I'm working on scraping SEC filings. I came across something odd and wanted to check if anyone here has ever encountered similar issues. In order to access the filings, I first created a script to map each ticker to a Central Index Keys (CIK) and subsequently generate start_urls for my Scrapy program using these CIK, such as;

https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000720672&type=10-K&dateb=&owner=exclude&count=40

Whilst checking the urls, I came across a number of duplicates. Most of these duplicates are where a ticker symbol has been recycled from a defunct company. However, I also came across a number of duplicate urls with asymmetric symbols. These are summarised in odd_ticker_cik.

odd_ticker_cik = {  
    "0000720672" : ['SF', 'SFN'],  
    "0000077551" : ['ABI', 'CRA'],  
    "0001386926" : ['KFI', 'KFN'],  
    "0000923571" : ['USX', 'XPRSA'],  
    "0000822416" : ['PHA', 'PHM'],  
    "0000350797" : ['ETW', 'EV'],  
    "0001617640" : ['Z', 'ZG']  
}

If these tickers are searched for on the SEC Company Search Page, they retrieve identical Company filing pages referencing the same CIK. However, as can be seen in odd_ticker_cik, the tickers refer to different companies.

odd_company_cik = {  
    "0000720672" : ['STIFEL FINANCIAL CORP', 'SFN GROUP INC'],  
    "0000077551" : ['APPLERA CORP - APPLIED BIOSYST', 'CELERA CORP'],  
    "0001386926" : ['K&F INDUSTRIES HOLDINGS  INC. COM STK', 'KKR FINANCIAL HOLDINGS LLC'],  
    "0000923571" : ['U.S. XPRESS ENTERPRISES INC', 'U S XPRESS ENTERPRISES INC CLA'],  
    "0000822416" : ['PHARMACIA CORPORATION', 'PULTE GROUP INC'],  
    "0000350797" : ['EATON VANCE TAX-MANAGED GLOBAL BUY-WRITE OPPORTUNITIES FD',  
                                      'EATON VANCE CORP NON-VTG'],  
    "0001617640" : ['ZILLOW GROUP INC CL C ', 'ZILLOW GROUP INC CLASS A']  
}

When searching these individually, the following tickers seem to be yielding incorrect results ['SFN', 'CRA', 'KFI', 'XPRSA', 'PHA', 'ETW' ]. If I search for the company names on the SEC, the correct companies are found with their corresponding CIK (i.e. different to those given in odd_company_cik), but the tickers aren't working.

I wanted to check here first if the tickers for these companies are correct? Thanks in advance