US equity market holidays and early-close (1:00 p.m. ET) half days for a calendar year (NYSE/Nasdaq), in date order. Defaults to the current year. The calendar is curated for 2025 through 2027; a year outside that range is rejected.

What happened to a requested ticker that no longer trades. "delisted": the company has no current US listing, so the answer is its history. "renamed": the company now trades as successorTicker, its current US presentation ticker (possibly another share class). A listed series (short volume, short interest, off-exchange volume, fails-to-deliver, congressional trades) is the retired ticker's own; a company-level read is the company's data.