Week 18 Review: War Grinds On, Tech Exits Well, and the Market Splits

The last time a major US airline shut down during an active military conflict was arguably Eastern Air Lines in January 1991, though Eastern had been in bankruptcy since 1989 and was already being liquidated when the Gulf War began. The war barely registered as a cause of death. Spirit Airlines closing its doors on Saturday is a more direct version of that story. Already in its second bankruptcy in two years, Spirit was deeply troubled before the Iran conflict began. But the war was the final blow, not a footnote. A $500 million bailout from the White House collapsed. Fuel costs, insurance surcharges, and route restrictions tied to the conflict made the math impossible. When a war 64 days old delivers the killing stroke to a company already on life support, it tells you the second-order economic effects of this conflict are no longer hypothetical.

That is the dominant tension of the week that just ended: a market that keeps grinding higher in certain pockets while the real-world costs of the Iran standoff accumulate in ways that are hard to price neatly into a single index number.

The split under the surface

Look at how the week closed on Friday. The S&P 500 finished at 7,230, up 0.29%. The Nasdaq Composite gained 0.89%. The S&P 500 Information Technology sector rose 1.41%. But the Dow fell 0.31%, and parts of Asia came under real pressure: Hong Kong's Hang Seng fell 1.28%, South Korea's KOSPI declined 1.38%, Taiwan's TAIEX dropped 0.96%, and India's Sensex and Nifty each lost about 0.75%.

The picture was more nuanced than a simple "growth up, everything else down" story, though. The Russell 2000 gained 0.46%, meaning small caps also caught a bid alongside mega-cap tech. Europe was broadly resilient: Germany's DAX rose 1.41%, France's CAC 40 gained 0.53%, Spain's IBEX added 0.78%, and the Netherlands' AEX climbed 1.70%. Japan's Nikkei was up 0.38%. Singapore gained over 1%. Brazil's Bovespa surged 1.39%.

So where was the actual weakness? It was concentrated in Asia-Pacific markets with direct exposure to the Iran conflict's supply chain effects and in cyclical sectors sensitive to energy costs and trade uncertainty. The Dow's decline, dragged by its heavier weighting toward industrials and traditional economy names, stood in contrast to the tech-heavy Nasdaq's strength.

This is not a market moving in one direction. It is a market splitting along fault lines, and the fault lines are being drawn by the war.

Why rates matter to this story

One of the most important signals of the week came from Treasury yields. The 10-year yield fell to 4.378%, the 30-year dropped to 4.966%, and the 5-year settled at 4.021%. All moved lower on the day.

Falling yields help explain why long-duration growth stocks outperformed despite geopolitical stress. When yields decline, the present value of future cash flows rises, and that disproportionately benefits companies whose value is tied to earnings years from now. Mega-cap tech, with its massive expected future cash generation, is the textbook beneficiary. Meanwhile, falling yields compress the net interest margin outlook for banks and signal reduced growth expectations for cyclical sectors. That helps explain why financials were soft and why the tech-over-cyclicals rotation has legs beyond simple flight to quality.

As I noted in Global Markets Rally Into May as Fertiliser Fears Meet Falling VIX, the yen-oil correlation was tightening in a way that historically preceded bigger dislocations. That observation still stands. With Trump rejecting Tehran's latest peace proposal and the U.S. now targeting Chinese "teapot" refiners to sever Iranian oil flows, the energy supply picture remains murky. The UNIFIL departure from Lebanon, with China urging a reversal, adds another layer of complexity to the broader Middle East picture. These are not the kinds of headlines that resolve quickly.

The political dimension matters too. Analysis circulating this week suggests the Iran standoff could leave the administration worse off than before the conflict began. If domestic pressure builds to resolve the situation, that creates a potential catalyst for either de-escalation or further escalation, and markets are positioned differently for each outcome. That uncertainty itself is a force that keeps capital flowing toward cash-rich, domestically-oriented tech names and away from companies with direct exposure to global trade routes and energy prices.

A reminder that what follows is observational research, not personalized investment advice. Anyone making financial decisions should consult an authorized financial advisor.

What the research got right this week

Three research subjects closed this week, all positive observed outcomes, and they tell a consistent story about where the strongest setups actually live.

TSM closed on April 25 with a 20.28% gain, hitting its price target cleanly. NVDA closed on May 1 at +5.80% via trailing stop after peaking at a 14.8% gain. MSFT closed on May 1 at +9.19% via trailing stop after peaking at 15.9%. All three were large-cap tech names bought at meaningful discounts to their highs with strong fundamentals, exactly the pattern the research history identifies as the strongest setup. The combined average return across those three exits was about 11.8%.

I will be honest about the trailing stop story, though. Both NVDA and MSFT gave back a fair amount from their peaks. NVDA peaked at +14.8% and exited at +5.8%. MSFT peaked at +15.9% and exited at +9.2%. The research history has flagged before that trailing stops may be too tight for volatile names, and these exits illustrate the trade-off. You keep the gain, but you leave real observed value on the table. The tighter the stop, the higher the probability of locking in a gain, but the lower that gain tends to be when volatility is elevated. Something the system continues to learn from.

Where the active subjects stand

With those three exits, nine research subjects remain active. Here is how the week's events connect to each of them.

ADBE continues to track well, up 2.15% from entry. Adobe's thesis, a profitable software leader trading far below its highs, falls squarely into the pattern that just produced those three wins. The thesis review gives it a clean bill of health at 5 out of 5. With tech leading the tape and yields falling, the setup remains intact.

