Question 1

Does Dimensional Fund Advisors own IOSP stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Dimensional Fund Advisors holds 1,305,038 shares of IOSP (Innospec), worth $106.2M.

Question 2

How many shares of IOSP does Dimensional Fund Advisors own?

Accepted Answer

As of its Q2 2026 13F, Dimensional Fund Advisors holds 1,305,038 shares of IOSP (Innospec).

Question 3

What is Dimensional Fund Advisors' IOSP position worth?

Accepted Answer

As of its Q2 2026 13F, Dimensional Fund Advisors' IOSP position is worth $106.2M.

Question 4

Is Dimensional Fund Advisors buying or selling IOSP?

Accepted Answer

In Q2 2026, Dimensional Fund Advisors increased its IOSP position by 62,949 shares (+5.1%).

Question 5

When did Dimensional Fund Advisors first buy IOSP?

Accepted Answer

Dimensional Fund Advisors already held IOSP in its Q3 2019 13F, the earliest on record, and has listed it in 28 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	1.3M	+5.1%	$106.2M	0.0%	$81.39	32
2026-Q1	Increased	1.2M	+5.7%	$90.7M	0.0%	$72.17	32
2025-Q4	Increased	1.2M	+0.7%	$89.9M	0.0%	$75.65	30
2025-Q3	Decreased	1.2M	-0.2%	$90M	0.0%	$75.34	0
2025-Q2	Increased	1.2M	+0.9%	$98.3M	0.0%	$82.11	30
2025-Q1	Decreased	1.2M	-0.1%	$109.7M	0.0%	$91.65	0
2024-Q4	Decreased	1.2M	-1.6%	$127.5M	0.0%	$106.46	0
2024-Q3	Decreased	1.2M	-0.9%	$133.2M	0.0%	$108.66	0
2024-Q2	Decreased	1.2M	-0.9%	$146.8M	0.0%	$118.75	0
2024-Q1	Decreased	1.2M	-1.4%	$154.6M	0.0%	$123.17	0
2023-Q4	Decreased	1.2M	-0.5%	$149.8M	0.0%	$117.72	0
2023-Q3	Decreased	1.2M	-0.4%	$124.9M	0.0%	$96.98	0
2023-Q2	Increased	1.2M	+0.8%	$123.2M	0.0%	$95.31	30
2023-Q1	Increased	1.2M	+1.6%	$125M	0.0%	$96.74	31
2022-Q4	Increased	1.2M	+0.0%	$123.2M	0.0%	$96.92	30
2022-Q3	Increased	1.2M	+0.5%	$102.6M	0.0%	$80.25	30
2022-Q2	Increased	1.2M	+1.9%	$114.1M	0.0%	$89.73	31
2022-Q1	Increased	1.2M	+1.0%	$108.2M	0.0%	$86.16	30
2021-Q4	Decreased	1.2M	-0.8%	$104.5M	0.0%	$84.10	0
2021-Q3	Decreased	1.2M	-0.8%	$98.2M	0.0%	$77.91	0
2021-Q2	Decreased	1.2M	-1.1%	$106.5M	0.0%	$83.82	0
2021-Q1	Decreased	1.2M	-4.0%	$122M	0.0%	$94.46	0
2020-Q4	Decreased	1.2M	-6.8%	$112.3M	0.0%	$83.46	0
2020-Q3	Decreased	1.3M	-4.3%	$84.1M	0.0%	$57.87	0
2020-Q2	Increased	1.4M	+0.0%	$107.2M	0.0%	$70.60	30
2020-Q1	Decreased	1.4M	-3.6%	$96.4M	0.1%	$63.00	0
2019-Q4	Decreased	1.4M	-1.0%	$148.9M	0.1%	$93.78	0
2019-Q3	First report	1.5M	-	$129.6M	0.1%	$80.37	0

IOSP28 quarters

IOSP
28 quarters