SCHEDULE 13D/A 0000807249-21-000188 0000807249 XXXXXXXX LIVE 18 Class A common and Class B variable voting shares, no par value per share 03/11/2025 false 0001845840 879512309 Telesat Corp

160 ELGIN ST 160 ELGIN ST OTTAWA A6 K2P 2P7

DAVID GOLDMAN 9149215000 GAMCO INVESTORS, INC. ONE CORPORATE CENTER RYE NY 10580 0000807249 N GAMCO INVESTORS, INC. ET AL WC N NY 1200.00 0.00 1200.00 0.00 1200.00 Y 0.0 CO HC 0001081407 N GABELLI FUNDS LLC OO N NY 729979.00 0.00 729979.00 0.00 729979.00 N 5.2 CO IA 0001460612 N GAMCO Asset Management Inc. OO N NY 1759388.00 0.00 1812488.00 0.00 1812488.00 N 13.0 CO IA 0000932724 N GABELLI & Co INVESTMENT ADVISERS, INC. OO N DE 75911.00 0.00 75911.00 0.00 75911.00 N 0.5 CO IA Y GABELLI FOUNDATION, INC. WC N NV 59000.00 0.00 59000.00 0.00 59000.00 N 0.4 OO Y MJG ASSOCIATES, INC. OO N CT 14300.00 0.00 14300.00 0.00 14300.00 N 0.1 CO 0001238894 N GGCP, INC. WC N WY 10000.00 0.00 10000.00 0.00 10000.00 Y 0.1 CO HC 0001642122 N Associated Capital Group, Inc. WC N NY 9900.00 0.00 9900.00 0.00 9900.00 Y 0.1 CO HC 0001185533 N GABELLI MARIO J PF N X1 0.00 0.00 0.00 0.00 0.00 Y 0.0 IN Class A common and Class B variable voting shares, no par value per share Telesat Corp 160 ELGIN ST 160 ELGIN ST OTTAWA A6 K2P 2P7 This statement is being filed by one or more of the following persons: GGCP, Inc. (GGCP), GGCP Holdings LLC (GGCP Holdings), GAMCO Investors, Inc. (GBL), Associated Capital Group, Inc. (AC), Gabelli Funds, LLC (Gabelli Funds), GAMCO Asset Management Inc. (GAMCO), Teton Advisors, LLC (Teton Advisors), Keeley-Teton Advisors, LLC (Keeley-Teton), Gabelli & Company Investment Advisers, Inc. (GCIA), Morgan Group Holding Co., (MGH), G.research, LLC (G.research), MJG Associates, Inc. (MJG Associates), Gabelli Securities International (Bermuda) Limited (GSIL), Gabelli Foundation, Inc. (Foundation), Mario Gabelli, LICT and CIBL. Those of the foregoing persons signing this Schedule 13D are hereinafter referred to as the Reporting Persons. GAMCO is a New York corporation and GBL and MGH are Delaware corporations, each having its principal business office at One Corporate Center, Rye, New York 10580. GGCP is a Wyoming corporation and AC and GCIA are Delaware corporations each having its principal business office 191 Mason Street, Greenwich, CT 06830. GGCP Holdings is a Delaware limited liability corporation having its principal business office at 191 Mason Street, Greenwich, CT 06830. G.research is a Delaware limited liability company having its principal officers at One Corporate Center, Rye, New York 10580. Gabelli Funds is a New York limited liability company having its principal business office at One Corporate Center, Rye, New York 10580. Teton Advisors is a Delaware limited liability company having its principal place of business at 189 Mason Street, Greenwich, CT 06830. Keeley-Teton Advisors is a Delaware limited liability company having its principal place of business at 141 W. Jackson Blvd., Chicago, IL 60604. MJG Associates is a Connecticut corporation having its