Form 425 IHS Inc. Filed by: IHS Inc.

Filed by IHS Inc.

Pursuant to Rule 425 of the Securities Act of 1933, as amended, and

deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934, as amended

Subject Company: IHS Inc.

(Commission File No. 001-32511)

Dear Colleagues:

As part of our commitment to keep you updated on key milestones related to our merger of equals with Markit, I’m pleased to announce the following important developments:

In the past few weeks, we have reached two important milestones. First, we received all regulatory approvals required for our merger to be completed. Second, we filed the registration statement (Form F-4) related to the merger with the U.S. Securities and Exchange Commission (SEC). The F-4 required a huge effort and collaboration across the finance and legal teams from both IHS and Markit and is the first step in preparing for our shareholder vote relating to the merger. The initial filing, which can be found here, will be updated in the coming weeks. Once effective, it will be distributed to shareholders of both companies to provide them with important information to consider for the vote on the merger.

Additionally, after an extensive review process, IHS and Markit together have selected The Boston Consulting Group (BCG), a global management consulting firm, to work with us on merger integration planning and execution. BCG will help benchmark our processes against best practices and provide an objective assessment of decisions that need to be made.

In the next few weeks, we will kick off the work with BCG. As part of the merger planning a steering committee, internal workstreams and working groups will be established across IHS and Markit. Working with BCG, the steering committee will set the strategic direction and priorities of the integration and also will analyze and validate the synergies and cross-selling opportunities. We will update you on who will be leading these efforts when the roles have been assigned.

Lance and I have spent a considerable amount of time together over the past ten days and we are making great progress on merger planning. We have not yet concluded our decisions regarding organizational structure and our leadership team, but we will be sure to share those details with you once they are complete.

These are exciting next steps in the merger planning process and I look forward to providing more information soon. In the meantime, please stay as focused as ever on achieving our 2016 objectives and on delighting our customers.

Together, we will be the very best!

Your coach and CEO,

Jerre Stead

Where You Can Find Additional Information

In connection with the proposed transaction, on May 10, 2016 Markit filed with the Securities and Exchange Commission (the “SEC”) a preliminary registration statement on Form F-4 that includes a joint proxy statement of IHS and Markit. These materials are not final and may be amended. IHS and Markit may also file other documents with the SEC regarding the proposed transaction. This document is not a substitute for the joint proxy statement/prospectus or definitive registration statement or any other document which IHS or Markit may file with the SEC. INVESTORS AND SECURITY HOLDERS OF IHS AND MARKIT ARE URGED TO READ THE PRELIMINARY REGISTRATION STATEMENT, THE JOINT PROXY STATEMENT/PROSPECTUS AND THE DEFINITIVE VERSIONS THEREOF AND ANY OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION AND RELATED MATTERS. Investors and security holders may obtain free copies of the preliminary materials filed on May 10, 2016 and the definitive versions of these materials and other documents filed with the SEC (when available) by IHS and Markit

through the web site maintained by the SEC at www.sec.gov or by contacting the investor relations department of IHS and Markit at the following:

Participants in the Solicitation

IHS, Markit, and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information regarding IHS’s directors and executive officers, and their direct or indirect interests in the transaction, by security holdings or otherwise, is contained in IHS’s Form 10-K for the year ended November 30, 2015 and its proxy statement filed on February 24, 2016, which are filed with the SEC. Information regarding the directors and executive officers of Markit, and their direct or indirect interests in the transaction, by security holdings or otherwise, is contained in Markit’s 20-F for the year ended December 31, 2015, and Markit’s proxy statement filed on Form 6-K on March 27, 2015, which are filed with the SEC. A more complete description will be available in the definitive registration statement on Form F-4 and the joint proxy statement/prospectus.

No Offer or Solicitation

This communication is not intended to and shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote of 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.

Forward-Looking Statements

This communication contains “forward-looking statements” within the meaning of the federal securities laws, including Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. In this context, forward-looking statements often address expected future business and financial performance and financial condition, and often contain words such as “expect,” “anticipate,” “intend,” “plan,” “believe,” “seek,” “see,” “will,” “would,” “target,” similar expressions, and variations or negatives of these words. Forward-looking statements by their nature address matters that are, to different degrees, uncertain, such as statements about the consummation of the proposed transaction and the anticipated benefits thereof. These and other forward-looking statements, including the failure to consummate the proposed transaction or to make or take any filing or other action required to consummate such transaction on a timely matter or at all, are not guarantees of future results and are subject to risks, uncertainties and assumptions that could cause actual results to differ materially from those expressed in any forward-looking statements. Important risk factors that may cause such a difference include, but are not limited to, (i) the completion of the proposed transaction on anticipated terms and timing, including obtaining shareholder or stockholder (as applicable) and regulatory approvals, anticipated tax treatment, unforeseen liabilities, future capital expenditures, revenues, expenses, earnings, synergies, economic performance, indebtedness, financial condition, losses, future prospects, business and management strategies for the management, expansion and growth of the combined company’s operations and other conditions to the completion of the merger, (ii) the ability of IHS and Markit to integrate the business successfully and to achieve anticipated synergies, risks and costs, (iii) potential litigation relating to the proposed transaction that could be instituted against IHS, Markit or their respective directors, (iv) the risk that disruptions from the proposed transaction will harm IHS’s and Markit’s business, including current plans and operations, (v) the ability of IHS or Markit to retain and hire key personnel, (vi) potential adverse reactions or changes to business relationships resulting from the announcement or completion of the merger, (vii) continued availability of capital and financing and rating agency actions, (viii) legislative, regulatory and economic developments, (ix) potential business uncertainty, including changes to existing business relationships, during the pendency of the merger that could affect IHS’s and/or Markit’s financial

performance, (x) certain restrictions during the pendency of the merger that may impact IHS’s or Markit’s ability to pursue certain business opportunities or strategic transactions and (xi) unpredictability and severity of catastrophic events, including, but not limited to, acts of terrorism or outbreak of war or hostilities, as well as management’s response to any of the aforementioned factors. These risks, as well as other risks associated with the proposed merger, are more fully discussed in the joint proxy statement/prospectus included in the preliminary registration statement on Form F-4 filed with the SEC in connection with the proposed merger. While the list of factors presented here is, and the list of factors presented in the preliminary registration statement on Form F-4 are, considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward-looking statements. Consequences of material differences in results as compared with those anticipated in the forward-looking statements could include, among other things, business disruption, operational problems, financial loss, legal liability to third parties and similar risks, any of which could have a material adverse effect on IHS’s or Markit’s consolidated financial condition, results of operations, credit rating or liquidity. Neither IHS nor Markit assumes any obligation to publicly provide revisions or updates to any forward-looking statements, whether as a result of new information, future developments or otherwise, should circumstances change, except as otherwise required by securities and other applicable laws.

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