Filed by Anadarko Petroleum Corporation

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: Anadarko Petroleum Corporation

Commission File No.: 001-08968

Anadarko Petroleum Corporation (“Anadarko” or “APC”) posted the following communication relating to its pending merger transaction with Chevron Corporation (“Chevron”) to Anadarko’s intranet site available to its employees on April 22, 2019.

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We recognize there is a significant amount of uncertainty and anxiety associated with Chevron’s agreement to acquire Anadarko and what that will mean for each of you. Although we do not have the information to fully address all of your questions and concerns immediately, we will be as transparent as possible throughout this time. In order to ensure you are receiving the most up-to-date and accurate answers, each response is reviewed by both Anadarko and Chevron leadership. We appreciate your patience as we work through this process.

We have developed these Frequently Asked Questions (FAQs) to provide relevant information as it becomes available. Additional FAQs will be added to this document weekly or twice per week depending on the flow of information, and the latest updates will also be available on the homepage and the Chevron Acquisition pages of Insider.

If you have questions not answered below, please submit them to APC Communications, and we will do our best to address them in a timely fashion.

As a reminder, our Employee Assistance Program (EAP) is available for confidential counseling at no cost to you. Thank you for your patience during this process.

Acquisition Process

This transaction does not require that Chevron hold a shareholder vote. Anadarko will hold a special meeting for its vote of stockholders that will be determined at a future date. Once the meeting date has been determined, it will be made public in a similar fashion to how we communicate details about our annual meeting.

In light of the pending merger, Anadarko has indefinitely postponed its 2019 annual meeting of stockholders, which had previously been scheduled for May 14, 2019.

The completion of the transaction is subject to satisfaction or waiver of certain customary mutual closing conditions, including:

We will continue to evaluate the most effective way to communicate critical information, using a combination of email, Insider, APC Go, group meetings and/or town halls.

Closing is subject to customary regulatory approvals and the approval of Anadarko shareholders. Chevron and Anadarko can each cancel the agreement under very limited circumstances that are outlined in the Merger Agreement.

Although we cannot speculate on the likelihood of alternative scenarios, there is a procedure included in the Merger Agreement if any other company wants to make an alternative proposal to acquire the company.

There is no guarantee that shareholders will receive $65 per share – the amount received could be higher or lower at closing. When the transaction closes, each shareholder will receive $16.25 in cash and 0.3869 shares of Chevron stock for each share of Anadarko stock they hold. This consideration was worth $65 per share based on the Chevron closing price on the day before the transaction was announced. The value of the Chevron share component on the closing date will be a function of the Chevron share price on such date.

As expressed during the town hall, the EC unanimously agreed the offer was the right thing for the company and its shareholders. Similarly the board also approved the transaction unanimously.

Other Acquisition Questions

At this time, please continue to conduct business as usual. If you receive questions from the audience or others regarding the transaction, please refer the person to Chevron.

You will need to discuss this with your management and Human Resources, as the business will need to determine the continued need for the position. When a retirement notice is given, a business has to start planning for a replacement, so it is possible that commitments have been made regarding the position. Separately, you will want to ensure you understand the implications of remaining with Anadarko through the transfer of ownership.

Because Chevron is interested in the talented people in our company, you may want to update your Talent Navigator Profile in order to best represent your experience and skills. We also encourage you to talk with your colleagues, your manager and/or HR over the coming months to keep informed as we progress through this process.

The integration team will strive to communicate information regularly and as openly as possible as talent and integration needs are assessed and determined.

We have already implemented technical competencies with our engineering population and have completed 90% of the assessments, which now allows us to focus attention on development items such as formal classroom and on-the-job training for our engineers. We are in the final stage of our Operations Competency Assurance project and will continue with the implementation this year. In light of the pending acquisition, we will stop any additional discipline competency development.

Chevron uses a variety of assessments, Equliibria’s E-Colors program is the most common within the organization.

Chevron has made it clear that retaining a talented and skilled workforce is a priority. Efforts to assess talent needs and synergies within the combined company will be undertaken, with a focus on establishing an integrated organization that is ready to safely and effectively manage the assets and opportunities of the combined company in each asset area.

Anadarko will honor all offers that have already been accepted, including college new hires and this summer’s interns. HR is working on a consistent communication that will be sent to grads and interns in the coming week. If a graduate or intern reaches out to you, you can share the same information that employees have heard and advise them that they will also be reached shortly by University Relations.

Anadarko will honor all offers that have already been accepted. We continue to need to operate our business and need talented people to do so. Candidates can be informed of information that is already public.

