Index

Participating in the Savings Plan

Savings Plan Account

Your Contributions and the Company Match

Investment Options

Investment Considerations

Implementing Investment Decisions

Changing How Your Money Is Invested

Accessing Your Money

Loans

Withdrawals

Distributions

Information for Participants Who Worked for Mobil Corporation

Information for Participants Who Worked for Paxon or AES

Tax Considerations

Administrative and ERISA Information

Securities and Exchange Commission (SEC) Information

Key Terms

Savings Plan Account Features

ExxonMobil Savings Plan SPD and Prospectus
May 1, 2008

About the Savings Plan

This SPD is the summary plan description and prospectus for the ExxonMobil Savings Plan. It does not contain all the details. Use of the phrase "Savings Plan" throughout this document refers collectively to the Savings Plan and its implementing Savings Trust, except as otherwise noted. This SPD supersedes all previous Savings Plan participant publications. In determining specific benefits, the full Savings Plan provisions, as they exist now or in the future, always govern. Copies of Savings Plan documents are available for your review. The company reserves the right at any time to change in any way or terminate any benefit.

THIS SPD CONSTITUTES PART OF A PROSPECTUS COVERING SECURITIES THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, INCLUDING SHARES OF EXXON MOBIL CORPORATION COMMON STOCK ("EXXONMOBIL STOCK").

Applicability to represented employees is governed by collective bargaining agreements and any local bargaining requirements.

Information Sources

When you need account information or want to make an account transaction, you have two options that are generally available 24 hours a day, 7 days a week.

• The Savings Plan Internet Site ("Web site") is located at http://xomsavings.ingplans.com.
• The toll free telephone number for the Savings Telephone Service (STS) is 877-XOM-401K (966-4015). Non-U.S. residents call 617-847-1033.

In addition, Customer Service Representatives are available for inquiries and transactions via the STS Monday through Friday, 7:00 a.m. to 6:00 p.m. Central time, excluding New York Stock Exchange holidays.

page 2

ExxonMobil Sponsored Sites — Access to plan-related information for employees, retirees, and their family members is also available on the following web sites:

• ExxonMobil Me, the Human Resources Intranet site – Can be accessed by current employees.
• Retiree Online Community Internet Site – Can be accessed from home by ExxonMobil retirees and survivors only (including Exxon and Mobil retirees and survivors) at www.emretiree.com.
• ExxonMobil Family – Can be accessed at www.exxonmobilfamily.com.

Introduction

The company* sponsors the ExxonMobil Savings Plan to encourage long-term savings and help participants ensure their financial security in retirement.

The ExxonMobil Savings Plan contains many features described in detail in this SPD. Keep this SPD for future reference to help you find specific information quickly and easily and make the most of the features available to you. The SPD includes these helpful tools:

• Plan at a Glance is a quick user's guide highlighting plan basics.
• Charts and tables throughout the SPD provide information and highlights of plan provisions, including an Account Features chart on pages 68-69.
• Key Terms contains definitions of many words and terms used in this SPD. If you see a term that is unfamiliar, refer to this section at the end of the SPD.
• An Index helps you locate specific items found throughout the SPD.

*References in this SPD to "the company" refer to Exxon Mobil Corporation and/or a participating affiliate, as the case may be.

Plan at a Glance

Participating in the Savings Plan
Because there is no service requirement for regular employees, you are eligible to participate as soon as you join the company. See page 4.

Your Contributions and the Company Match
You can save from 6% to 20% of your pay on a before-tax basis, an after-tax basis or a combination of both. You receive a company match of 7% of pay on the first 6% of pay you contribute via payroll deduction.

Investment Options
You have a choice of seven investments with varying investment objectives and degrees of risk in which to invest your Savings Plan account. See page 14.

Investment Considerations
It is important that you read this section before making your investment decisions. See page 21.

Accessing Your Money
You may receive a dividend payment in cash for dividends on ExxonMobil stock. You may borrow from the Savings Plan while you are still employed. In certain circumstances, you may withdraw money from your account. You (or your beneficiary) are eligible to receive a distribution from the Savings Plan upon your retirement, death or termination of employment. See page 29.

Information for Participants Who Worked for Mobil Corporation
This section addresses certain grandfathered features that apply to any remaining Mobil portion of your current account balance. Information found here is intended to supplement or supersede information found in other sections. See page 40.

Information for Participants Who Worked for Paxon or AES
This section addresses certain grandfathered features that apply to any remaining Paxon or AES portion of your current account balance. Information found here is intended to supplement or supersede information found in other sections. See page 44.

Tax Considerations
Your Savings Plan account contains two distinct amounts:

• the amount on which you have already paid tax; and
• the amount on which no tax has been paid.

The tax rules are complex – it is important to seek advice from a tax professional before making a withdrawal, deferral or distribution decision. See page 47.

Administrative and ERISA Information
The Savings Plan is subject to rules of the federal government, including the Employee Retirement Income Security Act (ERISA). See page 53.

Key Terms and Index
The Key Terms section contains an alphabetized list of key words and phrases, with their definitions, used in this SPD. See page 62.
You can use the index to locate specific topics described in this SPD. See page 70.

The Savings Plan Web site at http://xomsavings.ingplans.com and the Savings Telephone Service (STS) at 877-966-4015 are available for account information and transactions.