The downgrade from Overweight to Equal-Weight by a major financial institution like Morgan Stanley suggests a less optimistic outlook on Teradata's stock performance. Additionally, the significant reduction in the price target from $74 to $48 indicates a revised expectation of the company's future valuation, likely due to changes in the company's financial outlook or market conditions. This could lead to a negative short-term impact on Teradata's stock price as investors adjust their expectations based on this new analysis.