SUMMARY

The following summary contains certain information described in more detail elsewhere in this document. It does not contain all the details concerning the Transactions, including information that may be important to you. To better understand the Transactions, you should carefully review this entire document and the documents it refers to. See “Where You Can Find More Information; Incorporation by Reference.”

The Companies

Olin Corporation

Olin Corporation

190 Carondelet Plaza, Suite 1530

Clayton, Missouri 63105

Telephone: (314) 480-1400

Olin Corporation, incorporated in 1892, is a Virginia corporation having its principal executive offices in Clayton, MO. Olin Corporation is a manufacturer concentrated in three business segments: Chlor Alkali Products, Chemical Distribution and Winchester.

Blue Cube Acquisition Corp.

Blue Cube Acquisition Corp.

c/o Olin Corporation

190 Carondelet Plaza, Suite 1530

Clayton, Missouri 63105

Telephone: (314) 480-1400

Blue Cube Acquisition Corp., a Delaware corporation referred to in this document as Merger Sub, is a newly formed, direct wholly-owned subsidiary of Olin that was organized specifically for the purpose of completing the Merger. Merger Sub has engaged in no business activities to date and it has no material assets or liabilities of any kind, other than those incident to its formation and in connection with the Transactions.

The Dow Chemical Company

The Dow Chemical Company

2030 Dow Center

Midland, Michigan 48674

Telephone: (989) 636-1000

The Dow Chemical Company, incorporated in 1947 under Delaware law, is the successor to a Michigan corporation of the same name, organized in 1897. TDCC’s principal executive offices are located at 2030 Dow Center, Midland, Michigan 48674. In 2014, TDCC had annual sales of more than $58 billion and employed approximately 53,000 people worldwide. TDCC’s more than 6,000 product families are manufactured at 201 sites in 35 countries across the globe.

Blue Cube Spinco Inc.

Blue Cube Spinco Inc.

c/o The Dow Chemical Company

2030 Dow Center

Midland, Michigan 48674

Telephone: (989) 636-1000

Blue Cube Spinco Inc., a Delaware corporation referred to in this document as Splitco, is a newly formed, direct, wholly-owned subsidiary of TDCC that was organized specifically for the purpose of effecting the Separation. Splitco has engaged in no business activities to date and it has no material assets or liabilities of any kind, other than those incident to its formation and in connection with the Transactions.

Splitco is a holding company. In the Transactions, TDCC will transfer, directly or indirectly, certain assets and liabilities related to DCP to Splitco or the DCP Subsidiaries and will contribute the equity interests in the DCP Subsidiaries to Splitco. In exchange therefor, Splitco will incur new indebtedness and will pay to TDCC the Special Payment in an amount equal to the Below Basis Amount. Splitco will also issue to TDCC the Splitco Securities or, at TDCC’s election, pay to TDCC as a dividend an amount in cash equal to the Above Basis Amount. For the fiscal year ended December 31, 2014, DCP generated net sales of $4,776 million and a net loss of $7  million.

The Transactions

On March 27, 2015, Olin and TDCC announced that they, along with Splitco and Merger Sub, had entered into the Merger Agreement, and that TDCC and Splitco had entered into the Separation Agreement, which together provide for the combination of Olin’s business and DCP. In the Transactions, TDCC will transfer DCP to Splitco. Prior to the Distribution, Splitco will incur new indebtedness and will pay to TDCC the Special Payment. Splitco will also issue to TDCC the Splitco Securities or, at TDCC’s election, pay to TDCC as a dividend an amount in cash equal to the Above Basis Amount. If issued, the Splitco Securities are expected to be transferred by TDCC to investment banks and/or commercial banks on or about the closing date of the Merger in exchange for existing TDCC Debt in the Debt Exchange. As a result, TDCC expects to receive approximately $2,030 million from the Special Payment and the Debt Exchange.

On the closing date of the Merger, TDCC will distribute shares of Splitco common stock to its participating shareholders in an exchange offer. If the exchange offer is consummated but is not fully subscribed, TDCC will distribute the remaining shares of Splitco common stock on a pro rata basis to TDCC shareholders whose shares of TDCC common stock remain outstanding after the consummation of the exchange offer. Any TDCC shareholder who validly tenders (and does not properly withdraw) shares of TDCC common stock for shares of Splitco common stock in the exchange offer will waive its rights with respect to such shares to receive, and forfeit any rights to, shares of Splitco common stock distributed on a pro rata basis to TDCC shareholders in the event the exchange offer is not fully subscribed. If there is a pro rata distribution, the exchange agent will calculate the exact number of shares of Splitco common stock not exchanged in the exchange offer and to be distributed on a pro rata basis, and the number of shares of Olin common stock into which the remaining shares of Splitco common stock will be converted in the Merger will be transferred to TDCC shareholders (after giving effect to the consummation of the exchange offer) as promptly as practicable thereafter. Immediately after the Distribution and on the closing date of the Merger, Merger Sub will merge with and into Splitco, whereby the separate corporate existence of Merger Sub will cease and Splitco will continue as the surviving company and a wholly-owned subsidiary of Olin. In the Merger, each share of Splitco common stock will be converted into the right to receive Olin common stock based on the exchange ratio set forth in the Merger Agreement, as described in the section of this document entitled “The Merger Agreement—Merger Consideration.”

Olin expects to issue approximately 87.5 million shares of Olin common stock in the Merger. Based upon the reported closing sale price of $22.50 per share for Olin common stock on the NYSE on August 5, 2015, the total value of the shares to be issued by Olin and the cash and debt instruments expected to be received by TDCC in the Transactions, including up-front payments under the Ethylene Agreements, would have been approximately $4,495 million. The actual value of the Olin common stock to be issued in the Merger will depend on the market price of shares of Olin common stock at the time of determination.

