Company: HCWB
Filing Date: 2025-04-28
Form Type: DRS
Source: 0000950123-25-003769
Chunk: 121

Company: HCW Biologics Inc.
Filing Date: 2025-04-28
Form: DRS
Chunk 121
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 maintained by the non-U.S. Holder); |

| • |     | the non-U.S. Holder is an individual who is present in the United States for 183 days or more in the taxable year 
 of disposition and certain other conditions are met; or                                                           |

Gain described in the first bullet point above will be subject to tax at generally applicable U.S. federal income tax rates. Any gains described in the first bullet point above of a non-U.S. Holder that is a foreign corporation may also be subject to an additional “branch profits tax” at a 30% rate (or lower applicable treaty rate). Gain described in the second bullet point above will generally be subject to a 30% U.S. federal income tax. Non-U.S. Holders are urged to consult their tax advisors regarding possible eligibility for benefits under income tax treaties. If the third bullet point above applies to a non-U.S. Holder, gain recognized by such non-U.S. holder on the sale, exchange or other disposition of our Common Stock will be subject to tax at generally applicable U.S. federal income tax rates. In addition, if our stock is not regularly traded on an established securities market for this purpose, a buyer of our Common Stock from such non-U.S. Holder may be required to withhold U.S. income tax at a rate of 15% of the amount realized upon such disposition. We will be classified as a United States real property holding corporation if the fair market value of our “United States real property interests” equals or exceeds 50% of the sum of the fair market value of our worldwide real property interests plus our other assets used or held for use in a trade or business, as determined for U.S. federal income tax purposes. We believe that we currently are, and expect to remain for the foreseeable future, a United States real property holding corporation. Non-U.S. Holders are urged to consult their tax advisors regarding the application of these rules. Additional U.S. Federal Tax Considerations Additional Tax on Net Investment Income In addition to regular U.S. federal income tax, certain U.S. Holders that are individuals, estates or trusts are subject to a 3.8% tax on all or a portion of their “net investment income,” which may include all or a portion of their net gain from the sale, exchange or other disposition of Common Stock, or dividends with respect to Common Stock. Each U.S. Holder is urged to consult its own tax advisor regarding the application of this tax. Backup Withholding and Additional