On this page
Related articles
Articles that name today’s leaders, then explainers for the concepts that came up.
Gap up, gap down, and premarket change: which price are you comparing?Learn how gap up and gap down are calculated, how opening gaps differ from premarket changes, and why the reference price and timestamp matter.
What Time Do Small-Cap Gappers Hit Their High of Day?A look at 671 US stock gap-ups of 20% or more from July 1 to October 2, 2026: when the 4:00 a.m.–8:00 p.m. ET high printed, split by gap size, price and how the day ended.
A stock suddenly moves: how do you establish what happened?Research why a stock moved using company announcements, SEC filings, and a source-linked timeline. Separate confirmed events from explanations and unknowns.
Retrospective data built after the session from stored records, with links to the original sources. Not real-time, not investment advice and not a recommendation to buy or sell any security.