| Extreme Sailing Series | |
| Organizer: | OC Sport |
| Classes: | Extreme 40 (2007–2015) GC32 (2016–2018) |
| Champions: | Alinghi (2018) |
| Most Champs: | Alinghi (4) The Wave, Muscat (4) |
The Extreme Sailing Series (ESS) (formerly the iShares Cup) was an annual global racing series, organised by OC Sport, which ran from 2007 to 2018.
The series started in 2007 with its main attraction being the stadium racing which puts the race course inside a stadium environment for the ease of spectators' viewing.[1]
Many of the sailors taking part in the series were around-the-world yachtsmen, Olympic medallists, America's Cup sailors, World and European champions and even world record holders.[2] [3]
The series was terminated in 2019 after the event became financially nonviable and OC Sport were unable to secure a management buy-out.[4] [5]
| Year[6] | Venues | Entries | Winning team | Winning skipper | |
|---|---|---|---|---|---|
| 2007 | 6 | 9 |  Basilica | Rob Greenhalgh | |
| 2008 | 5 | 9 |  Alinghi |  Ed Baird | |
| 2009 | 6 | 9 |  Oman Sail Masirah | Pete Cumming | |
| 2010 | 5 | 8 | The Wave, Muscat | Paul Campbell-James | |
| 2011 | 9 | 11 |  Luna Rossa | Max Sirena | |
| 7 | 8 | The Wave, Muscat | Leigh McMillan | ||
| 8 | 8 | The Wave, Muscat | Leigh McMillan | ||
| 8 | 11 | Alinghi | Morgan Larson | ||
| 8 | 8 | The Wave, Muscat | Leigh McMillan | ||
| 7 | 8 | Alinghi | Arnaud Psarofaghis | ||
| 2017 | 8 | 6 | SAP Extreme Sailing Team | Jes Gram-Hansen & Rasmus Køstner | |
| 2018 | 8 | 6 | Alinghi | Arnaud Psarofaghis |
Based on results from 2007 to 2018, Pete Greenhalgh (GBR) is the most successful sailor from the series, consistently finishing on the podium, including 1st place in 2007 on Basilica, alongside his younger brother, Robert Greenhalgh.