The Underweight rating suggests that JP Morgan's analyst believes that Church & Dwight Co's stock may not perform as well as its industry peers in the near term. However, the increase in the price target from $87 to $95 indicates a slightly more optimistic view of the company's potential, albeit still underperforming the market. This could lead to a mixed reaction in the short term as investors digest both the reaffirmation of the Underweight rating and the increased price target.