Dimensional Fund discloses 5.3% Innospec stake (IOSP)

Rhea-AI Filing Summary

Dimensional Fund Advisors LP reports beneficial ownership of 1,305,038 shares of Innospec Inc. common stock, representing 5.3% of the class as of June 30, 2026. It reports sole voting power over 1,279,717 shares and sole dispositive power over 1,305,038 shares, with no shared voting or dispositive power.

The shares are held by investment companies and other funds for which Dimensional or its subsidiaries act as adviser or manager. Dimensional may be deemed a beneficial owner due to its voting and investment authority but disclaims beneficial ownership, and no individual fund’s interest exceeds 5% of Innospec’s common stock.

Key Figures

Beneficially owned shares: 1,305,038 shares Percent of class: 5.3% Sole voting power: 1,279,717 shares +3 more

6 metrics

Beneficially owned shares 1,305,038 shares Innospec Inc. common stock reported by Dimensional Fund Advisors LP

Percent of class 5.3% Reported percentage of Innospec Inc. common stock class

Sole voting power 1,279,717 shares Innospec shares for which Dimensional has sole power to vote or direct the vote

Sole dispositive power 1,305,038 shares Innospec shares for which Dimensional has sole power to dispose or direct disposition

Shared voting power 0 shares Innospec shares with shared voting power reported by Dimensional

Signature date 07/14/2026 Date signed by Dimensional’s Global Chief Compliance Officer

Key Terms

beneficial owner, sole power to vote or to direct the vote, dispositive power, Investment Advisors Act of 1940, +1 more

5 terms

beneficial owner financial

"may be deemed to be the beneficial owner of the shares of the Issuer"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole power to vote or to direct the vote financial

"Number of shares as to which the person has sole power to vote"

dispositive power financial

"sole power to dispose or to direct the disposition of"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Investment Advisors Act of 1940 regulatory

"an investment adviser registered under Section 203 of the Investment Advisors Act of 1940"

Section 13(d) of the Securities Exchange Act of 1934 regulatory

"for any other purposes than Section 13(d) of the Securities Exchange Act of 1934"

Section 13(d) of the Securities Exchange Act of 1934 is a U.S. rule that requires anyone who buys more than 5% of a public company’s shares to publicly disclose who they are, how many shares they own, and their intentions toward the company. For investors, this is like a neighborhood alert when someone acquires a large stake in a building: it reveals potential changes in control or strategy that could affect the stock’s price, governance, or future direction.

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Available on EDGAR 07/14/2026 - 01:28 PM Accepted by SEC EDGAR 07/14/2026 - 01:27 PM Learn about SEC filing dates

FAQ

What percentage of Innospec (IOSP) does Dimensional Fund Advisors report owning?

Dimensional Fund Advisors LP reports beneficial ownership of 5.3% of Innospec Inc. common stock. This percentage reflects 1,305,038 shares over which it has voting and/or investment power through funds it advises, as of June 30, 2026.

How many Innospec (IOSP) shares are reported by Dimensional Fund Advisors?

Dimensional Fund Advisors LP reports beneficial ownership of 1,305,038 Innospec Inc. common shares. It has sole voting power over 1,279,717 of those shares and sole dispositive power over all 1,305,038 shares, with no shared voting or dispositive authority.

Who actually owns the Innospec (IOSP) shares tied to Dimensional Fund Advisors?

The 1,305,038 Innospec shares are owned by various investment companies and other funds advised or managed by Dimensional and its subsidiaries. Dimensional may be deemed a beneficial owner due to voting and investment authority but expressly disclaims beneficial ownership of these securities.

Does any single Dimensional-managed fund hold over 5% of Innospec (IOSP)?

According to Dimensional, the interest of any one fund in Innospec Inc. does not exceed 5% of the common stock. The reported 5.3% stake represents the aggregate position across multiple funds and accounts for which Dimensional acts as adviser or manager.

What voting and dispositive powers does Dimensional have over Innospec (IOSP) shares?

Dimensional reports sole voting power over 1,279,717 Innospec shares and sole dispositive power over 1,305,038 shares. It reports no shared voting or dispositive power, meaning decisions are controlled solely through Dimensional’s advisory authority on behalf of its client funds.

What is Dimensional Fund Advisors’ legal status in this Innospec (IOSP) holding?

Dimensional Fund Advisors LP, a Delaware limited partnership and registered investment adviser, may be deemed a beneficial owner of Innospec shares under Section 13(d). However, it disclaims beneficial ownership, emphasizing that all securities are owned by its client funds.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Innospec Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

45768S105

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 45768S105

1

Names of Reporting Persons

Dimensional Fund Advisors LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,279,717.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,305,038.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,305,038.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Innospec Inc
(b)	Address of issuer's principal executive offices: 8310 South Valley Highway, Suite 350, Englewood, CO 80112
Item 2.
(a)	Name of person filing: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 45768S105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,305,038 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 5.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,279,717** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,305,038** see Note 1 **
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	07/14/2026