PROSPERITY BANCSHARES INC

Ticker: PB CUSIP: 743606105 Class: Common Stock

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

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

Q3 2017
Shares 357,743 Value ($000) $23,514 Avg Close $48.81 Range $43.48 - $51.97
Q2 2017
Shares 358,449 Value ($000) $23,027 Avg Close $51.10 Range $47.48 - $55.76
Q1 2017
Shares 360,685 Value ($000) $25,143 Avg Close $56.04 Range $50.62 - $60.04
Q4 2016
Shares 362,149 Value ($000) $25,995 Avg Close $48.03 Range $40.52 - $56.81
Q3 2016
Shares 364,193 Value ($000) $19,991 Avg Close $40.49 Range $35.05 - $42.93
Q2 2016
Shares 371,234 Value ($000) $18,929 Avg Close $38.21 Range $32.83 - $41.39
Q1 2016
Shares 378,529 Value ($000) $17,560 Avg Close $31.88 Range $25.29 - $36.03
Q4 2015
Shares 306,114 Value ($000) $14,651 Avg Close $38.52 Range $34.73 - $42.71