On this page
Related articles
Articles that name today’s leaders, then explainers for the concepts that came up.
LU and LD explained: from LULD price bands to trading pausesLearn how limit up and limit down work in U.S. stocks: moving LULD bands, the 15-second limit state, reopening, and differences from SSR and news halts.
Reg SHO explained: threshold lists, FTDs, and the 13-day misconceptionUnderstand Reg SHO threshold-list criteria, failures to deliver (FTDs), listing dates, and the 13-day misconception. Compare SSR and locates; check original sources.
SSR explained: the 10% trigger, duration, and short-sale price testLearn how the short-sale restriction (SSR) works: the 10% trigger, next-day duration, national best bid test, and differences from locates and Reg SHO lists.
What is a SPAC? From the IPO to redemptions and the de-SPAC mergerWhat is a SPAC? Learn how its IPO and de-SPAC merger work, why $10 is not a price floor, and how redemptions, PIPEs, warrants and dilution change the picture.
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.
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.