Aehr Test Systems has surged over 200% in 2026, becoming one of only five Russell 3000 stocks to achieve this return. The semiconductor testing equipment company announced a major customer win in silicon photonics on March 31, driving a 23% single-day gain. Despite missing Q3 revenue estimates, the company posted record bookings of $37.2 million and a record backlog of $50.9 million, signaling strong future growth in the AI infrastructure market. Craig Hallum upgraded the stock to Buy with a $68 price target.

Hedge funds are selling stocks at the fastest rate in 13 years, including Nvidia, despite the chipmaker delivering record-breaking financial results and a $500 billion backlog for AI chips. The article argues that long-term investors should ignore short-term market sentiment and hold their positions, as Nvidia's fundamentals remain strong with attractive valuations and significant strategic investments across the AI ecosystem.

JPMorgan Chase CEO Jamie Dimon projects that the top five hyperscalers (Microsoft, Amazon, Alphabet, Meta, and Apple) will increase their AI capital spending from $450 billion in 2025 to $725 billion in 2026. This spending surge will benefit AI infrastructure companies like chipmakers and data center REITs, but pose challenges for older cloud software companies like Salesforce and ServiceNow that may struggle against newer AI competitors.

As AI stocks experience a market correction, investors should focus on companies providing essential 'picks and shovels' infrastructure rather than smaller software companies. Hardware and equipment providers like Nvidia, Broadcom, and Lumentum remain strong long-term investments, while smaller AI software companies like C3.ai and BigBear.ai face marginalization as larger tech giants and generative AI platforms commoditize the market.

U.S. large-cap stocks posted strong gains during the shortened week of March 30-April 2. VinFast Auto led with a 42.77% jump driven by strong EV momentum and Canadian rebates. Alcoa gained 24.12% on bullish commodities sentiment amid Middle East conflict resolution expectations. Other notable gainers included SBA Communications (23.22%), Equinox Gold (20.98%), and several precious metals miners, with gains ranging from 15-19%.

Q1 2026 marked a dramatic market shift with oil surging 84% while Bitcoin plummeted 23%, signaling a rotation away from mega-cap growth toward real assets and energy. AI infrastructure plays like SanDisk and Lumentum soared on strong demand, while richly valued software and speculative growth stocks faced significant de-rating. The quarter demonstrated that traditional hedges and narratives are no longer reliable, with cash flow and tangible assets becoming increasingly important.

Iran's President declared readiness to end hostilities, triggering a market rally. WTI crude oil fell 2% to $100/barrel, while the Nasdaq 100 surged 3.2%. Airlines, clean energy, and growth stocks led gains, with the top 10 mega-cap tech and semiconductor companies generating nearly $950 billion in market cap gains.

The S&P 500 completed its quarterly rebalancing with four new additions and four removals effective March 23, 2026. Three AI-related stocks—Lumentum, Coherent, and Vertiv—joined the index alongside EchoStar. These companies have shown strong recent performance driven by data center buildout trends, including optical networking and cooling solutions. NVIDIA's $2 billion investments in Lumentum and Coherent underscore the importance of these technologies for future data center infrastructure.

NVIDIA's $2 billion investments in photonics companies Coherent and Lumentum signal a strategic shift toward photonics technology to address AI infrastructure bandwidth limitations. Both companies have seen significant stock rallies, with Coherent up 45% YTD and Nova Ltd., another photonics-adjacent firm, also up 45% YTD. While valuations have stretched considerably, strong fundamentals and long-term partnerships position these companies as critical players in AI infrastructure development.

Lumentum and Western Digital have outperformed Micron Technology in 2026, with gains of 90% and 77% respectively. Lumentum benefits from strong demand for optical and photonic products used in AI data centers, with revenue up 62% and earnings up 367% year-over-year. Western Digital is capitalizing on surging HDD demand for AI storage, with revenue up 26% and earnings doubled, while being sold out of HDD capacity through 2026 and securing long-term agreements with major customers.

Tower Semiconductor surged 31.5% this week driven by AI infrastructure enthusiasm and silicon photonics growth. The company announced a partnership with Oriole Networks for AI networking solutions and unveiled new BCD power management technology. Industry momentum was bolstered by Lumentum's impressive long-term revenue forecast at the Optical Fiber Communications Conference, signaling explosive growth potential for silicon photonics in AI data centers.

Markets sold off sharply on March 19, 2026, as Iranian strikes on Gulf energy infrastructure pushed crude oil above $100/barrel, triggering stagflation concerns. The S&P 500 hit its lowest close since mid-November, while the Federal Reserve's hawkish stance and rising inflation projections pushed Treasury yields higher. Gold plummeted 4.5% as real yields climbed, while energy stocks surged and precious metals miners collapsed.