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https://finance.yahoo.com/quote/BF-A/history?period1=1517875200&period2=1518134400&interval=1d&filter=history&frequency=1d&includeAdjustedClose=true

Yahoo Finance says BF-A has a 1339:1000 split event on Feb 07, 2018. However, the split-adjusted stock has a jump from Feb 06, 2018 to Feb 07, 2018. This doesn't seem to be right, as one should not expect such a big jump even after the adjustment for the split event.

On EDGAR, I don't see any relevant document describing this split event.

https://www.sec.gov/edgar/search/#/dateRange=custom&ciks=0000014693&entityName=BROWN%2520FORMAN%2520CORP%2520(BF-B%252C%2520BF-A)%2520(CIK%25200000014693)&startdt=2017-01-01&enddt=2017-03-01

Can I conclude that this split event did not exist?

splithistory.com also shows the same split event.

https://www.splithistory.com/?symbol=BF.A

If both websites have the same error, the error must be from a common source. Does anybody know where the error came from?

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    $\begingroup$ Maybe instead of free data sources on the Internet (Yahoo Finance is rather infamous for data quality problems), you should invest in access to something like CRSP? $\endgroup$ Commented Mar 25, 2022 at 11:24
  • $\begingroup$ Splits do not necessarily require an EDGAR filing $\endgroup$
    – amdopt
    Commented Mar 25, 2022 at 17:22
  • $\begingroup$ But then how to verify there was indeed a split? $\endgroup$ Commented Mar 25, 2022 at 17:35

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The source of the error in Yahoo Finance is CSI Data, who provide the data to Yahoo. This error is present in their product, Unfair Advantage.

This issue is present in that they have accounted for this company restructure twice - once around the record date event, and once on the actual ex date.

The reason for this is that this type of distribution is out-of-the-ordinary and they appear to lack quality control in this area.

The impact of these sorts of errors are massive in quant trading - Garbage In, Garbage Out!

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  • $\begingroup$ Thanks, do you say that this distribution is out of the ordinary because it's a stock dividend (rather than a split) or is there something more unusual that I don't notice in this example? Stock dividends are less common than plan old stock splits, but still happen a lot. $\endgroup$ Commented Mar 27, 2022 at 23:52
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What problem(s) are you trying to solve here? If you're trying to convince yourself that free data on the Internet is not fully trustworthy, then you have already succeded hundredfold. If you're trying to verify the details of Brown-Forman's 2018 split (more precisely, stock dividend), then start with their fy 2018 10K, fortunately recent enough to be free on Edgar:

https://www.sec.gov/Archives/edgar/data/14693/000001469318000084/bfb-2018430x10kapril.htm

Note 10 Common Stock

On May 26, 2016, our Board of Directors approved a two-for-one stock split for our Class A and Class B common stock, subject to stockholder approval of an amendment to our Restated Certificate of Incorporation.

The stock split, which was effected as a stock dividend, resulted in the issuance of one new share of Class A common stock for each share of Class A common stock outstanding and one new share of Class B common stock for each share of Class B common stock outstanding. The new shares were distributed on August 18, 2016, to shareholders of record as of August 8, 2016.

On January 23, 2018, our Board of Directors approved a stock split, effected in the form of a stock dividend. For every four shares of either Class A or Class B common stock held, shareholders of record as of the close of business on February 7, 2018, received one share of Class B common stock, with any fractional shares payable in cash. The additional shares and cash for fractional shares were distributed to stockholders on February 28, 2018.

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