Stock market today: Dow, S&P 500, Nasdaq sink as post-election rally fades, Fed prompts rate-cut rethink

The S&P 500's decline amidst uncertainty about the Fed's monetary policy direction indicates potential regression in stock prices as investors reassess their positions. This suggests further risk in the broader market, especially tech stocks like the Nasdaq.

Palantir shares soared over 8% following the news of its upcoming listing on Nasdaq, reflecting strong investor interest and confidence in its future performance. The prospect of joining the Nasdaq 100 index could further drive up its stock price as more institutional investments flow in.

Pfizer's stock fell roughly 4% due to concerns surrounding leadership changes in health policy, which could affect future vaccine initiatives. Given the uncertainty and weakening support for vaccine stocks, the trend may continue downward.

Moderna's shares are showing a similar downward trend as Pfizer, largely influenced by the political climate impacting vaccine stock valuations. The recent appointment of RFK Jr. as Secretary of Health adds another layer of risk for biotech stocks associated with vaccines.