Feb 23–Feb 27, 2026: S&P 500 & US Market Weekly Review

S&P 500 -0.32% | NASDAQ -0.76% | DOW -1.13% | Russell 2000 -0.85% | VIX 19.86 | 2026-02-23 – 2026-02-27

---

Weekly Market Overview

US equities closed February on a sour note, with all four major indices finishing the holiday-shortened week in the red. The S&P 500 slipped -0.32% to 6,878.88 — capping a February that saw the index lose nearly 1% and fall back below its 50-day moving average for the seventh time this month, with the 6,900 level morphing from support into stubborn resistance. The Dow Jones suffered the sharpest blow at -1.13% to close at 48,977.92, while the NASDAQ Composite gave back -0.76% to 22,668.21 and the Russell 2000 retreated -0.85% to 2,632.36. Tellingly, the VIX ended the week at 19.86 — elevated but marginally calmer than its 20.49 open, as markets managed controlled anxiety rather than outright panic.

The week's narrative unfolded in three distinct phases. The first two days saw sharp selling, with the S&P 500 plunging to an intraday low of 6,815.43 on Tuesday before bouncing. Monday, Feb 23 opened at 6,901 and shed -63 points to close at 6,837.75 as geopolitical unease around Iran and tech valuation concerns dragged risk assets lower. Tuesday, Feb 24 offered a tentative recovery — the index clawed back from an early dip to 6,815 to close at 6,890 — even as President Trump delivered his 2026 State of the Union that evening, accusing Iran of "reviving efforts to build nuclear weapons" in a speech that ran nearly two hours.

The midweek surge was the week's brightest moment. Wednesday, Feb 25 opened at 6,915 and reached the week's intraday high of 6,952.51 before closing at 6,946 — up nearly +110 points from Monday's trough. Optimism around ongoing US-Iran nuclear talks in Oman and a robust earnings beat from Dell Technologies (revenue +40% YoY to $33.4B) fueled the rally. The mood reversed sharply on Thursday, Feb 26, when Jack Dorsey's fintech firm Block (XYZ) announced it was laying off nearly 4,000 employees — nearly half its workforce — attributing the cuts explicitly to AI replacing human labor. While Block shares surged 24%, the announcement ignited broad anxiety about AI-driven displacement across the economy. The index opened at 6,945 but reversed to close at 6,909, still above its 50-day MA. Friday, Feb 27 delivered the week's coup de grâce: a hotter-than-expected PPI print (+0.5% MoM, driven by services), US-Iran nuclear talks concluding with "no deal," and ominous weekend geopolitical signals pushed the S&P 500 down to close at 6,878.88. As markets closed, two US carrier strike groups were repositioning in the Eastern Mediterranean — a fact not lost on oil traders.

---

Sector Performance

The rotation away from growth and into defensive safe havens was the defining feature of the week. The sector breakdown tells a clear story: inflation hedges, defensive income, and hard assets led, while financials and technology lagged.

Top Outperformers

Utilities and Consumer Staples surging simultaneously is a textbook defensive rotation — investors moved into dividend-paying, inflation-resistant sectors as they de-risked. Energy's +1.60% reflects early geopolitical risk pricing: with US-Iran nuclear talks failing and a US carrier group sailing toward Israel, crude oil began anticipating a supply disruption premium. Exelon (EXC, PE 17.5×) and Keurig Dr Pepper (KDP, PE 26.8×) from the screened portfolio both align with this defensive posture — EXC as a regulated utility and KDP as a consumer staples play.

Bottom Underperformers

Technology's underperformance reflects two compounding forces: Block's AI layoff shock re-ignited concerns that AI disruption may impair tech sector employment and ultimately earnings multiples, while Microsoft (-9% in February) and Oracle (-13% in February) remain in correction territory. Financials sold off amid renewed concerns about private credit market stress (following the UK mortgage firm collapse) and the higher-for-longer rate environment suggested by the hot PPI.

---

Stocks in Focus

Diamondback Energy (FANG) — the quant screener's top pick every single day this week with scores ranging from 0.62 to 0.75 — looks particularly prescient in hindsight. At PE 12.2× and PB 1.27×, FANG offers dirt-cheap exposure to Permian Basin oil production at a moment when Iran conflict risk is becoming existential. Energy stocks with US-domestic production profiles are precisely the kind of asset that outperforms when Middle East supply is threatened.

