Based on US stock returns through the Oct 9, 2026 close. Weekly breadth counts all US stocks; "liquid names" are stocks over $5 with market cap over $100M, average volume over 1M shares and an average daily range (ATR) over 2.4%. Inferences are labelled (inference).
Market backdrop
| ETF | 1M | 3M | 6M |
|---|---|---|---|
| SPY | +2.7% | +3.1% | +14.6% |
| QQQ | +6.0% | +3.6% | +22.9% |
| IWM | -3.0% | -5.8% | +6.8% |
| SMH | +7.7% | -1.3% | +38.1% |
| IGV | +11.3% | +21.9% | +50.9% |
| XLE | +0.2% | +18.2% | +14.3% |
This week, leadership moved from semis to software.
- Semiconductors liquid-name average 1W was -7.4% (it was +5.2% in the 10-06 snapshot).
- Software-Infrastructure liquid-name average 1W was +5.2%, and Software-Application +4.9%.
- IGV now leads SMH on 1M, 3M and 6M.
- Small caps still lag: IWM 1M -3.0%, 3M -5.8%.
Weak groups (liquid-name averages, 1M):
- Agricultural Inputs: -26.2%. Note that CTVA shows 1M -84.3% and 3M -84.6%, which drives this average. (inference) It looks like a corporate-action or data artifact, not price weakness. Unverified.
- REIT-Mortgage: -17.3% (3M -24.1%)
- Casinos: -14.8% (3M -24.7%)
- Telecom Services: -12.7%
- Other Precious Metals: -12.4%
- Agricultural Machinery: -11.0% (1W -10.2%)
- Gold: -8.8% (GDX 1M -7.0%)
- Oil & Gas Equipment & Services: -8.8%
- Sector ETFs: URA 1M -13.6%, TAN 1M -7.0% (3M -20.4%), ITA 1M -5.3% (3M -13.6%), XLU 1M -2.6%
Weekly themes
1. Software re-rating + cybersecurity (broadening)
Breadth:
- Software-Infrastructure: 19/145 (13.1%) up >=10% in 1W, and 15/145 (10.3%) up >=25% in 1M. Liquid-name average 1W +5.2%, 1M +10.3%.
- Software-Application: 23/233 (9.9%) up >=10% in 1W. Liquid-name average 1W +4.9%.
| Ticker | 1W | 1M | 3M |
|---|---|---|---|
| ZS | +18.9% | +43.0% | +67.8% |
| NTSK | +17.0% | +37.5% | +68.5% |
| ASAN | +16.8% | +17.6% | +37.4% |
| FSLY | +13.5% | +29.0% | +49.6% |
| TENB | +12.9% | +29.8% | +4.6% |
| SHOP | +12.9% | +35.0% | +39.4% |
| RPD | +12.7% | +30.9% | +23.0% |
| PLTR | +10.8% | +26.0% | +64.9% |
| GTLB | +10.7% | +16.5% | +69.9% |
| TEAM | +10.1% | +15.2% | +132.7% |
Why:
- Oct 6 (Reuters): US software stocks hit fresh 2026 highs as AI-disruption fears faded. The S&P 500 software and services index rose +1.3% to its highest level since Nov 2025, after its biggest quarterly gain since Q2 2020.
- The sector's expected 2026 earnings growth has risen to 20.6%, from 13.8% at the end of March (LSEG).
- Drivers named: Salesforce, ServiceNow and Accenture earnings, plus partnerships with AI labs.
- Context: the software index fell more than 26% from late January to April (the "SaaSpocalypse") (Kitco/Reuters).
- Deutsche Bank upgraded software to overweight, saying AI-disruption fears have peaked. Jefferies data showed long-only investors bought about twice as many software shares as they sold in the prior week (iTiger).
- Oct 8–9: An FT report put OpenAI's annualized revenue near $50B, below the roughly $70B figures that had circulated. Chips sold off, while software barely moved (IGV -0.23% on Oct 8). On Oct 9, IGV rose +2.81% and the cybersecurity ETF CIBR +3.58% (MarketScholars Oct 8, MarketScholars Oct 9).
- ZS: It reportedly reaffirmed guidance at its investor day. This comes from a low-authority aggregator (Wealth Awesome).
- (inference) This is a sector rotation, with money moving from AI hardware into AI-beneficiary software. It is not a single-company event.
2. Nuclear power / independent power producers
Breadth:
- Independent Power Producers: 3/7 (42.9%) up >=10% in 1W, liquid-name average 1W +11.7%.
