Share Conversion


Due to certain historical regulatory policies applicable to U.K. companies, Ensco plc’s shares had been listed on the NYSE as American Depositary Shares (“ADSs”) since the company's redomestication to the U.K. in December 2009.

As a result of recent changes in applicable regulatory policies, the Company’s Board of Directors decided to terminate the ADS facility to allow for Ensco’s Class A Ordinary Shares (“Shares”) to trade directly on the NYSE (The “Conversion”). Ensco's Class A Ordinary Shares began trading on the NYSE on 22 May 2012 under the same symbol “ESV.”

Why is this Conversion important?

Ensco previously was included in the S&P 500 Index until December 2009 when it changed its corporate domicile to the U.K. and began trading in ADS form on the NYSE. Subsequently, Ensco was removed from the index due to eligibility rules that exclude companies listed in ADS form.  By converting to a Share listing, Ensco’s eligibility for the S&P 500 Index will be restored, although there is no assurance that Ensco will be added to the S&P 500 Index in the future.  

The majority of Ensco shareholders will be unaffected by the conversion from ADSs to Class A Ordinary Shares.

  • Shareholders who hold their ADSs in a bank or brokerage account will not be required to take any action.
  • Shareholders possessing physical certificates or who hold their ADSs in an account with the Company’s transfer agent (holders of record) will receive instructions by mail on how to convert their ADSs.

 Exchange Agent:

Please call Computershare Customer Service with questions at 888.926.3470 from within the United States, or 732.491.0636 from outside the United States. Representatives are available from 8:30 a.m. to 6:00 p.m. ET, Monday through Friday.

If sending correspondence: 

Mail to:

P. O. Box 43001
Providence, RI 02940-3001

By overnight mail:

250 Royall Street
Canton, MA 02021

Other Information

Fleet Status Report

Thumb Download

Investor Relations Contacts

Sean P. O'Neill
Vice President–Investor Relations and Communications

Nick Georgas
Sr. Manager–Investor Relations

Email Investor Relations