CBOE put/call ratio history for one ratio type, newest first. Only rows whose ratio reconciles with its own volumes are served. Data runs from late 2006 to present; the Vix ratio type starts October 2019, and pre-2013 history is sampled roughly weekly.

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.