BRIEF-Court says Plato's proxy statement was materially misleading

May 19 (Reuters) - Plato Learning Inc:

* Court requires additional proxy statement disclosures before approving merger

of Plato Learning Inc and thoma bravo, llc

* Says court enjoined the proposed merger until corrective disclosures were

made

* Says court of Chancery held that Plato's proxy statement was materially

misleading on three counts

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