Published: September 20, 2026 at 01:37 PM
Weekly Market Memory
Weekly Market Memory
1. Weekly Summary
On September 16, the FOMC raised its benchmark rate by 25bp for the first time in three years, to 3.75-4.00%, but a split among the 18 members — six favoring a hold and four favoring cuts — was read as "the hiking cycle nearing its peak," triggering a relief rally led by semiconductors and tech from the day after the announcement. The Nasdaq was the only major index to hold a weekly gain, up +0.72% to 26,522.54, while the VIX fell from a mid-week high of 18.94 to 14.81 (-6.50%), confirming that an outright risk-off episode never materialized. Confirmed earnings from Broadcom (revenue +85.5%) and Micron (+345.7%) underpinned the AI infrastructure demand narrative, and the spillover reached Asia, lifting Taiwan's TAIEX +2.16% and the Nikkei +1.57%.
Rate pressure never fully eased. The 10-year yield touched 5.02% mid-week and closed at 5.00%, and while short-term yields rose (^IRX +1.79%) the 30-year fell (^TYX -0.37%), flattening the curve and dashing hopes for wider net interest margins at financials. As a result, Financials -2.43%, Utilities -3.04%, and REITs -2.05% — the three rate-sensitive sectors — filled out the bottom of the heatmap, while the Dow -1.69% and Russell 2000 -1.50% widened the internal divergence among indices. A stronger dollar (DXY +1.11%) combined with a weaker won (USD/KRW 1,385.00, +2.73%) meant Korea ETFs fell as much as -3.93% even as the KOSPI itself only slipped -0.23%, and as the geopolitical premium unwound, defense ETFs posted the week's steepest drop at -6.99%.
The September 24 Trump-Xi summit in Washington will determine whether the semiconductor rally continues. A deal to cut roughly $30 billion in reciprocal tariffs would give the semiconductor ETF's thin stop-loss buffer (5.29% as of the weekend) time to widen further, but a breakdown would revive suspended tariffs on China, directly hitting the very sector that carried the index this week. Right after that, Micron's earnings on September 30 (consensus revenue +348% YoY) and the presidential decision deadline on Section 232 copper import tariffs fall within two days of each other, so next week looks more like an event-driven holding pattern than a directional resolution.
2. Last Week's Outlook Check
3. Portfolio Drift & Risk
Weekly Portfolio Drift
The week's defining asset-allocation quirk was long bonds rising even as rates rose. The 10-year yield climbed +0.60% to 5.00%, but the 30-year fell -0.37% to 5.33%, and since long-bond ETF prices track the 30-year maturity segment, TLT ended +0.47% higher. Equities diverged internally — the large-cap index (SPY -0.09%) was essentially flat while the Nasdaq 100 (QQQ +0.92%) alone rose — and gold defended +0.60%, withstanding both rising rates and a stronger dollar at once. Energy moved the other way: as the Saudi east-west pipeline came back online, the supply-risk premium unwound and WTI pulled back from a mid-week high of $106.75 to $100.30, leaving the sector ETF as the only asset class among the four to post a meaningful loss, -1.27%. Stocks, bonds, and gold defending together while only energy falls looks less like risk-off and more like a normalization of the geopolitical premium.