- This is below the 8-stock minimum for the ranking, so it is not in the formal ranking. It is included because the catalyst is real.
- Renewable Utilities (CEG, GEV) liquid-name average 1W was only +1.3%, so the move is concentrated in nuclear-heavy names.
| Ticker | 1W | 1M | 3M |
|---|---|---|---|
| TLN* | +18.0% | +21.5% | -1.9% |
| CEG | +15.8% | +4.2% | +18.6% |
| VST | +15.3% | +9.8% | +1.6% |
| NRG | +13.4% | -3.3% | -23.1% |
*TLN does not pass the liquid-name filter.
Why:
- Oct 6: Google signed a 20-year PPA with Constellation. It funds uprates at 11 reactors in IL, PA and NJ, adding 890 MW, plus a separate 15-year, 2,700 MW supply agreement.
- CEG rose about +12–15% intraday, VST about +8–10%, and TLN about +7–12%.
- Evercore ISI called the deal positive for other IPPs with uprate candidates (CNBC, 24/7 Wall St, Stocktwits).
- VST also got a $4.2B DOE loan commitment for nuclear upgrades the same week (Benzinga).
- The 3M numbers are flat to negative (VST +1.6%, NRG -23.1%). (inference) This is a fresh re-ignition off a base, not an extended trend. Uranium is not participating (URA 1M -13.6%, CCJ 1M -9.6%, OKLO 1M -13.0%), so the trade is in nuclear generators, not fuel or SMRs.
3. Vaccines
Breadth:
- Biotechnology broadly is only 5.6% up >=10% in 1W (liquid-name average 1W -0.7%).
- The move is concentrated in vaccine names.
| Ticker | 1W | 1M | 3M |
|---|---|---|---|
| PCVX | +26.4% | +21.2% | +22.6% |
| NVAX | +21.9% | +37.1% | +36.7% |
| MRNA | +18.4% | +64.7% | +229.6% |
Why:
- Oct 5: Vaxcyte's pneumococcal vaccine VAX-31 met the main goals of a late-stage study in adults 50+. NVAX jumped about 20% in sympathy, its best day since January (Stocktwits).
- MRNA: It rose about 7% on Oct 5, partly tied to a pending Nasdaq-100 addition, with reports of a suspected plague outbreak in Russia also lifting the group (same source).
- On Oct 9 it rose about 9% intraday on reports of a public-private cancer-vaccine initiative involving the NIH. This is not clinical data or an approval (Vistapglobal).
- (inference) PCVX is a single-trial event. MRNA is the durable leader, with 3M at +229.6%.
4. Internet / consumer platforms
Breadth: Internet Content & Information: 9/62 (14.5%) up >=10% in 1W, up from 1.6% in the 10-06 snapshot. Only 4.8% are up >=25% in 1M, and the liquid-name average 1M is +1.2%.
| Ticker | 1W | 1M | 3M |
|---|---|---|---|
| SPOT | +11.9% | +1.4% | +10.3% |
| SNAP | +11.6% | +13.0% | +33.2% |
| PINS | +11.1% | +14.0% | -5.0% |
| GENI | +10.5% | -1.0% | +7.4% |
Why: No single catalyst found. Searches for SNAP, PINS and SPOT news this week returned nothing dated October 2026. (inference) This may be the same software/AI-beneficiary rotation spilling into ad platforms. It is weekly-only and not confirmed by 1M breadth.
5. Steel (US)
Breadth:
- Steel: 3/22 (13.6%) up >=10% in 1W and 3/22 up >=25% in 1M.
- Only 4 names pass the liquid-name filter, with a liquid-name average 1W of +5.4%.
| Ticker | 1W | 1M | 3M |
|---|---|---|---|
| CLF | +14.7% | +9.7% | +38.1% |
| NUE | +4.1% | -2.0% | +10.1% |
| GGB | +2.2% | +0.4% | +13.8% |
Why:
- Oct 5: CLF rose about +10% as the Stelco-shutdown fallout faded ahead of its Oct 19 Q3 report. BofA and JPMorgan raised targets to $13, citing auto demand, steel pricing and tariffs.
- NUE and STLD were up about 5% that day (24/7 Wall St).
- (inference) This is narrow, a single-leader pre-earnings move.
6. Brazil (event-driven, persistent)
This is not a theme. It is an election trade. The liquid names this week are:
- XP +49.9% (1M +61.3%)
- INTR +40.1%
- STNE +30.5%
- SBS +25.3%
- PAGS +23.7%
- NU +20.0%
- ITUB +18.3%
- PBR +16.9%
Why:
- In the Oct 4 first round, Flávio Bolsonaro took about 47%, beating polls that had Lula in the lead. Investors read a Bolsonaro win as less fiscal risk and lower rates.
