UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM20-F

for the fiscal year ended December 31, 20172020

Commission File Number0-99

PETRÓLEOS MEXICANOS

(Exact name of registrant as specified in its charter)

Avenida Marina Nacional No. 329

Colonia Verónica Anzures

11300 Ciudad de México, México

(Address of principal executive offices)

Jaime José del Río CastilloLucero Angélica Medina González

(5255) 1944 97009126-2940

ri@pemex.com

Avenida Marina Nacional No. 329

Torre Ejecutiva, Piso 38 Colonia Verónica Anzures

11300 Ciudad de México, México

(Name, telephone,e-mail and/or facsimile number

and address of company contact person)

Securities registered or to be registered pursuant to Section 12(b) of the Act.None

Securities registered or to be registered pursuant to Section 12(g) of the Act.None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.

Title of Each Class

Indicate by check mark if the registrant is awell-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes  ☐     No  ☒

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

Yes  ☐    No  ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of RegulationS-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, anon-accelerated filer, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule12b-2 of the Exchange Act. (Check one):

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

☐

†The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.    

Yes  ☐    No  ☒

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

U.S. GAAP☐                IFRS as issued by the IASB  ☒                Other  ☐

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.

Item 17☐    Item 18☐

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Exchange Act).

Yes☐    No☒

TABLE OF CONTENTS

EXPLANATORY NOTE

In the process of the preparation of the consolidated financial statements for the year ended December 31, 2020, we identified errors in certain costs and expenses used for the determination of the value in use of some cash generating units of Pemex Exploration and Production for the assessment of the impairment of long-term assets as of December 31, 2019. This resulted in a different value in use in some cash generating units and thus, an increase in the value of wells, pipelines, plants and platforms as of December 31, 2019 in the amount of Ps. 65.8 billion and a favorable impact on our results of operation for 2019, for the same amount. Accordingly, we adjusted our consolidated financial statements for the year ended December 31, 2019 to correct this error. See Note 4-B to our consolidated financial statements included herein.

Petróleos Mexicanos and its seventhree subsidiary entities, which we refer to as the subsidiary entities,Pemex Exploración y Producción (Pemex Exploration and Production),Pemex Transformación Industrial (Pemex Industrial Transformation) and Pemex Logística (Pemex Logistics), comprise the state oil and gas company of the United Mexican States, which we refer to as Mexico. Petróleos Mexicanos is a productive state-owned company of the Federal Government of Mexico, which we refer to as the Mexican Government, and each of the subsidiary entities is a productive state-owned subsidiary of Mexico. Each of Petróleos Mexicanos and the subsidiary entities is a legal entity empowered to own property and carry on business in its own name. In addition, a number of subsidiary companies that are defined in Note 3-a and listed in Note 5 to our consolidated financial statements incorporated in Item 18, which we refer to as our subsidiary companies, are incorporated into the consolidated financial statements; these subsidiary companies are also identified with their corresponding ownership percentages in “––Consolidated Structure of PEMEX” on page 8. Petróleos Mexicanos, the subsidiary entities and the subsidiary companies are collectively referred to as “PEMEX” or “we.” See “Item 4—Information on the Company—History and Development—Corporate Structure” for more details.

References herein to “U.S. $,” “$,” “U.S. dollars” or “dollars” are to United States dollars. References herein to “pesos” or “Ps.” are to the legal currency of Mexico. References herein to “euros” or “€” are to the legal currency of the European Economic and Monetary Union. References herein to “pounds sterling” or “£” are to the legal currency of the United Kingdom. References herein to “Swiss francs” are to the legal currency of the Swiss Confederation. References herein to “Japanese yen” or “¥” are to the legal currency of Japan. References herein to “Australian dollars” are to the legal currency of Australia. The term “billion” as used herein means one thousand million.

Our consolidated financial statements included in this annual report were prepared in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. We refer in this report to “International Financial Reporting Standards as issued by the International Accounting Standards Board” as IFRS. In addition, these financial statements were audited in accordance with the International Standards on Auditing, as required by the Ley del Mercado de Valores (Securities Market Law) and the Disposiciones de carácter general aplicables a las emisoras de valores y a otros participantes del mercado de valores (General Provisions applicable to issuers of securities and other participants in the securities market) in each case, of Mexico, for purposes of filing with the ComisiónNacional Bancaria y de Valores (National Banking and Securities Commission, or the CNBV) and the Bolsa Mexicana de Valores, S.A.B. de C.V. (Mexican Stock Exchange), and in accordance with the standards of the Public Company Accounting Oversight Board (United States), or PCAOB, for purposes of filings with the U.S. Securities and Exchange Commission, or the SEC.

The regulations of the SEC do not require foreign private issuers that prepare their financial statements on the basis of IFRS to reconcile such financial statements to United States Generally Accepted Accounting Principles, which we refer to as U.S. GAAP. Accordingly, while we have in the past reconciled our consolidated financial statements prepared in accordance with Normas de Información Financiera Mexicanas (Mexican Financial Reporting Standards) to U.S. GAAP, those reconciliations are no longer presented in our filings with the SEC. We do, however, continue to provide the disclosure required under the U.S. Financial Accounting Standards Board Accounting Standards Codification (ASC) Topic 932 “Extractive Activities—Oil and Gas” (which we refer to as ASC Topic 932), as this is required regardless of the basis of accounting on which we prepare our financial statements.

We maintain our consolidated financial statements and accounting records in pesos. Unless otherwise indicated, we have translated all peso amounts to U.S. dollars in this Form 20-F, including all convenience translations of our consolidated financial statements included herein, at an exchange rate of Ps. 19.9487 = U.S. $1.00, which is the exchange rate that the Secretaría de Hacienda y Crédito Público (Ministry of Finance and Public Credit) instructed us to use on December 31, 2020. You should not construe these translations from pesos into dollars as actually representing such U.S. dollar amounts or meaning that you could convert such amounts into U.S. dollars at the rates indicated. Mexico has a free market for foreign exchange, and the Mexican Government allows the peso to float freely against the U.S. dollar. There can be no assurance that the Mexican Government will maintain its current policies with regard to the peso or that the peso will not depreciate or appreciate significantly in the future. Due to the volatility of the peso/U.S. dollar exchange rate, the exchange rate on any date subsequent to the date hereof could be materially different from the rate indicated above.

PRESENTATION OF INFORMATION CONCERNING RESERVES

The proved hydrocarbon reserves included in this report for the year ended December 31, 2020 are those that we have the right to extract and sell based on assignments granted to us by the Mexican Government.

The estimates of our proved reserves of crude oil and natural gas for the five years ended December 31, 2020 included in this report have been calculated according to the technical definitions required by the SEC. DeGolyer and MacNaughton, Netherland, Sewell International, S. de R.L. de C.V. (which we refer to as Netherland Sewell), GLJ Petroleum Consultants Ltd. (which we refer to as GLJ) and Sproule International Limited and Sproule México, S.A. de C.V. (which we refer to as Sproule) conducted reserves audits of our estimates of our proved hydrocarbon reserves as of December 31, 2020 or January 1, 2021, as applicable. All reserves estimates involve some degree of uncertainty. For a description of the risks relating to reserves and reserves estimates, see “Item 3—Key Information—Risk Factors—Risk Factors Related to our Relationship with the Mexican Government— Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions,” “—We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our potential to make capital investments” and “—The Mexican nation, not us, owns the hydrocarbon reserves located in Mexico and our right to continue to extract these reserves is subject to the approval of the Secretaría de Energía (Ministry of Energy or SENER).”

FORWARD-LOOKING STATEMENTS

This Form 20-F contains words, such as “believe,” “expect,” “anticipate” and similar expressions that identify forward-looking statements, which reflect our views about future events and financial performance. We have made forward-looking statements that address, among other things, our:

Actual results could differ materially from those projected in such forward-looking statements as a result of various factors that may be beyond our control. These factors include, but are not limited to:

Accordingly, you should not place undue reliance on these forward-looking statements. In any event, these statements speak only as of their dates, and we undertake no obligation to update or revise any of them, whether as a result of new information, future events or otherwise.

For a discussion of important factors that could cause actual results to differ materially from those contained in any forward-looking statement, see “Item 3—Key Information—Risk Factors.”

CONSOLIDATED STRUCTURE OF PEMEX

The following chart presents the consolidated structure of PEMEX as of December 31, 2020.

PART I

Not applicable.

Not applicable.

A.      Selected Financial Data

Not applicable.

B.      Capitalization and Indebtedness

Not applicable.

C.      Reasons for the Offer and Use of Proceeds

Not applicable.

D.     Risk Factors

Risk Factors Related to Our Operations

We have a substantial amount of indebtedness and other liabilities and are exposed to liquidity constraints, which could make it difficult for us to obtain financing on favorable terms and could adversely affect our financial condition, results of operations and ability to repay our debt.

We have a substantial amount of debt, which we have incurred primarily to finance the capital expenditures needed to carry out our capital investment projects and to fund our operating expenses. Due to our heavy tax burden, our cash flow from operations in recent years has not been sufficient to fund our capital expenditures and other expenses and, accordingly, our debt has significantly increased and our working capital has deteriorated. In recent years, our level of indebtedness relative to our oil reserves has increased substantially. Relatively low oil prices since 2014 and the further decline in 2020, as well as declining production, have also had a negative impact on our ability to generate positive cash flows, which, together with our continued heavy tax burden and increased competition from the private sector, has further strained our ability to fund our capital expenditures and other expenses from cash flow from operations. Therefore, in order to develop our hydrocarbon reserves, service our indebtedness and amortize scheduled debt maturities, we will need to obtain funds from a broad range of sources, in addition to successfully implementing efficiency and cost-cutting initiatives. There can be no assurance that we will continue to have access to capital on favorable terms or any terms at all.

As of December 31, 2020, our total indebtedness, including accrued interest, was Ps. 2,258.7 billion (U.S. $113.2 billion), in nominal terms, which represented a 13.9% increase in peso terms compared to our total indebtedness, including accrued interest, of Ps. 1,983.2 billion (U.S. $105.2 billion) as of December 31, 2019. As of December 31, 2020, 28.3% of our existing debt, or Ps. 640.2 billion (U.S. $32.1 billion), including accrued interest, is scheduled to mature in the next three years. Our working capital deteriorated from a negative working capital of Ps. 209.2 billion (U.S. $11.1 billion) as of December 31, 2019 to a negative working capital of Ps. 442.6 billion (U.S. $22.2 billion) as of December 31, 2020. Our level of debt may increase further in the short or medium term as a result of new financing activities or future depreciation of the peso as compared to the U.S. dollar, and may have an adverse effect on our financial condition, results of operations and liquidity position. To service our debt, we have relied and may continue to rely on a combination of cash flows from our operations, drawdowns under our available credit facilities and incurrence of additional indebtedness (including refinancing of existing indebtedness). See “Item 5—Operating and Financial Review and Prospects—Liquidity and Capital Resources—Overview.”

If we were unable to obtain financing, this could hamper our ability to invest in projects and meet our principal and interest payment obligations with our creditors. As a result, we may be exposed to liquidity constraints and may not be able to pay our suppliers, service our debt or make the capital expenditures required to maintain our current production levels and to maintain, and increase, the proved hydrocarbon reserves assigned to us by the Mexican Government, which may adversely affect our financial condition and results of operations. See “—Risk Factors Related to our Relationship with the Mexican Government—We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our potential to make capital investments” below.

If such constraints occur at a time when our cash flow from operations is less than the resources necessary to meet our debt service obligations, in order to provide additional liquidity to our operations, we could be forced to further reduce our planned capital expenditures and implement further austerity measures. A reduction in our capital expenditure program could adversely affect our financial condition and results of operations. Additionally, such measures may not be sufficient to permit us to meet our obligations.

Our financial statements have been prepared on the assumption that we will continue as a going concern.

Our consolidated financial statements have been prepared under the assumption that we will continue as a going concern. However, there is material uncertainty that raises significant doubt about our ability to continue operating as a going concern. Our consolidated financial statements do not include any adjustments that might result from the outcome of that uncertainty. If the actions we are taking to improve our financial condition, which are described in detail under “Item 5 — Operating and Financial Review and Prospects —Liquidity and Capital Resources — Overview,” are not successful, we may not be able to continue operating as a going concern.

Downgrades in our credit ratings could negatively impact our access to the financial markets and cost of financing.

We rely on access to the financial markets to fund our operations and finance the capital expenditures needed to carry out our capital investment projects. Accordingly, credit ratings are important to our business and financial condition, as credit ratings affect the cost and other terms upon which we are able to obtain funding. In light of our high leverage, the downturn in the oil and gas industry, as well as the ongoing economic and public health crises posed by the COVID-19 pandemic, certain ratings agencies have expressed concern that we lack flexibility to navigate the downturn and to finance our capital investment needs in the face of low cash flow generation and adverse financing conditions. Partially as a result of these external pressures, various rating agencies have downgraded our ratings during March and April of 2020. See “Item 5—Liquidity and Capital Resources—Overview” below for some of the concerns expressed by certain ratings agencies.

Ratings address our creditworthiness and the likelihood of timely payment of our long-term debt securities. Ratings are not a recommendation to purchase, hold or sell securities and may be changed, suspended or withdrawn at any time. Our current ratings and the rating outlooks depend, in part, on economic conditions and other factors that affect credit risk and are outside our control, as well as assessments of the creditworthiness of Mexico. Certain ratings agencies have recently downgraded Mexico’s credit ratings and their assessment of Mexico’s creditworthiness has and may further affect our credit ratings.

We currently have a “split rating,” with a non-investment grade credit rating from two rating agencies but investment grade credit ratings from other rating agencies. For information regarding our current credit ratings, please see “Item 5—Liquidity and Capital Resources—Overview.” While these downgrades do not constitute a default or event of default under our debt instruments, they have increased our cost of financing. Any further lowering of our credit ratings may have material adverse consequences on our ability to access the financial markets and the terms on which we may obtain financing, including our cost of financing. In turn, this could significantly harm our ability to meet our existing obligations, financial condition and results of operations. In addition, in connection with the entry into new financings or amendments to existing financing arrangements, our financial and operational flexibility may be reduced as a result of more restrictive covenants, requirements for security and other terms that may be imposed on split rated entities. Our split rating and any further credit rating downgrades could also negatively impact the prices of our debt securities and reduce our potential pool of investors and funding sources, among other consequences. There can be no assurance that we will be able to maintain or improve our current credit ratings or outlook.

Crude oil, natural gas and petroleum products prices are volatile and low crude oil and natural gas prices adversely affect our income and cash flows and the amount of hydrocarbon reserves that we have the right to extract and sell.

International crude oil, natural gas and petroleum products prices are subject to global supply and demand and fluctuate due to many factors beyond our control. These factors include competition within the oil and natural gas industry, the prices and availability of alternative sources of energy, international economic trends, exchange rate fluctuations, expectations of inflation, domestic and foreign laws and government regulations, political and other events in major oil and natural gas producing and consuming nations and actions taken by Organization of the Petroleum Exporting Countries (OPEC) members and other oil exporting countries, trading activity in oil and natural gas and transactions in derivative financial instruments (which we refer to as DFIs) related to oil and gas.

When international crude oil, petroleum product and/or natural gas prices are low, we generally earn less revenue and, therefore, generate lower cash flows and earn less income before taxes and duties because our costs remain roughly constant. Conversely, when crude oil, petroleum product and natural gas prices are high, we earn more revenue and our income before taxes and duties increases. Crude oil export prices, which had generally traded above U.S. $75.00 per barrel since October 2009 and traded above U.S. $100.00 per barrel as of July 30, 2014, began to fall in August 2014. The weighted average Mexican crude oil export price fell further in subsequent years, reaching U.S. $18.90 per barrel on January 20, 2016. In subsequent years, while prices have remained significantly below 2014 levels, average crude oil export prices stabilized, with the Mexican crude oil export price averaging U.S. $62.29 per barrel in 2018 and U.S. $55.53 per barrel in 2019.