Block, Inc. (XYZ) was the week's most talked-about story. CEO Jack Dorsey's decision to cut 40% of headcount (~4,000 jobs), framing it as an AI transformation and predicting "the majority of companies will reach the same conclusion within a year," sent the stock +24% on the announcement. But the broader market read the subtext differently: if a fintech can cut half its workforce and get rewarded, every sector is potentially exposed to similar AI-driven labor displacement. The ripple effect weighed on financial sector stocks and raised valuation questions for high-multiple growth names.

Dell Technologies (DELL) reported FY2026 full-year revenue of $113.5B — a record — with Q4 revenue of $33.38B beating estimates by $1.75B (+40% YoY). AI infrastructure demand is driving a supercycle in server sales. This was the week's cleanest positive catalyst.

Salesforce (CRM) reported Q4 2025 adjusted EPS of $3.81, crushing the $3.03 consensus, with revenue of $11.2B. Shares jumped ~4%, providing some ballast to beleaguered software names.

PDD Holdings (PDD) continued to appear on the screener at PE 10.5× and 10.7× — exceptional value for a China e-commerce leader. The risk, as always, is tariff escalation and geopolitical friction with Beijing.

PayPal (PYPL, PE 8.7×) screened Thursday at a compelling valuation, though fintech broadly faced headwinds from the Block layoff news and private credit jitters.

---

Key News & Events

1. Trump State of the Union — Iran Nuclear Ultimatum (Feb 24): In his 1-hour-47-minute address — the longest in US history — Trump accused Iran of "reviving efforts to build nuclear weapons" and developing advanced missiles capable of threatening Europe and US bases. The speech set the diplomatic table for what would unfold over the weekend. (CNBC)

2. Block / AI Displacement Shock (Feb 26): Jack Dorsey's Block laid off ~4,000 employees (nearly half its staff), explicitly citing AI tools. Dorsey warned most companies would follow within a year. Block shares +24% on the news, but the announcement amplified AI anxiety across the broader market. (CNN Business)

3. Hot PPI Print (Feb 27): January Producer Price Index rose +0.5% month-on-month on services inflation — well above consensus — reinforcing the "higher for longer" Fed narrative and dashing hopes for a March rate cut (CME FedWatch had priced ~37% odds of a March cut). The Fed held rates at 3.50–3.75% in January; markets now see fewer cuts in 2026. (FinancialContent)

4. US-Iran Nuclear Talks Collapse (Feb 26–27): The "most intense" round of US-Iran nuclear negotiations wrapped in Oman with no deal. The US carrier strike group USS Gerald R. Ford departed Crete for Israeli waters on Feb 26. Markets ended the week with a geopolitical cliff-hanger heading into the weekend. (CNBC)

5. Dell's AI Server Supercycle / Salesforce Beat: Two earnings bright spots in an otherwise turbulent week. Dell's record FY2026 revenue ($113.5B) and Salesforce's 26% EPS beat confirmed that enterprise AI spending remains robust even as broader tech stocks lag. (Nasdaq)

---

⚔️ Iran War: Market Impact Analysis

What Happened

During the week of Feb 23–27, the Iran conflict escalated from diplomatic brinkmanship to the edge of open war — with the actual kinetic strike arriving on Saturday, Feb 28, hours after US equity markets closed.

The sequence: On Feb 13, Trump publicly mused that regime change in Iran would be "the best thing that could happen." By the State of the Union on Feb 24, Trump formally accused Iran before Congress of nuclear weapons development and issued an implicit ultimatum. The Feb 26 departure of the USS Gerald R. Ford carrier group toward the Israeli coast made clear that military options were being actively positioned. By Feb 27, US-Iran nuclear talks wrapped in Oman with "no deal" and Trump told reporters he was "not happy" with progress.