- XP rose about +33% on Oct 5, its biggest one-day move as a US listing, and EWZ rose +13.3% (TIKR).
- The runoff is Oct 25. This is a binary one-off, not a sector theme.
Other one-offs (M&A, not themes)
- PCRX +44.0%: Viatris agreed to acquire it at $36.50/share cash (about $1.65B), announced Oct 8. The stock is now pinned to the deal price (TipRanks, MarketBeat). PCRX is part of the Specialty & Generic Drug weekly breadth (9.9%).
- RXO +24.4%: C.H. Robinson agreed to buy it for $30.25/share ($5.8B), announced Oct 5 (Mitrade). It drives Trucking's weekly 11.8%.
- PTC +35.0%: The Schneider takeover from the prior week is still inside the 1W window.
Monthly themes
Monthly ranking by liquid-name share up >=25% in 1M, >=50% in 3M and >=50% in 6M:
| Industry | Liquid names | 1M>=25% | 3M>=50% | 6M>=50% | avg 1M | avg 3M | avg 6M |
|---|---|---|---|---|---|---|---|
| Oil & Gas Refining | 10 | 0% | 50% | 80% | +8.5% | +41.1% | +72.3% |
| Healthcare Info Services | 13 | 8% | 31% | 69% | +14.1% | +24.6% | +87.6% |
| Diagnostics & Research | 15 | 27% | 13% | 60% | +12.3% | +32.3% | +95.8% |
| Software-Infrastructure | 53 | 19% | 9% | 49% | +10.3% | +13.5% | +68.2% |
| Computer Hardware | 17 | 18% | 12% | 47% | +4.0% | +19.0% | +75.6% |
| Software-Application | 68 | 10% | 16% | 38% | +6.1% | +16.4% | +54.1% |
Advertising Agencies (5 liquid names, 3M average +125.7%) is excluded as micro-cap noise, consistent with last issue.
1. Refiners (most durable; strength confirmed)
| Ticker | 1M | 3M | 6M | 1W |
|---|---|---|---|---|
| CVI | +19.4% | +87.3% | +89.3% | +5.8% |
| MPC | +16.0% | +60.4% | +104.4% | +7.7% |
| DINO | +12.6% | +55.4% | +110.9% | +7.0% |
| PBF | +9.3% | +58.5% | +107.2% | +4.3% |
| VLO | +12.5% | +54.5% | +81.6% | +6.8% |
| PSX | +7.6% | +47.7% | +74.7% | +5.1% |
Why:
- No single new catalyst found this week.
- The established driver is tight global refining capacity, from the Iran war, Ukrainian strikes on Russian refineries and lower fuel exports. Summer coverage put the WTI 3-2-1 crack near $59/bbl (MarketBeat).
- Diesel cracks seasonally peak from October through February (MarketGauge PDF).
- November crude was $91.45 on Oct 9 (Vistapglobal).
- Weekly breadth cooled: 0% up >=10% in 1W, vs 26.3% in the 10-06 snapshot. The liquid-name average 1W is still +4.4%.
2. Genomics / AI-bio tools: resting leaders (strongest consolidation setup)
| Ticker | 1M | 3M | 6M | 1W |
|---|---|---|---|---|
| CDNA | +27.3% | +123.3% | +296.7% | -5.2% |
| TXG | +21.5% | +88.7% | +246.6% | -13.7% |
| TWST | +26.0% | +76.3% | +233.5% | -15.3% |
| SDGR | +45.1% | +65.4% | +139.9% | -10.0% |
| VEEV | +13.5% | +55.8% | +95.6% | +8.3% |
| NTRA | +22.9% | +48.4% | +107.6% | -2.3% |
| ILMN | +38.2% | +46.3% | +130.0% | +1.9% |
| TEM | +20.8% | +21.8% | +65.2% | -7.4% |
Why:
- 10x Genomics began shipping its Atera spatial platform on Sep 29, and booked orders already exceed the 40 systems it expected to ship in 2026.
- An undated alert attributes a -13.6% TXG drop to profit-taking after that rally, with group weakness adding to it (Weiss Ratings).
- No single catalyst found for TWST's -15.3% week.
- (inference) The monthly trend is intact and the week is red. This is the "leaders of a growing industry while consolidating" setup, now in its second straight red week for TXG and TWST.