During 2020, the weighted average Mexican crude oil price was U.S. $35.82 per barrel, a decrease of U.S. $19.71 per barrel as compared to the 2019 weighted average Mexican crude oil export price. While prices have begun to stabilize, they still remain significantly lower than 2014 levels. Any future decline in international crude oil and natural gas prices will have a similar negative impact on our results of operations and financial condition. These fluctuations may also affect estimates of the amount of Mexico’s hydrocarbon reserves that we have the right to extract and sell, which could affect our future production levels. See “—Risk Factors Related to our Relationship with the Mexican Government—Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions” and “Item 11—Quantitative and Qualitative Disclosures About Market Risk—Changes in Exposure to Main Risks—Market Risk—Hydrocarbon Price Risk” below.

However, beginning in early March of 2020, the market experienced a precipitous decline in oil prices. This decline occurred in response to a substantial decline in demand for oil due to the economic impacts of the COVID-19 pandemic, which caused an oversupply and in turn insufficient global storage capacity. The Mexican crude oil export price averaged U.S. $40.91 per barrel for the three month period ended March 31, 2020 and reached an unprecedented low of negative U.S. $7.33 per barrel on April 28, 2020. Prices continue to display significant volatility both in reaction to the COVID-19 pandemic and actions taken by other oil producing countries.

On April 12, 2020, OPEC and other non-OPEC oil exporting countries, including, among others, Mexico and Russia, reached an agreement to reduce world crude oil supply. Pursuant to this agreement, these countries, which are known as OPEC+, agreed to reduce their overall crude oil production by 9.7 million barrels per day from May 1, 2020 through June 30, 2020, by 7.7 million barrels per day from July 1, 2020 through December 31, 2020 and by 5.8 million barrels per day from January 1, 2021 through April 30, 2022. In particular, Mexico agreed to reduce its crude oil production by 100,000 barrels per day for a period of two months beginning on May 1, 2020. During May, June, July, August, September, October and November 2020, we decreased our crude oil production to 1,676.6, 1,654.7, 1,647.3, 1,687.9, 1,697.8, 1,680.2 and 1,688.8 thousand barrels per day, respectively. In December 2020, we increased our crude oil production to 1,711.5 thousand barrels per day. Furthermore, as a result of the reduction in the demand and prices of oil and fuel caused by the COVID-19 pandemic, we revised our production target for 2021 from approximately 2.03 million barrels per day to 1.88 million barrels per day.

Any further or future production cuts or declines in international crude oil and natural gas prices will likely have a negative impact on our results of operations and financial condition. In addition, significant fluctuations may affect estimates of the amount of Mexico’s hydrocarbon reserves that we have the right to extract and sell, which could affect our future production levels. See “—Risk Factors Related to our Relationship with the Mexican Government—Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions” below and “Item 11—Quantitative and Qualitative Disclosures About Market Risk—Changes in Exposure to Main Risks—Market Risk—Hydrocarbon Price Risk.”

The outbreak of COVID-19 has had and may continue to have an adverse effect on our business, results of operations and financial condition.

Since December 2019, a novel strain of coronavirus (referred to as COVID-19) has spread throughout the world. On March 11, 2020, COVID-19 was categorized as a pandemic by the World Health Organization. The COVID-19 pandemic has resulted in numerous deaths and the imposition of local, municipal and national governmental “shelter-in-place” and other quarantine measures, border closures and other travel restrictions, causing unprecedented commercial disruption in a number of jurisdictions, including Mexico. Many countries around the world, including Mexico, are suffering significant economic and social crises as a result of the ongoing COVID-19 pandemic and measures taken to contain or mitigate it, which have had dramatic adverse consequences on demand, operations, supply chains and financial markets, as well as contributed to significant oil price volatility. While the nature and scope of the consequences to date are difficult to evaluate precisely, and their future course is impossible to predict with confidence, these events may continue for a sustained period of time.

The Mexican Government has adopted certain measures intended to help mitigate the spread of COVID-19 in Mexico, including the introduction of a color-coded system that ranges from red to green and clarifies what level of activities are permitted depending on the percentage of local hospitalizations and the trend in positive COVID-19 cases. In the case of a red color, only essential activities are permitted. We cannot predict the range of future policies that may be enacted by the Mexican Government, or any other government, or the impact these policies will have on our business and operations. Our business operation is generally considered a strategic area as defined in Articles 27 and 28 of the Constitución Política de los Estados Unidos Mexicanos (Political Constitution of the United Mexican States or the Mexican Constitution). Certain of our operations have remained active during the pandemic – however, in accordance with our business continuity plan, we have limited our workforce’s access to our facilities, implemented alternating shifts and allowed a portion of our workforce to work remotely. In addition, we have implemented sanitizing measures to disinfect our facilities and the use of thermal cameras and other special equipment to monitor infection risks. Despite these precautions, a significant portion of our workforce has contracted COVID-19 and regrettably some of our employees have died. The COVID-19 pandemic, or any future pandemic or epidemic, has and may further impact the places where we operate or our workforce. In turn, this could significantly disrupt our operations and cause health restrictions to our workforce and, therefore, impact the operation of our facilities, including our platforms, refineries and terminals, among others. These conditions may adversely affect our business, results of operations and financial condition.

In addition to the operational impacts of the COVID-19 pandemic, international oil prices, oil products and natural gas are volatile and strongly influenced by conditions and expectations of world supply and demand. The COVID-19 pandemic has and will likely continue to cause a significant decrease in worldwide oil demand in 2021. The decrease in oil demand has led to significantly lower oil prices and, consequently, has significantly adversely affected our business, results of operations and financial condition. See “—Risk Factors Related to Our Operations—Crude oil, natural gas and petroleum products prices are volatile and low crude oil and natural gas prices adversely affect our income and cash flows and the amount of hydrocarbon reserves that we have the right to extract and sell” above, “Item 5—Overview” for further information about the impact on us of COVID-19 pandemic.

Given that the impact of the COVID-19 pandemic will likely continue for an extended period of time, it could adversely affect our ability to operate our business in the manner and on the timelines previously planned. Further, it has had, and could continue to have accounting consequences, such as decreases in our revenues and the value of our inventories, foreign exchange losses, impairments of fixed assets, and affect our ability to operate effective internal control over financial reporting.

The extent to which COVID-19 or other health pandemics or epidemics may continue to impact Mexico, the Mexican economy and the global economy and, in turn, our business, results of operations and financial condition is highly uncertain and will depend on numerous evolving factors that we cannot predict, including, but not limited to:

We are an integrated oil and gas company and are exposed to production, equipment and transportation risks, criminal acts, blockades to our facilities, cyber-attacks, failure in our information technology system and deliberate acts of terror that could adversely affect our business, results of operations and financial condition.

We are subject to several risks that are common among oil and gas companies. These risks include production risks (fluctuations in production due to operational hazards, natural disasters or weather, accidents, etc.), equipment risks (relating to the adequacy and condition of our facilities and equipment) and transportation risks (relating to the condition and vulnerability of pipelines and other modes of transportation). More specifically, our business is subject to the risks of explosions in pipelines, refineries, plants, drilling wells and other facilities, oil spills, hurricanes in the Gulf of Mexico and other natural or geological disasters and accidents, fires and mechanical failures.

Our operations are also subject to the risk of criminal acts to divert our crude oil, natural gas or refined products from our pipeline network, including the theft, and tampering with the quality, of our products.

In 2020, we discovered 11,022 illegal pipeline taps, as compared to 13,137 in 2019. In 2020, we estimate fuel theft averaged about 4,800 barrels per day. We are also subject to the risk that some of our employees may, or may be perceived to, be participating in the illicit market in fuels. In addition, our facilities are subject to the risk of sabotage, terrorism and blockades. The occurrence of incidents such as these related to the production, processing and transportation of oil and gas products could result in personal injuries, loss of life, environmental damage from the subsequent containment, clean-up and repair expenses, equipment damage and damage to our facilities, which in turn could adversely affect our business, results of operations and financial condition.

Our operations are supported by our information technology systems and therefore, cybersecurity plays a key role in protecting our operations. Cyber-threats and cyber-attacks are becoming increasingly sophisticated, coordinated and costly, and could be targeted at our operations or information systems. Consequently, we have established information security policies, in order to help us prevent, detect and correct vulnerabilities, contain and mitigate threats, reduce the possibilities of attacks and where appropriate, mitigate their impacts. On November 10, 2019, we detected a ransomware cyber-attack that targeted certain computer software applications. The cyber-attack did not affect the operational continuity of our business. Following the cyber-attack and in accordance with our protocols, we implemented remedial measures intended to contain the extent of the attack and preserve the integrity of our proprietary information. Additionally, we made complaints to the competent authority to investigate the causes and nature of the cyber-attack.

Although we have established an information security program, if the integrity of our information technology systems were to be compromised due to another cyber-attack, or due to the negligence or misconduct of our employees, our business operations could be disrupted or even paralyzed and our proprietary information could be lost or stolen. As a result of these risks, we could face, among other things, regulatory action, legal liability, damage to our reputation, a significant reduction in revenues, an increase in costs, a shutdown of operations, or loss of our investments in areas affected by such cyber-attacks, which in turn could have a material adverse effect on our reputation, results of operations and financial condition.

We purchase comprehensive insurance policies covering most of these risks; however, these policies may not cover all liabilities, and insurance may not be available in the market for some of the consequential risks. There can be no assurance that significant incidents will not occur in the future, that insurance will adequately cover the entire scope or extent of our losses or that we will not be held responsible for such incidents. The occurrence of a significant incident or unforeseen liability for us for which we are not fully insured or for which insurance recovery is significantly delayed could have a material adverse effect on our results of operations and financial condition. See “Item 4—Information on the Company—Business Overview—PEMEX Corporate Matters—Insurance.”

A continued decline in our proved hydrocarbon reserves and production could adversely affect our operating results and financial condition.

Some of our existing oil and gas producing fields are mature and, as a result, our reserves and production may decline as reserves are depleted. In years prior to 2019, the replacement rate for our proved hydrocarbon reserves has been insufficient to prevent a decline in our proved reserves. However, during 2020, our total proved reserves increased by 201.9 million barrels of crude oil equivalent, or 2.8%, after accounting for discoveries, extensions, revisions, and delimitations, from 7,182.0 million barrels of crude oil equivalent as of December 31, 2019 to 7,383.9 million barrels of crude oil equivalent as of December 31, 2020. See “Item 4—Information on the Company—Business Overview–– Exploration and Production––Reserves” for more information about the factors leading to this increase. Our reserve replacement ratio, or RRR, in 2020 was 119.7%, a small decrease from our RRR of 120.1% in 2019. However, while in 2019, our crude oil production decreased by 7.6%, in 2020, our crude oil production increased by 0.1%, primarily as a result of the increase in the new offshore fields Cahua, Cheek, Chejekbal, Hok, Mulach, Manik NW, Octli, Tlacame and in the onshore fields Teotleco, Sini, Tokal, Quesqui, Cibix and Ixachi. There can be no assurance however, that we will be able to stop or reverse the decline in our proved reserves and production, which at any moment could have an adverse effect on our business, results of operations and financial condition.

Developments in the oil and gas industry and other factors may result in substantial write-downs of the carrying amount of certain of our assets, which could adversely affect our operating results and financial condition.

We evaluate on an annual basis, or more frequently where the circumstances require, the carrying amount of our assets for possible impairment. Our impairment tests are performed by a comparison of the carrying amount of an individual asset or a cash-generating unit with its recoverable amount. Whenever the recoverable amount of an individual asset or cash-generating unit is less than its carrying amount, an impairment loss is recognized to reduce the carrying amount to the recoverable amount.

Changes in the economic, regulatory, business or political environment in Mexico or other markets where we operate, such as the liberalization of fuel prices or a significant decline in international crude oil and gas prices, among other factors, may result in the recognition of impairment charges in certain of our assets. Due to the decline in oil prices, we have performed impairment tests of our non-financial assets (other than inventories and deferred taxes) at the end of each quarter. As of December 31, 2018 and 2019, we recognized a net reversal of impairment of Ps. (21,419.0) million and an impairment of Ps. 31,283 million, respectively. As of December 31, 2020, we recognized an impairment in the amount of Ps. 36,354 million. See Note 13 to our consolidated financial statements for further information about the impairment of certain of our assets. Future developments in the economic environment, in the oil and gas industry and other factors could result in further substantial impairment charges, adversely affecting our operating results and financial condition.

Increased competition in the energy sector could adversely affect our business and financial performance.

TheMexican Constitution and the Ley de Hidrocarburos (Hydrocarbons Law) allow other oil and gas companies, in addition to us, to carry out certain activities related to the energy sector in Mexico, including exploration and production activities, and the import and sale of gasoline. As a result, we face competition for the right to explore and develop new oil and gas reserves in Mexico. We also face competition in connection with certain refining, transportation and processing activities. Increased competition could make it difficult for us to hire and retain skilled personnel. While we have not yet experienced significant adverse effects from increased competition, there can be no assurances that we will not experience such adverse effects in the future. If we are unable to compete successfully with other oil and gas companies in the energy sector in Mexico, our results of operations and financial condition may be adversely affected.

We participate in strategic alliances, joint ventures and other joint arrangements. These arrangements may not perform as expected, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

We have entered into and may in the future enter into strategic alliances, joint ventures and other joint arrangements. These arrangements are intended to reduce risks in exploration and production, refining, transportation and processing activities. Our partners in such arrangements may, as a result of financial or other difficulties, be unable or unwilling to fulfill their financial or other obligations under our agreements, threatening the viability of the relevant project. In addition, our partners may have inconsistent or opposing economic or business interests and take action contrary to our policies or objectives, which could be to our overall detriment. If our strategic alliances, joint ventures and other joint arrangements do not perform as expected, our reputation may be harmed and our business, financial condition and results of operations could be adversely affected.

We are subject to Mexican and international anti-corruption, anti-bribery and anti-money laundering laws. Our failure to comply with these laws could result in penalties, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

We are subject to Mexican and international anti-corruption, anti-bribery and anti-money laundering laws. See “Item 4—Information on the Company—General Regulatory Framework.” Although we maintain policies and processes intended to comply with these laws, including the review of our internal control over financial reporting, we are subject to the risk that our management, employees, contractors or any person doing business with us may engage in fraudulent activity, corruption or bribery, circumvent or override our internal controls and procedures or misappropriate or manipulate our assets for their personal benefit or of third parties to our detriment. This risk is heightened by the fact that we have a large number of complex, valuable contracts with local and foreign third parties. Although we have systems in place for identifying, monitoring and mitigating these risks, our systems may not be effective and we cannot ensure that these compliance policies and processes will prevent intentional, reckless or negligent acts committed by our management, employees, contractors or any person doing business with us. Any failure—real or perceived—by our management, employees, contractors or any person doing business with us to comply with applicable governance or regulatory obligations could harm our reputation, limit our ability to obtain financing and otherwise have a material adverse effect on our business, financial condition and results of operations.

If we fail to comply with any applicable anti-corruption, anti-bribery or anti-money laundering laws, we and our management, employees, contractors or any person doing business with us may be subject to criminal, administrative or civil penalties and other measures, which could have material adverse effects on our reputation, business, financial condition and results of operations. Any investigation of potential violations of anti-corruption, anti-bribery or anti-money laundering laws by governmental authorities in Mexico or other jurisdictions could result in an inability to prepare our consolidated financial statements in a timely manner and could adversely impact our reputation, ability to access financial markets and ability to obtain contracts, assignments, permits and other government authorizations necessary to participate in our industry, which, in turn, could have adverse effects on our business, results of operations and financial condition.

Our management has identified material weaknesses in our internal control over financial reporting for each of the last five years and has concluded that our internal control over financial reporting was not effective at December 31, 2020, which may have a material adverse result on our results of operation and financial condition.

