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Oil Search Limited (OSH) / Santos Limited (STO) merger - December 2021

Oil Search (OSH) merged with Santos (STO) and shareholders of OSH were issued shares in STO. Eligible OSH shareholders will receive 0.6275 shares in STO for each OSH share.

These instructions depend on the provision of capital gains tax rollover relief / Class Ruling from the Australian Taxation Office.

Each OSH security was exchanged for 0.6275 STO security on the effective date of 14 December 2021.

To account for the merger in Stock Doctor, please perform the following steps:  

  1. Under 'Portfolio Director', click on the portfolio containing OSH.
  2. Under 'Securities Held', click on OSH. This will take you to the OSH securities screen.

Under 'Trades and Adjustments', click on the down arrow next to ‘Other Transactions’ and choose ‘New Reconstruction’.


  1. In the new dialogue window that opens, enter the following information in the ‘New Holding for which rollover relief applies area’:
  • Date: 14/12/2021
  • Code: STO
  • Quantity: Enter the quantity per your statement (which will be the number of shares in OSH multiplied by 0.6275.

** In this example, we have considered 10,000 shares of OSH for which the quantity of STO shares is 6275, but this should be modified to reflect your holding.

  • Cost base rolled over (%): 100.
  • Now click ‘Save’. 


You have now accounted for the merger of OSH to STO