EX-99.1

Exhibit 99.1

GigCapital4, Inc. Announces Pricing of Upsized $312,000,000 Initial Public Offering

PALO ALTO, Calif. – February 8, 2021 – GigCapital4, Inc. (NASDAQ: GIGGU) (the “Company” or “GigCapital4”) today announced the pricing of its initial public offering of 31,200,000 units at a price of $10.00 per unit. Each unit consists of one share of common stock and one-third (1/3) of one redeemable warrant of the Company. Each whole warrant entitles the holder to purchase one share of common stock of the Company at a price of $11.50 per share. The units will be listed on the Nasdaq Capital Market (the “NASDAQ”) and are expected to trade under the ticker symbol “GIGGU” beginning Tuesday, February 9, 2021. Once the securities comprising the units begin separate trading, the shares and warrants are expected to be traded on the NASDAQ under the symbols “GIG” and “GIGGW” respectively. The offering is expected to close on February 11, 2021, subject to customary closing conditions.

Oppenheimer & Co. Inc. and Nomura Securities International, Inc. are the joint lead book-running managers for the offering. The managers have a 45-day option to purchase up to an additional 4,680,000 units solely to cover over-allotments, if any.

Registration statements relating to the securities became effective on February 8, 2021. The offering is being made only by means of a prospectus, copies of which may be obtained by contacting Oppenheimer & Co. Inc., Attention: Syndicate Prospectus Department, 85 Broad Street, 26th Floor, New York, New York 10004, by telephone at (212) 667-8055, or by email at EquityProspectus@opco.com and Nomura Securities International, Inc., Attention: Equity Syndicate Department, Worldwide Plaza, 309 West 49th Street, New York, New York 10019-7316, or by telephone at 212-667-9000, or by email at equitysyndicateamericas@nomura.com. Copies of the registration statements can also be accessed through the SEC’s website at www.sec.gov.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Note Concerning Forward Looking Statements

This news release contains statements that constitute “forward-looking statements,” including with respect to the initial public offering and the anticipated use of the net proceeds. No assurance can be given that the offering discussed above will be completed on the terms described, or at all, or that the net proceeds of the offering will be used as indicated. Forward-looking statements are subject to numerous conditions, many of which are beyond the control of the Company, including those set forth in the Risk Factors section of the Company’s registration statement and preliminary prospectus for the Company’s offering filed with the SEC. Copies are available on the SEC’s website, www.sec.gov. The Company undertakes no obligation to update these statements for revisions or changes after the date of this release, except as required by law.

“Private-to-Public Equity (PPE)” and “Mentor-Investor” are trademarks of GigFounders, LLC, a member entity of GigCapital Global and the founder of GigAcquisitions4, LLC, used pursuant to agreement.