Exhibit 99.1 TELESAT CORPORATION Quarterly Report For the Three and Nine Month Periods Ended September 30, 2023 PART I. FINANCIAL INFORMATION Item 1. Financial Statements 1 Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations 26 Item 3. Quantitative and Qualitative Disclosures About Market Risk 55 PART II. OTHER INFORMATION Item 1. Legal Proceedings 56 Item 1A. Risk Factors 56 Item 2. Unregistered Sales of Equity Securities and Use of Proceeds 56 Item 3. Defaults Upo ...