Wall Street closes higher, buoyed by U.S. debt buyback plan and Moderna trial data

Wall Street concluded Wednesday's trading session in positive territory, with investors buoyed by a significant announcement from the U.S. Treasury and encouraging clinical trial results from biotechnology firm Moderna. The Dow Jones Industrial Average saw a modest increase of 0.22%, closing at 53,463 points. The S&P 500 index advanced by 0.21% to 7,707 units, while the tech-heavy Nasdaq Composite gained 0.16%, ending the day at 26,331 points.

The U.S. Treasury Department revealed its intention to double debt buybacks to at least $4 billion. This move helped reduce the yields on long-term bonds, put downward pressure on the dollar, and consequently stimulated risk appetite in the stock market. Bond yields had recently spiked due to inflation fears, stemming from uncertainty in the Middle East and rising energy costs, with the 30-year Treasury yield reaching a 19-year high. By the session's close, the 30-year yield had fallen to 5.18%, and the 10-year yield stood at 4.63%.

Healthcare companies led the gains across sectors, with an impressive rise of 3.52%. A major driver of the day's performance was Moderna, whose stock price skyrocketed by 176%. This surge followed the release of promising data from a late-stage clinical trial for a melanoma vaccine, developed in partnership with pharmaceutical company MSD, which also saw its stock climb by 12.6%. Investors also closely monitored the minutes from the Federal Reserve's latest monetary policy meeting, where interest rates were held steady. Several Federal Open Market Committee (FOMC) members indicated a willingness to raise rates if inflation, currently above 3%, does not decline soon.

In other markets, West Texas Intermediate crude oil rose by 1.05% to $85.83 per barrel, following the United Arab Emirates' announcement of suspended trade relations with Iran, signaling a new escalation of tension in the Middle East. Gold prices increased to $4,579 per ounce. The euro traded at $1.1677 against the dollar, and Bitcoin saw a rise to $68,715.