After the Merger, Olin will own and operate DCP through Splitco, which will be Olin’s wholly-owned subsidiary, and will also continue its current businesses. All shares of Olin common stock, including those issued in the Merger, will be listed on the NYSE under Olin’s current trading symbol “OLN.”

Below is a step-by-step description of the sequence of material events relating to the Transactions.

Step 1    Separation

On or prior to the date of the Distribution, TDCC will transfer DCP to Splitco or the DCP Subsidiaries. Splitco and the DCP Subsidiaries are newly formed, direct and indirect wholly-owned subsidiaries of TDCC. This transfer will include, among other assets and liabilities of DCP, TDCC’s equity interests in the JV Entity, which, because the JV Partner has exercised its right to transfer its equity interests in the JV Entity to TDCC or TDCC’s designee in connection with the Transactions pursuant to the organizational documents of the JV Entity, will constitute 100 percent of the equity interests in the JV Entity, as more fully described under “The Separation Agreement—Separation of the Dow Chlorine Products Business—Transfer of the JV Entity Interests.”

Step 2    Contribution

Immediately prior to the Distribution, and on the closing date of the Merger, TDCC will effect the Contribution, pursuant to which all of the DCP Subsidiaries will become direct or indirect subsidiaries of Splitco.

Step 3    Incurrence of Debt and Issuance of Splitco Common Stock to TDCC

On or about the closing date of the Merger, Olin and Splitco will incur new indebtedness in an aggregate principal amount of approximately $2,237 million. Splitco will use a portion of the proceeds thereof to pay to TDCC the Special Payment immediately prior to the Distribution, and the remainder of the proceeds will be used to refinance certain existing debt of Olin and the JV Entity and to pay fees and expenses of Olin and make other payments in connection with the Transactions. In addition, immediately prior to the Distribution, Splitco expects to issue to TDCC the Splitco Securities or, at TDCC’s election, pay to TDCC as a dividend an amount in cash equal to the Above Basis Amount. TDCC expects to transfer the Splitco Securities, if issued, on or about the date of the Distribution to investment banks and/or commercial banks in exchange for existing TDCC debt. The Splitco Securities are expected to be subsequently sold to third-party investors as described below. As a result, TDCC expects to receive approximately $2,030 million from the Special Payment and the Debt Exchange. If TDCC determines that the Debt Exchange is not reasonably likely to be consummated at the time of the Distribution and elects to receive cash from Splitco in lieu of the Splitco Securities as described under “The Merger Agreement—Debt Exchange,” Splitco will incur new indebtedness in the form of debt securities, term loans or a combination thereof to finance such cash payment.

Immediately prior to the Distribution, Splitco will also issue to TDCC additional shares of Splitco common stock. Following this issuance, TDCC will own 100,000,000 shares of Splitco common stock, which will constitute all of the outstanding stock of Splitco.

Step 4    Distribution—Exchange Offer

TDCC will offer to TDCC shareholders the right to exchange all or a portion of their shares of TDCC common stock for shares of Splitco common stock at a 10 percent discount, calculated as set forth in this document, to the equivalent per-share value of Olin common stock in an exchange offer based on the 0.87482759 shares of Olin common stock corresponding to each share of Splitco common stock as specified in the Merger Agreement.

If the exchange offer is consummated but is not fully subscribed, TDCC will distribute the remaining shares of Splitco common stock on a pro rata basis to TDCC shareholders whose shares of TDCC

common stock remain outstanding after the consummation of the exchange offer. Any TDCC shareholder who validly tenders (and does not properly withdraw) shares of TDCC common stock for shares of Splitco common stock in the exchange offer will waive their rights with respect to such shares to receive, and forfeit any rights to, shares of Splitco common stock distributed on a pro rata basis to TDCC shareholders in the event the exchange offer is not fully subscribed. If there is a pro rata distribution, the exchange agent will calculate the exact number of shares of Splitco common stock not exchanged in the exchange offer and to be distributed on a pro rata basis, and the number of shares of Olin common stock into which the remaining shares of Splitco common stock will be converted in the Merger will be transferred to TDCC shareholders (after giving effect to the consummation of the exchange offer) as promptly as practicable thereafter.

The exchange agent will hold, for the account of the relevant TDCC shareholders, the global certificate(s) representing all of the outstanding shares of Splitco common stock, pending the consummation of the Merger. Shares of Splitco common stock will not be able to be traded during this period.

Step 5    Merger

Immediately after the Distribution, Merger Sub will merge with and into Splitco, whereby the separate corporate existence of Merger Sub will cease and Splitco will continue as the surviving company and as a wholly-owned subsidiary of Olin. In the Merger, each share of Splitco common stock will be converted into the right to receive Olin common stock based on the exchange ratio set forth in the Merger Agreement, as described in the section of this document entitled “The Merger Agreement—Merger Consideration.”

Immediately after the consummation of the Merger, approximately 52.7 percent of the outstanding shares of Olin common stock is expected to be held by pre-Merger holders of Splitco common stock and approximately 47.3 percent of the outstanding shares of Olin common stock is expected to be held by pre-Merger Olin shareholders.

Step 6    Sale of Splitco Securities to Third-Party Investors

As described in Step 3 above, TDCC and Olin expect the Splitco Securities to be transferred by TDCC on or about the closing date of the Merger to investment banks and/or commercial banks in the Debt Exchange in exchange for existing TDCC debt. The Splitco Securities will then be sold by the investment banks and/or commercial banks to third-party investors.

Set forth below are diagrams that graphically illustrate, in simplified form, the existing corporate structures, the corporate structures immediately following the Distribution, and the corporate structures immediately following the consummation of the Transactions contemplated by the Merger Agreement.

After completion of all of the steps described above, Olin’s wholly-owned subsidiary, Splitco, will hold DCP through its subsidiaries and will be the obligor under the Splitco Securities, if issued, and the other new indebtedness to be incurred by Splitco on or about the date of the Distribution, which, after the consummation of the Merger, are expected to be guaranteed by Olin.