Then on February 28 (Saturday), the United States and Israel launched a massive coordinated strike on Iran — Operation Epic Fury (US) and Operation Roaring Lion (Israel). Approximately 200 Israeli Air Force jets struck ~500 Iranian targets simultaneously. Iran's Supreme Leader Ayatollah Ali Khamenei was killed. Iran retaliated with drones and missiles against Israel and US military installations across Bahrain, Kuwait, Qatar, Jordan, the UAE, and Iraq. The week ending Feb 27 was, in retrospect, the last week of "anticipation" — the war the market feared was pricing in had not yet begun. It was priced in on Monday morning, March 2.

---

⚰️ Khamenei's Death: Succession Crisis & Market Implications

What happened: On February 28, Iranian state media confirmed that Supreme Leader Ayatollah Ali Khamenei — who had ruled Iran since 1989 — was killed at his office during the US-Israeli strikes. He was 86. Iran announced a 40-day official mourning period. Trump publicly referred to him as "evil" and stated strikes would continue "as long as necessary" to secure peace.

Global Public Reaction

Inside Iran — A Fractured Nation The reaction within Iran was strikingly divided. In parts of Tehran, celebratory gatherings erupted among Iranians who had long opposed the clerical regime; decades of economic hardship, social repression, and protest crackdowns had built a deep reservoir of anti-Khamenei sentiment. Simultaneously, pro-regime crowds gathered at Revolution Square and in front of Tehran University in state-organized mourning. The split reflects a country that has lived under profound political tension since at least the 2009 Green Movement — and that tension is now an open variable.

United States Americans took to the streets in sharply divided fashion: celebrations in some cities, protests against the military action in others. The political divide mirrors polling on the strikes themselves — roughly aligned with partisan lines, with hawks celebrating "regime decapitation" and critics warning of blowback.

International Community

• China: Called for an "immediate cessation of military action," resumption of dialogue, and condemned the strikes as a threat to regional stability — framing itself as the responsible global power counterweight to US-Israeli unilateralism.
• Russia: Condemned the strikes; called for UN Security Council emergency session.
• Arab States: Mixed. Gulf monarchies (Saudi Arabia, UAE) privately relieved at IRGC weakening but publicly called for restraint. Qatar and Oman — both key Iran intermediaries — scrambled to re-open diplomatic channels.
• EU: Called for de-escalation; several member states summoned US ambassadors.
• Iran's government: Called the strikes a war crime, stated "hundreds of civilians were killed," and invoked international law violations.

The Succession Problem

Iran's constitution (Article 111) provides a clear legal mechanism: upon the Supreme Leader's death, authority passes immediately to an interim council comprising the president, the head of the judiciary, and a senior cleric chosen by the Expediency Council — until a new Supreme Leader is elected by the Assembly of Experts.

Leading succession candidates:

The Council on Foreign Relations issued a key warning: "Taking out Khamenei is not the same as regime change. The Islamic Revolutionary Guard Corps is the regime." The IRGC controls Iran's military, missile program, vast economic assets, and the critical levers of state power. A clerical succession crisis may actually strengthen IRGC influence in the short term — which is bearish for rapid de-escalation.

Three Scenarios and Their Market Reads

Scenario 1 — Regime Fracture / Reform Opening (probability: ~20%) IRGC loses internal cohesion; reformist factions leverage the power vacuum to push for a negotiated settlement. This is the most bullish outcome — potentially analogous to the Soviet Union's collapse, which unlocked a decade-long equity bull market in emerging markets. Oil normalizes, sanctions path opens, US equities rally sharply (S&P +5–8% in 1–2 weeks).

Scenario 2 — Controlled Succession, Ceasefire Negotiated (probability: ~50%) Interim council stabilizes, IRGC brokers a ceasefire with face-saving terms. Qatar or Oman mediates. This is the base case — most similar to the Gulf War endgame. Oil retreats $10–15 from spike highs, airlines and travel names recover sharply, defense stocks give back 30–40% of conflict gains.

Scenario 3 — IRGC Doubles Down, Prolonged Conflict (probability: ~30%) With Khamenei gone, IRGC hardliners assert control and escalate to demonstrate strength — potentially operationalizing the Strait of Hormuz. This is the tail risk scenario: Brent above $100, S&P -5 to -10%, 1973 stagflation playbook replaces 1991 liberation playbook. Defense stocks surge further; consumer and growth names hit hard.

