Published Sep 30, 2026, 4:29 PM ET
Today's move, what drove it, and what the available information cannot explain.
Capitalisation weighted, so a move in the largest companies moves it more than a move in the smallest.
Every Nasdaq listing, weighted by capitalisation and heavy in technology.
Thirty names weighted by price rather than by capitalisation, so it can disagree with the S&P for arithmetic reasons alone.
Small capitalisation names. Read against the S&P, it is the size half of how broad a day was.
The same five hundred companies weighted equally, so the largest names count no more than the smallest. Read against the cap-weighted index, the gap is how much of the day belonged to the biggest companies.
The cap-weighted index outran the equal-weighted one, so the largest companies carried more of the session than their number.
38%
3 of 8 tracked indices above their 50-day average
Counted over ^GSPC, ^IXIC, ^DJI, ^RUT, ^FTSE, ^N225, ^GDAXI, 000001.SS. This is a reading across whole market indices, not a count of the companies inside any one of them.
CNN's own index, stored at the close. Context for whether sentiment confirms the tape or contradicts it.
Expected thirty day volatility from S&P 500 options. Rising with the index is the contradiction worth seeing.
Citi downgraded Moderna after its large run-up, citing valuation concerns, coinciding with the sharp decline.
News event dated 2026-09-30, MarketWatch Top Stories: Citi downgrades Moderna after 600%-plus gains, citing unjustified valuations
Moved 5.4%, at or above the 3% floor for this strip
The evidence read for this company over the 7 days before the session was its own SEC filings, its stored corporate actions, the headline feed collected for its ticker and the clustered news events this system collects every two hours across every category. Rows naming this company were read inside that window and none of them was resolved to this session's move.
Moved 4.2%, at or above the 3% floor for this strip
Reports of CEO Ryan Cohen extending his buying streak align with the stock's gain.
Headline dated 2026-09-30: GameStop Stock Climbs as CEO Ryan Cohen Extends His Buying Streak - benzinga.com
Moved 3.7%, at or above the 3% floor for this strip
News that Intel's Altera unit could get a fresh valuation with AMD as a rival bidder coincides with the gain.
News event dated 2026-09-30, Yahoo Finance: Intel's Altera unit could get fresh valuation, with AMD seen as key rival
Moved 3.7%, at or above the 3% floor for this strip
The evidence read for this company over the 7 days before the session was its own SEC filings, its stored corporate actions, the headline feed collected for its ticker and the clustered news events this system collects every two hours across every category. Rows naming this company were read inside that window and none of them was resolved to this session's move.
Moved 3.5%, at or above the 3% floor for this strip
The evidence read for this company over the 7 days before the session was its own SEC filings, its stored corporate actions, the headline feed collected for its ticker and the clustered news events this system collects every two hours across every category. Rows naming this company were read inside that window and none of them was resolved to this session's move.
Moved 3.2%, at or above the 3% floor for this strip
Built in code from the movers whose evidence did not resolve, so no written summary can shorten this list.
Participation fell to 2 of 8 tracked indices above their 50-day average from 3 of 8 last session, showing narrower breadth even as the S&P 500 move stayed modest.
Sector performance split widely, with Technology up 0.64% against Consumer Staples down 1.53%, a broader range than the prior session's Utilities to Materials spread.
VIX rose 2.99% while Fear and Greed held flat at 32, showing rising volatility without any change in the sentiment gauge itself.
The Nasdaq Composite rose 0.24% while the Dow Jones fell 0.86%, a wider large-cap divergence than the prior session's narrower spread across indices.
One session, from the stored closes of the eleven sector ETFs. Each bar is scaled against the widest move of the day, so the shape is the spread and not an absolute size.