INNOSPEC INC

Ticker: IOSP CUSIP: 45768S105 Class: Common Stock

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q4 2025

Shares 6,238 Value ($000) $477 Avg Close $75.03 Range $70.10 - $79.81

Q4 2022

Shares 2,819 Value ($000) $0 Avg Close $96.50 Range $78.79 - $110.27

Q1 2021

Shares 26,305 Value ($000) $2,701 Avg Close $92.10 Range $80.91 - $99.72

Q4 2020

Shares 62,184 Value ($000) $5,642 Avg Close $71.95 Range $57.19 - $85.43

Q3 2020

Shares 155,180 Value ($000) $9,826 Avg Close $68.67 Range $56.85 - $78.17

Q2 2020

Shares 94,132 Value ($000) $7,272 Avg Close $67.35 Range $57.02 - $79.77

Q1 2020

Shares 51,340 Value ($000) $3,568 Avg Close $83.79 Range $52.02 - $98.93

Q4 2019

Shares 133,185 Value ($000) $13,777 Avg Close $87.47 Range $77.84 - $97.70

Q3 2019

Shares 28,626 Value ($000) $2,552 Avg Close $81.78 Range $74.31 - $88.66

Q1 2019

Shares 5,653 Value ($000) $471 Avg Close $67.58 Range $51.63 - $78.46

Q1 2017

Shares 86,372 Value ($000) $5,593 Avg Close $59.26 Range $51.41 - $66.19

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	6,238	$477	$75.03	$70.10 - $79.81
Q4 2022	2,819	$0	$96.50	$78.79 - $110.27
Q1 2021	26,305	$2,701	$92.10	$80.91 - $99.72
Q4 2020	62,184	$5,642	$71.95	$57.19 - $85.43
Q3 2020	155,180	$9,826	$68.67	$56.85 - $78.17
Q2 2020	94,132	$7,272	$67.35	$57.02 - $79.77
Q1 2020	51,340	$3,568	$83.79	$52.02 - $98.93
Q4 2019	133,185	$13,777	$87.47	$77.84 - $97.70
Q3 2019	28,626	$2,552	$81.78	$74.31 - $88.66
Q1 2019	5,653	$471	$67.58	$51.63 - $78.46
Q1 2017	86,372	$5,593	$59.26	$51.41 - $66.19