Investor Contact: Larry P. Kromidas

(314) 480-1452

Email: lpkromidas@olin.com

News

Olin Corporation, 190 Carondelet Plaza, Suite 1530, Clayton, MO 63105-3443

FOR IMMEDIATE RELEASE

Olin Announces Receipt of All Required Foreign Regulatory Approvals

CLAYTON, MO. – July 6, 2015 – Olin Corporation (NYSE: OLN) announced today that it has received all the foreign regulatory approvals required to close its pending merger of The Dow Chemical Company’s chlorine value chain with Olin. The transaction is still subject to Olin shareholder approval and other customary closing conditions.

The transaction is expected to close by the end of the year.

About Olin

Headquartered in Clayton, Mo., Olin Corporation is a manufacturer concentrated in three business segments: Chlor Alkali Products, Chemical Distribution and Winchester. Chlor Alkali Products, with eight U. S. manufacturing facilities and one Canadian manufacturing facility, produces chlorine and caustic soda, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. Chemical Distribution manufactures bleach products and distributes caustic soda, bleach products, potassium hydroxide and hydrochloric acid. Winchester, with its principal manufacturing facilities in East Alton, IL and Oxford, MS, produces and distributes sporting ammunition, law enforcement ammunition, reloading components, small caliber military ammunition and components, and industrial cartridges. Today, Olin has approximately 3,900 employees. Visit olin.com for more information on Olin.

Forward-Looking Statements

This communication includes forward-looking statements. These statements relate to analyses and other information that are based on management’s beliefs, certain assumptions made by management, forecasts of future results, and current expectations, estimates and projections about the markets and economy in which Olin Corporation (“Olin”) and The Dow Chemical Company’s (“TDCC”) chlorine products business operate. These statements may include statements regarding the proposed combination of TDCC’s chlorine products business with Olin in a “Reverse Morris Trust” transaction, the expected timetable for completing the transaction, benefits and synergies of the transaction, future opportunities for the combined company and products and any other statements regarding Olin’s and TDCC’s chlorine products businesses’ future operations, anticipated business levels, future earnings, planned activities, anticipated growth, market opportunities, strategies and competition.

The statements contained in this communication that are not statements of historical fact may include forward-looking statements that involve a number of risks and uncertainties. We have used the words “anticipate,” “intend,” “may,” “expect,” “believe,” “plan,” “estimate,” “will,” and variations of such words and similar expressions in this communication to identify such forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions, which are difficult to predict and many of which are beyond our control. Therefore, actual outcomes and results may differ materially from those matters expressed or implied in such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to: factors relating to the satisfaction of the conditions to the proposed transaction, including regulatory approvals and the required approvals of Olin’s shareholders; the parties’ ability to meet expectations regarding the timing, completion and accounting and tax treatments of the proposed transaction; the possibility that Olin may be unable to achieve expected synergies and operating efficiencies in connection with the transaction within the expected time-frames or at all; the integration of the TDCC’s chlorine products business being more difficult, time-consuming or costly than expected; the effect of any changes resulting from the proposed transaction in customer, supplier and other business relationships; general market perception of the proposed transaction; exposure to lawsuits and contingencies associated with TDCC’s chlorine products business; the ability to attract and retain key personnel; prevailing market conditions; changes in economic and financial conditions of Olin and TDCC’s chlorine products business; uncertainties and matters beyond the control of management; and the other risks detailed in Olin’s Form 10-K for the fiscal year ended December 31, 2014 and Olin’s Form 10-Q for the fiscal quarter ended March 31, 2015. These risks, as well as other risks associated with Olin, TDCC’s chlorine products business and the proposed transaction are also more fully discussed in the prospectus included in the registration statement on Form S-4 filed with the Securities and Exchange Commission (the “SEC”) by Olin on June 22, 2015 and the preliminary proxy statement on Schedule 14A filed with the SEC by Olin on June 22, 2015. The forward-looking statements should be considered in light of these factors. In addition, other risks and uncertainties not presently known to Olin or that Olin considers immaterial could affect the accuracy of our forward-looking statements. The reader is cautioned not to rely unduly on these forward-looking statements. Olin and TDCC undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information or otherwise.

Additional Information and Where to Find It

In connection with the proposed combination of Olin with the chlorine products business of The Dow Chemical Company (“TDCC”), Blue Cube Spinco Inc. (“Spinco”) has filed a registration statement on Form S-4 containing a prospectus and Olin has filed a preliminary proxy statement on Schedule 14A and a registration statement on Form S-4 containing a prospectus with the Securities and Exchange Commission (the “SEC”). Both Olin and Spinco expect to file amendments to these filings before they become effective. INVESTORS AND SECURITYHOLDERS ARE ADVISED TO READ THE REGISTRATION STATEMENTS/PROSPECTUSES AND PRELIMINARY PROXY STATEMENT AND ANY FURTHER AMENDMENTS WHEN THEY BECOME AVAILABLE AS WELL AS ANY OTHER RELEVANT DOCUMENTS WHEN THEY BECOME AVAILABLE, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT OLIN, TDCC, SPINCO AND THE PROPOSED TRANSACTION. Investors and securityholders may obtain a free copy of the registration statements/prospectuses and preliminary proxy statement and any further amendments (when available) and other documents filed by Olin, TDCC and Spinco with the SEC at the SEC’s website at http://www.sec.gov. Free copies of these documents and any further amendments, once available, and each of the companies’ other filings with the SEC, may also be obtained from the respective companies by directing a request to Olin at Olin Corporation, ATTN: Investor Relations, 190 Carondelet Plaza, Suite 1530, Clayton, Missouri 63105 or TDCC or Spinco at The Dow Chemical Company, 2030 Dow Center, Midland, Michigan 48674, ATTN: Investor Relations, as applicable.

Non-Solicitation

This communication 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, 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.

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