Stellar discloses three lawsuits and supplemental proxy disclosures for PB merger

Stellar Bancorp, Inc.

Three shareholder lawsuits filed in NY Supreme Court challenging merger disclosure adequacy.
Supplemental proxy includes details on talks with Company B, C, D from Sept–Nov 2025.
KBW fee estimated at ~$23.8M; prior $500K from Prosperity for American Bank Holding deal.
Stellar and Prosperity deny claims; supplemental disclosures made to avoid litigation delay.
Proxy amended with selected transaction announcement dates and financial analysis ranges.

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