"While most of the major shareholders are known to have accepted...

"While most of the major shareholders are known to have accepted Mitsui's offer, Seven Group Holdings is still holding off as it seeks options to take operating control of AWE's key gas field Waitsia. "
I expect Beach Energy is a key part of those options for SGH.

Seven Group Holdings Limited (SGH) is a leading Australian diversified operating and investment group with market leading businesses and investments in industrial services, oil and gas, and media. In industrial services, WesTrac Group is the sole authorised Caterpillar dealer in Western Australia, New South Wales and the Australian Capital Territory in Australia. SGH Energy is developing an expanding presence in oil and gas projects in Australia and the United States.
SGH also owns AllightSykes, a supplier of lighting towers, generators and pumps, and Coates Hire, Australia’s largest equipment hire business. In media, SGH has a 41% shareholding in Seven West Media, Australia’s largest multiple platform media company, including the Seven Network, West Australian Newspapers, Pacific Magazines and Yahoo!7.

http://www.sevengroup.com.au/about-us/board-of-directors

Board of Directors

• Kerry Matthew Stokes AC
  
  Executive Chairman of Seven Group Holdings Limited since April 2010.
  
  Executive Chairman of Seven Network Limited since July 1999. Prior to that Non Executive Chairman since June 1995.
  
  Appointed a Companion in the General Division of the Order of Australia in the Queen’s Birthday honours announced on 9 June 2008.
  
  Chairman of Seven Media Group Pty Limited since December 2006.
  
  Chairman of Australian Capital Equity Pty Limited Group which has significant interests in activities which include media and entertainment, resources, energy, property and industrial activities.
  
  Chairman of Seven West Media Limited (formerly West Australian Newspapers Holdings Limited) since 11 December 2008. Appointed a Director on 25 September 2008.
  
  Chair of the Australian War Memorial Council.
• Ryan Kerry Stokes
  
  Mr Ryan Stokes was appointed Managing Director & Chief Executive Officer of Seven Group Holdings Limited (SGH) with effect from 1 July 2015.
  
  He was previously Chief Operating Officer of SGH from 28 August 2012 until 1 July 2015 and an Executive Director of the Company since February 2010.
  
  Mr Stokes is a Director of Seven West Media Limited (SWM) which owns the Seven Network, The West Australian Newspaper, Pacific Magazines and 50% of Yahoo7. Mr Stokes has been a Director of SWM since 2012 and was an Executive Director and then Chairman of Pacific Magazines from 2004 to 2008 and a Director of Yahoo7 from 2005 to 2013.
  
  As a Director of WesTrac Pty Limited, Mr Stokes has extensive experience in China, having developed relationships with various mining and media companies over the past fifteen years. He led the restructuring of the Group’s China operations, returning the business to profitability. He is also a Director of Coates Hire Pty Limited.
  
  Mr Stokes was appointed Non-Executive Director of Beach Energy Limited in July 2016. Mr Stokes is a Non-Executive Director of Coates Hire.
  Mr Stokes is Chief Executive Officer of Australian Capital Equity Pty Limited (ACE), being appointed an Executive Director in 2001 and CEO in April 2010. ACE is a private company with its primary investment being an interest in SGH.
  
  Mr Stokes was a Director of Iron Ore Holdings Limited from 1 November 2011 to 7 October 2014. Between 10 September 2009 and 19 November 2012, Mr Stokes was a Director of Consolidated Media Holdings Limited.