Historical analog check: Saddam Hussein's capture (2003) didn't end Iraq's insurgency; Gaddafi's death (2011) led to prolonged Libyan chaos. But Iran has a more institutionalized political structure than either — making Scenario 2 the most historically grounded base case.

---

Historical War Market Playbook

History is instructive. Markets tend to fear the uncertainty of war more than the war itself — and recoveries often begin from the moment conflict commences.

Pattern analysis:

• The clearest lesson from history is: uncertainty is worse than the war itself. The Gulf War caused the most sustained pre-war selloff (-18%), but once Desert Storm launched and oil crashed 33%, the S&P surged 17.6% in four weeks.
• Modern markets recover faster. The Russia-Ukraine and Israel-Hamas episodes showed same-day or next-day reversals, reflecting deep institutional liquidity and the localized nature of those conflicts.
• The Iran situation is more analogous to the Gulf War — a direct US military engagement in the Persian Gulf region with significant oil supply risk — than to the other three comparisons.

---

Sector Implications for Current Conflict

Energy / Oil (+) Iran controls ~3.5 million barrels per day of production and critically borders the Strait of Hormuz, through which over 14 million barrels per day (roughly one-third of global seaborne crude) flow. Analysts at the time of writing estimated oil could spike $10–$20/barrel in the near term; scenarios involving Hormuz closure could push Brent above $100. Energy stocks (XLE +1.6% this week — already pricing in risk) and E&P names like Diamondback Energy (FANG) — screened as the week's top pick every single day — stand to benefit significantly.

Defense & Aerospace (+) Defense contractors benefit from any major military engagement. Historical precedent: following October 7, 2023, US defense manufacturers returned +54% over the subsequent year. Lockheed Martin, RTX, Northrop Grumman, and L3Harris are the primary beneficiaries of an Iran campaign given the air defense and precision munitions-intensive nature of the operation.

Safe Havens: Gold & Bonds (+) Flight to safety intensifies with Iranian retaliation targeting US bases across six countries. Gold and US Treasuries (flight-to-quality yield compression) historically absorb the initial shock capital. Treasury yields falling 5–10 basis points was the expectation for the March 2 open.

Airlines & Travel (–) Iranian drone and missile strikes targeting US military bases in the Gulf directly disrupt commercial aviation corridors. Airlines with heavy Middle East route exposure face immediate headwinds. Energy cost spikes from higher oil compound this.

Financials (–) Already down -1.46% this week, financials face additional headwinds: elevated uncertainty suppresses deal flow, and any banking exposure to Gulf-region sovereign debt or infrastructure financing faces repricing.

Consumer Discretionary (–) A sustained oil price shock acts as a consumption tax. Higher gasoline prices compress discretionary spending margins. This sector's +0.19% this week was already the weakest non-tech, non-financial reading.

---

Ceasefire / De-escalation Scenario

If diplomatic channels reassert themselves — as they eventually did after every prior conflict — historical markets offer a clear playbook. In the Gulf War, peace drove a sharper rally than the war itself: the S&P returned nearly 30% in calendar year 1991. In the Iraq War, markets rallied +3.8% from invasion through the fall of Baghdad on April 9. The pattern is consistent: once the worst-case tail risk (prolonged conflict, Hormuz closure) is removed, markets re-rate sharply higher.

There are already early signals: Trump told CBS News on Feb 28 that a diplomatic solution is now "easily possible — much easier now than it was a day ago, obviously, because they are getting beat up badly." If ceasefire talks materialize — potentially mediated by Qatar or Oman (the channel that brokered the original nuclear talks) — the rally in the following sectors and specific S&P 500 names would likely be swift and sharp.

Airlines & Travel — Highest Beta to Ceasefire

• Delta Air Lines (DAL) — The most institutionally held US airline, suspended Middle East routes. Oil-cost reversal plus Hormuz reopening is a double tailwind. Stock likely gap-up 8–12% on credible ceasefire.
• United Airlines (UAL) — Significant trans-Pacific and Gulf route exposure; similar upside profile to DAL.
• Booking Holdings (BKNG) — Online travel aggregator; benefits from both oil cost relief and the removal of Middle East travel advisories that suppress global booking intent. PE ~18×, typically reverts sharply on geopolitical de-escalation.
• Royal Caribbean (RCL) — Cruise lines face dual headwind of fuel costs and route disruption; ceasefire removes both. Historically one of the fastest-recovering consumer stocks in post-conflict rallies.

