Company: HCWB
Filing Date: 2025-04-28
Form Type: DEFA14A
Source: 0000950170-25-058980
Chunk: 0

Company: HCW Biologics Inc.
Filing Date: 2025-04-28
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
(Amendment No. )

| 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                                           |

HCW BIOLOGICS INC. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

| Payment of Filing Fee (Check the appropriate box): |                                                                                                      |
| ☒                                                  | No fee required.                                                                                     |
| ☐                                                  | Fee paid previously with preliminary materials.                                                      |
| ☐                                                  | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

Your Vote Counts! HCW BIOLOGICS INC. 2025 Annual Meeting Vote by June 16, 2025 11:59 PM ET V73226-P31049 You invested in HCW BIOLOGICS INC. and it’s time to vote!

You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 17, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 3, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you