AI Infrastructure Boom Powers Stocks Higher as S&P 500 and Dow Reach New Records

The stock market delivered another mostly positive session, with the S&P 500 gaining 0.1% and the Dow Jones Industrial Average advancing 0.5% to fresh record highs. The Nasdaq Composite finished essentially unchanged, though its marginal gain was enough to secure another record closing high.

Tuesday’s trading reflected a broadening of the AI-driven rally, as investors rotated into semiconductor, optical networking, power infrastructure, and industrial names tied to the ongoing buildout of artificial intelligence capacity. The broader market also showed improved participation compared to Monday’s narrowly led advance, although weakness among several mega-cap stocks limited gains at the index level.

A major market-moving headline came from Alphabet, which announced an $80 billion equity capital raise to accelerate the expansion of its AI infrastructure footprint. Shares fell 3.8% as investors weighed the impact of dilution and the scale of the company’s planned spending. The decline weighed heavily on the communication services sector, which finished as the worst-performing group in the S&P 500.

However, the market largely interpreted Alphabet’s announcement as a bullish signal for companies supplying the infrastructure needed to support the next phase of AI growth.

Optical networking stocks surged in response. Coherent and Lumentum were among the top-performing S&P 500 components, while Corning also posted a double-digit gain as investors positioned for increased demand across data center and connectivity markets.

The enthusiasm extended into semiconductors. Although NVIDIA finished modestly lower, comments from CEO Jensen Huang at Computex in Taipei electrified investors. Huang described Marvell Technology as the “next trillion-dollar company,” sending shares soaring to record highs and fueling broader strength throughout the semiconductor complex.

The Philadelphia Semiconductor Index jumped 5.9%, making it one of the strongest-performing areas of the market. The rally helped offset weakness in software stocks, which pulled back after a strong run and pushed the iShares Expanded Tech-Software Sector ETF down 2.8%.

The information technology sector still finished firmly higher, rising 0.9% on the day. Hewlett Packard Enterprise was another standout after delivering a strong earnings report and raising guidance, sending shares sharply higher.

Beyond technology, several cyclical sectors posted impressive gains. Utilities rebounded 1.9% as investors focused on the growing electricity demands of AI infrastructure. Alphabet’s comments about the need for additional computing capacity reinforced expectations for long-term growth in power generation and grid investment.

Materials stocks gained 1.2%, supported by strength in steel producers after the White House announced adjustments to certain metal tariffs. Industrials also moved higher following a reduction in tariffs on agricultural equipment imports. Deere and Caterpillar both posted strong advances as investors welcomed the more favorable trade environment.

The energy sector added 1.0% as oil prices steadily climbed throughout the session. Geopolitical developments remained relatively quiet, although ongoing Israeli military activity in Lebanon continued to attract investor attention.

On the downside, the communication services sector fell 2.6%, while health care lost 1.0%. Consumer discretionary stocks also lagged, declining 0.7%.

Smaller companies outperformed the major benchmarks, with both the Russell 2000 and S&P MidCap 400 gaining 0.9%, reflecting improving participation beneath the surface.

Overall, the session highlighted investors’ unwavering conviction in the AI infrastructure investment cycle. Capital continued flowing into semiconductor manufacturers, optical networking providers, data center suppliers, utilities, and industrial companies positioned to benefit from rising AI demand. That expanding leadership helped offset weakness in select mega-cap names and pushed the broader market further into record territory.

Our FTinvest 11 model portfolio rebounded strongly, gaining 1.49% to close at 1,039.74. The recovery follows yesterday’s sharp decline and allowed the portfolio to regain a substantial portion of the losses triggered by the significant drop in a single portfolio component. With today’s advance, FTInvest 11 has moved back to within 3.6% of its all-time high of 1,078.93.

FTinvest 11 is now up approximately +12.02% year-to-date, reaffirming its strong performance in 2026 despite the recent volatility. The swift rebound demonstrates the portfolio’s resilience and highlights the benefits of diversification, as strength across other holdings helped offset the impact of the recent company-specific setback.