Consumer Discretionary — Fuel Cost Relief

• Amazon (AMZN) — Logistics cost compression from lower fuel prices, plus risk-on multiple expansion.
• Norwegian Cruise Line (NCLH) — Higher leverage than RCL; greater upside/downside sensitivity.
• Expedia Group (EXPE) — Direct beneficiary of travel demand normalization.

Technology & Growth — Rate Cut Narrative Returns

• Nvidia (NVDA) — Already volatile from Khamenei news; a ceasefire removes the geopolitical discount and restores focus on AI fundamentals. If oil-driven inflation cools, the Fed rate-cut path re-opens, compressing growth discount rates.
• Microsoft (MSFT) — Defensive AI revenue + rate-cut multiple expansion. Off ~9% in February, deeply oversold relative to fundamentals.
• Alphabet (GOOGL) — Ad-market recovery tends to lag 1–2 weeks behind equity market relief rallies; patient entry.

Financials — Deal Flow & Risk Appetite Resume

• JPMorgan Chase (JPM) — Investment banking pipelines frozen during conflict; ceasefire unlocks M&A activity and capital markets issuance.
• Visa (V) / Mastercard (MA) — Cross-border transaction volumes recover with Middle East travel normalization.

Sectors to REDUCE on Ceasefire (Conflict Unwinds)

---

Investment Positioning

Based on the historical playbook applied to the current Iran situation:

1. Energy overweight near-term. History is unanimous: oil and gas equities outperform in active Middle East conflicts. FANG's consistent appearance as the week's top-scored quant pick (PE 12×, PB 1.27×) offers both value protection and geopolitical beta.

2. Defense sector tactically attractive. RTX, LMT, NOC have multi-year revenue visibility from increased US and allied defense spending. The Israel-Hamas precedent (+54% in one year) is a useful baseline.

3. Reduce airline, cruise, and travel exposure short-term. Oil spikes and Gulf airspace disruption are near-term headwinds.

4. Hold defensive sectors (Utilities, Staples, Health Care). This week's sector rotation — XLU +2.71%, XLP +2.66% — is historically consistent with late-cycle/conflict positioning. These sectors typically hold value until the market sees a credible deescalation path.

5. Watch the Strait of Hormuz as the key macro variable. If Iran operationalizes the Strait as a weapon, Brent above $100 triggers a different regime — one where the inflation-rate dynamic overwhelms the equity bounce. That scenario looks like 1973 stagflation more than 1991 liberation.

6. Be ready to reverse quickly. Geopolitical discounts evaporate fast. The Gulf War playbook: once the operation's success became clear, late buyers missed most of the 17% four-week rally.

---

Watch List for Next Week (Mar 2–6, 2026)

Key risk: weekend gap. Markets will open Monday, March 2 having been closed while a war with Iran began. Position accordingly.

---

Sources:

• Stock Market Live Feb 27 — 24/7 Wall St.
• S&P 500 Falls as Risk-Off Prevails — Bloomberg
• S&P 500 Snapshot: 50-Day MA Pivot — Advisor Perspectives
• PPI Inflation Data Rocks Markets — FinancialContent
• Rover's Weekly Market Brief 02/27/2026 — Stock Rover
• US-Iran Nuclear Talks Collapse — CNBC
• US-Iran Nuclear Tension / SOTU — CNBC
• 2026 Iran–United States Crisis — Wikipedia
• 2026 Israeli–United States Strikes on Iran — Wikipedia
• Iran Strikes Oil Market Impact — Bloomberg
• Oil Price Jump $10–$20 — Yahoo Finance
• Markets Brace for Iran Strikes — CNBC
• Block Layoffs AI — CNN Business
• Block Shares Soar 24% — CNBC
• Fed Holds Rates Steady January 2026 — CNBC
• Fed Minutes — Widening Divide on Rate Cuts — Axios
• Gulf War Stock Market — Dunham
• Iraq War S&P 500 Performance — Hartford Funds
• Russia-Ukraine S&P 500 Feb 24 2022 — CNBC
• Israel-Hamas War US Markets — CNBC