Core Molding Technologies Watch

from 8-K 9 pages Core Molding Technologies Reports Results for the 2019 Fourth Quarter and Full Year

from 8-K 3 pages Confidential Release Agreement

from 8-K 2 pages Core Molding Technologies, Inc. First Amendment to Executive Employment Agreement December 30, 2019

from 8-K 8 pages Separation and Release Agreement

from SC 13G/A 1 page Exhibit 1 Joint Filing Agreement

from SC 13G/A 1 page Cusip No. 218683100 Exhibit 1 Joint Filing Agreement

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-Core Molding Technologies, Inc. Gamco Asset Management Inc, 6/01/07 300 7.2399 6/01/07 248,000- *Do 5/24/07 100 7.0500 5/21/07 1,000 7.0500 5/15/07 600 7.0500 5/15/07 600- 7.0500 5/15/07 600 7.0500 5/10/07 2,000 7.9800 5/02/07 500 8.0000 4/20/07 9,800 8.3148 4/19/07 200 7.9500 4/16/07 500 7.4400 4/13/07 8,200 7.3635 4/12/07 800 7.1999 4/11/07 4,000- 7.3070 4/10/07 3,200 7.4000 4/09/07 1,800 7.4000 4/05/07 5,000 7.3976 4/04/07 500 7.4000 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (2) Price Excludes Commission. (*) Results in Change of Dispositive Power and Beneficial Ownership

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-Core Molding Technologies, Inc. Mjg Associates, Inc. Gabelli Performance Partnership 12/14/06 1,200- 9.5358 Gabelli International II Ltd 11/27/06 1,500- 10.2100 Gamco Asset Management Inc. 12/27/06 17,100- 9.2363 12/26/06 900- 9.0500 12/18/06 4,000- 9.3911 12/11/06 5,000- 10.5492 12/05/06 500- 10.5572 11/21/06 500- 8.8902 11/21/06 3,000- 8.8195 Gabelli Advisers, Inc. 12/12/06 2,000- 10.4820 12/01/06 1,000- 10.4010 11/27/06 1,000- 10.2500 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 1/17/07 5,000- 10.0121 1/16/07 5,000- 9.3622 12/06/06 3,000- 10.2383 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Molding Techs Mjg Associates, Inc. Gabelli Performance Partnership 6/06/05 1,500- 11.9033 Gabelli International II Ltd 6/06/05 500- 11.2500 Gamco Investors, Inc. 6/07/05 5,600- 12.8243 6/07/05 27,000- 12.8080 6/07/05 2,000- 12.8525 6/06/05 1,000- 11.9500 6/06/05 21,600- 11.8795 6/03/05 5,500- 10.7764 6/03/05 8,000- 10.6489 Gabelli Advisers, Inc. 6/06/05 2,000- 11.2600 6/03/05 5,000- 10.6468 (1) Unless Otherwise Indicated, All Transactions Were Effected on the AMEX. (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-Core Molding Techs Mjg Associates, Inc. Gabelli Performance Partnership 5/06/05 800- 6.7800 5/03/05 500- 6.4960 Gamco Investors, Inc. 5/31/05 17,000- 8.7855 5/31/05 2,400- 8.8600 5/31/05 6,000- 9.2283 5/27/05 400- 8.6000 5/19/05 9,600- 8.0384 5/18/05 3,000- 7.9543 5/12/05 2,000- 8.3625 5/12/05 5,000- 7.9222 5/11/05 5,000- 7.3850 5/06/05 500- 6.8200 5/05/05 2,000- 6.5232 Gabelli Advisers, Inc. 5/31/05 3,000- 9.2200 5/26/05 5,000- 8.5696 5/23/05 1,800- 8.3900 5/20/05 2,000- 8.3000 5/19/05 3,000- 8.0640 5/12/05 10,500- 8.2557 5/09/05 4,000- 6.8300 5/06/05 1,700- 6.7847 5/05/05 11,000- 6.5319 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 5/19/05 1,800- 7.9200 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NYSE. (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-Core Molding Techs Mjg Associates, Inc. Gabelli Performance Partnership 4/28/05 5,000- 6.3889 Gabelli International Ltd 4/28/05 4,000- 6.3889 4/27/05 3,000- 6.1960 4/26/05 5,000- 6.0620 Gamco Investors, Inc. 4/29/05 17,900- 6.1223 4/28/05 1,000- 6.4800 4/27/05 9,600- 6.0677 4/26/05 5,000- 6.0446 4/21/05 6,600- 5.5856 4/20/05 4,900- 5.6122 4/18/05 8,400- 5.0000 4/15/05 13,000- 5.9712 Gabelli Advisers, Inc. 4/28/05 4,000- 6.4275 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NYSE. (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-Core Molding Technologies Mjg Associates Gabelli International Ltd 4/13/05 3,000- 6.0890 4/08/05 5,300- 6.4264 4/07/05 23,000- 5.8013 4/06/05 4,000- 5.2500 3/29/05 700- 5.5200 3/28/05 2,000- 5.1300 3/23/05 2,000- 5.0205 3/22/05 3,000- 4.2700 Gamco Investors, Inc. 4/13/05 33,100- 5.9711 4/12/05 16,500- 5.5421 4/11/05 900- 5.9000 4/11/05 8,200- 5.9424 4/08/05 9,400 6.4488 4/07/05 2,000 5.9100 4/06/05 200 5.2500 3/30/05 9,600- 4.4890 3/23/05 5,000- 4.6588 3/22/05 8,500- 4.3051 Gabelli Advisers, Inc. 4/13/05 3,100- 6.0113 4/08/05 2,900- 6.5000 4/07/05 2,000- 5.8890 3/22/05 17,000- 4.2158 (1) Unless Otherwise Indicated, All Transactions Were Effected on the AMEX. (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-Core Molding Techs Gamco Investors, Inc. 11/18/04 245,000- *Do 10/15/04 5,500- 2.4080 10/11/04 5,400 2.8500 10/08/04 2,200 2.8482 10/01/04 2,800 2.7057 9/22/04 600 3.1333 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (2) Price Excludes Commission. (*) Results in Change of Dispositive Power and Beneficial Ownership

