FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of August, 2014

Commission File Number: 001-12102

YPF Sociedad Anónima

(Exact name of registrant as specified in its charter)

Macacha Güemes 515

C1106BKK Buenos Aires, Argentina

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file

annual reports under cover of Form 20-F or Form 40-F:

Form 20-F  x            Form 40-F  ¨

Indicate by check mark if the registrant is submitting the Form 6-K

in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes  ¨            No   x

Indicate by check mark if the registrant is submitting the Form 6-K

in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes  ¨            No   x

YPF Sociedád Anonima

TABLE OF CONTENTS

2

2nd Quarter 2014 Earnings Webcast August 8, 2014

2 Disclaimer 2 Safe harbor statement under the US Private Securities Litigation Reform Act of 1995. This document contains statements that YPF believes constitute forward-looking statements within the meaning of the US Private Securities Litigation Reform Act of 1995.  These forward-looking statements may include statements regarding the intent, belief, plans, current expectations or objectives as of the date hereof of YPF and its management, including statements with respect to trends affecting YPF’s future financial condition, financial, operating, reserve replacement and other ratios, results of operations, business strategy, geographic concentration, business concentration, production and marketed volumes and reserves, as well as YPF’s plans, expectations or objectives with respect to future capital expenditures, investments, expansion and other projects, exploration activities, ownership interests, divestments, cost savings and dividend payout policies. These forward-looking statements may also include assumptions regarding future economic and other conditions, such as the future price of petroleum and petroleum products, refining and marketing margins and exchange rates. These statements are not guarantees of future performance, prices, margins, exchange rates or other events and are subject to material risks, uncertainties, changes in circumstances and other factors that may be beyond YPF’s control or may be difficult to predict. YPF’s actual future financial condition, financial, operating, reserve replacement and other ratios, results of operations, business strategy, geographic concentration, business concentration, production and marketed volumes, reserves, capital expenditures, investments, expansion and other projects, exploration activities, ownership interests, divestments, cost savings and dividend payout policies, as well as actual future economic and other conditions,  such as the future price of petroleum and petroleum products, refining margins and exchange rates, could differ materially from those expressed or implied in any such forward-looking statements. Important factors that could cause such differences include, but are not limited to fluctuations in the price of petroleum and petroleum products, supply and demand levels, currency fluctuations, exploration, drilling and production results, changes in reserves estimates, success in partnering with third parties, loss of market share, industry competition, environmental risks, physical risks, the risks of doing business in developing countries, legislative, tax, legal and regulatory developments, economic and financial market conditions in various countries and regions, political risks, wars and acts of terrorism, natural disasters, project delays or advancements and lack of approvals, as well as those factors described in the filings made by YPF and its affiliates before the Comisión Nacional de Valores in Argentina and with the U.S. Securities and Exchange Commission, in particular, those described  in “Item 3. Key Information—Risk Factors” and “Item 5. Operating and Financial Review and Prospects” in YPF’s Annual Report on Form 20-F for the fiscal  year ended December 31, 2013 filed with the Securities and Exchange Commission. In light of the foregoing, the forward-looking statements included in this document may not occur. Except as required by law, YPF does not undertake to publicly update or revise these forward-looking statements even if experience or future changes make it clear that the projected performance, conditions or events expressed or implied therein will not be realized. These materials do not constitute an offer for sale of YPF S.A. bonds, shares or ADRs in the United States or elsewhere.

Contents Q2 2014 Results Financial Situation Summary 1 2 3 3

Revenues of ARS 35.3 bn (+61% vs. Q2 2013) Crude oil production 240.9 Kbbl/d (+5.6%) Natural gas production 43.5 Mm3/d (+31.8%) Crude processed 292 Kbbl/d (+20%) Operating Income was ARS 6 bn (+168%) Net Income was ARS 1.5 bn (+40%) Total Capex was ARS 10.9 bn (+67%) Q2 2014 Results Highlights Adj. EBITDA (1) reached ARS 10.5 bn (+82%) Operating Cash Flow topped 11.4bn (+251%) (1) See description of Adj. EBITDA in footnote (2) on page 5 Solid demand, market share: Gasoline 59% and diesel 58% 4

