Preliminary Results

Second Quarter 2013

July 26, 2013

Forward-Looking Statement and

Cautionary Note (1/2)

1

Variations

If no further specification is included, changes are made against the same period of the last year.

Rounding

Numbers may not total due to rounding.

Financial information

Excluding budgetary and volumetric information, the financial information included in this report and the annexes hereto is based on unaudited

consolidated financial statements prepared in accordance with International Financial Reporting Standards as issued by the International Accounting

Standards Board (“IFRS”), which PEMEX has adopted effective January 1, 2012. Information from prior periods has been retrospectively adjusted in certain

accounts to make it comparable with the unaudited consolidated financial information under IFRS. For more information regarding the adoption of IFRS,

see Note 20 to the consolidated financial statements included in Petróleos Mexicanos’ 2011 Form 20-F filed with the SEC on April 30, 2012. Adjusted

EBITDA is a non-IFRS measure. We show a reconciliation of Adjusted EBITDA to net income in Table [34] of the annexes to this report. EBITDA is a non-

U.S. GAAP and non-FRS measure issued by the CINIF.

Budgetary information is based on standards from Mexican governmental accounting; therefore, it does not include information from the subsidiary

companies of Petróleos Mexicanos.

Foreign exchange conversions

Convenience translations into U.S. dollars of amounts in Mexican pesos have been made at the established exchange rate, as of June 30, 2013, of Ps.

12.9502 = U.S.$1.00. Such translations should not be construed as a representation that the peso amounts have been or could be converted into U.S.

dollars at the foregoing or any other rate.

Fiscal regime

Since January 1, 2006, PEMEX has been subject to a new fiscal regime. Pemex-Exploration and Production’s (PEP) tax regime is governed by the Federal

Duties Law, while the tax regimes of the other Subsidiary Entities continue to be governed by Mexico’s Income Tax Law. The most important duty paid by

PEP is the Ordinary Hydrocarbons Duty (OHD), the tax base of which is a quasi operating profit. In addition to the payment of the OHD, PEP is required to

pay other duties.

Under PEMEX’s current fiscal regime, the Special Tax on Production and Services (IEPS) applicable to gasoline and diesel is regulated under the Federal

Income Law. PEMEX is an intermediary between the Secretary of Finance and Public Credit (SHCP) and the final consumer; PEMEX retains the amount of

IEPS and transfers it to the Federal Government. The IEPS rate is calculated as the difference between the retail or “final price”, and the “producer

price”. The final prices of gasoline and diesel are established by the SHCP. PEMEX’s producer price is calculated in reference to that of an efficient

refinery operating in the Gulf of Mexico. Since 2006, if the final price is lower than the producer price, the SHCP credits to PEMEX the difference among

them. The IEPS credit amount is accrued, whereas the information generally presented by the SHCP is cash-flow.

Hydrocarbon reserves

Pursuant to Article 10 of the Regulatory Law to Article 27 of the Political Constitution of the United Mexican States Concerning Petroleum Affairs, (i)

PEMEX's reports evaluating hydrocarbon reserves shall be approved by the National Hydrocarbons Commission (NHC); and (ii) the Secretary of Energy will

register and disclose Mexico's hydrocarbon reserves based on information provided by the NHC. As of the date of this report, this process is ongoing.

Forward-Looking Statement and

Cautionary Note (2/2)

2

Hydrocarbon reserves

As of January 1, 2010, the SEC changed its rules to permit oil and gas companies, in their filings with the SEC, to disclose not only proved reserves, but

also probable reserves and possible reserves. In addition, we do not necessarily mean that the probable or possible reserves described herein meet the

recoverability thresholds established by the SEC in its new definitions. Investors are urged to consider closely the disclosure in our Form 20-F and our

annual report to the Mexican Banking and Securities Commission, available at http://www.pemex.com/.

Forward-looking statements

This report contains forward-looking statements. We may also make written or oral forward-looking statements in our periodic reports to the CNBV and the

SEC, in our annual reports, in our offering circulars and prospectuses, in press releases and other written materials and in oral statements made by our

officers, directors or employees to third parties. We may include forward-looking statements that address, among other things, our:

– Drilling and other exploration activities;

– Import and export activities;

– Projected and targeted capital expenditures; costs; commitments; revenues; liquidity, etc.

