Published Sep 23, 2026, 4:33 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 two moved together, so the session was not a story about the largest companies.
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.
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 5.5%, at or above the 3% floor for this strip
CEO warned of persistent inflation and flat traffic, weighing on shares after the investor day.
News event dated 2026-09-23, CNBC Top News: McDonald's CEO Warns of Persistent Inflation and Flat Traffic Headwinds
Moved 4.8%, at or above the 3% floor for this strip
Shares rallied on reported quantum computing breakthrough news dated the same session.
News event dated 2026-09-23, CNBC Top News: IonQ Shares Rally on Quantum Computing Breakthrough
Moved 4.4%, at or above the 3% floor for this strip
Company overhauled its treadmill lineup as part of a turnaround push, coinciding with the decline.
News event dated 2026-09-23, CNBC Top News: Peloton Overhauls Treadmill Lineup in Turnaround Push
Moved 4.4%, 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 3.8%, 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 3.7%, at or above the 3% floor for this strip
Stock staged a comeback to year highs tied to real world AI adoption narrative.
News event dated 2026-09-23, MarketWatch Top Stories: Palantir Stock Stages Dramatic Comeback to Year Highs on Real-World AI Boom
Moved 3.7%, 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.
The Russell 2000 fell 1.77% and the Nasdaq fell 1.13%, both well below the S&P 500's 0.75% decline, showing the broader market move was sharper outside the headline index.
Only 3 of 8 tracked indices sit above their 50-day average, unchanged in narrowness from the prior session despite this session's broader decline across comparison indices.
Sector performance was uniformly negative apart from Energy up 0.96%, with Utilities down 1.92% and Real Estate down 1.55% leading declines, a contrast to the prior session's split sector tone.
VIX rose 6.83% while Fear and Greed fell 2.78%, both readings pointing toward increased caution, unlike the prior session when both moved toward reduced anxiety.
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.