Our management identified one material weaknesses in our internal control over financial reporting in 2020. For further information on the material weakness identified by our management in 2020, see “Item 15—Controls and Procedures—Management’s Annual Report on Internal Control over Financial Reporting.” In light of the identified material weakness, our management concluded that our internal control over financial reporting was not effective at December 31, 2020. Although we are developing and implementing several measures to remedy these material weaknesses, we cannot be certain that there will be no other material weaknesses in our internal control over financial reporting in the future.

In addition, our management identified material weaknesses in our internal control over financial reporting in connection with the preparation of our consolidated financial statements as of and for each of the years ended December 31, 2015, 2016, 2017, 2018, 2019 and 2020. In light of the identified material weaknesses, our management concluded that our internal control over financial reporting was not effective at December 31 of each of those years. We disclosed the circumstances giving rise to these material weaknesses—which were generally different from one year to the next—in our annual reports on Form 20-F corresponding to each of those years. As of the date of this annual report, we believe that each of these material weaknesses has been remediated, except for those in 2019 and 2020 for which we are in the process of implementing the corresponding remediation actions. For more information, see “Item 15––Controls and Procedures––Management’s Annual Report on Internal Control over Financial Reporting”.

If our efforts to remediate the material weaknesses identified in 2020 are unsuccessful, we may be unable to report our results of operations for future periods accurately and in a timely manner and make our required filings with government authorities, including the SEC. We cannot be certain that additional material weaknesses will not develop or be discovered in the future. There is also a risk that there could be accounting errors in our financial reporting, and we cannot be certain that in the future additional material weaknesses will not exist or otherwise be discovered. Any of these occurrences could adversely affect our results of operation and financial condition.

Our compliance with environmental regulations in Mexico, including in connection with efforts to address climate change, could result in material adverse effects on our results of operations.

A wide range of general and industry-specific Mexican federal and state environmental laws and regulations apply to our operations; these laws and regulations are often difficult and costly to comply with and carry substantial penalties for non-compliance. This regulatory burden increases our costs because it requires us to make significant capital expenditures and limits our ability to extract hydrocarbons, resulting in lower revenues. For an estimate of our accrued environmental liabilities, see “Item 4—Information on the Company—Environmental Regulation—Environmental Liabilities.” Growing international concern over greenhouse gas emissions and climate change could result in new laws and regulations that could adversely affect our results of operations and financial condition. International agreements, including the Paris Agreement approved by the Mexican Government, contemplate coordinated efforts to combat climate change. We may become subject to market changes, including carbon taxes, efficiency standards, cap-and-trade and emission allowances and credits. These measures could increase our operating and maintenance costs, increase the price of our hydrocarbon products and possibly shift consumer demand to lower-carbon sources. See “Item 4—Environmental Regulation—Climate Change” for more information on the Mexican Government’s current legal and regulatory framework for combatting climate change.

Discontinuation, reform or replacement of the London Interbank Offered Rate (or LIBOR) or other benchmark interest rates, or uncertainty related to the potential for any of the foregoing, may impact our business.

As of December 31, 2019 and 2020, we had Ps. 151.6 billion (U.S. $8.0 billion) and Ps. 158.8 billion (U.S. $7.9 billion), respectively of variable rate indebtedness linked to LIBOR or other benchmark rates. In July 2017, the U.K. Financial Conduct Authority, which regulates LIBOR, announced its intention to phase out the use of LIBOR by the end of 2023. In addition, other regulators have suggested reforming or replacing other benchmark rates. As there is not yet definitive information regarding the phase-out of LIBOR, we cannot currently predict the effect of the discontinuation, reform or replacement of LIBOR. However, the phase out of LIBOR and the discontinuation, reform or replacement of other benchmark rates may have an unpredictable impact on, or cause disruption to, the broader financial markets or borrowing costs to borrowers. These developments may in turn increase the cost of our variable rate indebtedness or otherwise have an adverse effect on our results of operations and financial condition.

Risk Factors Related to Mexico

Economic conditions and government policies in Mexico and elsewhere may have a material impact on our operations.

A deterioration in Mexico’s economic condition, social instability, political unrest or other adverse social developments in Mexico could adversely affect our business and financial condition. Those events could also lead to increased volatility in the foreign exchange and financial markets, thereby affecting our ability to obtain new financing and service our debt. Additionally, the Mexican Government in November 2015, February 2016 and September 2016 announced budget cuts in response to declines in international crude oil prices. Although the Mexican Government did not reduce our budget in 2017 and announced a budget increase in each of December of 2018 and 2019, given the ongoing impact of the COVID-19 pandemic on our business and the global economy, on July 14, 2020, the Board of Directors of Petróleos Mexicanos authorized the amendment of the 2020 budget for Petróleos Mexicanos and the subsidiary entities. This amendment decreased our budget revenue of Ps. 4.5 billion, which was offset by a net decrease in expenses by Ps. 21.0 billion, consisting of (1) a decrease in investment expenditure by Ps. 28.0 billion (including non-capitalizable maintenance), (2) an increase in operating expense of Ps. 7.0 billion and (3) an increase in financing cost of Ps. 16.5 billion. Further, the Mexican Government may reduce our budget in the future. Any new budget cuts could adversely affect the Mexican economy and, consequently, our business, financial condition, operating results and prospects. See “—Risk Factors Related to our Relationship with the Mexican Government—The Mexican Government controls us and it could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assets” below.

In addition, many countries around the world, including Mexico, are suffering significant economic and social crises as a result of the ongoing COVID-19 pandemic as well as oil price volatility, and these events may continue for a sustained period of time. In addition to these economic effects, the COVID-19 pandemic has, and continues to adversely impact the places in which we operate and our workforce, and could significantly disrupt our operations. Given that the impact of the COVID-19 pandemic will likely continue for an extended period of time, it could adversely affect our ability to operate our business in the manner and on the timelines previously planned. The extent to which COVID-19 or other health pandemics or epidemics may impact Mexico and the Mexican economy and, in turn, our results of operations will depend on future developments, which are highly uncertain and cannot be predicted.

In the past, Mexico has experienced several periods of slow or negative economic growth, high inflation, high interest rates, currency devaluation and other economic problems. These problems may worsen or reemerge, as applicable, in the future and could adversely affect our business and ability to service our debt. A deterioration in international financial or economic conditions, such as a slowdown in growth or recessionary conditions in Mexico’s trading partners, including the United States, or the emergence of a new financial crisis, could have adverse effects on the Mexican economy, our financial condition and our ability to service our debt.

Changes in Mexico’s exchange control laws may hamper our ability to service our foreign currency debt.

The Mexican Government does not currently restrict the ability of Mexican companies or individuals to convert pesos into other currencies. However, we cannot provide assurances that the Mexican Government will maintain its current policies with regard to the peso. In the future, the Mexican Government could impose a restrictive exchange control policy, as it has done in the past. Mexican Government policies preventing us from exchanging pesos into U.S. dollars could hamper our ability to service our foreign currency obligations, including our debt, the majority of which is denominated in currencies other than pesos.

Mexico has experienced a period of increasing criminal activity, which could affect our operations.

In recent years, Mexico has experienced a period of increasing criminal activity, primarily due to the activities of drug cartels and related criminal organizations. In addition, the development of the illicit market in fuels in Mexico has led to increases in theft and illegal trade in the fuels that we produce. In response, the Mexican Government has implemented various security measures and has strengthened its military and police forces, and we have also established various strategic measures aimed at decreasing incidents of theft and other criminal activity directed at our facilities and products. See “Item 8—Financial Information—Legal Proceedings—Actions Against the Illicit Market in Fuels.” Despite these efforts, criminal activity continues to exist in Mexico, some of which may target our facilities and products. These activities, their possible escalation and the violence associated with them, in an extreme case, may have a negative impact on our financial condition and results of operations.

Economic and political developments in Mexico and the United States may adversely affect Mexican economic policy and, in turn, PEMEX’s operations.

Political events in Mexico may significantly affect Mexican economic policy and, consequently, our operations. Presidential and federal congressional elections in Mexico were held on July 1, 2018. Mr. Andrés Manuel López Obrador, a member of the Movimiento Regeneración Nacional (National Regeneration Movement, or MORENA), was elected President of Mexico and took office on December 1, 2018, replacing Mr. Enrique Peña Nieto, a member of the Partido Revolucionario Institucional (Institutional Revolutionary Party, or PRI). The current President’s term will expire on September 30, 2024. As of the date of this annual report, the MORENA party holds an absolute majority in the Cámara de Diputados (Chamber of Deputies). On June 6, 2021, intermediate elections will be held in Mexico to elect 500 members of the Chamber of Deputies. The newly elected members of the Chamber of Deputies will take office on September 1, 2021.

The current administration and the Mexican Congress have the power to revise the legal framework that governs us, and the current administration and the Mexican Congress are discussing a number of reforms that could affect economic conditions or the oil and gas industry in Mexico. Until any reform has been adopted and implemented, we cannot predict how these policies could impact our results of operation and financial position. We cannot provide any assurances that political developments in Mexico will not have an adverse effect on the Mexican economy or oil and gas industry and, in turn, our business, results of operations and financial condition, including our ability to repay our debt.

Economic conditions in Mexico are highly correlated with economic conditions in the United States due to the physical proximity and the high degree of economic activity between the two countries generally, including the trade facilitated by the United States-Mexico-Canada Agreement, or the USMCA, which was signed by the presidents of Mexico, the United States and Canada on November 30, 2018 and subsequently ratified by the legislatures of the three countries. As a result, political developments in the United States, including changes in the administration and governmental policies, can also have an impact on the exchange rate between the U.S. dollar and the Mexican peso, economic conditions in Mexico and the global capital markets.

During 2020, our export sales to the United States amounted to Ps. 303.8 billion, representing 31.9% of total sales and 68.2% of export sales for the year. While the USMCA provides that exports of petrochemical products from Mexico to the United States will continue to enjoy a zero-tariff rate, any shift in the trade relationships between Mexico and the United States and Canada as a result of the implementation of the USMCA could require us to renegotiate our contracts or lose business, resulting in a material adverse impact on our business and results of operations.

In addition, because the Mexican economy is heavily influenced by the U.S. economy, policies that may be adopted by the U.S. government may adversely affect economic conditions in Mexico. These developments could in turn have an adverse effect on our financial condition, results of operations and ability to repay our debt.

Risk Factors Related to our Relationship with the Mexican Government

The Mexican Government controls us and it could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assets.

We are controlled by the Mexican Government and our annual budget may be adjusted by the Mexican Government in certain respects. Pursuant to the Petróleos Mexicanos Law, Petróleos Mexicanos was transformed from a decentralized public entity to a productive state-owned company on October 7, 2014. The Petróleos Mexicanos Law establishes a special regime governing, among other things, our budget, debt levels, administrative liabilities, acquisitions, leases, services and public works. This special regime provides Petróleos Mexicanos with additional technical and managerial autonomy and, subject to certain restrictions, with additional autonomy with respect to our budget. Notwithstanding this increased autonomy, the Mexican Government still controls us and has the power to adjust our financial balance goal, which represents our targeted net cash flow for the fiscal year based on our projected revenues and expenses, and our annual wage and salary expenditures, subject to the approval of the Chamber of Deputies.

The adjustments to our annual budget mentioned above may compromise our ability to develop the reserves assigned to us by the Mexican Government and to successfully compete with other oil and gas companies that may enter the Mexican energy sector. See “Item 4—General Regulatory Framework” for more information about the Mexican Government’s authority with respect to our budget. In addition, the Mexican Government’s control over us could adversely affect our ability to make payments under any securities issued by Petróleos Mexicanos. Although we are wholly owned by the Mexican Government, our financing obligations do not constitute obligations of and are not guaranteed by the Mexican Government. See “—Risk Factors Related to our Relationship with the Mexican Government—Our financing obligations are not guaranteed by the Mexican Government” below.

The Mexican Government’s agreements with international creditors may affect our external debt obligations. In certain past debt restructurings of the Mexican Government, Petróleos Mexicanos’ external indebtedness was treated on the same terms as the debt of the Mexican Government and other public-sector entities, and it may be treated on similar terms in any future debt restructuring. In addition, Mexico has entered into agreements with official bilateral creditors to reschedule public-sector external debt. Mexico has not requested restructuring of bonds or debt owed to multilateral agencies.

The Mexican Government has the power, if the Mexican Constitution and federal law were amended, to reorganize our corporate structure, including a transfer of all or a portion of our assets to an entity not controlled, directly or indirectly, by the Mexican Government. See “—Risk Factors Related to Mexico” above.

Our financing obligations are not guaranteed by the Mexican Government.

Although Petróleos Mexicanos is wholly owned by the Mexican Government, our financing obligations do not constitute obligations of and are not guaranteed by the Mexican Government. As a result, the Mexican Government would have no legal obligation to make principal or interest payments on our debt if we were unable to satisfy our financial obligations.

We pay significant taxes and duties to the Mexican Government, and, if certain conditions are met, we may be required to pay a state dividend, which may limit our capacity to expand our investment program or negatively impact our financial condition generally.

We are required to make significant payments to the Mexican Government, including in the form of taxes and duties, which may limit our ability to make capital investments. For the year ended December 31, 2020, our total taxes and duties were Ps. 185.6 billion, or 19.5% of our sales revenues in the form of taxes and duties, which constituted a substantial portion of the Mexican Government’s revenues. On April 21, 2020, the Mexican Government, through a presidential decree, granted us a reduction in our tax burden equal to Ps. 65.0 billion for 2020 via a tax credit applicable to the Derecho por laUtilidad Compartida (Profit-sharing Duty or “DUC”). During 2020, we applied this tax credit in the amount of Ps. 65.0 billion. On February 19, 2021, the Mexican Government, through a presidential decree, granted us a reduction in our tax burden equal to Ps. 73.3 billion for 2021 via a tax credit applicable to the Profit-sharing Duty.

In addition, we are generally required, subject to the conditions set forth in the Petróleos Mexicanos Law, to pay a state dividend to the Mexican Government. We were not required to pay a state dividend in 2016, 2017, 2018, 2019 and 2020, and we will not be required to pay a state dividend in 2021. See “Item 8—Financial Information—Dividends” for more information. Although the Mexican Government has on occasion indicated a willingness to reduce its reliance on payments made by us and recent changes to the fiscal regime applicable to us are designed in part to reduce such reliance by the Mexican Government, we cannot provide assurances that we will not be required to continue to pay a large proportion of our sales revenue to the Mexican Government. See “Item 4—Information on the Company—Taxes, Duties and Other Payments to the Mexican Government—Fiscal Regime.” In addition, the Mexican Government may change the applicable rules in the future.

The Mexican Government has entered into agreements with other nations to limit production.

Although Mexico is not a member of OPEC, from time to time it enters into agreements with OPEC and non-OPEC countries to reduce global crude oil supply. On April 12, 2020, Mexico entered into an agreement with OPEC+ whereby it agreed to reduce its crude oil production by 100,000 barrels per day for a period of two months beginning on May 1, 2020. During 2020, the average crude oil production (including condensates and not including production from partners) for January through April 2020 reached 1,736 thousand barrels per day. Crude oil production from May through December 2020 averaged 1,662 thousand barrels per day. We do not control the Mexican Government’s international affairs and the Mexican Government could enter into further agreements with OPEC, OPEC+ or other countries to reduce our crude oil production or exports in the future. A reduction in our oil production or exports may have an adverse effect on our business, results of operations and financial condition. For more information, see “Item 4—Trade Regulation, Export Agreements and Production Agreements.”

The Mexican nation, not us, owns the hydrocarbon reserves located in Mexico and our right to continue to extract these reserves is subject to the approval of the Secretaría de Energía (Ministry of Energy or SENER).

The Mexican Constitution provides that the Mexican nation, not us, owns all petroleum and other hydrocarbon reserves located in the subsoil in Mexico. Article 27 of the Mexican Constitution provides that the Mexican Government will carry out exploration and production activities through agreements with third parties and through assignments to and agreements with us. We and other oil and gas companies are allowed to explore and extract the petroleum and other hydrocarbon reserves located in Mexico, subject to assignment of rights by the SENER and entry into agreements pursuant to a competitive bidding process.