Risk Analysis
Weekly Detail by Asset Class
| Asset Class | Representative Ticker | Weekly Return | Notes |
|---|---|---|---|
| Equities | SPY | -0.09% | Mid-week low of 747.74 to close at 761.69, fully recovering the drawdown in the final two sessions |
| Fixed Income | TLT | +0.47% | 30-year decline (-0.37%) pushed prices higher despite the 10-year rise |
| Gold | GLD | +0.60% | Withstood dollar strength of +1.11% to set a weekly high of 403.15 |
| Energy | XLE | -1.27% | Pipeline restoration pulled WTI back from a high of $106.75 to a close of $100.30 |
Risk Indicator Interpretation
| Indicator | Value | Meaning/Context |
|---|---|---|
| VIX (Fear Index) | 14.81 (weekly -6.50%, high 18.94 / low 14.80) | Lower end of the normal 12-18 range. Spiked to 18.94 right before the FOMC, then closed the weekend near the weekly low |
| 10Y Treasury Yield | 5.00% (weekly +0.60%, high 5.02% / low 4.93%) | Held near its highest level since 2007 all week. The direct cause of rate-sensitive sectors sweeping the bottom of the rankings |
| Weekly Max Drawdown | -1.95% (S&P 500 mid-week high 7,657.17 to low 7,507.77) | A shallow drawdown for a week that layered two macro shocks on top of each other |
| 1-Week Cumulative S&P 500 | -0.08% (7,656.98 to 7,650.50) | Three straight days of losses were fully recovered in the final two sessions |
| Regime | neutral | Risk-off early in the week (VIX 18.94, semiconductors -4.75%) shifted to risk-on late in the week (VIX 14.81, three-day semiconductor rally) |
4. Sector Performance
5. Week at a Glance
| Date | Market Summary | S&P 500 | NASDAQ | VIX | WTI | Regime |
|---|---|---|---|---|---|---|
| 09-14 (Mon) | A triple threat as an AI-slowdown essay sank semiconductors while oil and rates pressed at once | 7,619.98 | 26,186.41 | 17.10 | $101.39 | risk_off |
| 09-15 (Tue) | Strait of Hormuz blockade pushed oil toward its weekly high as FOMC caution built | 7,585.73 | 25,981.57 | 17.20 | $105.83 | risk_off |
| 09-16 (Wed) | FOMC day: the 10-year hit its weekly high of 5.02% as the index posted its weekly low of 7,507.77; money rotated into cybersecurity names | 7,551.81 | 25,978.43 | 17.71 | $102.43 | risk_off |
| 09-17 (Thu) | 25bp hike (3.75-4.00%, 12-0) read as a peak signal sparked a Nasdaq +1.69% relief rally as the VIX fell -12.8% | 7,637.76 | 26,418.30 | 15.44 | $101.91 | risk_on |
| 09-18 (Fri) | Semiconductors' third rally day and triple witching produced a mixed index close as the VIX hit its weekly low | 7,650.50 | 26,522.54 | 14.81 | $100.30 | risk_on |
| 09-19 (Sat) | Market closed — figures reflect the prior session's (09-18) close | 7,650.50 | 26,522.54 | 14.81 | $100.30 | — |
| 09-20 (Sun) | Market closed — figures reflect the prior session's (09-18) close | 7,650.50 | 26,522.54 | 14.81 | $100.30 | — |
6. Trading Signal Changes
Start-of-Week vs. End-of-Week Signal Comparison
| ETF | Asset Class | Start-of-Week Entry | End-of-Week Entry | Change | End-of-Week Trail Buffer |
|---|---|---|---|---|---|
| SPY | Core | Met | Met | → | 27.97% |
| QQQ | Core | Met | Met | → | 26.47% |
| XLK | Core | Met | Met | → | 25.52% |
| SMH | Thematic | Met | Met | → (broke, then returned mid-week) | 5.29% |
| BOTZ | Thematic | Not met | Not met | → | 4.22% |
| EWY | Thematic | Not met | Not met | → | 2.08% |
| XLV | Thematic | Not met | Not met | → | 15.35% |
| XLE | Thematic | Not met | Not met | → | 17.19% |
| AIPO | Thematic | Not met | Met | ↑ | 1.95% |
| ROKT | Thematic | Not met | Not met | → | -3.12% |
| GLD | Safe Haven | Not met | Not met | → | -3.49% |
| TLT | Safe Haven | Not met | Not met | → | 6.82% |
| CPER | Commodity | Met | Met | → | 12.43% |
| DBB | Commodity | Met | Met | → | 12.12% |
Rebalancing Actions
Accumulate
Held its entry condition all week and widened its stop-loss buffer from 7.66% to 12.43%. Spot copper reconfirmed a record high per ton mid-week, and the September 30 Section 232 import-tariff decision remains an upside catalyst.