5 Production and Sales volumes growth at higher margins, resulted in solid y-o-y financial performance. Revenues (1) (MUSD) Operating Income (1) (3) (MUSD) Adj. EBITDA (1) (2)  (MUSD) (1) YPF financial statement values in IFRS converted to USD using average FX of 5.2 and 8 for Q2 2013 and Q2 2014, respectively. (2) Adjusted EBITDA = Net income attributable to shareholders + Net income (loss) for non-controlling interest - Deferred income tax - Income tax - Financial income (losses) gains on liabilities - Financial income gains (losses) on assets - Income on investments in companies + Depreciation of fixed assets + Amortization of intangible assets. (3) In Q2 2013 results do not include the impact of non cash provision relating to claims arising from the discontinuation of gas export contracts to Brazil in 2009. +5% +75% +42% Q2 2014 Results Expressed in US Dollars 920 1,307 Q2 2013 Q2 2014 425 743 Q2 2013 Q2 2014 4,203 4,413 Q2 2013 Q2 2014

6 In millions of ARS Q2 2014 Operating Income Operating Income increased by 168% in Q2 2014 driven mainly by higher revenues. (1) Does not include the impact of non cash provision relating to claims arising from the discontinuation of gas export contracts to Brazil in 2009. 2,218 5,950 13,389 477 -5,656 -1,881 -1,317 -723 -557 Q2 2013 Revenues Others expenses Other costs of sales DD&A Purchases SG&A Exploration expenses Q2 2014 (1)

7 Q2 2014 Operating Income Solid performance across both business segments. In millions of ARS (1) Does not include the impact of non cash provision relating to claims arising from the discontinuation of gas export contracts to Brazil in 2009. 2,218 5,950 1,862 1,711 159 Q2 2013 Upstream Downstream Others Q2 2014 (1)

8 Q2 2014 Upstream Results Upstream Operating Income reached ARS 3.3 bn (+129%) due to higher revenues driven by the increase in production of both crude oil and natural gas and by higher prices in pesos. In millions of ARS (1) Does not include the impact of non cash provision relating to claims arising from the discontinuation of gas export contracts to Brazil in 2009. (2) Includes inventory variation and purchases of -131 MARS and SG&A of 472 MARS. (2) 1,443 3,305 5,970 341 191 -2,035 -1,296 -752 -557 Q2 2013 Revenues Other expenses Afiliates Production costs DD&A Royalties Exploration Expenses Q2 2014 (1)

9 Crude oil production (1) (Kbbl/d) Natural gas production (1) (Mm 3 /d) Q2 2014 Upstream Results – Production Total production (1) (Kboe/d) +5.6% +31.8% +15.5% Total y-o-y production growth of 15.5%, 5.6% in crude oil and 31.8% in natural gas. (1) Q2 2014 includes production of YSUR and Puesto Hernández acquired in Q1 2014. 228.2 240.9 Q2 2013 Q2 2014 33.0 43.5 Q2 2013 Q2 2014 481.4 555.8 Q2 2013 Q2 2014

10 Q2 2014 Upstream Results – Production Crude oil production (kbbl/d) Natural gas production (Mm 3 /d) Solid conventional y-o-y natural gas production increase of 4.4%, coupled with inorganic growth and continued shale and tight progress. YSUR + Puesto Hernández Tight + Shale Conventional 226.3 228.2 235.1 239.3 241.6 240.9 31.4 33.0 35.6 35.5 37.2 43.5 222.1 222.8 227.2 229.9 229.2 220.5 6.0 13.6 4.2 5.4 7.9 9.5 6.4 6.8 Q1 13 Q2 13 Q3 13 Q4 13 Q1 14 Q2 14 30.7 32.3 34.7 33.2 32.9 33.7 1.3 6.0 0.7 0.7 0.9 2.3 3.1 3.8 Q1 13 Q2 13 Q3 13 Q4 13 Q1 14 Q2 14

Confirming Well Productivity Vaca Muerta – Vertical Well Production Loma Campana - Sweet Spots Vaca Muerta Figures • > 2 bn USD invested • > 200 development wells drilled • 21 drilling rigs in LC • 40 exploration wells outside LC Total Gross Production (Kboe/d) 50,000 45,000 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 H V 5.9 7.9 9.8 13.3 17.3 18.6 23.2 Q4 12 Q1 13 Q2 13 Q3 13 Q4 13 Q1 14 Q2 14 0 1 2 3 4 5 6 7 8 9 10 11 12 2011: 15 wells 2012: 10 wells 2013: 93 wells Type well curve Avrg well West Sweet Spot: 15 wells 2014 Sweet Spot: 24 wells

Q2 2014 Downstream Results Downstream Operating Income grew 141% in Q2 2014, due to higher revenues in the domestic market. In millions of ARS 1,210 2,921 11,044 177 -7,839 -1,084 -392 -195 Q2 2013 Revenues Affiliates Purchases Production costs SG&A DD&A Q2 2014 12