Access to crude oil and natural gas reserves is essential to an oil and gas company’s sustained production and generation of income, and our ability to generate income would be materially and adversely affected if the Mexican Government were to restrict or prevent us from exploring or extracting any of the crude oil and natural gas reserves that it has assigned to us or if we are unable to compete effectively with other oil and gas companies in future bidding rounds for additional exploration and production rights in Mexico. For more information, see “—We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our potential to make capital investments” below.

Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions.

The information on oil, gas and other reserves set forth in this annual report is based on estimates. Reserves valuation is a subjective process of estimating underground accumulations of crude oil and natural gas that cannot be measured in an exact manner; the accuracy of any reserves estimate depends on the quality and reliability of available data, engineering and geological interpretation and subjective judgment. Additionally, estimates may be revised based on subsequent results of drilling, testing and production. These estimates are also subject to certain adjustments based on changes in variables, including crude oil prices. Therefore, proved reserves estimates may differ materially from the ultimately recoverable quantities of crude oil and natural gas. Downward revisions in our reserve estimates could lead to lower future production, which could have an adverse effect on our results of operations and financial condition. See “—Risk Factors Related to Our Operations—Crude oil, natural gas and petroleum products prices are volatile and low crude oil and natural gas prices adversely affect our income and cash flows and the amount of hydrocarbon reserves that we have the right to extract and sell” above. We revise annually our estimates of hydrocarbon reserves that we are entitled to extract and sell, which may result in material revisions to these estimates. Our ability to maintain our long-term growth objectives for oil production depends on our ability to successfully develop our reserves, and failure to do so could prevent us from achieving our long-term goals for growth in production.

The Comisión Nacional de Hidrocarburos (National Hydrocarbon Commission, or “CNH”) has the authority to review and approve our estimated hydrocarbon reserves estimates and may require us to adjust these estimates. A request to adjust these reserves estimates could result in our inability to prepare our consolidated financial statements in a timely manner. This could adversely impact our ability to access financial markets, obtain contracts, assignments, permits and other government authorizations necessary to participate in the crude oil and natural gas industry, which, in turn, could have an adverse effect on our business, results of operations and financial condition.

We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our potential to make capital investments.

Because our ability to maintain, as well as increase, our oil production levels is highly dependent upon our ability to successfully develop existing hydrocarbon reserves and, in the long term, upon our ability to obtain the right to develop additional reserves, we continually invest capital to enhance our hydrocarbon recovery ratio and improve the reliability and productivity of our infrastructure.

The development of the reserves that were assigned to us by the Mexican Government will demand significant capital investments and will pose significant operational challenges. Our right to develop the reserves assigned to us is conditioned on our ability to develop such reserves in accordance with our development plans, which were based on our technical, financial and operational capabilities at the time. We cannot provide assurances that we will have or will be able to obtain, in the time frame that we expect, sufficient resources or the technical capacity necessary to explore and extract the reserves that the Mexican Government assigned to us, or that it may grant to us in the future. In the past, we have reduced our capital expenditures in response to declining oil prices, and unless we are able to increase our capital expenditures, we may not be able to develop the reserves assigned to us in accordance with our development plans. We would lose the right to continue to extract these reserves if we fail to develop them in accordance with our development plans, which could adversely affect our operating results and financial condition. In addition, increased competition in the oil and gas sector in Mexico may increase the costs of obtaining additional acreage in potential future bidding rounds for the rights to new reserves.

Our ability to make capital expenditures is limited by the substantial taxes and duties that we pay to the Mexican Government, the ability of the Mexican Government to adjust certain aspects of our annual budget, cyclical decreases in our revenues primarily related to lower oil prices and any constraints on our liquidity. The availability of financing may limit our ability to make capital investments that are necessary to maintain current production levels and decrease the proved hydrocarbon reserves that we are entitled to extract. For more information on the liquidity constraints we are exposed to, see “—We have a substantial amount of indebtedness and other liabilities and are exposed to liquidity constraints, which could make it difficult for us to obtain financing on favorable terms and could adversely affect our financial condition, results of operations and ability to repay our debt and, ultimately, our ability to operate as a going concern” above.

In addition, we have entered into and continue to enter into, strategic alliances, joint ventures and other joint arrangements with third parties in order to develop our reserves. If we were unable to find partners for such joint arrangements, or if our partners were to significantly default on their obligations to us, we may be unable to maintain production levels or extract from our reserves. Moreover, we cannot assure you that these strategic alliances, joint ventures and other joint arrangements will be successful or reduce our capital commitments. For more information, see “—Risk Factors Related to Pemex’s Operations—We participate in strategic alliances, joint ventures and other joint arrangements. These types of arrangements may not perform as expected, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition” above and “Item 4—Information on the Company—History and Development—Capital Expenditures.”

The Mexican Government has historically imposed price controls in the domestic market on our products.

The Mexican Government has from time to time imposed price controls on the sales of natural gas, liquefied petroleum gas, gasoline, diesel, gas oil intended for domestic use, fuel oil and other products. As a result of these price controls, we have not been able to pass on all of the increases in the prices of our product purchases to our customers in the domestic market when the peso depreciates in relation to the U.S. dollar. A depreciation of the peso increases our cost of oil and gas products, without a corresponding increase in our revenues unless we are able to increase the price at which we sell products in Mexico.

In accordance with the Ley de Ingresos de la Federación para el Ejercicio Fiscal de 2017 (2017 Federal Revenue Law), during 2017 the Mexican Government gradually removed price controls on gasoline and diesel as part of the liberalization of fuel prices in Mexico. As of the date of this annual report, sales prices of gasoline and diesel have been fully liberalized and are determined by the free market. For more information, see “Item 4—Information on the Company—Business Overview—Industrial Transformation.” However, we do not control the Mexican Government’s domestic policies and the Mexican Government could impose additional price controls on the domestic market in the future. The imposition of such price controls would adversely affect our results of operations. For more information, see “Item 4—Information on the Company—Business Overview—Refining—Pricing Decrees” and “Item 4—Information on the Company—Business Overview—Gas and Aromatics—Pricing Decrees.”

We may claim some immunities under the Foreign Sovereign Immunities Act and Mexican law, and your ability to sue or recover may be limited.

We are public-sector entities of the Mexican Government. Accordingly, you may not be able to obtain a judgment in a U.S. court against us unless the U.S. court determines that we are not entitled to sovereign immunity with respect to that action. Under certain circumstances, Mexican law may limit your ability to enforce judgments against us in the courts of Mexico. We also do not know whether Mexican courts would enforce judgments of U.S. courts based on the civil liability provisions of the U.S. federal securities laws. Therefore, even if you were able to obtain a U.S. judgment against us, you might not be able to obtain a judgment in Mexico that is based on that U.S. judgment. Moreover, you may not be able to enforce a judgment against our property in the United States except under the limited circumstances specified in the Foreign Sovereign Immunities Act of 1976, as amended. Finally, if you were to bring an action in Mexico seeking to enforce our obligations under any securities issued by Petróleos Mexicanos, satisfaction of those obligations may be made in pesos, pursuant to the laws of Mexico.

Our directors and officers, as well as some of the experts named in this annual report, reside outside the United States. Substantially all of our assets and those of most of our directors, officers and experts are located outside the United States. As a result, investors may not be able to effect service of process on our directors or officers or those experts within the United States.

HISTORY AND DEVELOPMENT

We are the largest company in Mexico according to the July 2020 edition of Expansión magazine, and according to the November 13, 2020 issue of Petroleum Intelligence Weekly, we were the eleventhlargest crude oil producer and the twentieth largestoil and gas company in the world based on data from the year 2019.

Our executive offices are located at Avenida Marina Nacional No. 329, Colonia Verónica Anzures, 11300, Alcandía Miguel Hildalgo, Ciudad de México, México. Our telephone number is (52-55) 9126-8700.

In March 1938, President Lázaro Cárdenas del Río nationalized the foreign-owned oil companies that were then operating in Mexico, and the Mexican Congress established Petróleos Mexicanos through the Decreto que crea la Institución Petróleos Mexicanos (Decree that creates the entity Petróleos Mexicanos), which was published in the Official Gazette of the Federation and took effect on July 20, 1938.

Legal Regime

On December 21, 2013, amendments to Articles 25, 27 and 28 of the Mexican Constitution took effect, including transitional articles setting forth the general framework and timeline for implementing legislation relating to the energy sector.

On August 11, 2014, this implementing legislation was published in the Official Gazette of the Federation. The implementing legislation includes nine new laws, of which the following are most relevant to our operations:

Together, the Hydrocarbons Law and the Hydrocarbons Revenue Law establish the legal framework for the exploration and production of oil and gas through assignments and contracts, as well as the fiscal regime through which the Mexican Government collects revenues from participants in the Mexican oil and gas industry. The Hydrocarbons Law empowers the SENER to determine the appropriate contract model for each area that is subject to a competitive bidding process, while the Ministry of Finance and Public Credit is responsible for determining the economic and fiscal terms of each contract. See “—Taxes, Duties and Other Payments to the Mexican Government—Fiscal Regime” below in this Item 4. The following arrangements comprise the contractual regime established by the current legal framework for upstream activities:

For midstream and downstream activities, including oil refining and natural gas processing, the Hydrocarbons Law establishes a permit regime that is granted by the SENER and the Comisión Reguladora de Energía (Energy Regulatory Commission, or CRE), as applicable. The Hydrocarbons Law also sets forth the process by which entities may apply for these permits. The CRE has issued permits for the retail sale of gasoline and diesel fuel since 2016.

Under the Petróleos Mexicanos Law, Petróleos Mexicanos is a productive state-owned company, wholly owned by the Mexican Government, and has the corporate purpose of generating economic value and increasing the income of the Mexican nation while adhering to principles of equity, as well as social and environmental responsibility.

On December 2, 2014, the special regime provided for in the Petróleos Mexicanos Law, which governs Petróleos Mexicanos’ activities relating to productive state-owned subsidiaries, affiliates, compensation, assets, administrative liabilities, budget, debt levels and the state dividend, took effect. On June 10, 2015, the Disposiciones Generales de Contratación para Petróleos Mexicanos y Sus Empresas Productivas Subsidiarias (General Provisions for Contracting for Petróleos Mexicanos and its Productive State-Owned Subsidiaries) were published in the Official Gazette of the Federation, and on June 11, 2015, the special regime for acquisitions, leases, services and public works became effective.

Corporate Structure

As of December 31, 2020, the principal lines of business of the subsidiary entities are as follows:

Each of these subsidiary entities is a legal entity empowered to own property and carry on business in its own name and has technical and operational autonomy, subject to the central coordination and strategic direction of Petróleos Mexicanos.

Prior to July 27, 2018, Pemex Cogeneración y Servicios (Pemex Cogeneration and Services) operated as an additional productive state-owned subsidiary. On July 13, 2018, the Board of Directors of Petróleos Mexicanos issued the Declaratoria de Liquidación y Extinción de Pemex Cogeneración y Servicios (Declaration of Liquidation and Extinction of Pemex Cogeneration and Services), which was published in the Official Gazette of the Federation and became effective on July 27, 2018. As of July 27, 2018, all of the assets, liabilities, rights and obligations of Pemex Cogeneration and Services were automatically assumed by, and transferred to, Pemex Industrial Transformation, and Pemex Industrial Transformation became, as a matter of Mexican law, the successor to Pemex Cogeneration and Services. Pemex Cogeneration and Services was in turn dissolved effective as of July 27, 2018.

Prior to July 1, 2019, Pemex Perforación y Servicios (Pemex Drilling and Services),Pemex Logística (Pemex Logistics),Pemex Cogeneración y Servicios (Pemex Cogeneration and Services),Pemex Fertilizantes (Pemex Fertilizers) andPemex EtilenoLey de Hidrocarburos (Pemex Ethylene), comprise the state(Hydrocarbons Law) allow other oil and gas companycompanies, in addition to us, to carry out certain activities related to the energy sector in Mexico, including exploration and production activities, and the import and sale of gasoline. As a result, we face competition for the right to explore and develop new oil and gas reserves in Mexico. We also face competition in connection with certain refining, transportation and processing activities. Increased competition could make it difficult for us to hire and retain skilled personnel. While we have not yet experienced significant adverse effects from increased competition, there can be no assurances that we will not experience such adverse effects in the future. If we are unable to compete successfully with other oil and gas companies in the energy sector in Mexico, our results of operations and financial condition may be adversely affected.

We participate in strategic alliances, joint ventures and other joint arrangements. These arrangements may not perform as expected, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

We have entered into and may in the future enter into strategic alliances, joint ventures and other joint arrangements. These arrangements are intended to reduce risks in exploration and production, refining, transportation and processing activities. Our partners in such arrangements may, as a result of financial or other difficulties, be unable or unwilling to fulfill their financial or other obligations under our agreements, threatening the viability of the Unitedrelevant project. In addition, our partners may have inconsistent or opposing economic or business interests and take action contrary to our policies or objectives, which could be to our overall detriment. If our strategic alliances, joint ventures and other joint arrangements do not perform as expected, our reputation may be harmed and our business, financial condition and results of operations could be adversely affected.

We are subject to Mexican States,and international anti-corruption, anti-bribery and anti-money laundering laws. Our failure to comply with these laws could result in penalties, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

We are subject to Mexican and international anti-corruption, anti-bribery and anti-money laundering laws. See “Item 4—Information on the Company—General Regulatory Framework.” Although we maintain policies and processes intended to comply with these laws, including the review of our internal control over financial reporting, we are subject to the risk that our management, employees, contractors or any person doing business with us may engage in fraudulent activity, corruption or bribery, circumvent or override our internal controls and procedures or misappropriate or manipulate our assets for their personal benefit or of third parties to our detriment. This risk is heightened by the fact that we have a large number of complex, valuable contracts with local and foreign third parties. Although we have systems in place for identifying, monitoring and mitigating these risks, our systems may not be effective and we cannot ensure that these compliance policies and processes will prevent intentional, reckless or negligent acts committed by our management, employees, contractors or any person doing business with us. Any failure—real or perceived—by our management, employees, contractors or any person doing business with us to comply with applicable governance or regulatory obligations could harm our reputation, limit our ability to obtain financing and otherwise have a material adverse effect on our business, financial condition and results of operations.

If we fail to comply with any applicable anti-corruption, anti-bribery or anti-money laundering laws, we and our management, employees, contractors or any person doing business with us may be subject to criminal, administrative or civil penalties and other measures, which could have material adverse effects on our reputation, business, financial condition and results of operations. Any investigation of potential violations of anti-corruption, anti-bribery or anti-money laundering laws by governmental authorities in Mexico or other jurisdictions could result in an inability to prepare our consolidated financial statements in a timely manner and could adversely impact our reputation, ability to access financial markets and ability to obtain contracts, assignments, permits and other government authorizations necessary to participate in our industry, which, in turn, could have adverse effects on our business, results of operations and financial condition.

Our management has identified material weaknesses in our internal control over financial reporting for each of the last five years and has concluded that our internal control over financial reporting was not effective at December 31, 2020, which may have a material adverse result on our results of operation and financial condition.

Our management identified one material weaknesses in our internal control over financial reporting in 2020. For further information on the material weakness identified by our management in 2020, see “Item 15—Controls and Procedures—Management’s Annual Report on Internal Control over Financial Reporting.” In light of the identified material weakness, our management concluded that our internal control over financial reporting was not effective at December 31, 2020. Although we are developing and implementing several measures to remedy these material weaknesses, we cannot be certain that there will be no other material weaknesses in our internal control over financial reporting in the future.

