Independence Day is an annual NYSE holiday closure published by New York Stock Exchange LLC, which operates as NYSE Group. NYSE Group is a wholly-owned subsidiary of Intercontinental Exchange (NYSE: ICE). The entry appears in the Holidays and Trading Hours calendar and the annual holiday release, and it is governed by NYSE Rule 7.2. It covers all NYSE markets once each year.
These are the five cash equity markets: New York Stock Exchange, NYSE American, NYSE Arca Equities, NYSE Chicago and NYSE National. The release also names NYSE American Options, NYSE Arca Options and NYSE Bonds.
The entry is only a market-status item, open versus closed. It is not an economic statistic, survey, index or rate. So it has no level, value, sample, panel, weighting or seasonal adjustment, and it states no thresholds. It says nothing about the economy or market performance.
It is not the federal holiday law itself, and it is not the bond market schedule, whose early-close times can differ.