SIX FLAGS ENTMT CORP NEW

CUSIP: 83001A102 Class: Common Stock

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

Note: Option positions (PUT/CALL) are excluded.

Q4 2018
Shares 2,714,561 Value ($000) $151,011 Avg Close — Range —
Q3 2018
Shares 4,949,544 Value ($000) $345,578 Avg Close — Range —
Q2 2018
Shares 4,784,387 Value ($000) $335,146 Avg Close — Range —
Q1 2018
Shares 4,580,227 Value ($000) $285,165 Avg Close — Range —
Q4 2017
Shares 4,515,844 Value ($000) $300,620 Avg Close — Range —
Q3 2017
Shares 5,411,196 Value ($000) $329,758 Avg Close — Range —
Q2 2017
Shares 5,108,828 Value ($000) $304,537 Avg Close — Range —
Q1 2017
Shares 5,271,644 Value ($000) $313,610 Avg Close — Range —
Q4 2016
Shares 4,818,670 Value ($000) $288,927 Avg Close — Range —
Q3 2016
Shares 4,413,596 Value ($000) $236,613 Avg Close — Range —
Q2 2016
Shares 4,174,239 Value ($000) $241,897 Avg Close — Range —
Q1 2016
Shares 4,186,969 Value ($000) $232,335 Avg Close — Range —
Q4 2015
Shares 4,104,723 Value ($000) $225,513 Avg Close — Range —
Q3 2015
Shares 3,645,610 Value ($000) $166,896 Avg Close — Range —