Lab · Sector Dispersion
Breadth vs the sector.
Most screens show the sector's price. These show what its members are doing underneath — is the move broad, or carried by a few mega-caps? Median constituent vs the index, advancers vs decliners, how many names beat the index, and a cumulative advance/decline line that tends to turn before price. 40 ETFs & index cuts · closes through 2026-09-17.
What changed below the surface · 21-day
Where the constituents' advance/decline is pulling away from the ETF's price — the early read, before the headline reflects it.
Improving — breadth rising under flat/soft price
Weakening — breadth falling under firm price
- IGViShares Expanded Tech-Softwareprice +3.75% · A/D 1m -1.36 · 1q +2.57 /nm
- CIBRFirst Trust Nasdaq Cybersecurityprice +4.33% · A/D 1m -1.24 · 1q +2.32 /nm
- QTOPiShares Nasdaq-100 Top 30price +1.37% · A/D 1m -1.23 · 1q -2.16 /nm
- AW40Agentic Winners 40 (EW)price +0.45% · A/D 1m -1.21 · 1q +2.53 /nm
- XLVHealth Care Select Sectorprice -0.54% · A/D 1m -1.2 · 1q +3.31 /nm
- AIQGlobal X AI & Technologyprice +2.94% · A/D 1m -0.83 · 1q -0.67 /nm
- XLCCommunication Services Select Sectorprice +1.69% · A/D 1m -0.61 · 1q +2.17 /nm
- XLKTechnology Select Sectorprice +1.31% · A/D 1m -0.58 · 1q +0.56 /nm
- AEIAgentic Ecosystem Index (EW)price +3.92% · A/D 1m -0.56 · 1q -0.18 /nm
- IXNiShares Global Techprice +2.1% · A/D 1m -0.54 · 1q +0.55 /nm
- IXPGlobal Communicationsprice +4.07% · A/D 1m -0.41 · 1q +0.95 /nm
- WTAIWisdomTree AI & Innovationprice -0.24% · A/D 1m -0.38 · 1q -0.3 /nm
- ARKKARK Innovationprice +9.82% · A/D 1m -0.31 · 1q -1.95 /nm
Closelook indices
S&P 500 sectors
Nasdaq-100 cuts
Tech & thematics
Global
Computed across the constituents we cover in our data lake (coverage shown per card). A/D line = cumulative daily advancers minus decliners. Decision-support, not investment advice.
FAQ · from the current data · as of 2026-09-17
Quick answers
What does this dispersion tool measure?
For each ETF or index it compares the median constituent return to the ETF/benchmark return, counts advancers versus decliners, and tracks a cumulative advance/decline line that tends to lead price — showing whether a move is broad-based or carried by a handful of mega-caps.
How many ETFs and index cuts are tracked, and as of when?
40 ETFs and index cuts across five groups — Closelook indices, S&P 500 sectors, Nasdaq-100 cuts, tech & thematics, and global — with closes through 2026-09-17.
Which sector shows the widest breadth divergence today?
As of 2026-09-17, ARKK (ARK Innovation) shows the widest gap between its median constituent and the ETF itself: median -1.50pp versus the ETF's +4.50%, with 37 advancers against 5 decliners.
Which sectors are improving or weakening on a 21-day view?
As of 2026-09-17, 2 ETFs show improving breadth (advance/decline rising under flat or soft price), led by MXI, and 13 show weakening breadth (advance/decline falling under firm price), led by IGV.
How is the advance/decline line computed?
It is the cumulative daily count of constituent advancers minus decliners, computed across the constituents held in the Closelook data lake — coverage is shown per ETF card.