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:

– Changes in international crude oil and natural gas prices;

– Effects on us from competition;

– Limitations on our access to sources of financing on competitive terms;

– Significant economic or political developments in Mexico;

– Developments affecting the energy sector; and

– Changes in our regulatory environment.

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. These risks and uncertainties

are more fully detailed in PEMEX’s most recent Form 20-F filing with the SEC (www.sec.gov), and the PEMEX prospectus filed with the CNBV and available

through the Mexican Stock Exchange (www.bmv.com.mx). These factors could cause actual results to differ materially from those contained in any

forward-looking statement.

PEMEX

PEMEX is Mexico’s national oil and gas company. Created in 1938, it is the exclusive producer of Mexico’s oil and gas resources. The operating subsidiary

entities are Pemex-Exploration and Production, Pemex-Refining, Pemex-Gas and Basic Petrochemicals and Pemex-Petrochemicals. The principal subsidiary

company is PMI.

Content

3

Highlights

Upstream

Downstream

Financial Results

Questions and Answers

Highlights 2Q13

4

Total revenues amounted to Ps. 393.2 billion.

Cost of sales decreased by 12.2%.

Total hydrocarbons production averaged 3,644 Mboed.

Crude oil production averaged 2,516 Mbd.

Taxes generated during the period amounted to Ps. 208.. billion.

PEMEX recorded an EBITDA of Ps. 265 billion.

Context 2Q13

5

80

85

90

95

100

105

110

115

120

125

3/12 6/12 9/12 12/12 3/13 6/13

Prices of Crude Oil US$/barrel

Avg 2Q13:

96.93 US$/b

Mexican Mix

Brent

Avg 2Q12:

99.97 US$/b

2.20

2.40

2.60

2.80

3.00

3.20

3.40

3/12 6/12 9/12 12/12 3/13 6/13

Prices of Reg Gasoline in the USGM US$/Gal

Avg 2T12:

2.80 US$/Gal

Avg 2T13:

2.69 US$/Gal

12.00

12.50

13.00

13.50

14.00

14.50

3/12 6/12 9/12 12/12 3/13 6/13

Exchange Rate Ps./US$

Jun 30, 2012:

13.6530 Pesos/US$

Jun 30, 2013:

12.9502 Pesos/US$

1.50

2.00

2.50

3.00

3.50

4.00

4.50

3/12 6/12 9/12 12/12 3/13 6/13

Prices of Natural Gas US$/MMBtu

Avg 2Q12:

2.28 US$/MMBtu

Avg 2Q13:

4.01 US$/MMBtu

Content

6

Highlights

Upstream

Downstream

Financial Results

Questions and Answers

Crude Oil Production

7

• During the second

quarter of 2013, crude

oil production averaged

2,516 Mbd.

Mbd

75%

25%

Offshore Onshore

54% 55% 54% 54% 55%

33% 32% 33% 33% 33%

13% 13% 13% 13% 12%

2,545 2,546 2,561 2,544 2,516

2Q12 3Q12 4Q12 1Q13 2Q13

Heavy Light Extra-light

-

300

600

900

1,200

1,500

1,800

2,100

2,400

2,700

1-Jan-13 1-Feb-13 1-Mar-13 1-Apr-13 1-May-13 1-Jun-13

Daily Production

Heavy Light Extra light

Natural Gas Production

8

(1) Does not include nitrogen.

• Natural gas use as a

percentage of

production was

above 98.1%

65% 67% 68% 67% 68%

35% 33% 32% 33% 32%

5,675 5,626 5,664 5,769 5,558

2Q12 3Q12 4Q12 1Q13 2Q13

Natural Gas Production1

MMcfd

Associated Non-Associated

37%

63%

Offshore Onshore

112 97 162

85 108

2.0% 1.7%

2.9%

1.5%

1.9%

2Q12 3Q12 4Q12 1Q13 2Q13

Gas Flaring MMcfd

Gas Flaring (MMcfd)

