S&P 500 Closes Lower as Oil Climbs, Powell Says Inflation Anchored, Trump Threatens to Obliterate Kharg Island, Micron Tumbles 10%, Aluminum Spikes

Wall Street opened the week in positive territory on Monday but couldn’t hold on. The S&P 500 slid 0.39% to close at 6,343.72, posting its third consecutive losing session and remaining just over 9% off its closing high. The Nasdaq Composite fell 0.73% to 20,794.64, weighed down by a brutal selloff in memory chips and persistent weakness across the technology sector. The Dow Jones Industrial Average managed a modest gain, rising 49.50 points, or 0.11%, to close at 45,216.14 — an early-session rally of more than 400 points fading almost entirely by the bell.

The session’s narrative was dominated by two forces pulling in opposite directions. Federal Reserve Chair Jerome Powell, speaking at Harvard University, delivered the most dovish signal since the war began — telling students and the broader market that inflation expectations remain “well anchored” and that there is no need to raise interest rates in response to the oil shock. That sent rate hike odds plummeting. But the relief was undercut by President Trump’s escalatory threat to “blow up and completely obliterate” Iran’s oil wells, power plants, and Kharg Island if a peace deal is not reached shortly — pushing oil to fresh highs and reminding investors that the fundamental risk has not changed.

Closing Scoreboard

What Happened

Powell Delivers Dovish Lifeline at Harvard

The most consequential market event of the day was Fed Chair Jerome Powell’s appearance at Harvard University, where he gave his clearest indication yet that the central bank will not raise rates in response to the oil shock. “Inflation expectations do appear to be well anchored beyond the short term,” Powell told the audience. He emphasized that the current fed funds rate target of 3.50–3.75% is “a good place” for the Fed to remain while it observes how events unfold.

Critically, Powell explained the economic logic for staying put: “By the time the effects of a tightening in monetary policy take effect, the oil price shock is probably long gone, and you’re weighing on the economy at a time when it’s not appropriate. So the tendency is to look through any kind of a supply shock.”

On private credit, Powell acknowledged rising defaults and investor withdrawals from the $3 trillion sector but characterized the situation as a correction rather than a systemic threat. “We’re looking for connections to the banking system and things that might result in contagion. We don’t see those right now,” he said. Separately, Fed Governor Stephen Miran echoed that assessment, telling CNBC that private credit developments “don’t present economic risk thus far.”

Trump’s Kharg Island Ultimatum

Any relief from Powell’s dovish messaging was offset by President Trump’s escalatory rhetoric. In a Truth Social post, Trump declared that the U.S. is “in serious discussions with A NEW, AND MORE REASONABLE, REGIME to end our Military Operations in Iran” and that “great progress has been made.” However, he added a jarring caveat: if a deal is not reached “shortly” and the Strait of Hormuz is not “immediately” reopened, the U.S. will “blow up and completely obliterate all of their Electric Generating Plants, Oil Wells and Kharg Island (and possibly all desalinization plants!).”

Kharg Island handles roughly 90% of Iran’s crude oil exports. Destroying it would permanently remove approximately 1.5 million barrels per day of global supply and represent a dramatic escalation of the conflict. The threat pushed WTI crude up 3.25% to $102.88 — its highest close since July 2022. Brent crude settled at $112.78, with the international benchmark now up more than 55% in March alone — on pace for the biggest monthly surge in its history since the contract’s inception in 1988.

Trump also told the Financial Times on Sunday that his “preference would be to take the oil” in Iran, drawing comparisons to the U.S. military operation in Venezuela earlier this year.

Aluminum Spikes After Iran Strikes Gulf Producers

A new front in the economic fallout from the war emerged Monday when aluminum prices surged after Iranian missile strikes over the weekend disrupted major production facilities in the Middle East. Three-month aluminum on the London Metal Exchange jumped 3.85% to $3,420 per metric ton, trading near four-year highs and briefly touching $3,492. The strikes targeted facilities linked to Alba in Bahrain and Emirates Global Aluminium in the UAE, both among the world’s largest aluminum smelters.

Micron’s Collapse Deepens

Micron Technology fell another 10% on Monday, extending a punishing slide that has now erased more than 30% of the stock’s value in just eight trading sessions. The company is barely in positive territory for the year after being up more than 60% as of mid-March. The selloff, which began after a blowout earnings report, intensified following Google’s announcement of its TurboQuant memory compression breakthrough — a technology that traders fear could reduce demand for traditional memory chips.

The broader semiconductor space was under pressure as well. The VanEck Semiconductor ETF (SMH) fell 2.8%, putting its monthly decline at 10.6% — on pace for its worst month since December 2022. Advanced Micro Devices and Broadcom each fell roughly 3%.

Mega-Cap Movers

The Magnificent Seven were mixed on Monday, with Meta, Microsoft, and Amazon posting gains while Nvidia, Tesla, Apple, and Alphabet declined. Meta’s 2% bounce was the most notable move — the stock is attempting to stabilize after last week’s combined $375 million child-safety penalty and $4.2 million addiction damages verdict stripped more than $70 billion from its market capitalization. Nvidia continued to slide toward official bear market territory, now down more than 21% from its October intraday high.

Sector Breakdown

The day’s sector rotation told a clear story: Powell’s dovish hold helped rate-sensitive sectors while technology bore the brunt of the semiconductor selloff. Financials led the advance, rising 1.13% as the prospect of steady rates (rather than hikes) provided relief to bank earnings models. Utilities and consumer staples also gained as investors sought defensive positioning.

