What was changed
Elliott accumulated roughly 8% economic exposure in Mentor Graphics in September 2016. By mid-November, Mentor—which had reportedly been considering strategic options—announced an agreement for Siemens to buy it at $37.25 per share, a 21% premium to the prior Friday close, valuing the EDA software maker near $4.5 billion.
The merger fit Siemens' 'Vision 2020' push into industrial software and Industry 4.0; Mentor's roughly $1.2 billion-revenue business would join Siemens' product lifecycle management unit, with the deal expected to close in the second quarter of 2017.
Elliott's November 14, 2016 amended 13D records the mechanism: a Support Agreement with Mentor and Siemens under which Elliott agreed to vote its shares for the merger, with an irrevocable proxy if it failed to do so, and restrictions on transferring shares before the vote.
What it achieved
Siemens acquired Mentor at $37.25 per share (about $4.5B), a 21% premium; Elliott's 13D/A shows it signed a support agreement to vote for the merger.
Why it worked
The disclosed stake signaled the board could not wait out the discount.
Elliott's support agreement removed the biggest proxy risk for Siemens.
A premium cash bid answered the 'what's it worth' question fast.
What can be applied
A 13D that questions the standalone path shortens the runway to a sale; a written support agreement converts the activist from threat into the deal's biggest backer.
Aftermath
The acquisition closed in April 2017, making Mentor part of Siemens' digital industry software portfolio and giving shareholders a 21% premium; Elliott exited with a clear win in weeks rather than years.
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