In connection with the Transactions, on the date of the Distribution, TDCC or its subsidiaries and Splitco or the DCP Subsidiaries will enter into the Additional Agreements relating to, among other things, intellectual property agreements, real property agreements, site and business services agreements, agreements relating to the supply of electricity and agreements for the purchase and sale of certain raw materials and finished products. See “Other Agreements—Other Ancillary Agreements.”

Number of Shares of Splitco Common Stock to Be Distributed to TDCC Shareholders

TDCC is offering to exchange all issued and outstanding shares of Splitco common stock for shares of TDCC common stock validly tendered and not properly withdrawn. Splitco has authorized the issuance of 100,000,000 shares of Splitco common stock. 100,000,000 shares of Splitco common stock will be issued and outstanding and held by TDCC immediately prior to the Distribution. Accordingly, the total number of shares of Splitco common stock to be exchanged for shares of TDCC common stock in this exchange offer will be equal to 100,000,000 shares.

Terms of this Exchange Offer

TDCC is offering to exchange all issued and outstanding shares of Splitco common stock for shares of TDCC common stock. You may tender all, some or none of your shares of TDCC common stock. This document and related documents are being sent to persons who directly held shares of TDCC common stock on

September 1, 2015, and brokers, banks and similar persons whose names or the names of whose nominees appear on TDCC’s shareholder list or, if applicable, who are listed as participants in a clearing agency’s security position listing for subsequent transmittal to beneficial owners of TDCC common stock.

TDCC common stock validly tendered and not properly withdrawn will be accepted for exchange at the exchange ratio determined as described under “This Exchange Offer—Terms of this Exchange Offer,” on the terms and conditions of this exchange offer and subject to the limitations described below, including the proration provisions. TDCC will promptly return any shares of TDCC common stock that are not accepted for exchange following the expiration of this exchange offer and the determination of the final proration factor, if any, described in the section of this document entitled “This Exchange Offer—Terms of this Exchange Offer.”

For the purposes of illustration, the table below indicates the number of shares of Splitco common stock that you would receive per share of TDCC common stock validly tendered and accepted in this exchange offer, calculated on the basis described under “This Exchange Offer—Terms of this Exchange Offer” and taking into account the upper limit described above, assuming a range of averages of the daily VWAP of TDCC common stock and Olin common stock on the Valuation Dates. The first row of the table below shows the indicative calculated per-share values of TDCC common stock and Splitco common stock and the indicative exchange ratio that would have been in effect following the official close of trading on the NYSE on September 1, 2015, based on the daily VWAPs of TDCC common stock and Olin common stock on August 28, 2015, August 31, 2015, and September 1, 2015. The table also shows the effects of a 5 percent increase or decrease in either or both the calculated per-share values of TDCC common stock and Olin common stock based on changes relative to the values as of September 1, 2015.

During the three-month period of June 1, 2015 through September 1, 2015, the highest closing price of TDCC common stock on the NYSE was $53.59 and the lowest closing price of Olin common stock on the NYSE was $18.77. If the calculated per-share values of TDCC common stock and Splitco common stock were calculated based on these closing prices, you would receive only the limit of 2.9318 shares of Splitco common stock for each share of TDCC common stock tendered, and the value of such shares of Splitco common stock, based on the Olin common stock price multiplied by 0.87482759 (which is the number of shares of Olin common stock to be received for each share of Splitco common stock in the Merger), would have been less than the value of TDCC common stock accepted for exchange (approximately $0.90 of Splitco common stock for each $1.00 of TDCC common stock accepted for exchange).

Extension; Termination

This exchange offer, and your withdrawal rights, will expire at 8:00 a.m., New York City time, on October 1, 2015, unless TDCC extends this exchange offer (or with respect to any shares attributable to units of the TDCC Stock Fund allocated to your account under the Dow Savings Plan, by such earlier deadline as established by the Trustee of the plan). You must tender your shares of TDCC common stock prior to this time if you want to participate in this exchange offer. TDCC may extend or terminate this exchange offer as described in this document.

Mandatory Extension

If the upper limit on the number of shares that can be received for each share of TDCC common stock tendered is in effect at the last trading day prior to the expiration of the exchange offer period, then the exchange ratio will be fixed at the upper limit and a Mandatory Extension of this exchange offer will be made until 8:00 a.m., New York City time, on the day after the second trading day following the last trading day prior to the originally contemplated expiration date to permit shareholders to tender or withdraw their shares of TDCC common stock during those days.

In case of an extension of this exchange offer, TDCC will publicly announce the extension by press release no later than 9:00 a.m., New York City time, on the next business day following any such Mandatory Extension. However, in the case of shares attributable to units of the TDCC Stock Fund held under the Dow Savings Plan, the Trustee may extend the applicable election deadline, to the extent administratively feasible, for participants in the Dow Savings Plan.

Conditions for Consummation of this Exchange Offer

TDCC’s obligation to exchange shares of Splitco common stock for shares of TDCC common stock is subject to the conditions listed under “This Exchange Offer—Conditions for Consummation of this Exchange Offer,” including the satisfaction of conditions to the Transactions and other conditions. These conditions include:

For a description of the material conditions precedent to the Transactions, see “The Merger Agreement—Conditions to the Merger.”

TDCC may waive any of the conditions to this exchange offer prior to the expiration of this exchange offer. Splitco has no right to waive any of the conditions to this exchange offer.

