Q. Ownership / holders - Institutional and insider ?

• WRDS. 1. Choose Thomson Reuters then Institutional 13 f Holdings for USA and Canadian Holdings.  Choose Institutional Holdings (type 2) under the Ownership category for other parts of the world. 2. Thomson Ownership has institutional shareholders for many non-US markets.

• Bloomberg in Firestone (A Floor)
  • Examples:
    • IBM [EQUITY] hds [GO] 
    • For statistics:
      • IBM [EQUITY] des4 [GO]
    • Search companies alphabetically or by size of holdings:
      • IBM [EQUITY] phdcs [GO]
• Capital IQ has institutional ownership information, but is difficult to use to build large datasets. Available on Firestone A Floor.
• OSIRIS for companies outside the USA and Canada.

Due to regulations. company insiders and institutions holding shares need to report holdings and in the case of insiders transactions.  This data can be found in several ways. 

Bloomberg

• for insider holdings - Ticker <equity> PHDC<go> select Insider only. For bonds use Bond ID<corp> PDHC <go> or use HDC the P adds percent 
• for monitor on insider buying or selling use INSD <go> 
• for institutional holdings  - Ticker <equity> PHDC<go> select Institutional only.  For bonds use Bond ID<corp> PDHC <go> or use HDC the P adds percent 

Thomson Reuters through WRDS 

• Insiders can sell or buy using two different methods - A 144 transaction is a one time buy or sell.  A 10b5 transaction is one that is recurring.  
• Institutional holdings are reported on form 13f.  Use this options when looking for institutional holdings in the US or Canada.
• There are also international Institutional Holdings (type 2) under the Ownership category for other parts of the world or the Ownership option has institutional shareholders for many non-US markets.