Company: ABUS
Filing Date: 2025-04-04
Form Type: DEFA14A
Source: 0001140361-25-012307
Chunk: 0

Company: Arbutus Biopharma Corp
Filing Date: 2025-04-04
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

| Filed by the Registrant ☒ | ​ | ​ | Filed by a Party other than the Registrant☐ |

Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by 
 Rule 14a-6(e)(2))                                             |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under §240.14a-12 |

| ARBUTUS BIOPHARMA CORPORATION                                            |
| (Name of Registrant as Specified in its Charter)                         |
| (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant) |

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