Arch Chemicals Inc. (ARJ)

Basic Materials: Synthetics

As of September 30, 2011
Closing price on 09/30/2011:
$46.92
Filers who had this stock in their top 10:
10
13F Filers holding this stock:
134
Aggregate shares on 09/30/2011:
20,704,070
Aggregate shares on 06/30/2011:
22,898,909
Percent change:
-9.584906%

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Schedule 13D and 13G filings submitted since 09/30/2011

Filing Company Date of
Filing		 Total Reported
Shares Owned		 Shares Reported
on 13F
SC 13D GAMCO INVESTORS, INC. ET AL 08/05/2011 732,501 525,880
SC 13G/A ALLIANCEBERNSTEIN L.P. 08/10/2011 58,392 40,892
SC 13G/A PRICE T ROWE ASSOCIATES INC /MD/ 09/09/2011 1,200,890 807,950
SC 13D/A GAMCO INVESTORS, INC. ET AL 09/21/2011 1,615,852 525,880
SC 13D/A GAMCO INVESTORS, INC. ET AL 10/19/2011 0 525,880
SC 13D LG ACQUISITION PARENT CORP. 10/21/2011 1,000 0

13F Filers holding this stock

Quarter 1: Quarter 2:
*Shares are split adjusted