Gas Flaring / Total GasProduced

Operational Infrastructure

9

157 143 138 132 147

17 19 15 17

21

174 162 153 149

169

2Q12 3Q12 4Q12 1Q13 2Q13

Drilling Equipment Average

Development Exploration

43%

57%

Exploration

Offshore Onshore

30%

70%

Development

Offshore Onshore

6%

94%

Offshore

Onshore

290 318 329 255

184

8 11 15

4

7

2Q12 3Q12 4Q12 1Q13 2Q13

Completion of Wells

Development Exploration

5,933 6,189 6,437 6,632 6,501

3,395 3,463 3,259 3,350 3,314

9,328 9,652 9,696 9,983 9,816

2Q12 3Q12 4Q12 1Q13 2Q13

Wells Average

Crude oil Non-Associated Gas

606

991 1,226

811

1,807

6,063

7,861 6,791

5,310 4,210

-

2,000

4,000

6,000

8,000

10,000

100

600

1,100

1,600

2,100

2Q12 3Q12 4Q12 1Q13 2Q13

Seismic Information

2D (Km) 3D (Km )

Km Km2

2

Third Round of E&P Integrated Contracts

10

A third round of E&P

Integrated Contracts

was carried out on

July, 11, 2013.

Block 3P

Reserves

Date

awarded

Winner

Company

Fee

U.S.$/b

Soledad 134 July 11, 2013 Petrolite de México 0.49

Miquetla 248 July 11, 2013 Operadora de Campos DWF 0.98

Humapa 341 July 11, 2013 Halliburton de México 0.01

Soledad Miquetla Huamapa

Content

11

Highlights

Upstream

Downstream

Financial Results

Questions and Answers

Crude Oil Processing

12

(1) Includes paraffins, furfural extract, aeroflex, asphalt, lubricants, coke, cyclical light oil and other gasolines.

696 699 721 742 786

556 468 464 495 512

2Q12 3Q12 4Q12 1Q13 2Q13

Crude Oil Processing Mbd

Light Crude Heavy Crude

433 404 415 425 462

291 272 257 283 298

312 291 295 303

340

211 208 193 207

206 56

56 57 63

61 91 76 89

92 94

1,394 1,306 1,305

1,373 1,460

2Q12 3Q12 4Q12 1Q13 2Q13

Production of Petroleum Products Mbd

Automotive gasolines Fuel oil Diesel LPG Jet Fuel Other*

In May 2013, PEMEX

achieved the highest

gasoline production

volume in the past

40 months.

1

Natural Gas Processing, Dry Natural Gas and

Gas Liquids Production

13

(1) Includes condensate process.

3,451 3,384 3,284 3,334 3,164

1,056 960 850 1,148 1,089

4,507 4,344 4,134 4,481 4,253

2Q12 3Q12 4Q12 1Q13 2Q13

Processing MMcfd

Sweet Wet Gas

Sour Wet Gas

3,711

3,579

3,494

3,759

3,600

382 373

333

361 354

310

340

370

400

430

460

490

520

3,200

3,400

3,600

3,800

2Q12 3Q12 4Q12 1Q13 2Q13

Mbd

MM

cfd

Production MMcfd

Dry Gas from Plants(MMcfd)

Natural Gas Liquids(Mbd) 1

Production of Petrochemicals

14

(1) Includes muriatic acid, butadiene, polyethylene wax, petrochemical specialities, BTX liquids, hydrogen, isohexane, pyrolysis liquids,

oxygen, CPDI, sulfur, isopropyl alcohol, amorphous gasoline, octane basis gasoline and heavy naphtha.

Mt

45 9 9 9 18

346 345 323 347 343

363 312

253 306 336

1 16

75 83

146 112

116 111 90

110

304 282

257

344

405 1,171

1,080 1,028

1,179

1,358

2Q12 3Q12 4Q12 1Q13 2Q13

Other*

Propylene and Derivatives

Aromatics and Derivatives

Ethane Derivatives

Methane Derivatives

Basic

1

Content

15

Highlights

Upstream

Downstream

Financial Results

Questions and Answers

2Q13 Financial Highlights

16

(1) Excludes IEPS.

(2) Earnings before interests, taxes, depreciation and amortization.

(3) The established exchange rate at June 30, 2013 is of Ps. 13.6530 = U.S.$1.00.

