According to Official Guinness Records,
The largest cheerleading dance is by 1,371 people, achieved by Wing Dance Promotion Co., Ltd. (Japan) at Maihama Amphitheater, in Urayasu, Chiba, Japan, on 30 August 2015. The attempt was held during an event to celebrate Wing Dance Promotion's 20th anniversary.
For a complete list of 2015 records, please visit 2015 Guinness Records in Japan.