Pioneer Announces Convertibility of 2.75% Convertible Senior Subordinated Notes Due 2027


HOUSTON, Aug. 31, 2007 (PRIME NEWSWIRE) -- Pioneer Companies, Inc. (Nasdaq:PONR) announced today that it has mailed to the holders of its $120 million in aggregate principal amount of 2.75% Convertible Senior Subordinated Notes due 2027, a Notice of Convertibility required by Section 15.01(c) of the related indenture dated March 26, 2007. The Notice of Convertibility provides as follows:


                       PIONEER COMPANIES, INC.
         2.75% CONVERTIBLE SENIOR SUBORDINATED NOTES DUE 2027
                 CUSIP NUMBERS: 723643 AA0, 723643 AC6

                       NOTICE OF CONVERTIBILITY

      Pioneer Companies, Inc., a Delaware corporation (the "Company"),
 has issued 2.75% Convertible Senior Subordinated Notes due 2027
 pursuant to an Indenture, dated as of March 26, 2007 (the
 "Indenture"), between the Company and Wells Fargo Bank, National
 Association, as trustee. Capitalized terms not defined herein have
 the meanings assigned to such terms in the Indenture.

      The Company hereby gives notice to all record holders of the
 Notes pursuant to Section 15.01(c) of the Indenture, of the
 occurrence of a Fundamental Change resulting from the closing of the
 transactions contemplated by the Agreement and Plan of Merger dated
 May 20, 2007, among the Company, Olin Corporation and Princeton
 Merger Corp. ("Merger Sub"), pursuant to which Merger Sub has been
 merged with and into the Company and each outstanding share of common
 stock of the Company has been converted into the right to receive $35
 per share in cash, effective as of August 31, 2007 (the "Merger").

      As a result of the Merger, until the Designated Event Repurchase
 Date set forth in the Company Repurchase Notice (which Company
 Repurchase Notice will be delivered by Pioneer on or before the 10th
 Business Day after the Merger), the Notes are convertible into cash
 in the amount of $1,218.83 per $1,000 principal amount of Notes and
 thereafter, at any time during which the conditions of Article 15 of
 the Indenture are met, the Notes are convertible into cash in an
 amount equal to $991.28 per $1,000 principal amount of Notes. The
 Designated Event Repurchase Date will be designated by Pioneer on or
 before September 17, 2007 and will be a Business Day which is not
 less than 20 Business Days nor more than 35 Business Days after the
 date of the Company Repurchase Notice related to the Merger.

      In order to exercise the conversion right with respect to any
 Note in certificated form, the Company must receive at the office or
 agency of the Company maintained for that purpose, or at the option
 of such holder, the Corporate Trust Office, such Note with the
 original or facsimile of the form entitled "Conversion Notice" on the
 reverse thereof, duly completed and manually signed, together with
 such Notes duly endorsed for transfer, accompanied by the funds, if
 any, required by Section 15.02 of the Indenture.

      In order to exercise the conversion right with respect to any
 interest in a Global Note, the beneficial holder must complete, or
 cause to be completed, the appropriate instruction form for
 conversion pursuant to the Depositary's book-entry conversion
 program; deliver, or cause to be delivered, by book-entry delivery an
 interest in such Global Note; furnish appropriate endorsements and
 transfer documents if required by the Company or the Trustee or
 conversion agent; and pay the funds, if any, required by Section
 15.02 of the Indenture.

                                   PIONEER COMPANIES, INC.

                                   By: /s/ George H. Pain
                                   --------------------------------
                                   Name: George H. Pain
                                   Title: Vice President and Secretary
 Date: August 31, 2007


            

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