The reaffirmation of the 'Sector Perform' rating and the maintenance of the $15 price target by RBC Capital suggests a neutral outlook on Rivian Automotive's stock in the short term. This analysis is based on the assumption that the market has already priced in the expectations set by RBC Capital's rating and target. Therefore, the immediate impact on RIVN's stock price is likely to be minimal, as the analyst's view does not represent a significant change in market sentiment or expectations.