Stock & options data FAQ

What does the stock data cover?

HistoricalData.net provides daily and 1-minute CSV bars for US stocks and ETFs since October 2003, including active and delisted securities. Available dates vary by security. See stock coverage and datasets.

What does the options data cover?

HistoricalData.net provides end-of-day option chains on US stocks, ETFs and indices, with archive history dating to February 2002. The CSV files have 34 columns covering quotes, trading activity, computed Greeks and implied volatility. Coverage and field availability vary by date and contract. See options coverage and datasets.

Does the options archive include index options?

The HistoricalData.net options archive includes index options such as SPX, SPXW, XSP, VIX, RUT, NDX, DJX and OEX. Historical coverage varies by index. The options lookup checks the latest published trading session; it does not establish an index's historical start or end date. Email info@historicaldata.net to confirm a historical research window.

Does the stock archive include delisted securities?

The HistoricalData.net stock archive retains available histories of delisted securities within its coverage period beginning in October 2003, including their last recorded trading day. Available dates vary by security. See delisted stocks and survivorship bias.

How does the stock archive handle reused ticker symbols?

The HistoricalData.net stock archive keeps distinct listing lifetimes separate wherever the available records identify them. A ticker can belong to different companies at different times, so check the company and date range before joining files under one symbol. See how reused tickers are handled.

Can I check stock or options coverage before buying?

The HistoricalData.net coverage lookup returns matching stock daily files and their first and last recorded dates, or an option root's contract count for the latest published trading session. The options result does not provide historical start and end dates. To confirm a particular research window or list of securities, email info@historicaldata.net.

Can I try the stock and options data before buying?

HistoricalData.net offers free stock and options samples containing real CSV files from July–December 2022, with all columns in the paid archives' format. The stock sample covers TSLA, KO, SPY and TWTR; the options sample covers TSLA, KO, SPY and SPX, including SPXW. Each ZIP includes a README and verification script.

What file format is used for stock and options delivery?

HistoricalData.net delivers paid stock and options data as plain CSV files. Stock historical archives have one file per security for each frequency; options have one file per trading day. The files can be read with pandas, R, databases or spreadsheets, subject to each application's size and row limits. Python is required only for the supplied Python tools.

How much storage do the full stock and options archives require?

HistoricalData.net full-archive sizes below measure uncompressed CSV files at each product's stated data date. Paid data files are downloaded individually as CSV; free samples are packaged as ZIPs.

Sizes grow as files are added or revised. The stock minute-bar size excludes the separately included daily-bar archive. Allow additional space for any databases or derived files you create.

Where does the stock and options data come from?

HistoricalData.net stock bars use consolidated trade data from US exchanges and reporting venues, including off-exchange reporting and OTC markets. The options archive combines historical end-of-day records with ongoing daily capture from 6 August 2026. See data sources and processing methods.

Is an archive purchase a subscription?

HistoricalData.net stock and options archives are one-time purchases of historical files with a limited period of updates included. Continued updates require a separate subscription. Downloaded files remain usable under the purchased license after the included update period ends.

Do updates included with an archive purchase renew automatically?

Updates included with HistoricalData.net archive purchases end without automatic renewal or further charges. Stock archives and the 10-year and full options archives include 2 months of updates; the 1-year options archive includes 1 month. The included period starts at purchase. Continued updates require a separate subscription.

Does an update subscription include the historical archive?

HistoricalData.net update subscriptions provide recent and new trading days, starting with the latest three weeks of data. A subscription does not include the full historical archive, which is purchased separately. See stock products and options products.

Can I keep downloaded files after cancelling an update subscription?

Cancelling a HistoricalData.net update subscription stops future billing but does not remove the right to use previously downloaded files under the purchased license. The subscription month already billed is not refunded. See subscription and refund terms.

How often are the stock and options datasets updated?

HistoricalData.net stock and options updates add data for US trading days as files are published. Historical archives and recent update files can have different cut-off dates. The file manifest available through each download link identifies the dates actually published in that collection.

How much do the stock and options datasets cost?

HistoricalData.net single-user stock archives cost USD $399 for daily bars or USD $699 for 1-minute bars with daily bars included. Options archives cost USD $199 for the most recent 1 year, USD $699 for the most recent 10 years or USD $999 for the full archive. Separate monthly update subscriptions cost USD $39 for stock daily bars, USD $69 for stock minute bars or USD $79 for options. See license sizes and the stock and options product tables.

Can I buy individual years of stock or options data?

HistoricalData.net options archives are available as the most recent 1 year, the most recent 10 years or the full archive. The 1-year and 10-year windows are counted back from the purchase date. Stock daily and minute archives each include all available history from October 2003. Custom selections of individual calendar years are not offered.

How do I receive purchased stock or options data?

After successful payment for HistoricalData.net stock or options data, download links appear immediately on the purchase confirmation page and are also sent to the email address used at checkout. The links open the purchased files for download.

How long are archive download links valid?