Proration; Tenders for Exchange by Holders of Fewer than 100 Shares of TDCC Common Stock

If, upon the expiration of this exchange offer, TDCC shareholders have validly tendered and not properly withdrawn more shares of TDCC common stock than TDCC is able to accept for exchange (taking into account the exchange ratio and the total number of shares of Splitco common stock owned by TDCC), TDCC will accept for exchange the shares of TDCC common stock validly tendered and not properly withdrawn by each tendering shareholder on a pro rata basis, based on the proportion that the total number of shares of TDCC common stock to be accepted bears to the total number of shares of TDCC common stock validly tendered and not properly withdrawn (rounded to the nearest whole number of shares of TDCC common stock), and subject to any adjustment necessary to ensure the exchange of all shares of Splitco common stock owned by TDCC, except for tenders of odd-lots, as described below.

TDCC will announce the preliminary proration factor at www.edocumentview.com/dowexchange and separately by press release as promptly as practicable after the expiration date. Upon determining the number of shares of TDCC common stock validly tendered for exchange, TDCC will announce the final results, including the final proration factor.

Beneficial holders of fewer than 100 shares of TDCC common stock (excluding any shares attributable to units of the TDCC Stock Fund allocated to their account under the Dow Savings Plan) who validly tender all of their shares held outside of the plan may elect not to be subject to proration by completing the box in the applicable letter of transmittal entitled “Odd-Lot Shares.” If your odd-lot shares are held by a broker for your account, you can contact the broker and request this preferential treatment. All of your odd-lot shares will be accepted for exchange without proration if TDCC completes this exchange offer. As outlined above, the foregoing “odd-lots” preference does not apply to shares attributable to units of the TDCC Stock Fund held in participant accounts under the Dow Savings Plan and Trust. Thus, if a participant in the Dow Savings Plan tenders all of his or her shares of TDCC common stock attributable to units of the TDCC Stock Fund held under the plan, those shares will be subject to proration even if the participant holds units under the plan representing fewer than 100 shares.

Fractional Shares

Immediately following the consummation of this exchange offer, Merger Sub will be merged with and into Splitco, whereby the separate corporate existence of Merger Sub will cease and Splitco will continue as the surviving company and a wholly-owned subsidiary of Olin. Each outstanding share of Splitco common stock will be converted into the right to receive 0.87482759 shares of Olin common stock. In this conversion of shares of Splitco common stock into shares of Olin common stock, no fractional shares of Olin common stock will be delivered to holders of Splitco common stock. All fractional shares of Olin common stock that holders of shares of Splitco common stock would otherwise be entitled to receive as a result of the Merger will be aggregated by a transfer agent appointed by Olin. The transfer agent will cause the whole shares obtained by such aggregation to be sold on behalf of such holders of shares of Splitco common stock that would otherwise be entitled to receive such fractional shares of Olin common stock in the Merger, in the open market or otherwise, in each case at then-prevailing market prices as soon as practicable after the Merger. The transfer agent will make available the net proceeds thereof, after deducting any required withholding taxes and brokerage charges, commissions and transfer taxes, on a pro rata basis, without interest, as soon as practicable following the Merger to the holders of Splitco common stock that would otherwise be entitled to receive such fractional shares of Olin common stock in the Merger.

Procedures for Tendering

For you to validly tender your shares of TDCC common stock pursuant to this exchange offer, prior to the expiration of this exchange offer:

Notwithstanding anything in this document to the contrary, with respect to shares of TDCC common stock held under the Dow Savings Plan, the terms of such plan and Trust and applicable law govern all transactions involving such shares of TDCC common stock. It is possible that the investment fiduciaries of the Dow Savings Plan, to fulfill their fiduciary obligations, will impose additional conditions and limitations on the participation of the plan and its participants in the exchange offer or will determine that the Olin common stock will not be a permitted investment under the plan. If that is the case, participants in the Dow Savings Plan will be so notified.

Delivery of Shares of Splitco Common Stock

Upon the consummation of this exchange offer, TDCC will deliver to the exchange agent a global certificate representing all of the Splitco common stock being distributed in this exchange offer, with irrevocable instructions to hold the shares of Splitco common stock in trust for the holders of TDCC common stock validly tendered and not withdrawn in this exchange offer and, in the case of a pro rata distribution, holders of TDCC common stock whose shares of TDCC common stock remain outstanding after the consummation of this exchange offer. Olin will deposit in a reserve account with its transfer agent for the benefit of persons who received shares of Splitco common stock in this exchange offer book-entry authorizations representing shares of Olin common stock, with irrevocable instructions to hold the shares of Olin common stock in trust for the holders of Splitco common stock. Shares of Olin common stock will be delivered promptly following the expiration of this exchange offer, the acceptance of TDCC common stock for exchange, the determination of the final proration factor, if any, and the effectiveness of the Merger, pursuant to the procedures determined by the exchange agent and Olin’s transfer agent. See “This Exchange Offer—Terms of this Exchange Offer—Exchange of Shares of TDCC Common Stock.”

Withdrawal Rights

You may withdraw your tendered shares of TDCC common stock at any time prior to the expiration of this exchange offer by following the procedures described herein. If you change your mind again, you may re-tender your TDCC common stock by again following the exchange offer procedures prior to the expiration of this exchange offer. If you participate in the Dow Savings Plan and have elected to tender shares attributable to units

of the TDCC Stock Fund held in your plan account, you may withdraw such tendered shares, and re-tender your shares if you change your mind again, prior to the deadline set forth in the Trustee’s informational materials provided to you, in accordance with the procedures set forth in those materials.

No Appraisal Rights

No appraisal rights are available to holders of TDCC common stock in connection with this exchange offer or any pro rata distribution of shares of Splitco common stock.

Distribution of Any Shares of Splitco Common Stock Remaining After this Exchange Offer

If this exchange offer is consummated but fewer than all of the issued and outstanding shares of Splitco common stock are exchanged because the exchange offer is not fully subscribed, TDCC will distribute the remaining shares of Splitco common stock on a pro rata basis to TDCC shareholders whose shares of TDCC common stock remain outstanding after the consummation of this exchange offer. The record date for the pro rata distribution, if any, will be announced by TDCC. Any TDCC shareholder who validly tenders (and does not properly withdraw) shares of TDCC common stock for shares of Splitco common stock in the exchange offer will waive their rights with respect to such shares to receive, and forfeit any rights to, shares of Splitco common stock distributed on a pro rata basis to TDCC shareholders in the event the exchange offer is not fully subscribed.

