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Many friends can't afford a Bloomberg terminal, particularly when the pandemic has unemployed some of them. This answer can't assist them. How else can amateur investors determine the number of shorted shares for a corporation?

This Investopedia article suggests that they must pay their discount brokerage for this data? But do discount brokers even list daily short interest? I'm assuming any brokerage costs are less than a Bloomberg terminal.

The free data is updated just twice a month. Short interest tables will show information for the last two reporting dates. Daily short interest data is available but can only be purchased through a subscription.

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FINRA reports short volume and total volume on a subset of trades reported to its reporting facilities. Quoting FINRA, the data:

  (1) does not include any trades that are not publicly disseminated, 
  (2) is not consolidated with exchange data, and 
  (3) does not—and is not intended to—equate to short interest position information.

You can view historical data on GME and other symbols in this visualization

GME Short Volume

To download archives from NYSE:

wget -vvv --no-parent --recursive --level=2 --accept=.txt \
--no-directories ftp://ftp.nyxdata.com/ShortData/NYSEshvol/current

Top-50 by Short Volume on Jan-29. GME is ranked 43:

| dt         | symbol | short_vol | total_vol | short_vol_% |
|------------|--------|----------:|----------:|------------:|
| 2021-01-29 | SNDL   | 255689121 | 475322606 |        53.8 |
| 2021-01-29 | AMC    | 147053814 | 285512338 |        51.5 |
| 2021-01-29 | NAKD   | 130376400 | 250377016 |        52.1 |
| 2021-01-29 | CATB   |  88019172 | 186209530 |        47.3 |
| 2021-01-29 | CTRM   |  66297030 | 133717565 |        49.6 |
| 2021-01-29 | NOK    |  53711194 | 152948886 |        35.1 |
| 2021-01-29 | GTE    |  27725882 |  50123103 |        55.3 |
| 2021-01-29 | AAPL   |  27354158 |  79187985 |        34.5 |
| 2021-01-29 | NAK    |  24833606 |  46842197 |        53.0 |
| 2021-01-29 | ZOM    |  24376676 |  45657956 |        53.4 |
| 2021-01-29 | LMFA   |  21944109 |  40080570 |        54.7 |
| 2021-01-29 | GNUS   |  21644515 |  41826558 |        51.7 |
| 2021-01-29 | UVXY   |  20743744 |  79407556 |        26.1 |
| 2021-01-29 | SOS    |  16088533 |  46631095 |        34.5 |
| 2021-01-29 | SPY    |  15698791 |  25795811 |        60.9 |
| 2021-01-29 | AAL    |  15665027 |  45389480 |        34.5 |
| 2021-01-29 | VXRT   |  15637860 |  36938038 |        42.3 |
| 2021-01-29 | NIO    |  14792052 |  40733405 |        36.3 |
| 2021-01-29 | TRX    |  14687288 |  41716348 |        35.2 |
| 2021-01-29 | BB     |  14683994 |  38688694 |        38.0 |
| 2021-01-29 | SQQQ   |  14666607 |  48865446 |        30.0 |
| 2021-01-29 | NMTR   |  13979629 |  25901939 |        54.0 |
| 2021-01-29 | SHIP   |  13733182 |  28301043 |        48.5 |
| 2021-01-29 | TOPS   |  13541423 |  23691414 |        57.2 |
| 2021-01-29 | EXPR   |  13433628 |  25304445 |        53.1 |
| 2021-01-29 | SLV    |  13402058 |  31189141 |        43.0 |
| 2021-01-29 | JAGX   |  12784280 |  25936977 |        49.3 |
| 2021-01-29 | GE     |  11856734 |  43054245 |        27.5 |
| 2021-01-29 | HYG    |  11657915 |  16485402 |        70.7 |
| 2021-01-29 | AIKI   |  11297734 |  20401543 |        55.4 |
| 2021-01-29 | MARA   |  11140822 |  20035757 |        55.6 |
| 2021-01-29 | BNGO   |  10550275 |  20531616 |        51.4 |
| 2021-01-29 | SENS   |  10492468 |  20885436 |        50.2 |
| 2021-01-29 | TNXP   |  10416933 |  19741409 |        52.8 |
| 2021-01-29 | PLTR   |  10293959 |  18942966 |        54.3 |
| 2021-01-29 | AAU    |   9652743 |  18314149 |        52.7 |
| 2021-01-29 | PHUN   |   9605440 |  19311343 |        49.7 |
| 2021-01-29 | MUX    |   9174288 |  18127181 |        50.6 |
| 2021-01-29 | TLRY   |   9156301 |  15952683 |        57.4 |
| 2021-01-29 | VXX    |   9059395 |  27222555 |        33.3 |
| 2021-01-29 | F      |   9030503 |  25513486 |        35.4 |
| 2021-01-29 | TZA    |   8841975 |  26090511 |        33.9 |
| 2021-01-29 | GME    |   8814229 |  16327706 |        54.0 |
| 2021-01-29 | XLF    |   8779758 |  17878233 |        49.1 |
| 2021-01-29 | AMD    |   8353421 |  22133293 |        37.7 |
| 2021-01-29 | NXTD   |   8295327 |  19064715 |        43.5 |
| 2021-01-29 | SH     |   8287847 |  13130806 |        63.1 |
| 2021-01-29 | TSLA   |   7821075 |  13801262 |        56.7 |
| 2021-01-29 | CCL    |   7785300 |  19885426 |        39.2 |
| 2021-01-29 | DD     |   7471890 |  13022699 |        57.4 |
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  • $\begingroup$ The tables really improve this answer, nicely done. Another way to improve is to enter the bottom table as formatted text instead of a screenshot. That way they can be copied/pasted. Thanks for posting! $\endgroup$ – user1717828 Jan 30 at 14:27
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There are two different data items. "Short volume" (generally available daily) measures the number of shares that have been shorted in the given period of time, while "short interest" (generally available twice a month) is the number of shorted shares that have yet to be closed out or covered by the investors.