You can contact your HR Business Partner at any time to talk through your employee profile on Talent Navigator and/or your resume. Should you not transition into the combined company and receive severance, outplacement services will be provided which will include resume preparation.

There are no special restrictions on trading Anadarko securities related to the transaction. As always, under Anadarko’s Insider Trading Policy, if you have material nonpublic information concerning Anadarko, including information related to quarterly results, neither you nor members of your family may buy or sell securities of Anadarko, including transfers in or out of the APC Stock Fund in the Employee Savings Plan. Prior to trading Anadarko securities you must first check with your supervisor to ensure that you are not in possession of any

material, nonpublic information. If any doubts exist as to whether information is material or has been released to the public, you should contact Anne Bruner in the Legal Department. In addition, members of Anadarko’s management must first consult the General Counsel or Deputy General Counsel and Corporate Secretary before buying or selling Anadarko securities.

Transition and Integration

The CVX Synergy box is a Chevron-only function that will track synergies in order to meet Chevron’s external commitments about transaction synergy. Accordingly, there is no Anadarko role in this function. We included it in our announcement in the interest of transparency so that employees from both companies are seeing the same thing.

The integration planning process will take a significant amount of time given the size and complexities of both organizations. Information flow will not be quick, and it is unlikely that many details will be available prior to closing the transaction. As information becomes available, we will share it with you.

These details will be determined as part of the integration planning process, which is now kicking off.

As communicated in the initial news release, Chevron is acquiring Anadarko.

We are making every effort to keep the flow of communication moving. This will include a range of mediums from field visits to emails, APC Go posts, updates on Insider and the recent town hall. As an example, Danny Brown has already visited a number of locations including Midland, Kermit, Denver and Platteville.

It is essential that we operate as a separate company until closing. Projects underway should continue, although they may later be postponed or modified based on decisions that emerge from the integration planning team. Interactions with Chevron should be the same as they would for normal course of business. If you have coordinated projects with Chevron already, you should continue as you would normally.

Chevron has indicated that it is committed to retaining a talented and skilled workforce. Efforts to assess talent needs and synergies within the combined company will be undertaken, with a focus on establishing an integrated organization that is ready to safely and effectively manage the combined company. It is too early to speculate on how specific areas will be affected.

Assets

Anadarko’s 2019 capital program has not changed. As we will operate as a separate business through closing, we should continue to fund our capital projects consistent with the current 2019 program.

No. Until closing, Anadarko must operate as a separate company from Chevron. This means we should continue to execute upon our 2019 capital program and advance projects as we would in the normal course of business.

It’s too early to know this information, though as you have heard Mike Wirth comment, Western Midstream is strategically important to why Chevron was interested in Anadarko.

Chevron has made it clear that retaining a talented and skilled workforce is a priority. Efforts to assess talent needs and synergies within the combined company will be undertaken, with a focus on establishing an integrated organization that is ready to safely and effectively manage the assets and opportunities of the combined company in each asset area.

Anadarko’s 2019 capital program remains unchanged. Until closing, we must act as a separate company and continue to safely execute upon the previously communicated capital program and objectives in the Delaware Basin and elsewhere.

It‘s too early to comment on Gulf of Mexico field- or platform-level specifics.

As Chevron’s CEO stated on the company’s investor call on April 12, 2019, Chevron’s and Anadarko’s Gulf of Mexico positions are highly complementary. Both companies have been leaders in the deepwater Gulf of Mexico for years, and this acquisition increases Chevron’s operated platform count nearly threefold from 6 to 16. This deal brings together the third- and fourth-largest producers in the Gulf. This extensive infrastructure, combined with advances in subsea technology, is expected to further enable even more capital-efficient tie-back opportunities, driving strong cash margins and higher project returns.

We remain positioned to take FID in the first half of 2019. This transaction does not affect that objective.

It’s too early to know this information.

Yes, the Midland reorganization and business process changes based on the work done by Midland staff (ADAD and ADPEP teams) will continue through to implementation as both efforts will position Anadarko and the combined company well to take advantage of the opportunities we have in the Delaware Basin.

Yes. Employees who chose to relocate to Houston as part of the Midland reorganization will be able to continue to do so. If the employee wishes to reconsider his/her decision, they should raise this with their manager and HR as soon as possible.

Until closing, Anadarko must operate as a separate company from Chevron. In that regard, the best approach for you to better understand Chevron, which is a good idea for all of us, is to view the information publicly available on their website.

