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$IOSP
$101.41 +$0.71 (0.71%) Close

Ownership

13F as of Q2 2026 · 24.6M shares outstanding

Who owns IOSP?

By type of holder
Institutions 99.8% Insiders 0.2% Everyone else 0.0%
Concentration Top 10 holders own 58.1%
BlackRock, Inc. 17.8% · Allspring Global Investments Holdings, LLC 7.7%
Institutional ownership
99.8%
-0.2 pts vs last qtr
Institutional holders
280
+13 vs last qtr
Net shares bought
−350.9K
by institutions in Q2 2026
New / sold out
45 / 32
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • BlackRock, Inc. +502.3K
  • Aqr Capital Management LLC +170.5K

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Biggest sellers in Q2 2026
  • Allspring Global Investments Holdings, LLC −423.5K
  • UBS Group AG −411.9K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Innospec Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025
+2.3%
+0.25% a year
Each share's claim on the business
−2.2%
shrank without buying or selling a share
Spent on buybacks vs paid in stock
$47.8M vs $60.4M
over 10 fiscal years
Diluted shares, split-adjusted
23.7M24.5M25.4M2016: 24.4M shares'162017: 24.5M shares'172018: 24.6M shares'182019: 24.7M shares'192020: 24.8M shares'202021: 24.9M shares'212022: 25.0M shares'222023: 25.0M shares'232024: 25.1M shares'242025: 25.0M shares'25
Buybacks Stock-based comp
$0$12.0M$23.9M2016 buybacks: $8.4M2016 stock comp: $3.3M'162017 buybacks: $1.1M2017 stock comp: $4.1M'172018 buybacks: $1.4M2018 stock comp: $4.9M'182019 buybacks: $2.4M2019 stock comp: $6.6M'192020 buybacks: $2.1M2020 stock comp: $5.8M'202021 buybacks: $800.0K2021 stock comp: $4.4M'212022 buybacks: $5.9M2022 stock comp: $6.7M'222023 buybacks: $1.1M2023 stock comp: $8.0M'232024 buybacks: $700.0K2024 stock comp: $8.5M'242025 buybacks: $23.9M2025 stock comp: $8.1M'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years69% 3–5 years13% 1–3 years12% Under 1 year5%
Quarterly turnover
11.2%
of institutional shares changed hands
Top 10 managers, median time held
5 years

Super Investors

Investment managers reporting IOSP on Form 13F
B
BlackRock, Inc.
Shares
4.4M
% of company
17.79%
Change vs last qtr
+502.3K (+13.0%)
Held since
≤2021
AG
Allspring Global Investments Holdings, LLC
Shares
1.9M
% of company
7.68%
Change vs last qtr
−423.5K (−18.3%)
Held since
2021

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Institutional Funds

Mutual funds and ETFs reporting IOSP on Form N-PORT; together they hold 54.4% of the company
IC
iShares Core S&P Small-Cap ETF
iShares Trust
Position value
$121M
% of company
6.03%
% of the fund
0.11%
As of
June 30, 2026
AS
Allspring Special Small Cap Value Fund
Allspring Funds Trust
Position value
$98.3M
% of company
4.90%
% of the fund
3.32%
As of
June 30, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
WP
Williams Patrick
Insider
Shares
231.5K
% of company
0.94%
Change vs last qtr
—
Held since
—
BM
Blackmore Milton C
Insider
Shares
23.1K
% of company
0.09%
Change vs last qtr
—
Held since
—

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