In addition, our management identified material weaknesses in our internal control over financial reporting in connection with the preparation of our consolidated financial statements as of and for each of the years ended December 31, 2015, 2016, 2017, 2018, 2019 and 2020. In light of the identified material weaknesses, our management concluded that our internal control over financial reporting was not effective at December 31 of each of those years. We disclosed the circumstances giving rise to these material weaknesses—which were generally different from one year to the next—in our annual reports on Form 20-F corresponding to each of those years. As of the date of this annual report, we believe that each of these material weaknesses has been remediated, except for those in 2019 and 2020 for which we referare in the process of implementing the corresponding remediation actions. For more information, see “Item 15––Controls and Procedures––Management’s Annual Report on Internal Control over Financial Reporting”.

If our efforts to as Mexico. Petróleos Mexicanosremediate the material weaknesses identified in 2020 are unsuccessful, we may be unable to report our results of operations for future periods accurately and in a timely manner and make our required filings with government authorities, including the SEC. We cannot be certain that additional material weaknesses will not develop or be discovered in the future. There is also a productiverisk that there could be accounting errors in our financial reporting, and we cannot be certain that in the future additional material weaknesses will not exist or otherwise be discovered. Any of these occurrences could adversely affect our results of operation and financial condition.

Our compliance with environmental regulations in Mexico, including in connection with efforts to address climate change, could result in material adverse effects on our results of operations.

A wide range of general and state-ownedindustry-specific companyMexican federal and state environmental laws and regulations apply to our operations; these laws and regulations are often difficult and costly to comply with and carry substantial penalties for non-compliance. This regulatory burden increases our costs because it requires us to make significant capital expenditures and limits our ability to extract hydrocarbons, resulting in lower revenues. For an estimate of our accrued environmental liabilities, see “Item 4—Information on the Federal GovernmentCompany—Environmental Regulation—Environmental Liabilities.” Growing international concern over greenhouse gas emissions and climate change could result in new laws and regulations that could adversely affect our results of Mexico, which we refer to asoperations and financial condition. International agreements, including the Paris Agreement approved by the Mexican Government, contemplate coordinated efforts to combat climate change. We may become subject to market changes, including carbon taxes, efficiency standards, cap-and-tradeand emission allowances and credits. These measures could increase our operating and maintenance costs, increase the price of our hydrocarbon products and possibly shift consumer demand to lower-carbon sources. See “Item 4—Environmental Regulation—Climate Change” for more information on the Mexican Government’s current legal and regulatory framework for combatting climate change.

Discontinuation, reform or replacement of the London Interbank Offered Rate (or LIBOR) or other benchmark interest rates, or uncertainty related to the potential for any of the foregoing, may impact our business.

As of December 31, 2019 and 2020, we had Ps. 151.6 billion (U.S. $8.0 billion) and Ps. 158.8 billion (U.S. $7.9 billion), respectively of variable rate indebtedness linked to LIBOR or other benchmark rates. In July 2017, the U.K. Financial Conduct Authority, which regulates LIBOR, announced its intention to phase out the use of LIBOR by the end of 2023. In addition, other regulators have suggested reforming or replacing other benchmark rates. As there is not yet definitive information regarding the phase-out of LIBOR, we cannot currently predict the effect of the discontinuation, reform or replacement of LIBOR. However, the phase out of LIBOR and the discontinuation, reform or replacement of other benchmark rates may have an unpredictable impact on, or cause disruption to, the broader financial markets or borrowing costs to borrowers. These developments may in turn increase the cost of our variable rate indebtedness or otherwise have an adverse effect on our results of operations and financial condition.

Risk Factors Related to Mexico

Economic conditions and government policies in Mexico and elsewhere may have a material impact on our operations.

A deterioration in Mexico’s economic condition, social instability, political unrest or other adverse social developments in Mexico could adversely affect our business and financial condition. Those events could also lead to increased volatility in the foreign exchange and financial markets, thereby affecting our ability to obtain new financing and service our debt. Additionally, the Mexican Government in November 2015, February 2016 and September 2016 announced budget cuts in response to declines in international crude oil prices. Although the Mexican Government did not reduce our budget in 2017 and announced a budget increase in each of December of 2018 and 2019, given the subsidiary entities is a productiveongoing impact of the state-ownedCOVID-19 subsidiarypandemic on our business and the global economy, on July 14, 2020, the Board of Mexico. EachDirectors of Petróleos Mexicanos authorized the amendment of the 2020 budget for Petróleos Mexicanos and the subsidiary entities isentities. This amendment decreased our budget revenue of Ps. 4.5 billion, which was offset by a legal entity empowerednet decrease in expenses by Ps. 21.0 billion, consisting of (1) a decrease in investment expenditure by Ps. 28.0 billion (including non-capitalizable maintenance), (2) an increase in operating expense of Ps. 7.0 billion and (3) an increase in financing cost of Ps. 16.5 billion. Further, the Mexican Government may reduce our budget in the future. Any new budget cuts could adversely affect the Mexican economy and, consequently, our business, financial condition, operating results and prospects. See “—Risk Factors Related to own propertyour Relationship with the Mexican Government—The Mexican Government controls us and carry onit could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assets” below.

In addition, many countries around the world, including Mexico, are suffering significant economic and social crises as a result of the ongoing COVID-19 pandemic as well as oil price volatility, and these events may continue for a sustained period of time. In addition to these economic effects, the COVID-19 pandemic has, and continues to adversely impact the places in which we operate and our workforce, and could significantly disrupt our operations. Given that the impact of the COVID-19 pandemic will likely continue for an extended period of time, it could adversely affect our ability to operate our business in its own name. In addition, a number of subsidiary companies that are defined in Note 1the manner and listed in Note 4 to our consolidated financial statements incorporated in Item 18, which we refer to as our subsidiary companies, are incorporated into the consolidated financial statements; these subsidiary companies are also identified with their corresponding ownership percentages in “––Consolidated Structure of PEMEX” on page 4. As further described under “Item 4—Information on the Company—History and Development—Corporate Reorganization,” the seven new subsidiary entities assumed, ontimelines previously planned. The extent to which COVID-19 or prior to, November 1, 2015, all of the rights and obligations of the prior subsidiary entities of Petróleos Mexicanos—Pemex-Exploración y Producción(Pemex-Exploration and Production),Pemex-Refinación(Pemex-Refining),Pemex-Gas y Petroquímica Básica(Pemex-Gas and Basic Petrochemicals) andPemex-Petroquímica(Pemex-Petrochemicals). References to the subsidiary entities prior to this corporate reorganization refer toPemex-Exploration and Production,Pemex-Refining,Pemex-Gas and Basic Petrochemicals andPemex-Petrochemicals. Petróleos Mexicanos, the subsidiary entities and the subsidiary companies are collectively referred to as “PEMEX”other health pandemics or “we.” See “Item 4—Information on the Company—History and Development—Energy Reform” for more details.

References herein to “U.S. $,” “$,” “U.S. dollars” or “dollars” are to United States dollars. References herein to “pesos” or “Ps.” are to the legal currency of Mexico. References herein to “euros” or “€” are to the legal currency of the European Economic and Monetary Union. References herein to “pounds” or “£” are to the legal currency of the United Kingdom. References herein to “Swiss francs” are to the legal currency of the Swiss Confederation. References herein to “Japanese yen” or “¥” are to the legal currency of Japan. References herein to “Australian dollars” are to the legal currency of Australia. The term “billion” as used herein means one thousand million.

Our consolidated financial statements included in this annual report were prepared in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. We refer in this report to “International Financial Reporting Standards as issued by the International Accounting Standards Board” as IFRS. In addition, these financial statements were audited in accordance with the International Standards on Auditing, as required by theLey del Mercado de Valores (Securities Market Law) and theDisposiciones de carácter general aplicables a las emisoras de valores y a otros participantes del mercado de valores(General Provisions applicable to issuers of securities and other participants in the securities market) in each case, ofepidemics may impact Mexico for purposes of filing with theComisiónNacional Bancaria y de Valores (National Banking and Securities Commission, or the CNBV) and theBolsa Mexicana de Valores, S.A.B. de C.V.(Mexican Stock Exchange), and in accordance with the standards of the Public Company Accounting Oversight Board (United States), or PCAOB, for purposes of filings with the U.S. Securities and Exchange Commission, or the SEC.

The regulations of the SEC do not require foreign private issuers that prepare their financial statements on the basis of IFRS to reconcile such financial statements to United States Generally Accepted Accounting Principles, which we refer to as U.S. GAAP. Accordingly, while we have in the past reconciled our consolidated financial statements prepared in accordance withNormas de Información Financiera Mexicanas(Mexican Financial Reporting Standards) to U.S. GAAP, those reconciliations are no longer presented in our filings with the SEC. We do, however, continue to provide the disclosure required under the U.S. Financial Accounting Standards Board Accounting Standards Codification (ASC) Topic 932 “Extractive Activities—Oil and Gas” (which we refer to as ASC Topic 932), as this is required regardless of the basis of accounting on which we prepare our financial statements.

Mexico has experienced a period of increasing criminal activity, which could affect our operations.

In recent years, Mexico has experienced a period of increasing criminal activity, primarily due to the activities of drug cartels and related criminal organizations. In addition, the development of the illicit market in fuels in Mexico has led to increases in theft and illegal trade in the fuels that we produce. In response, the Mexican Government has implemented various security measures and has strengthened its military and police forces, and we have also established various strategic measures aimed at decreasing incidents of theft and other criminal activity directed at our facilities and products. See “Item 8—Financial Information—Legal Proceedings—Actions Against the Illicit Market in Fuels.” Despite these efforts, criminal activity continues to exist in Mexico, some of which may target our facilities and products. These activities, their possible escalation and the violence associated with them, in an extreme case, may have a negative impact on our financial condition and results of operations.

Economic and political developments in Mexico and the United States may adversely affect Mexican economic policy and, in turn, PEMEX’s operations.

Political events in Mexico may significantly affect Mexican economic policy and, consequently, our operations. Presidential and federal congressional elections in Mexico were held on July 1, 2018. Mr. Andrés Manuel López Obrador, a member of the Movimiento Regeneración Nacional (National Regeneration Movement, or MORENA), was elected President of Mexico and took office on December 1, 2018, replacing Mr. Enrique Peña Nieto, a member of the Partido Revolucionario Institucional (Institutional Revolutionary Party, or PRI). The current President’s term will expire on September 30, 2024. As of the date of this annual report, the MORENA party holds an absolute majority in the Cámara de Diputados (Chamber of Deputies). On June 6, 2021, intermediate elections will be held in Mexico to elect 500 members of the Chamber of Deputies. The newly elected members of the Chamber of Deputies will take office on September 1, 2021.

The current administration and the Mexican Congress have the power to revise the legal framework that governs us, and the pesocurrent administration and the Mexican Congress are discussing a number of reforms that could affect economic conditions or the oil and gas industry in Mexico. Until any reform has been adopted and implemented, we cannot predict how these policies could impact our results of operation and financial position. We cannot provide any assurances that political developments in Mexico will not depreciatehave an adverse effect on the Mexican economy or appreciate significantlyoil and gas industry and, in turn, our business, results of operations and financial condition, including our ability to repay our debt.

Economic conditions in Mexico are highly correlated with economic conditions in the future. DueUnited States due to the volatilityphysical proximity and the high degree of economic activity between the two countries generally, including the trade facilitated by the United States-Mexico-Canada Agreement, or the USMCA, which was signed by the presidents of Mexico, the United States and Canada on November 30, 2018 and subsequently ratified by the legislatures of the peso/U.S. dollar exchange rate,three countries. As a result, political developments in the United States, including changes in the administration and governmental policies, can also have an impact on the exchange rate on any date subsequentbetween the U.S. dollar and the Mexican peso, economic conditions in Mexico and the global capital markets.

During 2020, our export sales to the date hereofUnited States amounted to Ps. 303.8 billion, representing 31.9% of total sales and 68.2% of export sales for the year. While the USMCA provides that exports of petrochemical products from Mexico to the United States will continue to enjoy a zero-tariff rate, any shift in the trade relationships between Mexico and the United States and Canada as a result of the implementation of the USMCA could require us to renegotiate our contracts or lose business, resulting in a material adverse impact on our business and results of operations.

In addition, because the Mexican economy is heavily influenced by the U.S. economy, policies that may be materially differentadopted by the U.S. government may adversely affect economic conditions in Mexico. These developments could in turn have an adverse effect on our financial condition, results of operations and ability to repay our debt.

Risk Factors Related to our Relationship with the Mexican Government

The Mexican Government controls us and it could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assets.

We are controlled by the Mexican Government and our annual budget may be adjusted by the Mexican Government in certain respects. Pursuant to the Petróleos Mexicanos Law, Petróleos Mexicanos was transformed from a decentralized public entity to a productive state-owned company on October 7, 2014. The Petróleos Mexicanos Law establishes a special regime governing, among other things, our budget, debt levels, administrative liabilities, acquisitions, leases, services and public works. This special regime provides Petróleos Mexicanos with additional technical and managerial autonomy and, subject to certain restrictions, with additional autonomy with respect to our budget. Notwithstanding this increased autonomy, the rate indicated above.Mexican Government still controls us and has the power to adjust our financial balance goal, which represents our targeted net cash flow for the fiscal year based on our projected revenues and expenses, and our annual wage and salary expenditures, subject to the approval of the Chamber of Deputies.

The adjustments to our annual budget mentioned above may compromise our ability to develop the reserves assigned to us by the Mexican Government and to successfully compete with other oil and gas companies that may enter the Mexican energy sector. See “Item 3—Key Information—Exchange Rates”4—General Regulatory Framework” for more information regardingabout the ratesMexican Government’s authority with respect to our budget. In addition, the Mexican Government’s control over us could adversely affect our ability to make payments under any securities issued by Petróleos Mexicanos. Although we are wholly owned by the Mexican Government, our financing obligations do not constitute obligations of exchange between pesos and U.S. dollars.

PRESENTATION OF INFORMATION CONCERNING RESERVESare not guaranteed by the Mexican Government. See “—Risk Factors Related to our Relationship with the Mexican Government—Our financing obligations are not guaranteed by the Mexican Government” below.

The proved hydrocarbon reserves includedMexican Government’s agreements with international creditors may affect our external debt obligations. In certain past debt restructurings of the Mexican Government, Petróleos Mexicanos’ external indebtedness was treated on the same terms as the debt of the Mexican Government and other public-sector entities, and it may be treated on similar terms in this report forany future debt restructuring. In addition, Mexico has entered into agreements with official bilateral creditors to reschedule public-sector external debt. Mexico has not requested restructuring of bonds or debt owed to multilateral agencies.

The Mexican Government has the power, if the Mexican Constitution and federal law were amended, to reorganize our corporate structure, including a transfer of all or a portion of our assets to an entity not controlled, directly or indirectly, by the Mexican Government. See “—Risk Factors Related to Mexico” above.

Our financing obligations are not guaranteed by the Mexican Government.

Although Petróleos Mexicanos is wholly owned by the Mexican Government, our financing obligations do not constitute obligations of and are not guaranteed by the Mexican Government. As a result, the Mexican Government would have no legal obligation to make principal or interest payments on our debt if we were unable to satisfy our financial obligations.

We pay significant taxes and duties to the Mexican Government, and, if certain conditions are met, we may be required to pay a state dividend, which may limit our capacity to expand our investment program or negatively impact our financial condition generally.

We are required to make significant payments to the Mexican Government, including in the form of taxes and duties, which may limit our ability to make capital investments. For the year ended December 31, 2020, our total taxes and duties were Ps. 185.6 billion, or 19.5% of our sales revenues in the form of taxes and duties, which constituted a substantial portion of the Mexican Government’s revenues. On April 21, 2020, the Mexican Government, through a presidential decree, granted us a reduction in our tax burden equal to Ps. 65.0 billion for 2020 via a tax credit applicable to the Derecho por laUtilidad Compartida (Profit-sharing Duty or “DUC”). During 2020, we applied this tax credit in the amount of Ps. 65.0 billion. On February 19, 2021, the Mexican Government, through a presidential decree, granted us a reduction in our tax burden equal to Ps. 73.3 billion for 2021 via a tax credit applicable to the Profit-sharing Duty.