3. Software / cybersecurity (durable and re-accelerating)
| Ticker | 1M | 3M | 6M | 1W |
|---|---|---|---|---|
| OKTA | +35.7% | +67.4% | +268.9% | +9.8% |
| RBRK | +40.7% | +48.3% | +185.6% | +5.5% |
| CRWD | +31.7% | +46.9% | +190.2% | +1.9% |
| S | +32.6% | +46.9% | +120.0% | +4.8% |
| DDOG | +32.3% | +13.9% | +178.3% | +5.8% |
| PANW | +23.7% | +28.5% | +168.9% | +3.9% |
| ZS | +43.0% | +67.8% | +98.0% | +18.9% |
Why:
- See weekly theme #1: the Oct 6 software highs, the Deutsche Bank upgrade, and 2026 EPS growth estimates up to 20.6%.
- Reuters notes CRWD, FTNT and PANW are up triple digits this year on AI-era security spending (Kitco/Reuters).
- Software-Infrastructure 1M >=25% breadth rose from 8.3% to 10.3% of all names, and the liquid-name average 1M rose from +6.6% to +10.3% since the 10-06 snapshot.
4. AI storage / servers
| Ticker | 1M | 3M | 6M | 1W |
|---|---|---|---|---|
| QMCO | +32.1% | +203.6% | +403.7% | -11.8% |
| P (Everpure) | +64.2% | +94.7% | +153.5% | +10.2% |
| SMCI | +12.0% | +47.8% | +65.7% | -4.2% |
| NTAP | +29.2% | +40.4% | +147.2% | +4.8% |
| DELL | +15.7% | +34.8% | +229.7% | +4.2% |
| HPE | +33.0% | +51.3% | +195.1% | +6.0% |
Why: No single catalyst found this week; searches returned no October 2026 Everpure news. The Computer Hardware liquid-name average 1W was -5.5%, dragged down by quantum names (IONQ -8.9%, QBTS -7.6%, RGTI -8.0%, INFQ -16.0%) and by STX -7.8% and WDC -4.3%. (inference) Within the group, P and NTAP held, while the memory and HDD names joined the chip selloff.
5. AI semis / optical: durable theme pulling back
| Ticker | 1M | 3M | 6M | 1W |
|---|---|---|---|---|
| MXL | +38.7% | +5.3% | +364.8% | -9.2% |
| CRDO | +35.1% | -16.0% | +81.1% | -1.0% |
| CIEN | +34.4% | -2.4% | -9.3% | +14.9% |
| MRVL | +21.3% | +16.7% | +114.2% | +1.1% |
| AMD | +20.8% | +9.0% | +148.2% | -4.1% |
| ALAB | +20.3% | -17.1% | +129.6% | -2.3% |
| LITE | +17.9% | +37.6% | +23.0% | +1.7% |
Why:
- Oct 8: An FT report said OpenAI's annualized revenue run-rate was near $50B in September, vs the roughly $70B figures circulating. SMH fell -2.84% and DRAM -5.13% that day (MarketScholars).
- Weekly recaps put SMH at about -4.2% to -4.3% for the week. Separately, a report of Apple cutting iPhone 18 Pro component orders hit SWKS (The Glass Desk).
- On the bullish side, the Lumentum CEO said optical components are "sold out through 2029" (CNBC, cited by Vistapglobal).
- Breadth flipped hard:
- Semiconductors went from 15.8% to 2.0% up >=10% in 1W.
- Communication Equipment went from 22.2% to 1.9%.
- The semis liquid-name average 1M is still +8.1%.
- (inference) A strong monthly trend with a red week on a sentiment headline, not an earnings miss, is the resting-leaders setup. CIEN (+14.9% 1W) is the one optical name still pushing.