If there is a pro rata distribution, the exchange agent will calculate the exact number of shares of Splitco common stock not exchanged in the exchange offer and to be distributed on a pro rata basis, and the number of shares of Olin common stock into which the remaining shares of Splitco common stock will be converted in the Merger will be transferred to TDCC shareholders (after giving effect to the consummation of the exchange offer) as promptly as practicable thereafter.

If this exchange offer is terminated by TDCC without the exchange of shares, but the conditions for the consummation of the Transactions have otherwise been satisfied, TDCC intends to distribute all shares of Splitco common stock owned by TDCC on a pro rata basis to holders of TDCC common stock with a record date to be announced by TDCC.

Legal Limitations; Certain Matters Relating to Non-U.S. Jurisdictions

This document is not an offer to sell or exchange and it is not a solicitation of an offer to buy any shares of TDCC common stock, Splitco common stock or Olin common stock in any jurisdiction in which the offer, sale or exchange is not permitted. It will not be possible to trade the shares of Splitco common stock after the consummation of this exchange offer and prior to the consummation of the Merger or during any other period. Countries outside the United States generally have their own legal requirements that govern securities offerings made to persons resident in those countries and often impose stringent requirements about the form and content of offers made to the general public. None of TDCC, Splitco or Olin have taken any action under non-U.S. regulations to facilitate a public offer to exchange shares of TDCC common stock, Splitco common stock or Olin common stock outside the United States. Accordingly, the ability of any non-U.S. person to tender shares of TDCC common stock in the exchange offer will depend on whether there is an exemption available under the laws of such person’s home country that would permit the person to participate in the exchange offer without the need for TDCC, Olin or Splitco to take any action to facilitate a public offering in that country. For example, some countries exempt transactions from the rules governing public offerings if they involve persons who meet certain eligibility requirements relating to their status as sophisticated or professional investors.

Non-U.S. shareholders should consult their advisors in considering whether they may participate in the exchange offer in accordance with the laws of their home countries and, if they do participate, whether there are any restrictions or limitations on transactions in the shares of TDCC common stock, Splitco common stock or Olin common stock that may apply in their home countries. TDCC, Olin and Splitco cannot provide any assurance about whether such limitations may exist. See “This Exchange Offer—Certain Matters Relating to Non-U.S. Jurisdictions” for additional information about limitations on the exchange offer outside the United States.

Risk Factors

In deciding whether to tender your shares of TDCC common stock in this exchange offer, you should carefully consider the matters described in the section “Risk Factors,” as well as other information included in this document and the other documents to which you have been referred.

Debt Financing

In connection with the entry into the Merger Agreement, Olin entered into the Commitment Letters, the New Credit Facilities and the Sumitomo Credit Agreement with various lenders pursuant to which those parties agreed to provide various forms of financing to Olin and Splitco in connection with the Transactions. The terms of the debt financing, including any conditions thereto and covenants thereunder, are set out in various definitive documentation entered into or to be entered into by the respective parties. See “Debt Financing.”

Interests of Olin’s Directors and Executive Officers in the Transactions

Certain of Olin’s directors and executive officers have financial interests in the Transactions that may be different from, or in addition to, the interests of Olin’s shareholders generally. The members of the Olin Board were aware of and considered these interests, among other matters, in reaching the determination to approve the terms of the Transactions, including the Merger, and in recommending to Olin’s shareholders that they vote to approve the Share Issuance and the Charter Amendment.

Board of Directors and Management of Olin Following the Transactions

Following the consummation of the exchange offer, Merger Sub will merge with and into Splitco, whereby the separate corporate existence of Merger Sub will cease and Splitco will continue as the surviving company and a wholly owned subsidiary of Olin. In connection with the Transactions, the size of the Olin Board will be increased to include three additional directors to be designated by TDCC, effective at the time of closing of the Merger. The Merger Agreement provides that at the next annual election of directors of Olin, the Olin Board will take all actions necessary to include each of the TDCC designees as nominees for the Olin Board for election by Olin’s shareholders. The executive officers of Olin immediately prior to the consummation of the Merger are expected to be the executive officers of Olin immediately following the consummation of the Merger.

Shareholder Approvals

Olin cannot complete the Transactions unless the proposal relating to the Share Issuance is approved by the affirmative vote of a majority of votes cast on the proposal at the special meeting and the proposal relating to the Charter Amendment is approved by the affirmative vote of a majority of the shares of Olin common stock entitled to vote on the proposal. Additionally, TDCC as the sole shareholder of Splitco, and subject to satisfaction of the conditions set out in the Merger Agreement and the Separation Agreement, will approve the Merger prior to the Distribution.

Accounting Treatment and Considerations

ASC 805, Business Combinations, requires the use of the acquisition method of accounting for business combinations. In applying the acquisition method, it is necessary to identify both the accounting acquiree and the accounting acquiror. In a business combination effected through an exchange of equity interests, such as the Merger, the entity that issues the interests (Olin in this case) is generally the acquiring entity. In identifying the acquiring entity in a combination effected through an exchange of equity interests, however, all pertinent facts and circumstances must be considered, including the following:

Olin’s management has determined that Olin will be the accounting acquiror in the Merger based on the facts and circumstances outlined above and the detailed analysis of the relevant GAAP guidance. Consequently, Olin will apply acquisition accounting to the assets and liabilities of Splitco acquired or assumed upon the consummation of the Merger. The historical financial statements of Olin for periods ended prior to the consummation of the Merger will reflect only the operations and financial condition of Olin.