In addition, we are generally required, subject to the conditions set forth in the Petróleos Mexicanos Law, to pay a state dividend to the Mexican Government. We were not required to pay a state dividend in 2016, 2017, 2018, 2019 and 2020, and we will not be required to pay a state dividend in 2021. See “Item 8—Financial Information—Dividends” for more information. Although the Mexican Government has on occasion indicated a willingness to reduce its reliance on payments made by us and recent changes to the fiscal regime applicable to us are those that we have the rightdesigned in part to extract and sell based on assignments grantedreduce such reliance by the Mexican Government, we cannot provide assurances that we will not be required to us in August 2014 through the process commonly referredcontinue to as Round Zero and the assignments we have received in subsequent bidding rounds conducted bypay a large proportion of our sales revenue to the Mexican Government. See “Item 4—Information on the Company—HistoryTaxes, Duties and Development—Energy Reform”Other Payments to the Mexican Government—Fiscal Regime.” In addition, the Mexican Government may change the applicable rules in the future.

The Mexican Government has entered into agreements with other nations to limit production.

Although Mexico is not a member of OPEC, from time to time it enters into agreements with OPEC and non-OPEC countries to reduce global crude oil supply. On April 12, 2020, Mexico entered into an agreement with OPEC+ whereby it agreed to reduce its crude oil production by 100,000 barrels per day for a descriptionperiod of two months beginning on May 1, 2020. During 2020, the average crude oil production (including condensates and not including production from partners) for January through April 2020 reached 1,736 thousand barrels per day. Crude oil production from May through December 2020 averaged 1,662 thousand barrels per day. We do not control the Mexican Government’s international affairs and the Mexican Government could enter into further agreements with OPEC, OPEC+ or other countries to reduce our crude oil production or exports in the future. A reduction in our oil production or exports may have an adverse effect on our business, results of operations and financial condition. For more information, see “Item 4—Trade Regulation, Export Agreements and Production Agreements.”

The Mexican nation, not us, owns the hydrocarbon reserves located in Mexico and our right to continue to extract these reserves is subject to the approval of the Round ZeroSecretaría de Energía (Ministry of Energy or SENER).

The Mexican Constitution provides that the Mexican nation, not us, owns all petroleum and other hydrocarbon reserves located in the subsoil in Mexico. Article 27 of the Mexican Constitution provides that the Mexican Government will carry out exploration and production activities through agreements with third parties and through assignments to and agreements with us. We and other oil and gas companies are allowed to explore and extract the petroleum and other hydrocarbon reserves located in Mexico, subject to assignment of rights by the SENER and entry into agreements pursuant to a competitive bidding process.

The estimates of our proved reserves ofAccess to crude oil and natural gas forreserves is essential to an oil and gas company’s sustained production and generation of income, and our ability to generate income would be materially and adversely affected if the five years ended December 31, 2017 included in this report have been calculated accordingMexican Government were to the technical definitions required by the SEC. DeGolyer and MacNaughton, Netherland, Sewell International, S. de R.L. de C.V. (which we refer to as Netherland Sewell) and Ryder Scott Company, L.P. (which we refer to as Ryder Scott) conducted reserves audits of our estimates of our proved hydrocarbon reserves as of December 31, 2017restrict or January 1, 2018, as applicable. All reserves estimates involve some degree of uncertainty. For a descriptionprevent us from exploring or extracting any of the risks relatingcrude oil and natural gas reserves that it has assigned to reservesus or if we are unable to compete effectively with other oil and reserves estimates,gas companies in future bidding rounds for additional exploration and production rights in Mexico. For more information, see “Item 3—Key Information—Risk Factors—Risk Factors Related to our Relationship with the Mexican Government— Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions,” “—We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our abilitypotential to make capital investments” and “—The Mexican nation, not us, owns thebelow.

Information on Mexico’s hydrocarbon reserves located in the subsoil in Mexicois based on estimates, which are uncertain and our right to continue to extract these reserves is subject to the approval of the Ministry of Energy.”

FORWARD-LOOKING STATEMENTSrevisions.

This Form20-F contains words, such as “believe,” “expect,” “anticipate” and similar expressions that identifyforward-looking statements, which reflect our views about future events and financial performance. We have madeforward-looking statements that address, among other things, our:

We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may also affect estimateslimit our potential to make capital investments.

Because our ability to maintain, as well as increase, our oil production levels is highly dependent upon our ability to successfully develop existing hydrocarbon reserves and, in the long term, upon our ability to obtain the right to develop additional reserves, we continually invest capital to enhance our hydrocarbon recovery ratio and improve the reliability and productivity of our infrastructure.

The development of the amountreserves that were assigned to us by the Mexican Government will demand significant capital investments and will pose significant operational challenges. Our right to develop the reserves assigned to us is conditioned on our ability to develop such reserves in accordance with our development plans, which were based on our technical, financial and operational capabilities at the time. We cannot provide assurances that we will have or will be able to obtain, in the time frame that we expect, sufficient resources or the technical capacity necessary to explore and extract the reserves that the Mexican Government assigned to us, or that it may grant to us in the future. In the past, we have reduced our capital expenditures in response to declining oil prices, and unless we are able to increase our capital expenditures, we may not be able to develop the reserves assigned to us in accordance with our development plans. We would lose the right to continue to extract these reserves if we fail to develop them in accordance with our development plans, which could adversely affect our operating results and financial condition. In addition, increased competition in the oil and gas sector in Mexico may increase the costs of Mexico’sobtaining additional acreage in potential future bidding rounds for the rights to new reserves.

Our ability to make capital expenditures is limited by the substantial taxes and duties that we pay to the Mexican Government, the ability of the Mexican Government to adjust certain aspects of our annual budget, cyclical decreases in our revenues primarily related to lower oil prices and any constraints on our liquidity. The availability of financing may limit our ability to make capital investments that are necessary to maintain current production levels and decrease the proved hydrocarbon reserves that we haveare entitled to extract. For more information on the rightliquidity constraints we are exposed to, extract and sell, which could affect our future production levels. Seesee “—Risk Factors Related to our Relationship with the Mexican Government—Information on Mexico’s hydrocarbon reserves is based on estimates, which are uncertain and subject to revisions” below and “Item 11—Quantitative and Qualitative Disclosures About Market Risk—Changes in Exposure to Main Risks—Market Risk—Hydrocarbon Price Risk.”

We have a substantial amount of indebtedness and other liabilities and are exposed to liquidity constraints, which could make it difficult for us to obtain financing on favorable terms and could adversely affect our financial condition, results of operations and ability to repay our debt and, ultimately, our ability to operate as a going concern.concern” above.

We have a substantial amount of debt, whichIn addition, we have incurred primarilyentered into and continue to finance the capital expenditures needed to carry out our capital investment projects. Due to our heavy tax burden, our cash flow from operations in recent years has not been sufficient to fund our capital expendituresenter into, strategic alliances, joint ventures and other expenses and, accordingly, our debt has significantly increased and our working capital has decreased. The sharp decline in oil prices that began in late 2014 has had a negative impact on our ability to generate positive cash flows, which, togetherjoint arrangements with our continued heavy tax burden and increased competition from the private sector, has further exacerbated our ability to fund our capital expenditures and other expenses from cash flow from operations. Therefore,third parties in order to develop our hydrocarbon reservesreserves. If we were unable to find partners for such joint arrangements, or if our partners were to significantly default on their obligations to us, we may be unable to maintain production levels or extract from our reserves. Moreover, we cannot assure you that these strategic alliances, joint ventures and amortize scheduled debt maturities, weother joint arrangements will needbe successful or reduce our capital commitments. For more information, see “—Risk Factors Related to raise financing from a broad rangePemex’s Operations—We participate in strategic alliances, joint ventures and other joint arrangements. These types of funding sources, in addition to implementing the efficiencyarrangements may not perform as expected, which could harm our reputation and cost-cutting initiatives described in this annual report.

DevelopmentsWe may claim some immunities under the Foreign Sovereign Immunities Act and Mexican law, and your ability to sue or recover may be limited.

We are public-sector entities of the Mexican Government. Accordingly, you may not be able to obtain a judgment in a U.S. court against us unless the U.S. court determines that we are not entitled to sovereign immunity with respect to that action. Under certain circumstances, Mexican law may limit your ability to enforce judgments against us in the courts of Mexico. We also do not know whether Mexican courts would enforce judgments of U.S. courts based on the civil liability provisions of the U.S. federal securities laws. Therefore, even if you were able to obtain a U.S. judgment against us, you might not be able to obtain a judgment in Mexico that is based on that U.S. judgment. Moreover, you may not be able to enforce a judgment against our property in the United States except under the limited circumstances specified in the Foreign Sovereign Immunities Act of 1976, as amended. Finally, if you were to bring an action in Mexico seeking to enforce our obligations under any securities issued by Petróleos Mexicanos, satisfaction of those obligations may be made in pesos, pursuant to the laws of Mexico.

Our directors and officers, as well as some of the experts named in this annual report, reside outside the United States. Substantially all of our assets and those of most of our directors, officers and experts are located outside the United States. As a result, investors may not be able to effect service of process on our directors or officers or those experts within the United States.

HISTORY AND DEVELOPMENT

We are the largest company in Mexico according to the July 2020 edition of Expansión magazine, and according to the November 13, 2020 issue of Petroleum Intelligence Weekly, we were the eleventhlargest crude oil producer and the twentieth largestoil and gas company in the world based on data from the year 2019.

Our executive offices are located at Avenida Marina Nacional No. 329, Colonia Verónica Anzures, 11300, Alcandía Miguel Hildalgo, Ciudad de México, México. Our telephone number is (52-55) 9126-8700.

In March 1938, President Lázaro Cárdenas del Río nationalized the foreign-owned oil companies that were then operating in Mexico, and the Mexican Congress established Petróleos Mexicanos through the Decreto que crea la Institución Petróleos Mexicanos (Decree that creates the entity Petróleos Mexicanos), which was published in the Official Gazette of the Federation and took effect on July 20, 1938.

Legal Regime

On December 21, 2013, amendments to Articles 25, 27 and 28 of the Mexican Constitution took effect, including transitional articles setting forth the general framework and timeline for implementing legislation relating to the energy sector.

On August 11, 2014, this implementing legislation was published in the Official Gazette of the Federation. The implementing legislation includes nine new laws, of which the following are most relevant to our operations:

Together, the Hydrocarbons Law and the Hydrocarbons Revenue Law establish the legal framework for the exploration and production of oil and gas through assignments and contracts, as well as the fiscal regime through which the Mexican Government collects revenues from participants in the Mexican oil and gas industry. The Hydrocarbons Law empowers the SENER to determine the appropriate contract model for each area that is subject to a competitive bidding process, while the Ministry of Finance and Public Credit is responsible for determining the economic and fiscal terms of each contract. See “—Taxes, Duties and Other Payments to the Mexican Government—Fiscal Regime” below in this Item 4. The following arrangements comprise the contractual regime established by the current legal framework for upstream activities:

For midstream and downstream activities, including oil refining and natural gas processing, the Hydrocarbons Law establishes a permit regime that is granted by the SENER and the Comisión Reguladora de Energía (Energy Regulatory Commission, or CRE), as applicable. The Hydrocarbons Law also sets forth the process by which entities may apply for these permits. The CRE has issued permits for the retail sale of gasoline and diesel fuel since 2016.

Under the Petróleos Mexicanos Law, Petróleos Mexicanos is a productive state-owned company, wholly owned by the Mexican Government, and has the corporate purpose of generating economic value and increasing the income of the Mexican nation while adhering to principles of equity, as well as social and environmental responsibility.

On December 2, 2014, the special regime provided for in the Petróleos Mexicanos Law, which governs Petróleos Mexicanos’ activities relating to productive state-owned subsidiaries, affiliates, compensation, assets, administrative liabilities, budget, debt levels and the state dividend, took effect. On June 10, 2015, the Disposiciones Generales de Contratación para Petróleos Mexicanos y Sus Empresas Productivas Subsidiarias (General Provisions for Contracting for Petróleos Mexicanos and its Productive State-Owned Subsidiaries) were published in the Official Gazette of the Federation, and on June 11, 2015, the special regime for acquisitions, leases, services and public works became effective.

Corporate Structure

As of December 31, 2020, the principal lines of business of the subsidiary entities are as follows:

Each of these subsidiary entities is a legal entity empowered to own property and carry on business in substantialwrite-downs of the carrying amount of certain of our assets, which could adversely affect our operating resultsits own name and financial condition.

We evaluate on an annual basis, or more frequently where the circumstances require, the carrying amount of our assets for possible impairment. Our impairment tests are performed by a comparison of the carrying amount of an individual asset or acash-generating unit with its recoverable amount. Whenever the recoverable amount of an individual asset orcash-generating unit is less than its carrying amount, an impairment loss is recognized to reduce the carrying amounthas technical and operational autonomy, subject to the recoverable amount.central coordination and strategic direction of Petróleos Mexicanos.

ChangesPrior to July 27, 2018, Pemex Cogeneración y Servicios (Pemex Cogeneration and Services) operated as an additional productive state-owned subsidiary. On July 13, 2018, the Board of Directors of Petróleos Mexicanos issued the Declaratoria de Liquidación y Extinción de Pemex Cogeneración y Servicios (Declaration of Liquidation and Extinction of Pemex Cogeneration and Services), which was published in the economic, regulatory, business or political environment in Mexico or other markets where we operate, such asOfficial Gazette of the liberalization of fuel prices pursuant to energy reformFederation and the significant decline in international crude oil and gas prices in recent years, among other factors, may result in the recognition of impairment charges in certain of our assets. Due to the decline in oil prices, we have performed impairment tests of ournon-financial assets (other than inventories and deferred taxes) at the end of each quarter.became effective on July 27, 2018. As of December 31, 2015 and 2016, we recognized an impairment charge of Ps. 477,945 million and a net reversal of impairment in the amount of Ps. 331,314 million, respectively. As of December 31, 2017, we recognized an impairment charge of Ps. 151,444 million. See Note 12(e) to our consolidated financial statements for further information about the impairment of certain of our assets. Future developments in the economic environment, in the oil and gas industry and other factors could result in further substantial impairment charges, adversely affecting our operating results and financial condition.

Increased competition in the energy sector due to the current legal framework in Mexico could adversely affect our business and financial performance.

TheConstitución Política de los Estados Unidos Mexicanos(Political ConstitutionJuly 27, 2018, all of the Unitedassets, liabilities, rights and obligations of Pemex Cogeneration and Services were automatically assumed by, and transferred to, Pemex Industrial Transformation, and Pemex Industrial Transformation became, as a matter of Mexican States orlaw, the “Mexican Constitution”)successor to Pemex Cogeneration and theServices. Pemex Cogeneration and Services was in turn dissolved effective as of July 27, 2018.

Prior to July 1, 2019, Pemex Perforación y Servicios (Pemex Drilling and Services) and Ley de Hidrocarburos (Hydrocarbons Law) allowsallow other oil and gas companies, in addition to us, to carry out certain activities related to the energy sector in Mexico, including exploration and production activities, and the import and sale of gasoline. As a result, we face competition for the right to explore and develop new oil and gas reserves in Mexico. We will also likely face competition in connection with certain refining, transportation and processing activities. In addition, increasedIncreased competition could make it difficult for us to hire and retain skilled personnel. For more information, see “Item 4—Information on the Company—History and Development—Energy Reform.” While we have not yet experienced significant adverse effects from increased competition, we expect competition to increase further and there can be no assurances that we will not experience such adverse effects in the future. If we are unable to compete successfully with other oil and gas companies in the energy sector in Mexico, our results of operations and financial condition may be adversely affected.