13 20% Crude processed (kbbl/d) Domestic sales of refined products +7% Q2 2014 Downstream Results - Sales +6% -0.7% Refinery output restored after La Plata Refinery incident in Q2 2013. +198% 243 292 Q2 2013 Q2 2014 3,819 4,087 Q2 2013 Q2 2014 Others LPG Fuel Oil JP1 Gasoline Diesel (Km  ) 3

14 Q2 2014 Refined Products Demand Diesel volumes (1) (Jan-13 base = 100) Strong YPF performance in a challenging domestic market. Gasoline volumes (1) (Jan-13 base = 100) (1) Source: Argentine Secretariat of Energy (SEN) YPF Rest of the market YPF Rest of the market

15 Q2 2014 Capex (1) (1) Economic capex figures as expressed in Note 2.g of Q2 2014 YPF financial statements. (2) Active rigs at end of period. +66.9% In millions of ARS 10,866 Downstream Upstream Progress of the new coke unit at the La Plata Refinery and other multi-year projects Neuquina basin: Loma La Lata, Loma Campana, Rincón del Mangrullo and Aguada Toledo Golfo San Jorge basin: Manantiales Behr, El Trébol, Barranca Baya and Los Perales Drilling rigs (2) +192% Q2 2013 Q2 2014 Upstream Downstream Others 6,510 25 36 42 46 52 58 63 65 69 73 Q1 12Q2 12Q3 12Q4 12Q1 13Q2 13Q3 13Q4 13Q1 14Q2 14

Contents Q1 2014 Results Financial Situation Summary 1 2 3 16

In millions of ARS (1) Includes effect of changes in exchange rates. (2) Effective spendings in fixed asset acquisitions during the quarter . (3) Net debt to Adj.EBITDA calculated in USD, Net debt at period end FX of 8.1 and Adj. EBITDA LTM at 6.8; 4,298 / 4,813 = 0.89. Q2 2014 Cash Flow From Operations Cash flow from operations grew ARS 8 bn against Q2 2013. Sound capital structure (Net Debt / Adj. EBITDA LTM of 0.9x) (3) . (1) (2) +251% 3,109 11,448 11,430 6,041 -9,132 Cash at the beginning of Q2 2014 Cashflow from operations Net financing Capex Cash at the end of Q2 2014 3,253 6,715 11,430 Q2 2013 Q1 2014 Q2 2014 17

18 (1) Converted to USD using average FX of: Q2 2012= 4.3, Q3 2012= 4.6, Q4 2012= 4.8, 5, Q1 2013= 5.2, Q2 2013= 5.6, Q4 2013= 6, Q12014=7.6 and Q2 2014= 8. (2) Adj. EBITDA margin is Adj. EBITDA divided by Consolidated Revenues. (3) Operating margin is Operating Income divided by Consolidated Revenues. Q2 2014 Margin Evolution Healthy recovery based on production increase and pricing discipline. Adj. EBITDA and Adj. EBITDA margin (1) (2) (MUSD - %) Operating Income and Operating margin (1) (3) (MUSD - %) 886 865 850 948 920 1,182 1,212 1,101 1,307 23.8% 22.9% 21.5% 25.4% 21.9% 27.1% 28.9% 27.3% 29.6% Q2 2012 Q3 2012 Q4 2012 Q1 2013 Q2 2013 Q3 2013 Q4 2013 Q1 2014 Q2 2014 433 368 386 507 425 619 632 578 743 11.6% 9.7% 9.8% 13.6% 10.1% 14.2% 15.1% 14.3% 16.8% Q2 2012 Q3 2012 Q4 2012 Q1 2013 Q2 2013 Q3 2013 Q4 2013 Q1 2014 Q2 2014

19 Peso denominated debt 32% Financial debt amortization schedule (1) (2) (MUSD) Average interest rates  of 28.04% in USD and 6.76% in ARS (1) As of June 30, 2014    /   (2) Converted to USD using June 30, 2014 FX of 8.1 Cash position covers next 18-month debt maturities. Continued to extend average life of debt. Financial Situation Update Average life of almost 4 years 1,415 Cash 2014 (Jul-Dec) 2015 2016 2017 2018 2019 2020+ Trade facilities Term Loans Senior Bonds and Notes 8% 13% 79% 1

Contents Q1 2014 Results Financial Situation Summary 1 2 3 20

Summary Continued to increase results and expand margins despite currency devaluation Increased oil & gas production by 15.5% as a result of a balanced mix of conventional and unconventional production coupled with inorganic growth Strong operating cash flow allowed continued increase in capex without increasing leverage Solid capital structure with significant cash reserves provides stability regardless of the sovereign situation 21

2 nd Quarter 2014 Earnings Webcast Questions and Answers

2nd Quarter 2014 Earnings Webcast August 8, 2014

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.