US stock indices closed higher on May 9 (US Eastern Time), with the Dow Jones Industrial Average rising 139.02 points (0.27%) to 52,487.41, the S&P 500 gaining 60.93 points (0.81%) to 7,543.64, and the Nasdaq Composite climbing 336.24 points (1.30%) to 26,206.89. Bargain buying lifted markets amid expectations that US-Iran military exchanges would remain short-term, while Micron Technology's announcement of a large-scale semiconductor facility investment plan supported AI-themed stocks. The US and Iran continued military confrontations for a third day around the Strait of Hormuz, with the US conducting airstrikes on Iranian sites including a commercial nuclear power plant facility and railway bridge, while Iran responded by launching missiles at US bases in neighboring countries.
US Stock Indices Post Gains on May 9
On May 9 (US Eastern Time), the New York Stock Exchange saw the Dow Jones Industrial Average close 139.02 points (0.27%) higher at 52,487.41. The S&P 500 index rose 60.93 points (0.81%) to 7,543.64, and the Nasdaq Composite jumped 336.24 points (1.30%) to finish at 26,206.89. Market participants showed limited concern over ongoing US-Iran military exchanges, as President Donald Trump stated the airstrikes would be brief and mentioned that Iran called him expressing a desire for negotiations.
Micron Announces $250B Investment Plan Through 2035
Micron Technology announced it will expand its US fab and technology investment to more than $250 billion by 2035 to meet surging memory demand in the AI era. The investment plan is projected to create over 90,000 jobs in the United States. Micron's stock rose 4.52% during the session after climbing more than 9% intraday. The announcement came one day before SK Hynix's American Depositary Receipt listing and reinforced AI optimism across semiconductor stocks.
Market Reaction to Geopolitical Developments
Iranian media reported that US forces struck military bases in southern Iran on May 9, with multiple explosions heard in major southern coastal cities. Despite continued military exchanges between the two nations, market participants remained largely unfazed as intermittent clashes repeated during ongoing ceasefire negotiations. Megan Horneman, Chief Investment Officer at Verdence, stated that the "on-and-off" nature of the conflict cannot help but affect investors to some degree, and that the market environment will remain unstable going forward.
Sector Performance Data
The Philadelphia Semiconductor Index gained 3.06% on May 9. AMD rose 5.67%, while ARM Holdings climbed 9.20%. Technology, consumer discretionary, and financial sectors each advanced more than 1%. Energy and consumer staples sectors declined more than 1%. Meta Platforms gained 4.7% after CEO Mark Zuckerberg introduced the "Muse Spark 1.1" AI model in a media interview, describing it as one of the most affordable options in the market. Broadcom, Tesla, and SpaceX each rose approximately 3%. The CBOE Volatility Index (VIX) fell 1.06 points (6.27%) to 15.84. According to the CME FedWatch Tool, federal funds futures markets reflected a 17.7% probability that the benchmark interest rate would remain unchanged through the end of December, a slight increase from the prior day.
FAQ
What did US stock indices do on May 9?
On May 9 (US Eastern Time), the Dow Jones Industrial Average rose 139.02 points (0.27%) to 52,487.41, the S&P 500 gained 60.93 points (0.81%) to 7,543.64, and the Nasdaq Composite climbed 336.24 points (1.30%) to 26,206.89, driven by bargain buying and Micron Technology's investment announcement.
What investment plan did Micron announce?
Micron Technology announced it will expand its US fab and technology investment to more than $250 billion by 2035 to meet AI-era memory demand, with the plan projected to create over 90,000 jobs in the United States. Micron's stock rose 4.52% on May 9 following the announcement.
