• The S&P 500 fell 0.4% on Tuesday, May 20, as investor confidence in trade and inflation seemed to shake a six-day streak.

• FICO shares fell after a federal housing official expressed concerns about the pricing of credit scorers.

• Moderna's stock has increased higher, according to new FDA guidelines on COVID-19-19 vaccine boosters.

Major U.S. stock indexes have fallen as concerns over the sustainability of recent market rally. The rally was based on increased probation on tariffs and optimism about improving trade relations.

The S&P 500 fell 0.4%, ending six straight positive deals. Nasdaq stocks were still below 0.4%, while the Dow Jones fell 0.3%.

Credit Score Provider Expo Stock ISAAC (FICO) fell 8.1%, posting its weakest daily performance in the S&P 500. This move is relatively low. The move lowered comments from FHFA director Bill Pulte, who expressed concerns about the price of FICO and expressed support for more cost-effective credit assessment options.

AES Corp.AESStocks fell 4.1% after Jefferies downgraded the generator stock to "underperforming." Analysts cited the stock's high valuation, uncertainty surrounding utility credit ratings, and a less favorable look to the prospect of the renewable energy business starting in 2027.

Truist analysts lowered their target targets for Norwegian Cruise Company Stocks (NLH). The company noted that a decline in consumer confidence would affect demand for cruising, although revenue and other metrics may require a quarter or two to reflect the impact of a given extended booking period. Cruise operators' shares fell 3.9% on Tuesday.

Modern (mRNA) Stocks soared 6.1%, getting the most of all S&P 500 indexes after the Food and Drug Administration (FDA) released new guidelines related to Covid-19-19-19 vaccine promoters. The agency will require additional clinical data on vaccines for healthy individuals under 65 years of age, but will continue to approve immunization for those older or higher risk. As older people and high-risk groups make up a large part of annual vaccination, the updated framework will not help change the status quo of modern major markets.

Discount retailer dollar stocks (dltr) and US dollars (DG) was 4.6% and 4.1%, respectively. Earnings follow comments from Walmart CEO last week (WMT), he noted that high prices will lead to higher prices in company stores. Analysts say two competitors known for cheap products may be in a good position to attract value-seeking consumers, as price tags start to reflect the impact of tariffs.