Offices and Locations

We’re continuing construction on Anadarko’s new campus in Midland. It is too early to know how Chevron will approach the Midland location.

The closing of the Côte D’Ivoire office will continue as planned.

It is too early to know this information.

It’s too early to know most of this information; however, we do anticipate moving forward with the previously planned renovations of the Denver office.

It is too early to know this information.

Important Information For Investors And Stockholders

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of

1933, as amended. In connection with the potential transaction, Chevron expects to file a registration statement on Form S-4 with the Securities and Exchange Commission (“SEC”) containing a preliminary prospectus of Chevron that also constitutes a preliminary proxy statement of Anadarko. After the registration statement is declared effective Anadarko will mail a definitive proxy statement/prospectus to stockholders of Anadarko. This communication is not a substitute for the proxy statement/prospectus or registration statement or for any other document that Chevron or Anadarko may file with the SEC and send to Anadarko’s stockholders in connection with the potential transaction. INVESTORS AND SECURITY HOLDERS OF CHEVRON AND ANADARKO ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders will be able to obtain free copies of the proxy statement/prospectus (when available) and other documents filed with the SEC by Chevron or Anadarko through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Chevron will be available free of charge on Chevron’s website at http://www.chevron.com/investors and copies of the documents filed with the SEC by Anadarko will be available free of charge on Anadarko’s website at http://investors.anadarko.com.

Chevron and Anadarko and certain of their respective directors, certain of their respective executive officers and other members of management and employees may be considered participants in the solicitation of proxies with respect to the potential transaction under the rules of the SEC. Information about the directors and executive officers of Chevron is set forth in its Annual Report on Form 10-K for the year ended December 31, 2018, which was filed with the SEC on February 22, 2019, and its proxy statement for its 2019 annual meeting of stockholders, which was filed with the SEC on April 15, 2019. Information about the directors and executive officers of Anadarko is set forth in its Annual Report on Form 10-K for the year ended December 31, 2018, which was filed with the SEC on February 14, 2019, and its proxy statement for its 2019 annual meeting of stockholders, which was filed with the SEC on March 29, 2019. These documents can be obtained free of charge from the sources indicated above. Additional information regarding the interests of such participants in the solicitation of proxies in respect of the potential transaction will be included in the registration statement and proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available.

Cautionary Statement Regarding Forward-Looking Information

This report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Anadarko believes that its expectations are based on reasonable assumptions. No assurance, however, can be given that such expectations will prove to have been correct. A number of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this news release, including regarding the proposed transaction. These include the timing, receipt and terms and conditions of any required governmental and regulatory approvals of the

proposed transaction that could reduce anticipated benefits or cause the parties to abandon the proposed transaction, the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement, the possibility that stockholders of Anadarko may not adopt the merger agreement, the risk that the parties may not be able to satisfy the conditions to the proposed transaction in a timely manner or at all, risks related to disruption of management time from ongoing business operations due to the proposed transaction, the risk that any announcements relating to the proposed transaction could have adverse effects on the market price of Anadarko’s common stock or Chevron’s common stock, the risk of any unexpected costs or expenses resulting from the proposed transaction, the risk of any litigation relating to the proposed transaction, the risk that the proposed transaction and its announcement could have an adverse effect on the ability of Anadarko or Chevron to retain customers and retain and hire key personnel and maintain relationships with their suppliers, customers and other business relationships and on their operating results and businesses generally, the risk the pending proposed transaction could distract management of both entities and they will incur substantial costs, the risk that problems may arise in successfully integrating the businesses of the companies, which may result in the combined company not operating as effectively and efficiently as expected, the risk that the combined company may be unable to achieve synergies or other anticipated benefits of the proposed transaction or it may take longer than expected to achieve those synergies or benefits and other important factors that could cause actual results to differ materially from those projected. All such factors are difficult to predict and are beyond Anadarko’s control. Additional factors that could cause results to differ materially from those described above can be found in Anadarko’s most recent Annual Report on Form 10-K, as it may be updated from time to time by quarterly reports on Form 10-Q and current reports on Form 8-K all of which are available on Anadarko’s website at http://investors.anadarko.com/sec-filings and on the SEC’s website at http://www.sec.gov, and in Chevron’s most recent Annual Report on Form 10-K, as it may be updated from time to time by quarterly reports on Form 10-Q and current reports on Form 8-K all of which are available on Chevron’s website at https://www.chevron.com/investors/financial-information#secfilings and on the SEC’s website at http://www.sec.gov.