- Penguin 1 on April 24, 2012 (impacting around 3.1% of queries)
- Penguin 2 on May 26, 2012 (impacting less than 0.1%)
- Penguin 3 on October 5, 2012 (impacting around 0.3% of queries)
- Penguin 4 (also known as Penguin 2.0) on May 22, 2013 (impacting 2.3% of queries)
- Penguin 5 (also known as Penguin 2.1) on October 4, 2013 (impacting around 1% of queries)
- Penguin 6 (also known as Penguin 3.0) on October 17, 2014 (impacting less than 1% English queries)
- Penguin 7 (also known as Penguin 4.0) on September 23, 2016