Answering this question is relevant to assess the quality of a time series in order to observe whether the data vendor applies some rounding to the data or is more decimal are present than the actual tick size.
Please provide possibly the official source (e.g. www.nasdaq.com, www.nyse.com)
Answer
In case of NYSE equities rule 7.6 reads: "The minimum price variation ("MPV") for quoting and entry of orders in securities traded on the NYSE Arca Marketplace is USD 0.01, with the exception of securities that are priced less than USD 1.00 for which the MPV for quoting and entry of orders is USD 0.0001."
For NASDAQ equities rule 4701 (k) reads: "The term "minimum price increment" means USD 0.01 in the case of a System Security priced at USD 1 or more per share, and USD 0.0001 in the case of a System Security priced at less than USD 1 per share."
In addition there is the SEC tick size pilot program (FINRA, SEC) which you can find embedded in the rule books as well.
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