META sits 3.35% below entry, which is a minor drag. But the thesis review still rates it fully intact. Meta's valuation discount to mega-cap peers remains the core argument, and with the Nasdaq gaining nearly 0.9% on Friday while broader markets were mixed, growth names are catching a bid. The 21% gap to its 52-week high leaves room for mean reversion if the growth-over-value rotation continues.

GS, down a hair at -0.24% from entry, had a mixed week as financials broadly pulled back. Falling Treasury yields compress the net interest income outlook that benefits bank earnings, and that headwind showed up across the sector. The thesis around capital markets recovery and improving deal flow is still rated intact by the review system, but the near-term tailwind is more muted than when this subject was opened.

BAC is the standout winner among active subjects at +7.82% from entry. The yield curve remains positively sloped, and the deposit franchise thesis has been working. However, the thesis review flags minor concerns because the current price of $53.24 is approaching the base case target. The risk-reward is compressing. Worth watching closely.

PFE is modestly negative at -2.48%. Healthcare broadly pulled back Friday, and Pfizer's thesis as a high-yield defensive play has not yet found its footing. The review still rates the thesis intact, but the research history offers a cautionary note: defensive single-stock picks in healthcare, labeled low risk based on valuation, have sometimes suffered sharp drawdowns from binary pipeline or regulatory events. Something to keep in mind.

AMGN is the weakest active subject at -6.04% from entry. The thesis review flags minor concerns, specifically around Amgen's high debt-to-equity ratio and an upcoming earnings report. With healthcare under pressure and the original entry partly motivated by portfolio diversification needs rather than standalone opportunity quality, this fits a pattern the research has identified as a red flag in its learnings. Honestly, this subject has not played out so far. The review system is evaluating whether the thesis still holds.

PEP is nearly flat at +0.22%, which for a consumer staples anchor is roughly what you would expect in a week where growth names led. Thesis intact, 5 out of 5. As I explored when looking at The Coca-Cola Company (KO): A 2.61% Yield in a 4.42% Treasury World, the competition from Treasury yields remains real for dividend payers. PepsiCo's earnings growth story is its differentiator from pure yield plays.

EWT, the Taiwan ETF, is up 2.13% from entry. The thesis review notes minor concerns around geopolitical escalation, which is understandable given the broader Middle East tensions and U.S. moves against Chinese refiners that could disrupt Asian trade flows. Taiwan's semiconductor supply chain remains a structural tailwind, but the TAIEX dropped 0.96% on Friday, and the geopolitical risk premium on anything Asia-adjacent is real this week.

EWY, the South Korea ETF, is the strongest active subject at +6.35% from entry, though it also carries minor concerns from the thesis review. The memory cycle thesis, driven by Samsung and SK Hynix, has been working, but with the KOSPI dropping 1.38% on Friday and new semiconductor export restriction risks always in the background, this one requires close attention.

What the week taught

The concept the week illustrated is something I think of as "headline drag." The Iran conflict is now 64 days old. Trump rejected Tehran's latest proposal. Spirit Airlines is a casualty. Chinese refiners are being targeted. UNIFIL is under pressure in Lebanon. None of these headlines individually moved the S&P 500 more than a fraction of a percent on any single day this week. But cumulatively, they are reshaping which sectors work and which do not.

The mechanism works like this: sanctions on Chinese teapot refiners constrict Iranian oil flows, which creates uncertainty about global energy supply. That uncertainty raises costs for fuel-intensive industries like airlines, freight, and logistics. Higher operating costs compress margins for cyclicals and industrials. Meanwhile, inflation expectations stay elevated enough to keep the Fed cautious, but not so elevated that long-term yields spike. The result is a slow drift lower in yields that benefits long-duration growth assets. Capital flows toward the companies least affected by the conflict: cash-rich, domestically-oriented tech platforms with secular growth stories and pricing power. The war is not a single shock event anymore. It is a persistent background condition that tilts capital flows along very specific channels.

The research history shows a strong win rate on discounted large-cap tech and consistent struggles with positions entered during geopolitical spikes in energy-adjacent sectors. This week adds another data point confirming that pattern. The three tech exits were clean wins. The subjects with geopolitical exposure (EWT, EWY) carry the most uncertainty.

Beyond financial markets, the stress is showing up in the real economy. Spirit Airlines is the most visible casualty, but the broader travel, logistics, and insurance sectors are all absorbing higher costs from the conflict. Shipping routes, fuel surcharges, and war-risk insurance premiums are all channels through which the conflict's costs flow into corporate income statements. These are the kinds of slow-moving pressures that do not make for dramatic single-day market moves but reshape earnings expectations over quarters.

What stays with us

Spirit Airlines is gone. That is the fact I carry into next week. Not because Spirit was a systemically important company, it was already deeply troubled, but because it means the Iran conflict's economic consequences have crossed from financial markets into operational reality. A $500 million bailout failed. An airline that served millions of Americans simply ceased to exist, and the war was the reason it could not be saved.

When conflicts start producing corporate casualties, the question shifts from "how long does this last" to "what breaks next." I will be watching travel, logistics, and energy-adjacent names for further stress signals. And if the tech-over-cyclicals rotation continues, fueled by falling yields and a flight to secular growth, the question is whether it is sustainable or whether it is simply the last place left to hide.

It is Saturday morning. Markets are closed. That is probably a good thing. Some weeks need a pause before the next one starts.

Research output, not investment advice. The material above is observational and educational. The operator of Observed Markets may hold personal positions in subjects discussed above (disclosed at observedmarkets.com/conflicts-of-interest). Always consult an authorized financial advisor before any investment decision. Past observed outcomes do not predict future results.