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-Core Molding Technologies Gamco Investors, Inc. 5/10/04 6,400 3.6013 5/07/04 4,700 3.6374 4/29/04 10,000 3.5145 4/23/04 4,000- 3.8000 4/22/04 2,000- 3.8500 4/19/04 2,000- 3.7650 4/12/04 2,000- 3.9200 4/07/04 29,600 3.9990 3/17/04 5,200 3.8142 Gabelli Advisers, Inc. 4/20/04 1,500- 3.9200 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Molding Techs Gamco Investors, Inc. 1/22/04 14,500 3.5959 1/21/04 800 3.5000 1/20/04 800 3.2138 1/16/04 2,300 3.2613 1/15/04 100 3.3100 1/14/04 2,200 3.2495 1/06/04 2,300 3.0235 1/05/04 11,500 3.0006 1/05/04 8,500 2.9246 1/05/04 6,500 3.0300 12/31/03 6,500 2.9246 12/29/03 1,500 2.9100 12/22/03 27,300 2.8699 12/16/03 5,800 2.9155 12/15/03 7,200 2.9465 Gabelli Advisers, Inc. 12/12/03 1,500 2.8480 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Molding Techs Gamco Investors, Inc. 12/08/03 4,500 2.8944 10/24/03 100- 3.4000 Gabelli Advisers, Inc. 12/02/03 7,000 2.9500 12/01/03 500 2.9500 11/24/03 1,500 3.0000 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Matls Corp Gamco Investors, Inc. 8/26/03 15,000 2.9954 7/24/03 15,000 1.9500 Gabelli Advisers, Inc. 8/28/03 4,600 3.0487 8/21/03 12,000 2.3000 8/18/03 3,400 2.1750 7/28/03 9,700 1.9919 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 7/07/03 1,600 2.0500 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Matls Corp Gamco Investors, Inc. 2/20/03 3,000 1.3000 2/19/03 5,000 1.3000 2/18/03 7,000 1.2856 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 3/28/03 3,200 1.4234 2/20/03 2,200 1.3100 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NYSE. (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-Core Molding Tech Mjg Associates, Inc. Gabelli International Ltd 8/19/02 4,500 1.4078 Gamco Investors, Inc. 10/15/02 40,000 1.0288 10/07/02 5,000 1.2500 9/11/02 5,000 1.4500 9/04/02 4,300 1.5000 9/03/02 2,000 1.5000 8/29/02 1,700 1.4000 8/29/02 3,900 1.4097 8/28/02 1,100 1.4200 8/22/02 14,000 1.4600 8/20/02 3,900 1.4885 Gabelli Advisers, Inc. 10/16/02 8,000 1.0097 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 10/16/02 117,500 1.0097 (1) Unless Otherwise Indicated, All Transactions Were Effected on the American Stock Exchange. (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-Core Materials Corp Gamco Investors, Inc. 7/25/02 15,000 1.2000 6/06/02 1,100 2.1000 6/05/02 3,900 2.0600 5/28/02 200 2.0200 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NYSE. (2) Price Excludes Commission