Telesat Corporation: 5%+ holders

As of November 8, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Telesat Corporation. The largest reported stake is Mhr Fund Management LLC's, at 35.5%. 6 filings are on record since August 14, 2025 (Schedule 13D/A, July 9, 2026).

MHR INSTITUTIONAL ADVISORS LLC also filed stake reports on 1 other company ↓

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Key facts

• Filing 2026-08-14 · Reporting person: Rubric Capital Management LP · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
• Filing 2026-07-09 · Reporting person: Mhr Institutional Advisors LLC · Sole voting: 2,634,891 · Shared voting: 0 · Sole dispositive: 2,634,891 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-07-09
• Filed 2026-05-15 · Holder: Heard Capital LLC · Percent: 4.16% · SCHEDULE 13G/A
• Filed 2026-04-02 · Holder: Gamco Investors, Inc. Et Al · Percent: 11.6% · SCHEDULE 13D/A
• Filed 2026-02-17 · Holder: Heard Capital LLC · Percent: 8.37% · SCHEDULE 13G/A

Telesat Corporation has 6 Schedule 13D or 13G filings on record since 2025-08-14. 2 holders' latest filing reports 5% or more of class a common shares and class b variable voting shares, no par value per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on Telesat Corporation and the records around it.

Telesat Corporation elsewhere on the record

• Who owns it

Companies that share a holder

• MHR INSTITUTIONAL ADVISORS LLC also filed stake reports on 1 other company: Lionsgate Studios Corp. (Jul 2026)
• Rubric Capital Management LP also filed stake reports on 32 other companies: ARDELYX, INC. (Aug 2026), Enovis Corporation (Aug 2026), MeiraGTx Holdings plc (Aug 2026)
• GAMCO INVESTORS, INC. ET AL also filed stake reports on 45 other companies: NATHANS FAMOUS, INC. (Oct 2026), BEASLEY BROADCAST GROUP INC (Oct 2026), TENNANT CO (Sep 2026)

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Voting and dispositive power, as filed

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The latest filing identifies Telesat Corporation by CUSIP 879512309 and gives its principal executive office as 160 Elgin Street, Suite 2100, Ottawa (SCHEDULE 13G/A, 2026-08-14).

Purpose of Transaction (Item 4)

Gamco Investors, Inc. Et Al

The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.Item 4 of the SCHEDULE 13D/A filed 2026-04-02

Mhr Fund Management LLC

Item 4 is hereby amended and restated as follows. All of the Class B Shares reported on this Schedule 13D were acquired for investment purposes. The Reporting Persons intend to review their holdings in the Issuer on a continuing basis and as part of this ongoing review evaluate various alternatives that are or may become available with respect to the Issuer and its securities. Except as otherwise set forth in this Schedule 13D, neither the Reporting Persons nor, to the best of their knowledge, any of the other persons identified in response to Item 2 hereof, has any plans or proposals that relate to or would result in the occurrence of any of the transactions described in subparagraphs (b) through (j) of Item 4 of Schedule 13D. (a) The Reporting Persons may from time to time and at any time (in accordance with any trading policy of the Issuer or its subsidiaries and affiliates that may then be applicable to the Reporting Persons) in their sole discretion acquire, or cause to be acquired, additional equity or debt securities or other instruments of the Issuer, its subsidiaries or affiliates, or dispose, or cause to be disposed, such equity or debt securities or instruments, in any amount that the Reporting Persons may determine in their sole discretion, through public or private transactions or otherwise. The Reporting Persons reserve the right to and may, from time to time and at any time, in their sole discretion, formulate and implement other purposes, plans or …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-07-09; the filing has the rest

Timeline

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Questions about who owns Telesat Corporation

Who owns Telesat Corporation?

On this page, 2 holders' latest ownership filings report 5% or more of Telesat Corporation: Mhr Fund Management LLC (35.5%, Schedule 13D/A, filed 2026-07-09) and Gamco Investors, Inc. Et Al (11.6%, Schedule 13D/A, filed 2026-04-02).

Who are the largest shareholders of Telesat Corporation?

By the share each holder's latest filing reports, the largest holders of Telesat Corporation on this page are Mhr Fund Management LLC (35.5%) and Gamco Investors, Inc. Et Al (11.6%).

When did Mhr Fund Management LLC buy into Telesat Corporation?

The filings give report dates, not purchase dates. The earliest filing from Mhr Fund Management LLC on this page is the Schedule 13D/A, filed 2026-07-09, reporting 35.5%. That earliest filing is itself an amendment, which updates an earlier report.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 6 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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