Technology was the worst-performing sector for the third time in four sessions, dragged down by Micron’s 10% plunge and broad semiconductor weakness. Energy was the surprise laggard in an up-oil day — XLE fell nearly 1% despite WTI surging 3.25%. The decline likely reflects profit-taking after the sector’s massive run this month, and investors locking in gains ahead of quarter-end rebalancing tomorrow.

Economic Data and Global Markets

Consumer Sentiment Deteriorates

The University of Michigan’s final March consumer sentiment reading came in at 53.3, a three-month low and down from 57.0 in the preliminary reading. Year-ahead inflation expectations surged to 3.8%, up from 3.4% in February. The war-driven gasoline price spike — the average has risen $1.00 to $3.98 per gallon — is taking a direct toll on how Americans feel about the economy. The OECD last week raised its U.S. inflation forecast for 2026 from 2.8% to 4.2%.

Global Markets Sold Off

Asia took the harder hit as the war entered its fifth week. South Korea’s Kospi plunged 2.97%, and Japan’s Nikkei 225 fell 2.79% after Bank of Japan minutes suggested policymakers may need to accelerate rate hikes as oil-driven inflation pressures build. Hong Kong’s Hang Seng lost more than 1%. European markets closed higher despite souring economic sentiment, with the Stoxx 600 eking out a modest gain as investors rotated into defense and energy names.

401(k) Alternative Asset Rules

The Trump administration’s Labor Department proposed new rules that would make it easier for 401(k) plans to include private credit, private equity, crypto, and real estate investments — opening access to the $14 trillion market for firms like Blackstone and Apollo. The timing is notable given the ongoing stress in private credit, but the rules include a “safe harbor” provision for employers who follow prescribed due-diligence processes.

Corporate News

• Sysco / Jetro Restaurant Depot: Sysco agreed to acquire Jetro Restaurant Depot for a total enterprise value of $29.1 billion. Sysco shares fell 2% on the news despite the company calling the deal “immediately accretive.” The transaction is expected to close in Sysco’s 2027 fiscal third quarter.
• CrowdStrike upgraded: Wolfe Research upgraded the cybersecurity company to outperform, arguing that AI-driven cyber threats will increase demand rather than displace the company’s products. Morgan Stanley also named it a top pick. Shares rose more than 2.5%.
• Nike earnings preview: Nike reports tomorrow with shares hovering near an eight-year low. Investors are watching for signs that new CEO Elliott Hill’s wholesale-first strategy is gaining traction, with competition from New Balance, On, and Adidas intensifying. Wholesale revenue grew 8% last quarter while direct sales fell 8%.
• Strategy halts Bitcoin purchases: Michael Saylor’s Strategy (formerly MicroStrategy) made no new Bitcoin purchases last week, snapping a 13-week buying streak. Bitcoin ETFs posted $296 million in net weekly outflows.
• OpenAI advertising: OpenAI’s ChatGPT ad network hit $100 million in annualized revenue in just two months. The company shuttered its Sora video app (estimated to cost $15 million per day) as it refocuses on enterprise and coding tools.
• Artemis II launch Wednesday: NASA’s Artemis II mission is set to launch Wednesday, sending four astronauts on a 10-day journey around the moon — the first crewed lunar mission since Apollo 17 in 1972.
• NATO tensions escalate: Germany’s AfD called for the total removal of 40,000 U.S. troops and American nuclear weapons from German soil, escalating tensions within the alliance. Spain has also restricted U.S. base usage for Iran operations.

The AlphaEdge Take

Monday was a tale of two speeches. Powell calmed the rate market. Trump inflamed the oil market. In the tug-of-war between the two, oil won again — but only barely, and the damage was contained to specific pockets rather than spreading across the entire market.

Powell’s remarks at Harvard were the most significant development of the day, and perhaps of the week. By explicitly stating that the Fed will “look through” the oil shock — the textbook central bank response to a supply-side disruption — he effectively took rate hikes off the table. The collapse in hike probability from 50% on Friday to 2.2% on Monday is a dramatic repricing that removes one of the market’s most acute anxieties. Stable rates mean the economy has a better chance of absorbing the energy shock without tipping into recession, and it means growth stock valuations are not facing the double threat of higher discount rates layered on top of weaker earnings.

But Powell also acknowledged that the Fed might “eventually face the question” of what to do about inflation if energy prices persist at these levels. That qualifier matters. The Fed can look through a temporary oil spike. It cannot look through a permanent shift in the energy cost structure that starts bleeding into wages, housing, and services inflation. If the war drags into May and June with Hormuz still restricted, the “supply shock” framework will be tested.

The aluminum story is worth watching closely. Iran’s strikes on Gulf aluminum production represent a new vector of economic damage from the conflict. If Tehran escalates by targeting more critical industrial infrastructure in neighboring countries, the economic fallout widens beyond oil and gas into metals, petrochemicals, and manufacturing inputs. That is the kind of supply-chain contagion that makes stagflation more likely — higher costs across multiple input categories simultaneously.

The week ahead is shortened by Good Friday but packed with data. Nike reports tomorrow after the bell. ISM Manufacturing data lands Tuesday. The March jobs report drops Friday morning while markets are closed, meaning investors will have the entire weekend to digest what could be the first post-war employment data — a pivotal reading for the recession debate. With the VIX at 30 and Brent crude above $112, this is not a market that rewards bold bets in either direction. Stay nimble, stay hedged, and keep an eye on whether Trump’s “great progress” in peace talks translates into anything concrete before the Easter weekend.