Material U.S. Federal Income Tax Consequences of the Distribution and the Merger

On the basis that the Distribution, together with certain related transactions, qualifies as a “reorganization” for U.S. federal income tax purposes under Sections 355 and 368(a)(1)(D) of the Code, in general, for U.S. federal income tax purposes, no gain or loss will be recognized by, and no amount will be included in the income of, U.S. holders of TDCC common stock upon the receipt of Splitco common stock in this exchange offer or in any pro rata distribution of Splitco common stock distributed to holders of TDCC common stock if this exchange offer is undersubscribed (or if TDCC determines not to consummate the exchange offer).

The consummation of the Distribution (which includes this exchange offer) is conditioned upon the receipt of the Private Letter Ruling (as defined above in “Helpful Information”). Although a private letter ruling from the IRS generally is binding on the IRS, TDCC and Splitco will not be able to rely on the Private Letter Ruling if the factual representations made to the IRS in connection with the Private Letter Ruling request prove to be inaccurate, or incomplete, in any material respect, or if undertakings made to the IRS in connection with the request for the Private Letter Ruling are not satisfied. If the Distribution and/or the Merger fails to qualify for tax-free treatment, TDCC and/or its shareholders will be subject to tax. See “Risk Factors—Risks Related to the Transactions—If the Distribution, including the Debt Exchange, does not qualify as a tax-free transaction under Section 368(a)(1)(D) or 355 of the Code or the Merger does not qualify as a tax-free “reorganization” under section 368(a) of the Code, including as a result of actions taken in connection with the Distribution or the Merger or as a result of subsequent acquisitions of shares of TDCC, Olin or Splitco stock, then TDCC and/or TDCC shareholders may be required to pay substantial U.S. federal income taxes, and in certain circumstances and subject to certain conditions, Splitco and Olin may be required to indemnify TDCC for any such tax liability.”

The U.S. federal income tax rules governing the treatment of the Transactions are complex and the tax consequences of the Transactions to you will depend on the facts of your particular situation. You should read the

summary in the section of this document entitled “This Exchange Offer—Material U.S. Federal Income Tax Consequences of the Distribution and the Merger” and consult your own tax advisor for a full understanding of the U.S. federal income tax consequences to you of the Transactions.

TDCC shareholders are urged to consult with their own tax advisors regarding the tax consequences of the Distribution, the Merger and related Transactions to them, as applicable, including the effects of U.S. federal, state, local, foreign and other tax laws.

The Distribution

The consummation of the Distribution and the related Transactions are conditioned upon, among other things, the receipt of the TDCC RMT Tax Opinion from tax counsel to TDCC, substantially to the effect that (among other things) the Distribution, together with certain related transactions, will qualify as a reorganization for U.S. federal income tax purposes. The TDCC RMT Tax Opinion will be based on, among other things, certain facts and assumptions as well as the accuracy of certain representations, statements and undertakings made to counsel. If any of these representations, statements or undertakings are, or become, inaccurate or incomplete, the TDCC RMT Tax Opinion may be invalid. An opinion of counsel represents counsel’s best legal judgment, is not binding on the IRS or the courts, and the IRS or the courts may not agree with the conclusions reached in the opinion.

On the basis that the Distribution, together with certain related transactions, qualifies as a “reorganization” for U.S. federal income tax purposes under Sections 355 and 368(a)(1)(D) of the Code, in general, for U.S. federal income tax purposes: (i) no gain or loss will be recognized by, and no amount will be included in the income of, U.S. holders of TDCC common stock upon the receipt of Splitco common stock in this exchange offer or in any pro rata distribution of Splitco common stock distributed to holders of TDCC common stock if this exchange offer is undersubscribed (or if TDCC determines not to consummate the exchange offer); (ii) in a split-off, the aggregate tax basis of the shares of Splitco common stock (including fractional shares) issued to a holder of TDCC common stock will equal the aggregate tax basis of the shares of TDCC common stock exchanged therefor; (iii) the aggregate tax basis of any shares of Splitco common stock (including fractional shares) issued as a pro rata distribution to holders of TDCC common stock if this exchange offer is undersubscribed (or if TDCC determines not to consummate the exchange offer) will be determined by allocating the aggregate tax basis of such holder in the shares of TDCC common stock with respect to which the pro rata distribution is made immediately before such distribution between such TDCC common stock and the Splitco common stock in proportion to the relative fair market value of each immediately following such distribution; and (iv) the holding period of any shares of Splitco common stock received by a holder of TDCC common stock will include the holding period at the time of the consummation of this exchange offer of the shares of TDCC common stock with respect to which the shares of Splitco common stock were received, provided that the TDCC common stock is held as a capital asset on the date of the consummation of this exchange offer.

In general, if the Distribution does not qualify as a tax-free transaction under Sections 368(a)(1)(D) and 355 of the Code, (i) the exchange offer would be treated as a taxable exchange to TDCC shareholders who receive Splitco common stock in the exchange offer and (ii) the pro rata distribution of Splitco common stock, if this exchange offer is undersubscribed (or if TDCC determines not to consummate the exchange offer), would be treated as a taxable dividend to TDCC shareholders who receive such distribution in an amount equal to the fair market value of the Splitco common stock received.

