Coorstek Inc Watch

from SC 13G/A 1 page Joint Acquisition Statement

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Coorstek Inc Mjg Associates, Inc. 3/18/03 2,400- 26.0000 Gabelli International Ltd 3/18/03 17,000- 26.0000 Gabelli Fund, Ldc 3/18/03 3,000- 26.0000 Gabelli Securities, Inc. 3/18/03 9,000- 26.0000 Gabelli Associates Ltd 3/18/03 274,941- 26.0000 Gaf II 3/18/03 5,000- 26.0000 Gabelli Associates Fund 3/18/03 340,768- 26.0000 3/14/03 5,140 25.8421 3/14/03 5,000 25.8500 3/12/03 5,000 25.8300 Gamco Investors, Inc. 3/18/03 106,200- 26.0000 3/18/03 230,987- 26.0000 3/14/03 3,000 25.8421 3/11/03 6,200 25.8300 Gabelli Funds, LLC. Gabelli Abc Fund 3/18/03 80,000- 26.0000 (1) the Dispositions Effected on 3/18/03 Were in Connection With the Acquisition Described in Item 5(a) of This Amendment to Schedule 13d. All Other Transactions Were Effected on the NASDAQ National Market. (2) Price Excludes Commission

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Coorstek Inc Gabelli Securities, Inc. 2/24/03 1,000 25.7000 2/13/03 1,000 25.7000 Gabelli Associates Ltd 2/24/03 9,000 25.7000 2/13/03 29,000 25.7000 Gaf II 2/24/03 1,000 25.7000 Gabelli Associates Fund 2/24/03 11,100 25.7000 2/13/03 33,600 25.7000 2/04/03 21,400 25.7000 Mjg Associates, Inc. Gabelli International Ltd 2/04/03 7,000 25.7000 Gamco Investors, Inc. 2/24/03 59,300 25.7703 2/24/03 10,700 25.7721 2/24/03 15,000 25.7703 2/24/03 6,000 25.7000 2/13/03 17,000 25.7000 2/10/03 7,700 25.6500 2/04/03 7,000- 25.7000 Gabelli Funds, LLC. Gabelli Abc Fund 2/12/03 3,500 25.6200 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ National Market. (2) Price Excludes Commission

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Coorstek Inc Mjg Associates, Inc. Gabelli International Ltd 2/04/03 10,000 25.7000 Gamco Investors, Inc. 2/04/03 20,000 25.7000 2/04/03 51,900 25.7000 Gabelli Securities, Inc. Gabelli Associates Ltd 2/04/03 25,000 25.7000 Gabelli Associates Fund 2/04/03 21,400 25.7000 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ National Market. (2) Price Excludes Commission

from SC 13G/A ~1 page Joint Acquisition Statement

from SC 13E3/A 1 page This Waiver (This "Waiver") Is Made and Entered Into as of January 9, 2003 by and Among Coorstek, Inc., a Delaware Corporation (The "Company"), Keystone Holdings LLC, a Delaware Limited Liability Company ("Parent"), and Keystone Acquisition Corp., a Delaware Corporation ("Purchaser")

from SC 13E3 23 pages Investment Banking Division Presentation to Keystone Holdings LLC Confidential December 11, 2002

from SC 13E3 16 pages McDonald Investments Presentation For: Project Keystone November 8, 2002

from SC 13E3 35 pages McDonald Investments Presentation For: Project Keystone October 30, 2002

from SC 13E3 54 pages Banc of America Securities Provides Investment Banking and Securities Products Domestically And, on a Limited Basis, Offshore. Other Products and Services, Including Products and Services That May Be Referenced in the Accompanying Materials, May Be Provided Through Affiliates of Banc of America Securities. Copyright 2002 Banc of America Securities LLC. Banc of America Securities LLC, Member NYSE/Nasd/Sipc, Is a Subsidiary of Bank of America Corporation. Materials Prepared for the Evaluation Committee of the Board of Directors December 22, 2002

from SC 13E3 1 page November 23, 2002 Board of Directors Coorstek, Inc. 16000 Table Mountain Parkway Golden, Co 80403 Members of the Board of Directors

from SC 13E3 63 pages Materials Prepared for Discussion November 23, 2002

from S-3/A 32 pages 2,500,000 Shares Coorstek, Inc. Common Stock Underwriting Agreement Dated May [ ], 2002

from SC 13G ~1 page Joint Acquisitions

from S-1/A ~50 pages Underwriting Agreement