We are increasingly participatingparticipate in strategic alliances, joint ventures and other joint arrangements. These arrangements may not perform as expected, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

In response to the energy reform, weWe have entered into and may in the future enter into strategic alliances, joint ventures and other joint arrangements. These arrangements are intended to reduce risks in exploration and production, refining, transportation and processing activities. Our partners in such arrangements may, as a result of financial or other difficulties, be unable or unwilling to fulfill their financial or other obligations under our agreements, threatening the viability of the relevant project. In addition, our partners may have inconsistent or opposing economic or business interests and take action contrary to our policies or objectives, which could be to our overall detriment. If our strategic alliances, joint ventures and other joint arrangements do not perform as expected, our reputation may be harmed and our business, financial condition and results of operations could be adversely affected.

We are subject to Mexican and internationalanti-corruption,anti-bribery andanti-money laundering laws. Our failure to comply with these laws could result in penalties, which could harm our reputation and have an adverse effect on our business, results of operations and financial condition.

We are subject to Mexican and internationalanti-corruption,anti-bribery andanti-money laundering laws. See “Item 4—Information on the Company—General Regulatory Framework.” Although we maintain policies and processes intended to comply with these laws, including the review of our internal control over financial reporting, we are subject to the risk that our management, employees, contractors or any person doing business with us may engage in fraudulent activity, corruption or bribery, circumvent or override our internal controls and procedures or misappropriate or manipulate our assets for their personal benefit or business advantageof third parties to our detriment. WeThis risk is heightened by the fact that we have in

If we fail to comply with any applicableanti-corruption,anti-bribery oranti-money laundering laws, we and our officers andmanagement, employees, contractors or any person doing business with us may be subject to criminal, administrative or civil penalties and other measures, which could have material adverse effects on our reputation, business, financial condition and results of operations. Any investigation of potential violations ofanti-corruption,anti-bribery oranti-money laundering laws by governmental authorities in Mexico or other jurisdictions could result in an inability to prepare our consolidated financial statements in a timely manner and could adversely impact our reputation, ability to access financial markets and ability to obtain contracts, assignments, permits and other government authorizations necessary to participate in our industry, which, in turn, could have adverse effects on our business, results of operations and financial condition.

Our management has identified material weaknesses in our internal control over financial reporting for each of the last five years and has concluded that our internal control over financial reporting was not effective at December 31, 2020, which may have a material adverse result on our results of operation and financial condition.

Our management identified one material weaknesses in our internal control over financial reporting in 2020. For further information on the material weakness identified by our management in 2020, see “Item 15—Controls and Procedures—Management’s Annual Report on Internal Control over Financial Reporting.” In light of the identified material weakness, our management concluded that our internal control over financial reporting was not effective at December 31, 2020. Although we are developing and implementing several measures to remedy these material weaknesses, we cannot be certain that there will be no other material weaknesses in our internal control over financial reporting in the future.

In addition, our management identified material weaknesses in our internal control over financial reporting in connection with the preparation of our consolidated financial statements as of and for each of the years ended December 31, 2015, 2016, 2017, 2018, 2019 and 2020. In light of the identified material weaknesses, our management concluded that our internal control over financial reporting was not effective at December 31 of each of those years. We disclosed the circumstances giving rise to these material weaknesses—which were generally different from one year to the next—in our annual reports on Form 20-F corresponding to each of those years. As of the date of this annual report, we believe that each of these material weaknesses has been remediated, except for those in 2019 and 2020 for which we are in the process of implementing the corresponding remediation actions. For more information, see “Item 15––Controls and Procedures––Management’s Annual Report on Internal Control over Financial Reporting”.

If our efforts to remediate the material weaknesses identified in 2020 are unsuccessful, we may be unable to report our results of operations for future periods accurately and in a timely manner and make our required filings with government authorities, including the SEC. We cannot be certain that additional material weaknesses will not develop or be discovered in the future. There is also a risk that there could be accounting errors in our financial reporting, and we cannot be certain that in the future additional material weaknesses will not exist or otherwise be discovered. Any of these occurrences could adversely affect our results of operation and financial condition.

Our compliance with environmental regulations in Mexico, including in connection with efforts to address climate change, could result in material adverse effects on our results of operationsoperations..

A wide range of general andindustry-specific Mexican federal and state environmental laws and regulations apply to our operations; these laws and regulations are often difficult and costly to comply with and carry substantial penalties fornon-compliance. This regulatory burden increases our costs because it requires us to make significant capital expenditures and limits our ability to extract hydrocarbons, resulting in lower revenues. For an estimate of our accrued environmental liabilities, see “Item 4—Information on the Company—Environmental Regulation—Environmental Liabilities.” Growing international concern over greenhouse gas emissions and climate change could result in new laws and regulations that could adversely affect our results of operations and financial condition. International agreements, including the Paris Agreement approved by the Mexican Government, contemplate coordinated efforts to combat climate change. We may become subject to market changes, including carbon taxes, efficiency standards,cap-and-trade and emission allowances and credits. These measures could increase our operating and maintenance costs, increase the price of our hydrocarbon products and possibly shift consumer demand tolower-carbon sources. See “Item 4—Environmental Regulation —ClimateRegulation—Climate Change” for more information on the Mexican Government’s current legal and regulatory framework for combatting climate change.

Discontinuation, reform or replacement of the London Interbank Offered Rate (or LIBOR) or other benchmark interest rates, or uncertainty related to the potential for any of the foregoing, may impact our business.

As of December 31, 2019 and 2020, we had Ps. 151.6 billion (U.S. $8.0 billion) and Ps. 158.8 billion (U.S. $7.9 billion), respectively of variable rate indebtedness linked to LIBOR or other benchmark rates. In July 2017, the U.K. Financial Conduct Authority, which regulates LIBOR, announced its intention to phase out the use of LIBOR by the end of 2023. In addition, other regulators have suggested reforming or replacing other benchmark rates. As there is not yet definitive information regarding the phase-out of LIBOR, we cannot currently predict the effect of the discontinuation, reform or replacement of LIBOR. However, the phase out of LIBOR and the discontinuation, reform or replacement of other benchmark rates may have an unpredictable impact on, or cause disruption to, the broader financial markets or borrowing costs to borrowers. These developments may in turn increase the cost of our variable rate indebtedness or otherwise have an adverse effect on our results of operations and financial condition.

Risk Factors Related to Mexico

Economic conditions and government policies in Mexico and elsewhere may have a material impact on our operationsoperations..

A deterioration in Mexico’s economic condition, social instability, political unrest or other adverse social developments in Mexico could adversely affect our business and financial condition. Those events could also lead to increased volatility in the foreign exchange and financial markets, thereby affecting our ability to obtain new financing and service our debt. Additionally, the Mexican Government announced budget cuts in November 2015, February 2016 and September 2016 announced budget cuts in response to declines in international crude oil prices,prices. Although the Mexican Government did not reduce our budget in 2017 and itannounced a budget increase in each of December of 2018 and 2019, given the ongoing impact of the COVID-19 pandemic on our business and the global economy, on July 14, 2020, the Board of Directors of Petróleos Mexicanos authorized the amendment of the 2020 budget for Petróleos Mexicanos and the subsidiary entities. This amendment decreased our budget revenue of Ps. 4.5 billion, which was offset by a net decrease in expenses by Ps. 21.0 billion, consisting of (1) a decrease in investment expenditure by Ps. 28.0 billion (including non-capitalizable maintenance), (2) an increase in operating expense of Ps. 7.0 billion and (3) an increase in financing cost of Ps. 16.5 billion. Further, the Mexican Government may cut spendingreduce our budget in the future. Any new budget cuts could adversely affect the Mexican economy and, consequently, our business, financial condition, operating results and prospects. See “—Risk Factors Related to our Relationship with the Mexican Government—The Mexican Government controls us and it could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assets” below. Any new budget cuts

In addition, many countries around the world, including Mexico, are suffering significant economic and social crises as a result of the ongoing COVID-19 pandemic as well as oil price volatility, and these events may continue for a sustained period of time. In addition to these economic effects, the COVID-19 pandemic has, and continues to adversely impact the places in which we operate and our workforce, and could significantly disrupt our operations. Given that the impact of the COVID-19 pandemic will likely continue for an extended period of time, it could adversely affect our ability to operate our business in the manner and on the timelines previously planned. The extent to which COVID-19 or other health pandemics or epidemics may impact Mexico and the Mexican economy and, consequently,in turn, our business, financial condition, operating results of operations will depend on future developments, which are highly uncertain and prospects.cannot be predicted.

In the past, Mexico has experienced several periods of slow or negative economic growth, high inflation, high interest rates, currency devaluation and other economic problems. These problems may worsen or reemerge,

Mexico has experienced a period of increasing criminal activity, which could affect our operationsoperations..

In recent years, Mexico has experienced a period of increasing criminal activity, primarily due to the activities of drug cartels and related criminal organizations. In addition, the development of the illicit market in fuels in Mexico has led to increases in theft and illegal trade in the fuels that we produce. In response, the Mexican Government has implemented various security measures and has strengthened its military and police forces, and we have also established various strategic measures aimed at decreasing incidents of theft and other criminal activity directed at our facilities and products. See “Item 8—Financial Information—Legal Proceedings—Actions Against the Illicit Market in Fuels.” Despite these efforts, criminal activity continues to exist in Mexico, some of which may target our facilities and products. These activities, their possible escalation and the violence associated with them, in an extreme case, may have a negative impact on our financial condition and results of operations.

Economic and political developments in Mexico and the United States may adversely affect Mexican economic policy and, in turn, PEMEX’s operations.

Political events in Mexico may significantly affect Mexican economic policy and, consequently, our operations. Enrique Peña Nieto,Presidential and federal congressional elections in Mexico were held on July 1, 2018. Mr. Andrés Manuel López Obrador, a member of thePartido Revolucionario InstitucionalMovimiento Regeneración Nacional(Institutional Revolutionary Party (National Regeneration Movement, or PRI)MORENA), was elected President of Mexico and took office on December 1, 2012.2018, replacing Mr. Enrique Peña Nieto, a member of the Partido Revolucionario Institucional (Institutional Revolutionary Party, or PRI). The current President’s term will expire on September 30, 2024. As of the date of this annual report, no politicalthe MORENA party holds a simplean absolute majority in either housethe Cámara de Diputados (Chamber of the Mexican Congress.

Presidential and federal congressionalDeputies). On June 6, 2021, intermediate elections in Mexico will be held in July 2018.Mexico to elect 500 members of the Chamber of Deputies. The newly elected members of the Chamber of Deputies will take office on September 1, 2021.

The current administration and the Mexican presidential election will result inCongress have the power to revise the legal framework that governs us, and the current administration and the Mexican Congress are discussing a change in administration, as presidential reelection is not permittednumber of reforms that could affect economic conditions or the oil and gas industry in Mexico. Until any reform has been adopted and implemented, we cannot predict how these policies could impact our results of operation and financial position. We cannot provide any assurances that political developments in Mexico will not have an adverse effect on the Mexican economy or oil and gas industry and, in turn, our business, results of operations and financial condition, including our ability to repay our debt.

Economic conditions in Mexico are highly correlated with economic conditions in the United States due to the physical proximity and the high degree of economic activity between the two countries generally, including the trade facilitated by the North American Free TradeUnited States-Mexico-Canada Agreement, (“NAFTA”).or the USMCA, which was signed by the presidents of Mexico, the United States and Canada on November 30, 2018 and subsequently ratified by the legislatures of the three countries. As a result, political developments in the United States, including changes in the administration and governmental policies, can also have an impact on the exchange rate between the U.S. dollar and the Mexican peso, economic conditions in Mexico and the global capital markets.

Since 2003,During 2020, our export sales to the United States amounted to Ps. 303.8 billion, representing 31.9% of total sales and 68.2% of export sales for the year. While the USMCA provides that exports of petrochemical products from Mexico to the United States have enjoyedwill continue to enjoy azero-tariff rate, under NAFTAany shift in the trade relationships between Mexico and subject to limited exceptions, exports of crude oil and petroleum products have also been free or exempt from tariffs. During 2017, our export sales to the United States amounted to Ps. 302.9 billion, representing 21.7% of total sales and 59.6% of export sales for the year. In August 2017, Mexico, the United

Risk Factors Related to our Relationship with the Mexican Government

The Mexican Government controls us and it could limit our ability to satisfy our external debt obligations or could reorganize or transfer us or our assetsassets..

We are controlled by the Mexican Government and our annual budget may be adjusted by the Mexican Government in certain respects. Pursuant to the Petróleos Mexicanos Law, Petróleos Mexicanos was transformed from a decentralized public entity to a productivestate-owned company on October 7, 2014. The Petróleos Mexicanos Law establishes a special regime governing, among other things, our budget, debt levels, administrative liabilities, acquisitions, leases, services and public works. This special regime provides Petróleos Mexicanos with additional technical and managerial autonomy and, subject to certain restrictions, with additional autonomy with respect to our budget. Notwithstanding this increased autonomy, the Mexican Government still controls us and has the power to adjust our financial balance goal, which represents our targeted net cash flow for the fiscal year based on our projected revenues and expenses, and our annual wage and salary expenditures, subject to the approval of theCámara de Diputados (Chamber Chamber of Deputies).Deputies.

The adjustments to our annual budget mentioned above may compromise our ability to develop the reserves assigned to us by the Mexican Government and to successfully compete with other oil and gas companies that may enter the Mexican energy sector. See “Item 4—General Regulatory Framework” for more information about the Mexican Government’s authority with respect to our budget. In addition, the Mexican Government’s control over us could adversely affect our ability to make payments under any securities issued by Petróleos Mexicanos. Although Petróleos Mexicanos iswe are wholly owned by the Mexican Government, our financing obligations do not constitute obligations of and are not guaranteed by the Mexican Government. See “—Risk Factors Related to our Relationship with the Mexican Government—Our financing obligations are not guaranteed by the Mexican Government” below.

The Mexican Government’s agreements with international creditors may affect our external debt obligations. In certain past debt restructurings of the Mexican Government, Petróleos Mexicanos’ external indebtedness was treated on the same terms as the debt of the Mexican Government and other public-sector entities, and it may be treated on similar terms in any future debt restructuring. In addition, Mexico has entered into agreements with official bilateral creditors to reschedule public-sector external debt. Mexico has not requested restructuring of bonds or debt owed to multilateral agencies.

The Mexican Government has the power, if the Mexican Constitution and federal law were further amended, to further reorganize our corporate structure, including a transfer of all or a portion of our assets to an entity not controlled, directly or indirectly, by the Mexican Government. See “—Risk Factors Related to Mexico” above.

The Mexican Government has historically imposed price controls in the domestic market on our products.entered into agreements with other nations to limit production.

The Mexican Government hasAlthough Mexico is not a member of OPEC, from time to time imposed price controlsit enters into agreements with OPEC and non-OPEC countries to reduce global crude oil supply. On April 12, 2020, Mexico entered into an agreement with OPEC+ whereby it agreed to reduce its crude oil production by 100,000 barrels per day for a period of two months beginning on May 1, 2020. During 2020, the sales of natural gas, liquefied petroleum gas, gasoline, diesel, gasaverage crude oil intendedproduction (including condensates and not including production from partners) for domestic use, fuelJanuary through April 2020 reached 1,736 thousand barrels per day. Crude oil and other products. As a result of these price controls, we have not been able to pass on all of the increases in the prices of our product purchases to our customers in the domestic market when the peso depreciates in relation to the U.S. dollar. A depreciation of the peso increases our cost of imported oil and gas products, without a corresponding increase in our revenues unless we are able to increase the price at which we sell products in Mexico.