The Merger

On the basis that the Merger qualifies as a “reorganization” within the meaning of Section 368(a) of the Code, in general, for U.S. federal income tax purposes: (i) no gain or loss will be recognized by, and no amount will be included in the income of, U.S. holders of Splitco common stock upon the receipt of Olin common stock in the Merger, except for any gain or loss recognized with respect to cash received in lieu of a fractional share of Olin common stock;

(ii) gain or loss will be recognized by holders of Splitco common stock on any cash received in lieu of a fractional share of Olin common stock in the Merger equal to the difference between the amount of cash received in lieu of the fractional share and the holder’s tax basis in the fractional share of Olin common stock (determined in the manner described in clause (ii) or (iii), as applicable under the section entitled “—The Distribution”; such gain or loss will be long-term capital gain or loss if the holder’s holding period for all of its Splitco common stock (determined in the manner described in clause (iv) under the section entitled “—The Distribution”) is more than one year as of the closing date of Merger, and the deductibility of capital losses is subject to limitations under the Code; (iii) the tax basis of Olin common stock received in the Merger, including any fractional share of Olin common stock deemed received, will be the same as the tax basis in the shares of Splitco common stock deemed exchanged therefor; and (iv) the holding period of Olin common stock received by a holder of Splitco common stock in the Merger will include the holding period of the Splitco common stock exchanged therefor.

Information Reporting and Backup Withholding

U.S. Treasury regulations generally require holders who own at least five percent of the total outstanding stock of TDCC and who receive Splitco common stock pursuant to the Distribution and holders who own at least one percent of the total outstanding stock of Splitco and who receive Olin common stock pursuant to the Merger to attach to his, her or its U.S. federal income tax return for the year in which the Distribution and the Merger occur a detailed statement setting forth certain information relating to the tax-free nature of the Distribution and the Merger, as the case may be. TDCC and/or Olin will provide the appropriate information to each holder upon request, and each such holder is required to retain permanent records of this information.

In addition, payments of cash to a holder of Splitco common stock in lieu of fractional shares of Olin common stock in the Merger may be subject to information reporting, unless the holder provides proof of an applicable exemption. Such payments that are subject to information reporting may also be subject to backup withholding (currently at a rate of 28 percent), unless such holder provides a correct taxpayer identification number and otherwise complies with the requirements of the backup withholding rules. Backup withholding does not constitute an additional tax, but merely an advance payment, which may be refunded or credited against a holder’s U.S. federal income tax liability, provided the required information is timely supplied to the IRS.

THE FOREGOING IS A SUMMARY OF THE MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO U.S. HOLDERS OF THE DISTRIBUTION AND THE MERGER UNDER CURRENT LAW AND FOR GENERAL INFORMATION ONLY. THE FOREGOING DOES NOT PURPORT TO ADDRESS ALL U.S. FEDERAL INCOME TAX CONSEQUENCES OR TAX CONSEQUENCES THAT MAY ARISE UNDER THE TAX LAWS OR THAT MAY APPLY TO PARTICULAR CATEGORIES OF SHAREHOLDERS. EACH TDCC SHAREHOLDER SHOULD CONSULT HIS, HER OR ITS OWN TAX ADVISOR AS TO THE PARTICULAR TAX CONSEQUENCES OF THE DISTRIBUTION AND THE MERGER TO SUCH SHAREHOLDER, INCLUDING THE APPLICATION OF U.S. FEDERAL, STATE, LOCAL AND FOREIGN TAX LAWS, AND THE EFFECT OF POSSIBLE CHANGES IN TAX LAWS THAT MAY AFFECT THE TAX CONSEQUENCES DESCRIBED ABOVE.

SUMMARY HISTORICAL AND PRO FORMA FINANCIAL DATA

The following summary combined financial data of DCP and summary consolidated financial data of TDCC and Olin are being provided to help you in your analysis of the financial aspects of the Transactions. You should read this information in conjunction with the financial information included elsewhere and incorporated by reference in this document. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations for the Dow Chlorine Products Business,” “Where You Can Find More Information; Incorporation by Reference,” “Information on the Dow Chlorine Products Business,” “Information on TDCC,” “Information on Olin,” “Selected Historical Financial Data” and “Unaudited Pro Forma Condensed Combined Financial Statements of Olin and the Dow Chlorine Products Business.”

Summary Historical Combined Financial Data of the Dow Chlorine Products Business

The following summary historical combined financial data of DCP as of and for the six months ended June 30, 2015 and June 30, 2014 has been derived from unaudited combined financial information included in this document. The following summary historical combined financial data of DCP as of and for each of the years ended December 31, 2014, 2013 and 2012 have been derived from audited combined financial statements of DCP included in this document. This information is only a summary and should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations for the Dow Chlorine Products Business,” the financial statements of DCP and the notes thereto and the unaudited pro forma condensed combined financial statements of Olin and the Dow Chlorine Products Business included elsewhere in this document.

Summary Historical Consolidated Financial Data of TDCC

The following summary historical consolidated financial data of TDCC as of and for the six months ended June 30, 2015 and June 30, 2014 has been derived from the unaudited interim consolidated financial statements of TDCC incorporated by reference in this document. The following summary historical consolidated financial data of TDCC as of and for the years ended December 31, 2014, 2013 and 2012 have been derived from TDCC’s audited consolidated financial statements incorporated by reference in this document. This information is only a summary and should be read in conjunction with the financial statements of TDCC and the notes thereto and the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section contained in TDCC’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 and TDCC’s Annual Report on Form 10-K for the year ended December 31, 2014, each of which is incorporated by reference in this document. See “Where You Can Find More Information; Incorporation By Reference.”

Summary Historical Consolidated Financial Data of Olin

The following summary historical consolidated financial data of Olin as of and for the six months ended June 30, 2015 and 2014 have been derived from the unaudited financial statements of Olin incorporated by reference in this document and is not necessarily indicative of the results or the financial condition to be expected for the remainder of the year or any future date or period. The data as of and for the years ended December 31, 2014, 2013 and 2012 have been derived from Olin’s audited consolidated financial statements incorporated by reference in this document. Since August 22, 2012, Olin’s summary historical financial data reflects the acquisition of KA Steel. This information is only a summary and should be read in conjunction with the financial statements of Olin and the notes thereto and the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section contained in Olin’s Quarterly Report on Form 10-Q for the three months ended June 30, 2015 and Olin’s Annual Report on Form 10-K for the year ended December 31, 2014, each of which is incorporated by reference in this document. See “Where You Can Find More Information; Incorporation by Reference.”