The SI function on Bloomberg stands for short interest, but shows the short volume too.

NASDAQ:

Go to https://www.nasdaq.com/. Search for a ticker symbol, for example AAPL. This will take you to Apple's page.

Click on "short interest" on the left. This will take you to https://www.nasdaq.com/market-activity/stocks/aapl/short-interest , which looks like a page designed with the ease of scraping in mind.

Edit: thanks to Kirk Woll for pointing out that instead of scraping, you can go directly to https://api.nasdaq.com/api/quote/AAPL/short-interest?assetClass=stocks and parse that.

Of course you can replace appl by any nasdaq ticker you like in the URL. But NASDAQ only shows this data for NASDAQ-listed stocks, not, for example, NYSE.

FINRA (a U.S. self-regulatory organization) requires its members to report short interest twice a month. You can also see the reported data here: https://otce.finra.org/otce/equityShortInterest

FINRA also has daily short sale volume files (not short interest) here: http://regsho.finra.org/regsho-Index.html

For example, if you wanted to see how many shares of GME were shorted on January 28, 2021,

you'd go to the link , download http://regsho.finra.org/CNMSshvol20210128.txt , and see a pipe-delimited text file containing the entire universe. You find the GME record:

Date|Symbol|ShortVolume|ShortExemptVolume|TotalVolume|Market 20210128|GME|9606123|455032|18899860|B,Q,N

If you wan to compare these volumes with the number of GME shares outstanding, you'll need to find the number of shares outstanding from a recently filed quarterly or annual report. There are many easy ways to find that. For example, you can go to Morningstar (again, you can change the exchange/ticker in the URL for another stock) and click on "short interest", and you will see figures labeled

  • Shares Outstanding

  • Float (the number of shares that are publicly owned, unrestricted and available on the open market)

  • Shares Short

For the ICE / New York Stock Exchange (which includes Arca), according to https://www.nyse.com/market-data/reference/nyse-group-short-interest they want to be paid for their short sale interest data, which is also twice a month.

However NYSE makes short sale volume data available for free via FTP. I think all of their volume data is also on the FINRA page above.

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    $\begingroup$ Forget scraping, just hit the API directly. :) $\endgroup$ – Kirk Woll Jan 29 at 13:59
  • $\begingroup$ How do you find the data for the NYSE? $\endgroup$ – Bob Baerker Jan 29 at 14:30
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    $\begingroup$ Thanks. Just to stress that I'm seeking DAILY updated short data, not data updated biweekly. $\endgroup$ – user52144 Jan 29 at 15:09
  • $\begingroup$ @user52144 Short volume is daily, but short interest is only twice a month. $\endgroup$ – Dimitri Vulis Jan 29 at 15:28
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    $\begingroup$ Phenomenal answer. I made an account just to upvote. Thank you! $\endgroup$ – user1717828 Jan 30 at 14:07

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