Weekly vs monthly
| Theme | Weekly | Monthly | Read |
|---|---|---|---|
| Software / cybersecurity | Hot (SW-Infra 13.1% at >=10% 1W) | Strong (19% of liquid names at >=25% 1M; 49% at >=50% 6M) | Durable and re-accelerating; rotation winner |
| Nuclear IPPs (CEG/VST/TLN) | Hot (+15–18%) | 1M flat, 3M flat/negative | New; deal-driven ignition off a base |
| Vaccines (PCVX/NVAX/MRNA) | Hot (+18–26%) | MRNA only (3M +229.6%) | PCVX trial one-off; MRNA durable |
| Internet / ad platforms | Hot (14.5% at >=10% 1W) | Weak (liquid-name avg 1M +1.2%) | Weekly-only; no catalyst found |
| US steel (CLF) | Hot (CLF +14.7%) | 3M +38.1% (CLF only) | Single-leader pre-earnings (Oct 19) |
| Brazil ADRs | Very hot (+17–50%) | n/a | Election one-off; runoff Oct 25 |
| Refiners | Cooling (0% at >=10% 1W) | #1 durable (80% at >=50% 6M) | Extended trend resting at highs |
| Genomics / AI-bio tools | Red (TXG -13.7%, TWST -15.3%) | Strong (3M +65–123%) | Durable theme pulling back = resting leaders |
| AI semis / optical | Red (semis liquid-name 1W -7.4%) | 1M +8.1% avg; leaders +20–39% | Durable theme pulling back = resting leaders |
| AI storage / servers | Mixed (P +10.2%, QMCO -11.8%) | Strong (6M +66–404%) | Durable; P still leading |
What changed since last week
Caveat: The prior snapshot is week_end 2026-10-06, only 3 sessions earlier, so the two 1W windows overlap (Oct 5–6 is in both). The changes below are mostly the Oct 7–9 sessions.
NEW:
- Nuclear power IPPs: CEG, VST, TLN and NRG, on the Google–Constellation PPA and VST's DOE loan.
- Vaccines: PCVX VAX-31 Phase 3, plus NVAX and MRNA.
- Internet / ad platforms: Internet Content weekly breadth went from 1.6% to 14.5%. No catalyst found.
- M&A one-offs: PCRX (Viatris) and RXO (C.H. Robinson).
PERSISTENT:
- Software / cybersecurity. Last issue called it "cooling"; it re-accelerated. ZS went to +18.9% 1W, and the Software-Infrastructure liquid-name average 1M rose from +6.6% to +10.3%.
- Refiners: monthly durable, weekly cooled.
- Genomics / AI-bio tools: second red week.
- AI storage / servers: P still leading.
- Brazil: XP 1W rose from +46.7% to +49.9%. The event runs until the Oct 25 runoff.
- Steel: CLF-led.
DROPPED / COOLING:
- AI optical / networking as a weekly theme. Communication Equipment weekly breadth fell from 22.2% to 1.9%. AAOI went from +29.3% to -5.1% on the 1W window. CIEN is the exception.
- Power / analog semis: reversed. ON 1W went from +13.6% to -8.7%, VSH from +16.6% to -10.8%, WOLF from +13.2% to -13.2%, and STM from +10.3% to -9.1%.
- Grid E&C bounce: faded. Engineering & Construction weekly breadth fell from 15.7% to 7.8%, and the liquid-name average 1W went from +1.9% to -2.0%.
- Still weak: gold (GDX 1M -7.0%), uranium (URA 1M -13.6%), solar (TAN 3M -20.4%), defense (ITA 3M -13.6%) and Agricultural Inputs (CTVA artifact noted above).
Sources
- Kitco/Reuters: US software stocks scale fresh 2026 highs as AI disruption worries fade (Oct 6)
- iTiger: Software AI-disruption fears abate; Deutsche Bank upgrade, hedge-fund buying
- MarketScholars: OpenAI revenue questions hit chips (Oct 8)
- MarketScholars: OpenAI relief meets a split rally (Oct 9)
- The Glass Desk: Weekly market review 2026-10-09
- TheStreet: Stock market today, Oct 9 2026
- Vistapglobal: Weekly market summary, Oct 9 2026
- Wealth Awesome: Why Zscaler stock is rising (Oct 6)
- CNBC: Google–Constellation nuclear deal (Oct 6)
- 24/7 Wall St: CEG +12%, VST +8%, TLN +7% on Google deal
- Stocktwits: CEG, VST, TLN jump on Google power deal
- Benzinga: What's going on with Vistra stock (DOE loan)
- Stocktwits: NVAX outruns Moderna as Vaxcyte's shot clears late-stage test (Oct 5)
- TIKR: XP soars 33% as Brazilian stocks rally on election result
- 24/7 Wall St: Cleveland-Cliffs jumps 10% before Oct 19 earnings
- TipRanks: Why Pacira (PCRX) is up 44% (Viatris deal)
- MarketBeat: PCRX unusually high volume (Oct 9)
- Mitrade: Why RXO stock soared (Oct 5)
- MarketBeat: Refiner stocks near record highs on Iran-driven margins
- MarketGauge: Crack spreads, the refiner's margin decoded (PDF)
- Weiss Ratings: 10x Genomics down 13.6%