Summary Unaudited Pro Forma Condensed Combined Financial Data of Olin and the Dow Chlorine Products Business

The following summary unaudited pro forma condensed combined financial data present the pro forma condensed financial position and results of operations of Olin based upon the historical financial statements of each of Olin and DCP, after giving effect to the Merger and the other Transactions, and are intended to reflect the impact of the Merger and the other Transactions on Olin’s consolidated financial statements as if the relevant transactions occurred on the dates indicated below. The accompanying unaudited pro forma condensed combined financial information have been prepared using, and should be read in conjunction with, the respective unaudited consolidated or combined (as the case may be) financial statements of each of Olin and DCP as of and for the six months ended June 30, 2015 and the audited consolidated or combined (as the case may be) financial statements of each of Olin and DCP as of and for the year ended December 31, 2014. The accompanying unaudited pro forma condensed combined financial data is presented for illustrative purposes only and does not purport to be indicative of the actual results that would have been achieved by Olin if the Transactions had been consummated for the period presented or that will be achieved in the future. See “Risk Factors—Risks Related to the Transactions—The unaudited pro forma combined financial information of Olin and DCP is not intended to reflect what actual results of operations and financial condition would have been had Olin and DCP been a combined company for the periods presented, and therefore these results may not be indicative of Olin’s future operating performance.” This information is only a summary and has been derived from and should be read in conjunction with the financial statements of Olin and the notes thereto contained in Olin’s Quarterly Report on Form 10-Q for the three months ended June 30, 2015 and Olin’s Annual Report on Form 10-K for the year ended December 31, 2014, each of which is incorporated by reference in this document, the financial statements of DCP and the notes thereto included elsewhere in this document and the more detailed unaudited pro forma condensed combined financial statements of Olin and DCP and the notes thereto included elsewhere in this document. See “Where You Can Find More Information; Incorporation by Reference,” “Unaudited Pro Forma Condensed Combined Financial Statements of Olin and the Dow Chlorine Products Business,” and the audited and unaudited financial statements of the Dow Chlorine Products Business included elsewhere in this document.

A reconciliation of EBITDA to income (loss) determined in accordance with GAAP for the six months ended June 30, 2015 is provided below:

A reconciliation of EBITDA to income (loss) from continuing operations determined in accordance with GAAP for the year ended December 31, 2014 is provided below:

Included in DCP’s combined statement of operations from which the unaudited pro forma condensed combined financial statements have been derived are allocations of certain expenses for services including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, ethics and compliance, shared services, employee benefits and incentives, insurance and stock-based compensation. These expenses have been allocated on the basis of direct usage when identifiable with the remainder allocated on the basis of headcount or other measures. Olin management estimates that approximately $250 million of annual costs would not have been incurred had DCP been a part of Olin for the year ended December 31, 2014.

The unaudited pro forma condensed combined financial statements also do not reflect benefits that may result from the realization of approximately $200 million of annualized cost synergies expected to be realized

within three years following the consummation of the Transactions, or, if Olin is able to increase sales to new third-party customers and access new product markets as a result of the Transactions, the potential additional annualized synergies of up to $100 million that Olin estimates may potentially be achievable within three years from the consummation of the Transactions. Olin expects to incur approximately $100 to $150 million in transition-related costs and approximately $200 million in incremental capital spending during the first three years following the consummation of the Transactions that Olin management believes are necessary to realize the anticipated synergies from the Transactions.

Summary Comparative Historical and Pro Forma Per Share Data

The following table sets forth certain historical and pro forma per share data for Olin. The Olin historical data has been derived from and should be read together with Olin’s unaudited consolidated financial statements and related notes thereto contained in Olin’s Quarterly Report on Form 10-Q for the three months ended June 30, 2015 and Olin’s audited consolidated financial statements and related notes thereto contained in Olin’s Annual Report on Form 10-K for the year ended December 31, 2014, each of which is incorporated by reference in this document. See “Where You Can Find More Information; Incorporation by Reference.” The pro forma data has been derived from the unaudited pro forma condensed combined financial statements of Olin and DCP included elsewhere in this document. See the section of this document entitled “Unaudited Pro Forma Condensed Combined Consolidated Financial Information of Olin and the Dow Chlorine Products Business.”

This summary comparative historical and pro forma per share data is being presented for illustrative purposes only. Olin and DCP may have performed differently had the Transactions occurred prior to the periods or at the date presented. You should not rely on the pro forma per share data presented as being indicative of the results that would have been achieved had Olin and DCP been combined during the periods or at the date presented or of the actual future results or financial condition of Olin or DCP to be achieved following the consummation of the Transactions.

Historical Common Stock Market Price and Dividend Data

Historical market price data for Splitco has not been presented as DCP is currently operated by TDCC and there is no established trading market in Splitco common stock. Shares of Splitco common stock do not currently trade separately from TDCC common stock.

Shares of TDCC common stock currently trade on the NYSE under the symbol “DOW.” On March 26, 2015, the last trading day before the announcement of the Transactions, the last sale price of TDCC common stock reported by the NYSE was $46.86. On September 1, 2015, the last trading day prior to this document, the last sale price of TDCC common stock reported by the NYSE was $41.66.

Shares of Olin common stock currently trade on the NYSE under the symbol “OLN.” On March 26, 2015, the last trading day before the announcement of the Transactions, the last sale price of Olin common stock reported by the NYSE was $27.19. On September 1, 2015, the last trading day prior to this document, the last sale price of Olin common stock reported by the NYSE was $19.65.

The following table sets forth the high and low sale prices of TDCC common stock and Olin common stock on the NYSE for the periods indicated as well as the dividends per share declared by TDCC to holders of TDCC common stock and by Olin to holders of Olin common stock for these periods. The quotations are as reported in published financial sources.