Accumulate
Riding the same driver as copper. Stop-loss buffer recovered from 8.82% to 12.12%, making the two commodity names the healthiest pair in this week's strategy group.
Hold
Entry condition intact with a comfortable 25.52% stop-loss buffer. But since the +2.26% pop the day after the FOMC accounted for the entire weekly gain, this looks more event-driven than trend-driven.
Hold
Both stayed in condition with stop-loss buffers of 26-28%. At the index level, this week's macro shocks left almost no trace.
Watch
Mid-week breakout followed by a Friday return leaves the state still unstable. The 5.29% stop-loss buffer falls short of the 8% safe zone, and with two confirmed catalysts ahead — the September 24 US-China summit and the September 30 Micron earnings — this is a spot to confirm the recovery holds next week rather than a spot to add size.
Exit
The entry condition broke on Monday, sending the stop-loss buffer from 5.44% to -0.22%, and the weekend's 2.08% recovery is still shallow. The KOSPI itself only fell -0.23%, but a 2.73% weaker won cut further into the dollar-denominated return. A return to the 1,400-won level would widen the loss again.
Watch
Regained the condition on Friday, but the stop-loss buffer is a razor-thin 1.95% and price remains below the long-term trendline. That is close enough to an instant stop-out that meeting the condition alone is not an entry signal.
Watch
Failed to meet its entry condition all week, with a thin 4.22% stop-loss buffer. That robotics/AI posted a loss in a week when semiconductors rallied highlights selective strength within the theme.
Trim
Entry condition unmet, and the supply premium has now unwound too. The 17.19% stop-loss buffer is ample, but there is little case for holding size through a pullback.
Hold
Both remain outside their entry conditions but posted gains in a rate-rising week. Gold's stop-loss buffer, in particular, is still negative at -3.49%, so it is not a new-entry candidate — hold only for existing hedge purposes.
Watch
The week's top performer, but the entry condition was never met. This looks like a temporary inflow of defensive demand rather than a genuine trend return.
Exit
The stop-loss buffer stayed negative (-3.12%) all week. Continue to avoid.
Weekly Signal Events
- Newly met entry condition: AIPO (09-18), SMH (09-18, re-entry after breaking)
- Broke entry condition: EWY (09-14), SMH (09-15), AMZN (09-15)
- Entered trail-risk zone (stop-loss buffer under 5%): EWY (09-14, 5.44% to -0.22%), MU (09-14, 7.72% to 3.64%)
- Cleared trail risk: MU (09-17, 7.90%), SMH (09-18, 5.29%)
- Already under 5% at the start of the week: AIPO, BOTZ, GLD, ROKT, AVGO, SPCX
Weekly Discussion Review
| Date | Symbol | Verdict | Headline | Subsequent Weekly Move | Review |
|---|---|---|---|---|---|
| 09-14 | CPER | REDUCE (0.5x) | Structural deficit from confirmed Grasberg supply loss remains valid, but both sides jointly cited the hawkish Fed regime shift as a cap on buying | +5.15% | Direction was right. But the rate risk both sides cited never actually hurt copper, so only half the upside was captured |
| 09-14 | MU | SKIP (0.0x) | Trail buffer of 3.64% below threshold plus an imminent FOMC | +9.93% | Missed. A rules-based avoidance that fell just 0.36pp short of the 4% stop-loss buffer threshold cost the entire weekly rebound |
| 09-14 | SMH | SKIP (0.0x) | Trail buffer of 0.6% below threshold, layered with the FOMC re-hike narrative | +5.82% | Missed. But at a 0.6% stop-loss buffer — a distance that would trigger an instant stop-out — the same condition would produce the same verdict every time |
| 09-17 | MU | REDUCE (0.5x) | HBM contract revenue structure remains valid, but both sides jointly warned of rate-driven risk-off from the imminent BOJ hike | +3.92% | Hit. Caught the moment the stop-loss buffer recovered to 7.90% and rode the rally at half size |
| 09-17 | SMH | REDUCE (0.5x) | AI capex narrative remains valid, but both sides cited rate-hike and oil-spike risk-off risk as a cap on BUY | +2.21% | Hit. Taking half size at a spot that cleared the threshold by just 0.09pp ended up being the right call |
