Under the agreement, Prosperity to buy Stellar Bancorp through a mix of stock and cash, deepening its footprint in some of the state’s most competitive markets. By Wednesday afternoon, Prosperity shares were down more than 8%, trading at $66.49 per share, reflecting investor recalibration as the scale of the deal sank in. Advisors and Legal CounselProsperity is being advised by Wachtell, Lipton, Rosen & Katz, while Norton Rose Fulbright is serving as legal counsel to Stellar. Wachtell Lipton’s deal team is led by partners Edward D. Herlihy and Matthew T. Carpenter. Deal team details for Norton Rose Fulbright were not immediately available.