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It's actually written on the treasury page Negative Yields and Nominal Constant Maturity Treasury Series Rates (CMTs): At times, financial market conditions, in conjunction with extraordinary low levels of interest rates, may result in negative yields for some Treasury securities trading in the secondary market. Negative yields for Treasury ...


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FINRA publishes a start-of-day and end of day file containing the symbol and issuer of all NMS securities. https://www.catnmsplan.com/reference-data https://files.catnmsplan.com/symbol-master/FINRACATReportableEquitySecurities_SOD.txt https://files.catnmsplan.com/symbol-master/FINRACATReportableEquitySecurities_EOD.txt Due to the relevance of these files ...


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QuantRocket supports this. The usage guide explains how to get comprehensive lists of symbols for numerous global exchanges. Disclaimer: I am affiliated with QuantRocket.


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If you only need end-of-day data then Google or Yahoo finance will should be fine. If you are looking for intraday data then there are only paid sources. Tickdata.com has good global coverage for tick-level data but it is expensive. You might try eoddata.com if you only need 1-min bars and higher as they have good global coverage and reasonable prices.


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Have you considered storing it by adding the additional fields ('level' or 'depth') and ('type'), then you can have a table which looks like this; time size price depth type xxx 100 100.03 1 bid xxx 2000 100.025 2 bid xxx 0 100.02 3 bid xxx 33 100.035 1 offer xxx 45 100....


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