Check out the companies making the biggest moves midday: Acadia Healthcare — The healthcare stock jumped about 7% after investors Khrom Capital filed to push the company to explore strategic alternatives. Acadia shares are down 33% year to date. Sarepta Therapeutics — The biotech company rallied 6%. While a catalyst for the move was not immediately clear, it did put Sarepta shares up more than 20% over the past three months. Starbucks — The global coffee chain saw shares rising 2.6% after the company announced a small increase in dividend payouts. Starbucks approved an increase in the company's quarterly cash dividend from 61 cents to 62 cents per share of outstanding common stock. Occidental Petroleum , Berkshire Hathaway — Occidental fell 6% even after Berkshire Hathaway announced it was

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