All HistoricalData.net stock and options archive download links are valid for 21 days from purchase. Included updates use a separate link valid for the included update period. For a free replacement of an expired archive link, email info@historicaldata.net from the purchase email address. Replacing or extending a download link does not restart or extend the 21-day archive refund application period.

Does a data purchase include an emailed receipt?

A receipt for a successful HistoricalData.net purchase is emailed to the address used at checkout. For a replacement receipt or a receipt-related question, email info@historicaldata.net from the purchase email address.

What should I do if a data download fails?

HistoricalData.net provides free replacement download links and help with failed transfers or files that do not match the documented format or coverage. Email info@historicaldata.net for assistance. If HistoricalData.net cannot make the purchased data available, the purchase is refunded in full.

What is the refund policy for stock and options archives?

Requests for full or partial usage-based refunds on HistoricalData.net archive purchases must be submitted within 21 days of purchase. If no data has been downloaded, the refund is 100%. Stock usage is counted by data file. An options calendar month counts only when all daily files available for that month within the purchased archive have been downloaded; a partially downloaded month counts as zero months. If no options month has been fully downloaded, the usage-based refund is 100%. Documentation and manifests do not count as data downloads. See the refund table and separate subscription terms.

Are stock prices adjusted for splits and dividends?

HistoricalData.net per-security stock history files contain raw prices alongside split- and dividend-adjusted values, with recorded dividend amounts and split ratios. Stock files organized by trading day are point-in-time records whose adjusted columns equal their raw values. See adjustment formulas and file conventions.

Do stock files include pre-market and after-hours trading?

HistoricalData.net stock minute bars cover 04:00–20:00 US Eastern time, with session labels for pre-market, regular and after-hours trading. Stock daily OHLC covers the regular session; daily volume and VWAP cover the whole trading day. See session definitions.

What time zones do stock and options files use?

HistoricalData.net stock minute timestamps use US Eastern time, following EST and EDT. Stock session labels follow the exchange calendar, including early closes. In options files, quote_time uses ISO-8601 UTC timestamps, while quote_date identifies the trading date. See time and session conventions.

Are end-of-day option quotes synchronized at the market close?

HistoricalData.net end-of-day option rows are not synchronized to one market-close timestamp. Each contract records its own last standing quote. From 6 August 2026, quote_time records the quote's last update when available; that timestamp can precede the file date. See what an options row represents.

What do blank fields in stock and options CSV files mean?

Blank fields in HistoricalData.net stock and options CSV files represent missing or inapplicable values, not zeros. Depending on the column, a blank can indicate historical unavailability, no relevant trade or event, a missing input, or an unsuccessful calculation. See the stock and options field definitions for column-specific rules.

What does iv_flag mean in options files?

The iv_flag field in HistoricalData.net options files describes the midpoint implied-volatility calculation. Values 0 and 1 mean midpoint IV and all five Greeks are present; values 2–7 mean those fields are blank. Bid-side and ask-side IV are solved independently and are not governed by iv_flag. See IV status definitions for each code.

Why can an options row have quotes but no closing trade price?

HistoricalData.net options rows can contain bid/ask quotes without a closing trade price when the contract did not trade that day. Trade-price fields can therefore be blank while quote fields remain usable. Read close alongside volume and last_trade_date; see historical trade-field notes.

How can I keep a local stock or options collection updated?

The supplied HistoricalData.net update.py tool uses an active download link to fetch available stock or options updates, check published file checksums and apply supported corrections. Stock adjustments can change earlier rows after a dividend or split, so maintaining adjusted history requires more than appending new rows. Follow the product README and adjustment and revision rules.

Can an AI assistant query HistoricalData.net coverage?

HistoricalData.net provides a REST API and an MCP service for coverage queries. Stock queries return matching daily-file date ranges; options queries return contract counts for the latest published trading session. The coverage service does not deliver purchased CSV data, which uses the buyer's download link. See Coverage API & MCP for endpoint URLs, supported queries and setup.

How does the number of data users affect the license price?

HistoricalData.net offers Single user, Team (up to 10 people at twice the single-user price), and Organization (no seat limit within one legal entity at three times the single-user price) licenses. Anyone who can access the files or a database loaded from them counts as a user; someone who only reads a report or chart does not. See license terms.

Can HistoricalData.net data be used commercially?

HistoricalData.net licenses permit commercial trading, research, analysis, models and products within the purchased license scope, but prohibit redistribution of the data or outputs that enable reconstruction of a substantial part of it. Each license covers its licensee and permitted users; an Organization license covers one legal entity, and group companies need their own licenses. See permitted uses and restrictions.

Can I publish research or results based on HistoricalData.net data?

HistoricalData.net licenses permit publication of statistics, charts, model outputs and backtest results that do not enable reconstruction of a substantial part of the data. Published research, including papers and public research reports, must credit HistoricalData.net with a link where the format allows. Internal work, commercial products, client deliverables and trading do not otherwise require attribution. See publication and credit terms.