Company: TCPA
Filing Date: 2025-10-10
Form Type: 8-A12B
Source: 0001193125-25-237110
Chunk: 0

Company: TRANSCANADA PIPELINES LTD
Filing Date: 2025-10-10
Form: 8-A12B
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 TRANSCANADA PIPELINES LIMITED (Exact name of registrant as specified in its charter) CANADA (State or other jurisdiction of incorporation or organization) 52-2179728 (I.R.S. Employer Identification No.) TransCanada Tower, 450 – 1 Street S.W., Calgary, Alberta, Canada T2P 5H1 (Address of Principal Executive Offices of Each Registrant and Zip Code)

| If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), please check the following box. ☒ |     | If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), please check the following box. ☐ |

Securities Act registration statement file numbers to which this form relates: 333-283633 Securities to be registered pursuant to Section 12(b) of the Act:

| Title of Each Class                       
 to be so Registered                       |     | Name of Each Exchange on Which 
 Each Class is to be Registered |
| 6.250% Junior Subordinated Notes due 2085 |     | New York Stock Exchange, Inc.  |

Securities to be registered pursuant to Section 12(g) of the Act: None. (Title of class)

Item 1. Description of Registrants’ Securities to be Registered. The class of securities to be registered hereby is the 6.250% Junior Subordinated Notes due 2085 (“Subordinated Notes”) of TransCanada PipeLines Limited, a corporation organized under the laws of Canada (the “Company”). The Subordinated Notes are being issued under an Amended and Restated Subordinated Debt Indenture, dated as of November 30, 2000, between the Company and Computershare Trust Company, N.A. (as successor to The Bank of Nova Scotia Trust Company of New York), as trustee, as supplemented by a Third Supplemental Subordinated Indenture, dated as of October 9, 2025. A description of the Subordinated Notes is set forth (i) under