Company: IMCR
Filing Date: 2025-03-17
Form Type: POSASR
Source: 0001140361-25-008914
Chunk: 0

Company: Immunocore Holdings plc
Filing Date: 2025-03-17
Form: POSASR
Chunk 0
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As filed with the Securities and Exchange Commission on March 17, 2025 Registration No. 333-278120 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO Form S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Immunocore Holdings plc (Exact name of registrant as specified in its charter)

| England and Wales                                              |     | Not Applicable                         |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification Number |

92 Park Drive, Milton Park Abingdon, Oxfordshire OX14 4RY United Kingdom +44 1235 438600 (Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices) Immunocore, LLC Six Tower Bridge, Suite 200 181 Washington Street Conshohocken, Pennsylvania 19428 United States +1 484 534 5261 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies of all communications, including communications sent to agent for service, should be sent to:

| Divakar Gupta            
 Courtney T. Thorne       
 Cooley LLP               
 55 Hudson Yards          
 New York, New York 10001 
 +1 212 479 6000          |     | Claire Keast-Butler 
 Cooley (UK) LLP     
 22 Bishopsgate      
 London EC2N 4BQ     
 United Kingdom      
 +44 20 7583 4055    |

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:From time to time after the effective date of this registration statement. If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐ If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒ If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ If this Form is a