2012 2013

Variation

20123 2013

Billion

Pesos

Billion

Dollars

Total Revenues from Sales

and Services1 406.1 393.2 (3.2%) 29.7 30.4

Gross Income 196.3 208.8 6.4% 14.4 16.1

Operating Income 230.6 197.3 (14.4%) 16.9 15.2

Income before Taxes and

Duties 184.9 159.3 (13.8%) 13.5 12.3

Taxes and Duties 218.5 208.3 (4.7%) 16.0 16.1

Net Income (loss) (33.6) (49.0) (45.9%) (2.4) (3.8)

EBITDA2 289.2 265.0 (8.4%) 21.2 20.5

Second Quarter Second Quarter

Total Sales

Comparison 2Q13 vs. 2Q12

17

Ps. MM

-3.2%

406,066

393,151

18,660 (32,275)

700

2Q12 Domestic Sales Exports ServicesIncome

2Q13

Cost of Sales and General Expenses

Evolution 2Q12 – 2Q13

18

Ps. MM

-8.4%

237,893

218,016

(25,494)

5,617

2Q12 Cost of Sales General Expenses 2Q13

Cost of Sales and General Expenses

Comprehensive Financing Result 2Q13

Composition

19

Ps. MM

(45,524)

(38,155)

7,368

2Q12 Change 2Q13

2,376 (11,892)

(38,155) (28,640)

FinancialIncome

FinancialCost

ExchangeGain (Loss)

ComprehensiveFinancial Result

Exchange Rate

Pesos / U.S. dollar

As of March 31, 2013 12.3546

As of June 30, 2013 12.9502

Taxes and Duties

2Q13 vs. 2Q12

20

Ps. MM

218,507

154,373

64,134

Total Taxes IEPS accrued Payable Taxes

208,314 185,996

22,318

Total Taxes IEPS accrued Payable Taxes

-4.7%

2Q12 2Q13

Net Income Evolution

2Q12 -2Q13

21

(1) Includes profit-sharing in non-consolidated subsidiaries, affiliates and others of Ps. 257.2 million.

Ps. MM

(33,579)

(12,915)

19,877 (39,941)

7,368

10,193

(48,997)

2Q12 TotalSales

Cost of Salesand General

Expenses

OtherRevenues

CFR Taxes andDuties

2Q131

Consolidated Cash Flow

as of June 30, 2013

22

(1) After taxes.

(2) Excludes Financed Public Works Contract Program.

(3) Includes change of cash effect of Ps. 2081.7 million.

Ps. MM

119,235

122,263 38,537

349,138

106,750

47,560 (18,123)

(87,661)

(8,388)

69,103 82,739

Cash at theBeginning of

the Year

Revenuesfrom

Operations

FinancingActivities

AvailableCashflow

DebtPayments

InterestPaid

Investments Taxes Cash at theend of the

Period1 3

2

2

107,640 (130,299)

PMI Revolving lines

Corporate Financing

Consolidated Debt

as of June 30, 2013

23

(1) Excludes Finance Public Works Contracts Program.

(2) Includes accrued interests, fees and charges for debt issuance, loss under par, Finance Public Works Contracts Program and

amortized cost.

Ps. MM Ps. MM

672,618

130

667,616

653,465 667,624

107,640

114,241 92,598

(130,299) (4,115)

(106,750) 786,859 760,214 69,103 (82,739)

Total Debtas of Dec 31,

2012

FinancingActivities

DebtPayments

ExchangeGain

Others Total Debtas of June 30,

2013

Cash & CashEquivalents

Net Debtas of June 30,

2013

Net Debtas of Dec 31,

2012

1

2

-3.4%

0.45

0.49

0.50

0.46

0.47

0.45

0.48

0.46 0.47

as of June 30,2011

as of Sep 30,2011

as of Dec 31,2011

as of March 31,2012

as of June 30,2012

as of Sep 30,2012

as of Dec 31,2012

as of March 31,2012

as of June 30,2013

Debt / Sales

Revolving lines

Non-revolving lines

Short-Term

Long-Term

Highlights 2Q13

24

Total revenues amounted to Ps. 393.2 billion.

Cost of sales decreased by 12.2%.

Total hydrocarbons production averaged 3,644 Mboed.

Crude oil production averaged 2,516 Mbd.

Taxes generated during the period amounted to Ps. 208.3 billion.

PEMEX recorded an EBITDA of Ps. 265 billion.

Content

25

Main Highlights

Upstream

Downstream

Financial Results

Questions and Answers

Investor Relations

(+52 55) 1944 - 9700

ri@pemex.com

@PEMEX_RI