principal business office at 191 Mason Street, Greenwich, CT 06830. The Foundation is a Nevada corporation having its principal offices at 165 West Liberty Street, Reno, Nevada 89501. LICT is a Delaware corporation having its principal place of business as 401 Theodore Fremd Avenue, Rye, New York 10580. CIBL, Inc. is a Delaware corporation having its principal place of business as 165 West Liberty Street, Suite 220, Reno, NV 89501. Not applicable. Not applicable. United States. The aggregate number of Securities to which this Schedule 13D relates is 2,712,778 shares, representing 19.46% of the 13,940,086 shares outstanding as reported by the Issuer as of September 30, 2024. The Reporting Persons beneficially own those Securities as follows: AC 9,900 shares 0.07%, GCIA 75,911 shares 0.54%, Foundation 59,000 shares 0.42%, Funds 729,979 shares 5.24%, GAMCO 1,812,488 shares 13.00%, GBL 1,200 shares 0.01%, GGCP 10,000 shares 0.07% and MJG Associates 14,300 shares 0.10%. Each of the Reporting Persons and Covered Persons has the sole power to vote or direct the vote and sole power to dispose or to direct the disposition of the Securities reported for it, either for its own benefit or for the benefit of its investment clients or its partners, as the case may be, except that (i) GAMCO does not have authority to vote 53,100 of the reported shares, (ii) Gabelli Funds has sole dispositive and voting power with respect to the shares of the Issuer held by the Funds so long as the aggregate voting interest of all joint filers does not exceed 25% of their total voting interest in the Issuer and, in that event, the Proxy Voting Committee of each Fund shall respectively vote that Funds shares, (iii) at any time, the Proxy Voting Committee of each such Fund may take and exercise in its sole discretion the entire voting power with respect to the shares held by such fund under special circumstances such as regulatory considerations, and (iv) the power of Mario Gabelli, AC, GBL, and GGCP is indirect with respect to Securities beneficially owned directly by other Reporting Persons. Information with respect to all transactions in the Securities which were effected during the past sixty days or since the most recent filing on Schedule 13D, whichever is less, by each of the Reporting Persons and Covered Persons is set forth below: DATE SHARES PURCHASED PRICE /SOLD ASSOCIATED CAPITAL GROUP, INC. 2/26/2025 -500 18.3044 2/24/2025 -500 18.2626 GABELLI & COMPANY INVESTMENT ADVISERS, INC GABELLI ASSOCIATES FUND II 2/14/2025 -100 22.8721 2/13/2025 -150 23.0010 2/12/2025 -100 21.7744 2/10/2025 -200 20.6804 1/30/2025 -200 19.4507 GABELLI ASSOCIATES FUND 2/14/2025 -350 22.8721 2/13/2025 -350 23.0010 2/12/2025 -350 21.7744 2/10/2025 -550 20.6804 1/30/2025 -1,300 19.4507 1/22/2025 -200 18.2931 GABELLI ASSOCIATES LIMITED II E 2/14/2025 -200 22.8721 2/13/2025 -250 23.0010 2/12/2025 -200 21.7744 2/10/2025 -700 20.6804 1/30/2025 -850 19.4507 1/22/2025 -200 18.2931 GABELLI ASSOCIATES LIMITED 2/14/2025 -700 22.8721 2/13/2025 -650 23.0010 