EXHIBIT 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), relating to the Class A ordinary shares of Supernova Partners Acquisition Company III, Ltd., a Cayman Islands exempted company, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934, as amended, on behalf of each of the undersigned.
This Agreement may be executed in counterparts and each of such counterparts taken together shall constitute one and the same instrument.
Dated this 5th day of April, 2021.
| CITADEL SECURITIES LLC | CITADEL ADVISORS LLC | |||
| By: | /s/ Guy Miller | By: | /s/ Gregory Johnson | |
| Guy Miller, Authorized Signatory | Gregory Johnson, Authorized Signatory | |||
| CALC IV LP | CITADEL ADVISORS HOLDINGS LP | |||
| By: | /s/ Guy Miller | By: | /s/ Gregory Johnson | |
| Guy Miller, Authorized Signatory | Gregory Johnson, Authorized Signatory | |||
| CITADEL SECURITIES GP LLC | CITADEL GP LLC | |||
| By: | /s/ Guy Miller | By: | /s/ Gregory Johnson | |
| Guy Miller, Authorized Signatory | Gregory Johnson, Authorized Signatory | |||
| KENNETH GRIFFIN | ||||
| By: | /s/ Gregory Johnson | |||
| Gregory Johnson, attorney-in-fact* | ||||
| * | Gregory Johnson is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Jaws Acquisitions Corp. on February 1, 2021. |