EXHIBIT 99.1

EXXON MOBIL CORPORATION ANNOUNCES ESTIMATED

FIRST QUARTER 2013 RESULTS

EXXONMOBIL'S CHAIRMAN REX W. TILLERSON COMMENTED:

“ExxonMobil achieved strong results during the first quarter of 2013, while investing significantly to develop new energy supplies.  ExxonMobil’s financial performance enables continued investment to deliver the energy needed to help meet growing demand, support economic growth, and raise living standards around the world.

First quarter 2013 earnings were $9.5 billion, up 1% from the first quarter of 2012.

Capital and exploration expenditures for the first quarter were $11.8 billion, including $3.1 billion for the acquisition of Celtic Exploration Ltd.  

The Corporation distributed $7.6 billion to shareholders in the first quarter through dividends and share purchases to reduce shares outstanding.”

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First Quarter 2013 vs. First Quarter 2012

Upstream earnings were $7,037 million in the first quarter of 2013, down $765 million from the first quarter of 2012.  Lower liquids realizations, partially offset by improved natural gas realizations, decreased earnings by $230 million.  Production volume and mix effects reduced earnings by $280 million.  All other items, including higher operating expenses, decreased earnings by $250 million.

On an oil-equivalent basis, production decreased 3.5% from the first quarter of 2012. Excluding the impacts of entitlement volumes, OPEC quota effects and divestments, production decreased 1.2%.

Liquids production totaled 2,193 kbd (thousands of barrels per day), down 21 kbd from the first quarter of 2012 as field decline was partially offset by project ramp-up in West Africa.  The net impact of entitlement volumes, OPEC quota effects, and divestments was negligible.

First quarter natural gas production was 13,213 mcfd (millions of cubic feet per day), down 823 mcfd from 2012.  Excluding the impacts of entitlement volumes and divestments, natural gas production was down 1.5%, as field decline was partially offset by lower downtime and higher demand.

Earnings from U.S. Upstream operations were $859 million, $151 million lower than the first quarter of 2012.  Non-U.S. Upstream earnings were $6,178 million, down $614 million from the prior year.

Downstream earnings were $1,545 million, down $41 million from the first quarter of 2012.  Stronger margins, mainly in refining, increased earnings by $780 million.  Volume and mix effects decreased earnings by $290 million.  All other items, including lower gains on asset sales, higher expenses, and foreign exchange effects, decreased earnings by $530 million.  Petroleum product sales of 5,755 kbd were 561 kbd lower than last year's first quarter reflecting the Japan restructuring and other divestment related impacts.

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Earnings from the U.S. Downstream were $1,039 million, up $436 million from the first quarter of 2012.  Non-U.S. Downstream earnings of $506 million were $477 million lower than last year.  

Chemical earnings of $1,137 million were $436 million higher than the first quarter of 2012.  Higher margins, mainly commodities, increased earnings by $320 million.  All other items, including gains on asset sales, increased earnings by $120 million.  First quarter prime product sales of 5,910 kt (thousands of metric tons) were 427 kt lower than last year's first quarter due mainly to the Japan restructuring.

Corporate and financing expenses were $219 million for the first quarter of 2013, down $420 million from the first quarter of 2012, reflecting favorable tax impacts.

During the first quarter of 2013, Exxon Mobil Corporation purchased 63 million shares of its common stock for the treasury at a gross cost of $5.6 billion.  These purchases included $5 billion to reduce the number of shares outstanding, with the balance used to acquire shares in conjunction with the company’s benefit plans and programs.  Share purchases to reduce shares outstanding are currently anticipated to equal $4 billion in the second quarter of 2013.  Purchases may be made in both the open market and through negotiated transactions, and may be increased, decreased or discontinued at any time without prior notice.

Estimates of key financial and operating data follow.  

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ExxonMobil will discuss financial and operating results and other matters on a webcast at 10 a.m. Central time on April 25, 2013.  To listen to the event live or in archive, go to our website at exxonmobil.com.

Cautionary statement

Statements relating to future plans, projections, events or conditions are forward-looking statements.  Actual results, including project plans, costs, timing, and capacities; capital and exploration expenditures; resource recoveries; and share purchase levels, could differ materially due to factors including: changes in oil or gas prices or other market or economic conditions affecting the oil and gas industry, including the scope and duration of economic recessions; the outcome of exploration and development efforts; changes in law or government regulation, including tax and environmental requirements; the outcome of commercial negotiations; changes in technical or operating conditions; and other factors discussed under the heading "Factors Affecting Future Results" in the “Investors” section of our website and in Item 1A of ExxonMobil's 2012 Form 10-K.  We assume no duty to update these statements as of any future date.  

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Frequently used terms

This press release includes cash flow from operations and asset sales, which is a non-GAAP financial measure.  Because of the regular nature of our asset management and divestment program, we believe it is useful for investors to consider proceeds associated with the sales of subsidiaries, property, plant and equipment, and sales and returns of investments together with cash provided by operating activities when evaluating cash available for investment in the business and financing activities.  A reconciliation to net cash provided by operating activities is shown in Attachment II.  Further information on ExxonMobil's frequently used financial and operating measures and other terms is contained under the heading "Frequently Used Terms" available through the “Investors” section of our website at exxonmobil.com.

Reference to Earnings

References to corporate earnings mean net income attributable to ExxonMobil (U.S. GAAP) from the consolidated income statement.  Unless otherwise indicated, references to earnings, Upstream, Downstream, Chemical and Corporate and Financing segment earnings, and earnings per share are ExxonMobil's share after excluding amounts attributable to noncontrolling interests.

The term “project” as used in this release does not necessarily have the same meaning as under SEC Rule 13q-1 relating to government payment reporting.  For example, a single project for purposes of the rule may encompass numerous properties, agreements, investments, developments, phases, work efforts, activities, and components, each of which we may also informally describe as a “project”.

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