting and identify any material weaknesses in our internal control over financial reporting. Once we are classified asno longer an "emergingemerging growth company" undercompany, Section 404(b) of the Jumpstart Our Business StartupsSarbanes-Oxley Act (the “JOBS Act”). Forwill require our independent registered public accounting firm to issue an annual report that addresses the effectiveness of our internal control over financial reporting. If material weaknesses are discovered in the future, the Company’s financial statements could contain additional errors which, in turn, could lead to errors in our financial reports and/or delays in our financial reporting, which could require us to further restate our operating results. As a result, investors may lose confidence in our operating results, the price of our Class A common stock could decline and we may be subject to litigation or regulatory enforcement actions, including delisting from the NYSE.

Additionally, for as long as we are an emerging growth company, which may be up to five full fiscal years, unlike other public companies, we will not be required to, among other things: (i) provide an auditor's attestation report on management's assessment of the effectiveness of our system of internal control over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act of 2002; (ii) comply with any new requirements if adopted by the Public Company Accounting Oversight Board (United States) (“PCAOB”) requiring mandatory audit firm rotation or a supplement to the auditor's report in which the auditor would be required to provide additional information about the audit and the financial statements of the issuer; (iii)(ii) provide certain disclosures regarding executive compensation required of larger public companies; or (iv)(iii) hold nonbinding advisory votes on executive compensation. The Company has elected not to use the extended transition period for complying with any new or revised financial accounting standards. We may remain an emerging growth company until December 31, 2022, although we will lose that status sooner if we have more than $1.07 billion

Item 2.        Properties

Our principal properties are described in Item 1. “Business” under the caption “—Kingfisher Facility.Our Properties.”

Item 3.       Legal Proceedings

Disclosure concerning legal proceedings is incorporated by reference to “Part II. Item 8. “Financial Statements and Supplementary Data—Note 3. Legal Proceedings” in this Annual Report.

Due to the nature of our business, we may become, from time to time, involved in routine litigation or subject to disputes or claims related to our business activities. In the opinion of our management, there are no pending litigation, disputes or claims against us which, if decided adversely, will have a material adverse effect on our financial condition, cash flows or results of operations.

Item 4.      Mine Safety Disclosures

Not applicable.

Part II

Item 5.      Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

Shares of our Class A common stock trade on the NYSE under the symbol “SOI.”

As of February 14, 2020,18, 2021, we had approximately 96 holders of record of our Class A common stock. This number excludes owners for whom Class A common stock may be held in "street" name.

There is no market for our Class B common stock. As of February 14, 2020,18, 2021, we had 1916 holders of record of our Class B common stock.

Dividend Policy

The Company payspaid quarterly cash dividends on itsof $0.105 per share of Class A common stock. We currently intend to continue paying the quarterly dividend while retaining the balance of future earnings, if any, to finance the growth of our business. However, our future dividend policy is within the discretion of our board of directors and will depend upon then-existing conditions, including our results of operations, financial condition, capital requirements, investment opportunities, statutory restrictions on our ability to pay dividends and other factors our board of directors may deem relevant. In addition, our 2019 Credit Agreement contains certain restrictions on our ability to pay cash dividends to holders of our Class A common stock.

Stock Performance Graph

The graph below compares the cumulative total shareholder return on our common stock with the cumulative total return on the Standard & Poor’s 500 Stock Index and the Oilfield Service Index since May 12, 2017, the first day our Class A common stock traded on the NYSE.