EXHIBIT 99.1
Published on May 13, 2026
EXHIBIT 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that the statement on Schedule 13G with respect to the Shares of BLACK SPADE ACQUISITION III CO. dated as of March 31, 2026 is, and any amendments thereto (including amendments on Schedule 13G) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the previsions of Rule13d-1(k) under the Securities Exchange Act of 1934, as amended.
| Date: May 13, 2026 | magnetar financial llc | |
| By: | Magnetar Capital Partners LP, its Sole Member | |
| By: | /s/ Hayley Stein | |
| Name: | Hayley Stein | |
| Title: | Attorney-in-fact for David J. Snyderman, Administrative Manager of Supernova Management LLC | |
| Date: May 13, 2026 | magnetar capital partners LP | |
| By: | Supernova Management LLC, its General Partner | |
| By: | /s/ Hayley Stein | |
| Name: | Hayley Stein | |
| Title: | Attorney-in-fact for David J. Snyderman, Administrative Manager of Supernova Management LLC | |
| Date: May 13, 2026 | supernova management llc | |
| By: | /s/ Hayley Stein | |
| Name: | Hayley Stein | |
| Title: | Attorney-in-fact for David J. Snyderman, Administrative Manager | |
| Date: May 13, 2026 | DAVID J. SNYDERMAN | |
| By: | /s/ Hayley Stein | |
| Name: | Hayley Stein | |
| Title: | Attorney-in-fact for David J. Snyderman | |