| 09-18 | SMH | REDUCE (0.5x) | Semiconductor earnings cycle and dovish FOMC read remain valid, but SOXX overheating and a 4.06% trail buffer are near threshold | 0.00% | No verdict possible — the discussion fell on the last trading day of the week, so there is no subsequent move |
| 09-19 | AIPO | SKIP (0.0x) | Trail buffer of 1.95% and tech integrity score of 5.0 both below threshold | — | No verdict possible — a weekend discussion with no subsequent trading day |
| 09-19 | SMH | REDUCE (0.5x) | Supply-shortage-driven demand narrative for semiconductors remains valid, but the trail buffer is thin ahead of two confirmed catalysts | — | No verdict possible — a weekend discussion with no subsequent trading day |
Strategy-Level Weekly Recap
The number of names meeting entry conditions barely moved, from six at the start of the week to seven at the end, but the underlying health diverged. The three core names (SPY, QQQ, XLK) and two commodities (CPER, DBB) sit in a stable 12-28% stop-loss buffer range, while the two names that newly met conditions (SMH at 5.29%, AIPO at 1.95%) are both pressed against their stop lines, so meeting the condition alone did not translate into an entry signal. In substance, this week's strategy takeaway is that "in a week when rates rose, only two rate-independent drivers survived — copper and AI earnings" — and next week both of those drivers hinge on single events: the September 30 copper tariff decision and the September 24 US-China summit, respectively.
7. Weekly Sentiment Flow
| Date | Reddit Read | Key Topics |
|---|---|---|
| 09-14 (Mon) | Mixed | Crowding into index ETFs amid the semiconductor plunge; MU stayed among the top-mentioned names even during the correction |
| 09-15 (Tue) | Bullish | Simultaneous crowding into index ETFs and a surge of interest in AI infrastructure and new-space small caps; crypto interest receded |
| 09-16 (Wed) | Neutral | Hike-vs-hold debate the day before the FOMC, disappointment over the Clarity Act's defeat, wariness of oil-Treasury co-movement (correlation 0.96) |
| 09-17 (Thu) | Bearish | The Fed hike itself was as expected, but the dot plot's disappearing rate cuts combined with the oil shock stoked stagflation worries |
| 09-18 (Fri) | Bullish | A one-day relief rally and "it's already priced in" optimism; AI infrastructure themes surfaced simultaneously across multiple subreddits |
| 09-19 (Sat) | Mixed | Geopolitical and diesel-price concerns and valuation caution versus AI revenue optimism and bitcoin at $80,000; WSB showed active short-dated options interest |
| 09-20 (Sun) | Neutral | A re-rating argument to remove memory chips from the cyclical bucket versus caution over AI safety and regulation |
8. Daily Summaries
| Date | Day | One-Line Summary | Link |
|---|---|---|---|
| 09-14 | Mon | An AI-slowdown essay sent semiconductor ETFs down -4.75% as oil and rates pressed at once, with the KOSPI also plunging -3.26% | Daily Report |
| 09-15 | Tue | A Strait of Hormuz blockade pushed WTI up to $105.83 while the 10-year pressed toward 5%, heightening FOMC caution | Daily Report |
| 09-16 | Wed | FOMC day: the 10-year hit a weekly high of 5.02% and the S&P touched a weekly low of 7,507.77, with money moving into cybersecurity names | Daily Report |
| 09-17 | Thu | After the 25bp hike (3.75-4.00%, 12-0), the Nasdaq staged a +1.69% relief rally as the VIX fell -12.8% to 15.44 | Daily Report |
| 09-18 | Fri | A third day of semiconductor rally sent SMH +2.21%, while the KOSPI rose +2.66% as foreign investors turned net buyers for the first time in eight sessions | Daily Report |
| 09-19 | Sat | Market closed. A wrap-up of the week showing Broadcom and Micron earnings reconfirming the AI infrastructure cycle | Daily Report |
| 09-20 | Sun | Market closed. A summary of a week in which AI earnings offset two macro shocks — an oil scare and renewed tightening | Daily Report |
9. Next Week's Outlook