2/12/2025 -700 21.7744 2/10/2025 -950 20.6804 1/30/2025 -300 19.4507 GABELLI FUNDS, LLC GABELLI EQUITY INCOME FUND 3/10/2025 -500 17.8200 1/28/2025 -500 16.9960 GABELLI ENTERPRISE M&A FUND 2/14/2025 -1,500 23.0327 GAMCO MERGER ARBITRAGE UCITS 2/14/2025 -950 22.8721 2/13/2025 -950 23.0010 2/12/2025 -950 21.7744 2/10/2025 -855 20.6804 1/30/2025 -5,871 19.4507 1/22/2025 -4,500 18.2931 GABELLI MULTIMEDIA TRUST 3/3/2025 1,405 16.1500 2/28/2025 195 17.6073 1/29/2025 -2,000 17.4876 GABELLI GLOBAL SMALL & MIDCAP VALUE TRUST 1/28/2025 1,000 17.0700 GABELLI GLOBAL UTILITY & INCOME TRUST 2/24/2025 -1,500 18.3569 2/11/2025 -500 21.2320 GABELLI MERGER PLUS+ TRUST 2/14/2025 -200 22.8721 2/13/2025 -150 23.0010 2/12/2025 -200 21.7744 2/10/2025 -250 20.6804 1/30/2025 -650 19.4507 1/22/2025 -100 18.2931 GABELLI SMALL CAP GROWTH FUND 1/13/2025 -700 15.7172 GABELLI UTILITIES FUND 2/13/2025 -2,200 22.4500 2/11/2025 -800 21.0300 1/15/2025 -1,200 14.9963 1/13/2025 -300 16.0000 GAMCO ASSET MANAGEMENT INC. 3/11/2025 -6,000 20.2518 3/10/2025 150 17.1580 3/7/2025 -1,000 17.5860 3/6/2025 -200 17.3000 3/6/2025 -700 17.5900 3/5/2025 -5,800 16.6784 2/27/2025 -200 17.6891 2/25/2025 -13,000 18.3044 2/24/2025 -500 18.5222 2/21/2025 1,372 19.1117 2/19/2025 -1,500 20.6167 2/19/2025 -300 21.2067 2/18/2025 350 21.6500 2/18/2025 -500 22.1265 2/13/2025 -900 22.8261 2/12/2025 -600 21.4603 2/11/2025 -300 21.1000 2/10/2025 -200 20.4500 2/6/2025 -2,027 19.9230 2/5/2025 -2,173 19.6327 2/4/2025 150 18.8886 1/31/2025 -2,000 18.8545 1/31/2025 -500 18.9200 1/30/2025 -1,200 18.9392 1/28/2025 228 16.9500 1/27/2025 -500 17.3550 1/21/2025 -2,731 17.1240 1/17/2025 -1,554 16.2640 1/16/2025 700 15.9730 1/16/2025 -2,000 16.0530 1/14/2025 -1,300 15.0031 MJG ASSOCIATES, INC. GABELLI INTERNATIONAL LIMITED 3/11/2025 -3,200 21.2448 2/11/2025 -400 21.2500 2/10/2025 -400 20.5562 2/6/2025 -600 19.7400 2/4/2025 -600 19.0700 1/30/2025 -800 19.3362 GABELLI FUND, LDC 1/15/2025 -300 14.9000 The investment advisory clients of, or partnerships managed by, GAMCO, Gabelli Funds, Teton Advisors and MJG Associates have the sole right to receive and, subject to the notice, withdrawal and/or termination provisions of such advisory contracts and partnership arrangements, the sole power to direct the receipt of dividends from, and the proceeds of sale of, any of the Securities beneficially owned by such Reporting Persons on behalf of such clients or partnerships. Except as noted, no such client or partnership has an interest by virtue of such relationship that relates to more than 5% of the Securities. Not applicable. GAMCO INVESTORS, INC. ET AL PETER D. GOLDSTEIN 03/12/2025 GABELLI FUNDS LLC DAVID GOLDMAN 03/12/2025 GAMCO Asset Management Inc. DOUGLAS R. JAMIESON 03/12/2025 GABELLI & Co INVESTMENT ADVISERS, INC. DOUGLAS R. JAMIESON 03/12/2025 GABELLI FOUNDATION, INC. DAVID GOLDMAN 03/12/2025 MJG ASSOCIATES, INC. DAVID GOLDMAN 03/12/2025 GGCP, INC. DAVID GOLDMAN 03/12/2025 Associated Capital Group, Inc. DOUGLAS R. JAMIESON 03/12/2025 GABELLI MARIO J DAVID GOLDMAN 03/12/2025