UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934

(Amendment No.    )

Filed by the Registrant x

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

x Definitive Additional Materials

¨ Soliciting Material Pursuant to Section 240.14a-12

BlueRiver Acquisition Corp.

(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 all boxes that apply):

x 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.

On July 27, 2023, BlueRiver Acquisition Corp. (the “Company”) determined to postpone the Company’s extraordinary general meeting of its shareholders (the “Special Meeting”) from the previously scheduled date of Friday, July 28, 2023.

The Special Meeting will now be held on Wednesday, August 2, 2023, at 4:00 pm Eastern Time. There is no change to the location, the record date, the purpose or any of the proposals to be acted upon at the Special Meeting. The live-webcast for the Special Meeting will be available by visiting https://www.cstproxy.com/blueriverspac/sm2023.

Holders of the Company’s Class A ordinary shares are entitled to request that the Company redeem all or a portion of their shares for cash in connection with the Special Meeting until Monday, July 31, 2023, at 5:00 pm Eastern Time (two business days prior to the Special Meeting).