Scheduled Key Events
- 09-21 (Mon): Okta Analyst Day — a spotlight on the AI-agent identity-security theme
- 09-22~23 (Tue-Wed): UN General Assembly — a window where additional Iran-related provocations are being floated
- 09-22~25 (Tue-Fri): Earnings from KB Home, Cintas, Paychex, General Mills, Darden, Costco, and AutoZone — a read on housing, employment, and consumer resilience amid the rate-hike phase
- 09-24 (Thu): Trump-Xi summit in Washington — negotiations over roughly $30 billion in reciprocal tariff cuts
- 09-30 (Wed, following week): Micron earnings (consensus revenue +348% YoY), the presidential decision deadline on Section 232 copper import tariffs, and the federal budget deadline
Key Watch Points
- The US-China summit will decide whether the semiconductor rally extends into a fourth week: Semiconductors were effectively the only thing propping up the index this week (SMH +0.79% and XLK +1.03% being the only sizable large-cap gains), and that sector's stop-loss buffer at 5.29% falls short of the 8% safe zone. A tariff-cut deal would give it room to widen further; a breakdown would revive suspended tariffs squarely aimed at this sector.
- Whether the 10-year retests 5%: A weekly high of 5.02% and a close of 5.00% leave the yield perched right at the threshold. If it retests and holds, the losses in this week's three rate-sensitive sectors (XLU -3.04%, XLF -2.43%, XLRE -2.05%) would carry into next week. Conversely, if the long end keeps getting pressed like the 30-year (5.33%, -0.37%), long-bond ETF gains should hold.
- Whether copper strength holds through the tariff decision: The copper ETF (+2.68%) and an industrial-metals basket (+2.09%) were the healthiest names in the strategy group, with stop-loss buffers widening into the 12% range. The September 30 Section 232 decision is the final confirmation point for this trend, and position-trimming ahead of the decision is also a possibility.
Risk Factors
- Renewed Strait of Hormuz blockade or escalation: If Oman-mediated reopening talks collapse, forecasts diverge sharply between a scenario where WTI spikes to $140 and a base case where Brent falls to $85. This week, oil merely pulled back from a high of $106.75 to $100.30 while still holding above $100, so the underlying supply risk was never actually resolved. The transmission path runs from oil prices to reignited inflation to further Fed tightening to renewed declines in rate-sensitive sectors.
- Stagflation from further Fed tightening: The dot plot's year-end median of 4.1% (range 3.9-4.4%) implies further hikes are possible this year, while August CPI already ran hot at +3.4% YoY, well above target. If oil-driven supply inflation combines with tightening, slowing growth and rising prices could arrive together, leaving even this week's defensive winners — healthcare and staples — without a clear safe haven.
- Yen carry-trade unwind: Even as the BOJ hiked to 1.25% (roughly a 31-year high), USD/JPY actually moved toward yen weakness, to 156.85 (+1.53%). If this divergence reverses, a sharp position unwind like August 2024 would hit emerging markets and growth stocks first. The indicator to watch is the daily change in USD/JPY.
- Further damage to Korean assets from won weakness: As USD/KRW slipped back to 1,385.00 (+2.73%), a KOSPI move of -0.23% became -3.93% in dollar terms. If the won re-enters the 1,400s, dollar-based returns would stay negative even if the domestic market rebounds, and the risk grows that the foreign-investor net-buying turn on 09-18 proves to be a one-day event.
This Week's Q&A
- The Fed hiked rates for the first time in three years, yet bank stocks were the worst performer of the week. Shouldn't higher rates mean banks make more money?
- The KOSPI was basically flat this week, but my Korea ETF dropped almost 4%. Did the exchange rate eat it all?
- A risk signal fired and I sat out per the rules, but that's exactly the stock that ended up rallying the most that week. Is it still worth following these stop-loss rules?