X0202 5 2007-12-31 1 0 1 0000830141 PIONEER COMPANIES INC PONR 0001312908 Gates Capital Management, Inc. 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 0001394281 Gates Capital Partners, L.P. 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 0001394416 Gates Jeffrey L 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 0001361105 ECF VALUE FUND L P 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 0001270166 ECF VALUE FUND II LP 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 0001221469 ECF VALUE FUND INTERNATIONAL LTD 1177 AVENUE OF THE AMERICAS 32ND FLOOR NEW YORK NY 10036 0 0 1 0 Common Stock 2007-08-31 4 U 0 L 1721208 35.00 D 0 I Investment Manager, see remarks above Gates Capital Management, Inc., which is controlled by Jeffrey L. Gates, is the general partner of Gates Capital Partners, L.P., which is the general partner of ECF Value Fund, L.P. and ECF Value Fund II, L.P. and thereby is solely responsible for the trading and investment decisions of ECF Value Fund, L.P. and ECF Value Fund II, L.P. Gates Capital Management, Inc. is also the investment manager of ECF Value Fund International, Ltd. and thereby is solely responsible for the trading and investment decisions of ECF Value Fund International, Ltd. The following persons shall be considered to be Reporting Persons for purposes of this Form: Gates Capital Management, Inc., Gates Capital Partners, L.P., Jeffrey L. Gates, ECF Value Fund, L.P., ECF Value Fund II, L.P. and ECF Value Fund International, Ltd. For purposes of this Form, the securities reported herein are deemed to be beneficially owned collectively by the Reporting Persons. These shares were disposed of pursuant to a merger agreement between the issuer and Olin Corporation in exchange for cash in the amount of $35.00 per share (which $35.00 represents the merger consideration payable per share of common stock pursuant to the merger agreement). The issuer's stated fiscal year-end was 12/31/07 (see Form 10-K dated 3/14/07); however, as of 8/31/07, the issuer was acquired by Olin Corporation pursuant to the aforementioned merger agreement. Gates Capital Management, Inc. Gates Capital Partners, L.P. Jeffrey L. Gates ECF Value Fund, L.P. ECF Value Fund II, L.P. ECF Value Fund International Ltd. By: Jeffrey L. Gates, President, Gates Capital Management, Inc., an authorized person 2008-02-14