The initiation of coverage by Leerink Partners with a Market Perform rating suggests a neutral outlook on ALGN's stock in the short term. The price target of $310 indicates the analyst's expectation of the stock's potential to reach this value, but the 'Market Perform' rating does not suggest a strong bullish or bearish stance. Therefore, the impact on the stock price is likely to be neutral in the short term, as investors may wait for further developments or additional analyst coverage to make significant moves.