In accordance with theLey de Ingresos de la Federación para el Ejercicio Fiscal de 2017 (2017 Federal Revenue Law), during 2017 the Mexican Government gradually removed price controls on gasoline and diesel as part of the liberalization of fuel prices in Mexico. As of the date of this annual report, sales prices of gasoline and diesel have been fully liberalized and are determined by the free market. For more information, see “Item 4—Information on the Company—Business Overview—Industrial Transformation.” However, weproduction from May through December 2020 averaged 1,662 thousand barrels per day. We do not control the Mexican Government’s domestic policiesinternational affairs and the Mexican Government could impose additional price controls on the domestic marketenter into further agreements with OPEC, OPEC+ or other countries to reduce our crude oil production or exports in the future. The imposition of such price controls would adversely affectA reduction in our oil production or exports may have an adverse effect on our business, results of operations.operations and financial condition. For more information, see “Item 4—Information on the Company—Business Overview—Refining—Pricing”Trade Regulation, Export Agreements and “Item 4—Information on the Company—Business Overview—Gas and Basic Petrochemicals—Pricing.Production Agreements.”

The Mexican nation, not us, owns the hydrocarbon reserves located in the subsoil in Mexico and our right to continue to extract these reserves is subject to the approval of the MinistrySecretaría de Energía (Ministry of Energy or SENER)..

The Mexican Constitution provides that the Mexican nation, not us, owns all petroleum and other hydrocarbon reserves located in the subsoil in Mexico.

Article 27 of the Mexican Constitution provides that the Mexican Government will carry out exploration and production activities through agreements with third parties and through assignments to and agreements with us. The Secondary Legislation allows usWe and other oil and gas companies are allowed to explore and extract the petroleum and other hydrocarbon reserves located in Mexico, subject to assignment of rights by the Ministry of EnergySENER and entry into agreements pursuant to a competitive bidding process.

Access to crude oil and natural gas reserves is essential to an oil and gas company’s sustained production and generation of income, and our ability to generate income would be materially and adversely affected if the

We must make significant capital expenditures to maintain our current production levels, and to maintain, as well as increase, the proved hydrocarbon reserves assigned to us by the Mexican Government. Reductions in our income, adjustments to our capital expenditures budget and our inability to obtain financing may limit our abilitypotential to make capital investmentsinvestments..

Because our ability to maintain, as well as increase, our oil production levels is highly dependent upon our ability to successfully develop existing hydrocarbon reserves and, in the long term, upon our ability to obtain the right to develop additional reserves, we continually invest capital to enhance our hydrocarbon recovery ratio and improve the reliability and productivity of our infrastructure. During 2017, our total proved reserves decreased by 868.1 million barrels of oil equivalent, or 10.1%, after accounting for discoveries, extensions, revisions, and delimitations, from 8,562.8 million barrels of crude oil equivalent as of December 31, 2016 to 7,694.7 million barrels of crude oil equivalent as of December 31, 2017. See “Item 4—Information on the Company—Business Overview––Exploration and Production––Reserves” for more information about the factors leading to this decline. Our crude oil production decreased by 1.0% from 2012 to 2013, by 3.7% from 2013 to 2014, by 6.7% from 2014 to 2015, by 5.0% from 2015 to 2016 and by 9.5% from 2016 to 2017, primarily as a result of the decline of the Cantarell, Crudo Ligero Marino, El Golpe-Puerto Ceiba, Bellota-Chinchorro, Antonio J. Bermúdez, Cactus-Sitio Grande, Ixtal-Manik, Chuc, Costero Terreste andTsimín-Xux projects.

We may claim some immunities under the Foreign Sovereign Immunities Act and Mexican law, and your ability to sue or recover may be limitedlimited..

We arepublic-sector entities of the Mexican Government. Accordingly, you may not be able to obtain a judgment in a U.S. court against us unless the U.S. court determines that we are not entitled to sovereign immunity with respect to that action. Under certain circumstances, Mexican law may limit your ability to enforce judgments against us in the courts of Mexico. We also do not know whether Mexican courts would enforce judgments of U.S. courts based on the civil liability provisions of the U.S. federal securities laws. Therefore, even if you were able to obtain a U.S. judgment against us, you might not be able to obtain a judgment in Mexico

Together, the Hydrocarbons Law and the Hydrocarbons Revenue Law establish the legal framework for the exploration and production of oil and gas through assignments and contracts, as well as the new fiscal regime through which the Mexican Government will collectcollects revenues from participants in the Mexican oil and gas industry. The Hydrocarbons Law empowers the Ministry of EnergySENER to determine the appropriate contract model for each area that is subject to a competitive bidding process, while the Ministry of Finance and Public Credit is responsible for determining the economic and fiscal terms of each contract. See “—Taxes, Duties and Other

Prior to July 27, 2018, Pemex Cogeneración y Servicios (Pemex Cogeneration and Services) operated as an additional productive state-owned subsidiary. On March 27, 2015,July 13, 2018, the Board of Directors of Petróleos Mexicanos adoptedissued the acuerdosDeclaratoria de creacióLiquidación y Extinción de Pemex Cogeneración y Servicios (creation resolutions) for each(Declaration of Liquidation and Extinction of Pemex Cogeneration and Services), which was published in the Official Gazette of the newFederation and became effective on July 27, 2018. As of July 27, 2018, all of the assets, liabilities, rights and obligations of Pemex Cogeneration and Services were automatically assumed by, and transferred to, Pemex Industrial Transformation, and Pemex Industrial Transformation became, as a matter of Mexican law, the successor to Pemex Cogeneration and Services. Pemex Cogeneration and Services was in turn dissolved effective as of July 27, 2018.

Prior to July 1, 2019, Pemex Perforación y Servicios (Pemex Drilling and Services) and Pemex Etileno (Pemex Ethylene) operated as additional productive state-owned subsidiaries, allsubsidiaries. On July 25, 2019, the Board of Directors of Petróleos Mexicanos issued the Declaratoria de Extinción de Pemex Perforación y Servicios (Declaration of Extinction of Pemex Drilling and Services) and the Declaratoria de Extinción de Pemex Etileno (Declaration of Extinction of Pemex Ethylene), both of which were subsequently published in the Official Gazette of the Federation on April 28, 2015.

The principal linesJuly 30, 2019 and became effective on July 1, 2019. As of businessJuly 1, 2019, all of the new productive state-owned subsidiaries are as follows:

Source: Petróleos Mexicanos.

Our budget for 20182021 includes a total of Ps. 113.2352.7 billion for capital expenditures.expenditures, including Ps. 110.6 billion for non-capitalizable maintenance and Ps. 47.6 billion for financial investment. The financial investment budget includes Ps. 45.1 billion in capital contributions to our subsidiary company PTI Infraestructura de Desarrollo, S.A. de C.V. for the construction of our new refinery in Dos Bocas, Paraíso, Tabasco and Ps. 2.5 billion in capital contributions to the subsidiaries of our fertilizers business line. Our net capital expenditures budget is Ps. 194.5 billion. We expect to direct Ps.81.8Ps. 179.3 billion (or 72.2% of our total capital expenditures)92.2 %) to exploration and production programs in 2018.2021. This investment in exploration and production activities reflects our focus on maximizing the potential of our hydrocarbon reserves and our most productive projects, the promotion ofprojects. In addition, in 2021 we expect to direct Ps. 11.7 billion (or 6.0%) to ourfarm-out program, which we believe will allow

Entering 2021, our hydrocarbons. Our production goals for 2018 include producing crude oil at a level of approximately 1,930.41,876.7 thousand barrels per day and maintaining natural gas production above 4,6565,335.1 million cubic feet per day. We aim to meet these production goals through exploration and development activities, increasing inventory reserves through new discoveries and reclassifications and managing the decline in field production by increasingfocusing our participationexploration and production activities in future bidding roundsareas where we have greater experience and higher historical success rates, such as secondary and tertiary recovery systems. In addition, we intend to reallocate resources away from deep-water projects, which tend to be expensive and long-term activities, and towards shallow water and onshore projects, which have the potential for near-term results. We plan to continue the development of 26 new fields in order2021. 22 of which are in shallow waters, 18 of which are the original fields we began to enter into new partnershipsdevelop in 2019 and farm-outs.4 were added in 2020. Four of these fields are onshore and have been in development since 2019. We expect that these 26 fields will be able to produce an aggregate of up to 320.9 thousand barrels per day of crude oil during 2021.

Industrial Transformation

Our industrial transformation segment is comprised of twofour principal activities: (i) refining, and (ii) gas and aromatics:aromatics, (iii) ethylene and derivatives and (iv) fertilizers, since January 1, 2021:

Refining

Pemex Industrial Transformation converts crude oil into gasoline, jet fuel, diesel, fuel oil, asphalts and lubricants. We also distribute and market most of these products throughout Mexico. During 2017,2020, atmospheric

Ethylene and Derivatives

Pemex Industrial Transformation produces, distributes and markets ethane and propylene derivatives. In 2020, we produced a total of 1,146.8 thousand tons of petrochemical products, a 28.8% decrease from the 1,610.8 thousand tons of petrochemical products produced in 2019. This decrease was mainly due to limited operating capacity at our units because of problems with auxiliary services, operational failures and an unscheduled reduction in the commercialization of monoethylene glycol caused by a decrease in the supplyprices of sour wet gas from our Marine and Southern regions, as wellmonoethylene glycol as the result of an oversupply in the international market, due to which we elected to reduce production.

Our ethylene segment leverages the integration of the ethane production chain to manufacture several petrochemical products, including:

The primary goals for our ethylene and derivatives segment in 2021 are to increase the Burgos basin.

In 2018, we expect to have a lower supply of natural gas from our fields, which would require us to import higher volumes of natural gas to satisfy domestic demand. In addition, we are evaluating several alternatives for the useusage of our sour wet gas with high nitrogen content.installed capacity of ethylene and derivatives units through rehabilitation and technological improvements and to increase the availability of raw material.

Fertilizers

OurPrior to January 1, 2021, Pemex Fertilizers operated as an additional productive state-owned subsidiary. As of January 1, 2021, Pemex Fertilizers was merged into Pemex Industrial Transformation. Therefore, our fertilizers segment operated through the productive state-owned subsidiary Pemex Fertilizers until December 31, 2020, and operates through the productive state-owned subsidiary Pemex Fertilizers andIndustrial Transformation as of January 1, 2021 as a line of business.

Our fertilizers business integrates the ammonia production chain up to the point of sale of fertilizers, including urea (produced at our Pajaritos petrochemical complex), agricultural and industrial nitrates, phosphate fertilizers and acids, (producedwhich are produced by Fertinal).

Grupo Fertinal, S.A. de C.V. Our strategies focus on: (1) increasing the economic value of our segment by generating diverse investment opportunitiessubsidiary Pro-Agroindustria, S.A. de C.V. began to intermittently produce urea beginning in April 2020. Pro-Agroindustria, S.A. de C.V. ceased operations in the agricultural sectorsecond half of December 2020 due to interruption in Mexico and (2) ensuring a reliablethe supply of raw materials for our plants through a long-term contract that sustains operations at our four ammonia plants.

Ethylenematerials.

Our ethylene segment operatesprimary goal for 2021 is to leverage the synergies created by our merger into Pemex Industrial Transformation to reduce costs and reactivate our ammonia production. In particular, we aim to maintain reliable fertilizer production and strengthen our fertilizer business through the productive state-owned subsidiary Pemex Ethylenemaintenance to our ammonia VI plant, our storage units and takes advantage of the integration of the ethylene production chain. In 2017, we produced a total of 1,884.0 thousand tons of petrochemical products, a 25.5% decrease from the 2,528.7 thousand tons of petrochemical products produced in 2016.

As of the date of this annual report, we have transferred certain assets of our cogeneration and services segment to Pemex Industrial Transformation.

International Trading

The international trading segment whichprovides us with international trading, distribution, risk management, insurance and transportation services. This segment operates through P.M.I. Comercio Internacional, S.A. de C.V. (which we refer to as PMI), P.M.I. Trading Designated Activity Company (formerly P.M.I. Trading, Ltd., which we refer to as P.M.I. Trading DAC), P.M.I. Norteamérica, S.A. de C.V., (which we refer to as PMI-NASA, and, together with PMI and P.M.I. Trading DAC, we collectively refer to as the “PMI Subsidiaries”)PMI Subsidiaries) and Mex Gas International, Ltd.,S.L. (which, together with the PMI Subsidiaries, we collectively refer to as the “Trading Companies”) provides us with international trading, distribution, risk management, insurance and transportation services.Trading Companies). Certain of the Trading Companies sell, buy and transport crude oil, refined products and petrochemicals in world markets, and provide related risk management, insurance, transportation and storage services. The Trading Companies have offices in Mexico City, Houston Amsterdam, Singapore and Madrid.Singapore. Export sales are made through PMI to approximately 32 major customers in various foreign markets.

In 2017,2020, our crude oil exports decreasedincreased in volume by 1.7%1.5%, from 1,194.31,103.3 thousand barrels per day in 20162019 to 1,174.01,119.9 thousand barrels per day in 2017.2020. Natural gas imports decreased by 8.7%11.7% in 2017,2020, from 1,933.9965.9 million cubic feet per day in 20162019 to 1,766.0853.1 million cubic feet per day in 2017.2020. In 2017,2020, our exports of petrochemical products decreased 51.6%by 44.1%, from 124.771.9 thousand metric tons in 20162019 to 60.440.2 thousand metric tons in 2017, while2020, and our imports of petrochemical products increased 19.6%decreased by 56.0%, from 278.2877.3 thousand metric tons in 20162019 to 332.8386.0 thousand metric tons in 2017.2020. In 2017,2020, our exports of other petroleum products decreased 14.8%and liquefied petroleum gas increased by 54.4%, from 185.582.3 thousand barrels per day in 20162019 to 158.0127.1 thousand barrels per day in 2017, while2020, and our imports of other petroleum products and liquefied petroleum gas increased 17.0%decreased by 34.7%, from 800.4302.5 thousand barrels per day in 20162019 to 936.2197.4 thousand barrels per day in 2017.2020. As a major supplier of crude oil to the United States, our international trading segment’s crude oil exports to the United States totaled U.S. $10.5$8.7 billion in 2017, an increase2020, a decrease of U.S. $3.0$3.9 billion from 2016.with respect to 2019.

Infrastructure of PEMEX

Exploration and Production

Following our 2015 corporate reorganization, certain business units and assets that were operated by our exploration and production segment were transferred to our drilling and services segment upon the formation of Pemex Drilling and Services on August 1, 2015. For the year ended December 31, 2015, we have not presented separately the operating results of our drilling and services segment in this Item 4 and, accordingly, the results of our exploration and production segment include the results of that segment for this period. Operating results for both the exploration and production and drilling and services segments are presented separately for periods beginning January 1, 2016. For a detailed description of the financial results of each segment, see our consolidated financial statements included herein.

Exploration and Drilling

We seek to identify new oil reservoirs through our exploration program in order to increase the future replacement rate of proved reserves. From 1990 to 2017,2020, we completed 13,22913,795 exploration and development wells. During 2017,2020, our average success rate for exploratory wells was 62.5%35.3%, an 18.5% increasea 16.9% decrease as compared to 20162019 and our average success rate for development wells was 92.9%95.2%, an 8.1%a 1.3% increase as compared to 2016.2019. From 20132016 to 2017,2020, we discovered 1520 new crude oil fields. We discovered three of these new crude oil fields and 7 new natural gas fields,during 2020, bringing the total number of our crude oil and natural gas producing fields to 397313 at the end of 2017.2020.

Our 20172020 exploration program was comprised of exploration in both onshore regions and offshore regions includingin the deep waters of the Gulf of Mexico. These exploratory activities yielded 246130.6 million barrels of oil equivalent of proved reserves resulting from the discovery of onethree oil producing fieldfields and two gas and condensatethree reservoirs in existing fields, as well as from the drilling of three appraisal wells in existing fields. In addition, we discovered a new reservoir at one of the fields.

producing fields. We continued our main seismic data acquisition activities, in particular, those related to three-dimensional seismic data. In 2017, we acquired 14,276 square kilometers of three-dimensional seismic data in deep and shallow waters.

The following table summarizes our drilling activity for the five years ended December 31, 2017,2020, all of which occurred in Mexican territory.