Boston Partners reports 7.5% stake in American Integrity

American Integrity Insurance Group, Inc. ownership disclosure: Boston Partners filed an amendment reporting beneficial ownership of 1,468,404 shares of Common Stock, representing 7.5% of the class as of 03/31/2026.

Rhea-AI Filing Summary

American Integrity Insurance Group, Inc. ownership disclosure: Boston Partners filed an amendment reporting beneficial ownership of 1,468,404 shares of Common Stock, representing 7.5% of the class as of 03/31/2026. The Schedule 13G/A states these shares are held in discretionary client accounts and notes Rule 13d-3 may deem Boston Partners a beneficial owner.

Insights

Institutional Ownership Analyst

Boston Partners reports a 7.5% passive stake in AII as of 03/31/2026.

Boston Partners discloses 1,468,404 shares held in discretionary client accounts, which the filing treats under Rule 13d-3 as potentially attributable to the firm. The filing is a standard beneficial ownership update rather than a transaction notice.

Cash-flow treatment and any intended sales are not stated; subsequent filings would show activity if holders sell or acquire shares.

Key Figures

Shares beneficially owned: 1,468,404 shares Percent of class: 7.5% Filing signature date: 05/14/2026

3 metrics

Shares beneficially owned 1,468,404 shares as of 03/31/2026

Percent of class 7.5% percent of Common Stock as reported

Filing signature date 05/14/2026 Schedule 13G/A amendment signed by Ali Farooqi

Key Terms

Schedule 13G/A, beneficial owner, Rule 13d-3

3 terms

Schedule 13G/A regulatory

"This Schedule is being filed with respect to 1,468,404 shares"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial owner regulatory

"By reason of rule 13d-3 under the act Boston Partners may be deemed to be a beneficial owner"

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.

Rule 13d-3 regulatory

"By reason of rule 13d-3 under the act Boston Partners may be deemed"

Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Boston Partners report in American Integrity (AII)?

Boston Partners reports beneficial ownership of 1,468,404 shares, equal to 7.5% of the Common Stock as of 03/31/2026. The shares are held in discretionary client accounts and reported on a Schedule 13G/A filed as an amendment.

Does the Schedule 13G/A say Boston Partners will sell AII shares?

No. The amendment states the shares are held for discretionary client accounts and does not disclose any planned sales or purchases. The filing does not specify cash-flow treatment or intent; any trading activity would appear in later filings if executed.

Why does the filing mention Rule 13d-3 for Boston Partners?

The filing notes that, by reason of Rule 13d-3, Boston Partners may be deemed a beneficial owner of the reported shares because it has voting and dispositive power over them for client accounts.

What is the reporting date and signature date on the amendment?

The ownership position is stated as of 03/31/2026, and the Schedule 13G/A amendment was signed by Ali Farooqi, Senior Compliance Manager, on 05/14/2026.

How is the 7.5% ownership calculated in the filing?

The filing lists 1,468,404 shares as beneficially owned and separately states the percent of class as 7.5%. The Schedule 13G/A presents those two figures together as the reported ownership metric.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 09:56 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

American Integrity Insurance Group, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

026948109

(CUSIP Number)

03/31/2026

(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): 026948109

1

Names of Reporting Persons

Boston Partners

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,468,404.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,468,404.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,468,404.00

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)

7.5 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: American Integrity Insurance Group, Inc.
(b)	Address of issuer's principal executive offices: 3000 BAYPORT DRIVE, SUITE 500, TAMPA, FLORIDA 33607
Item 2.
(a)	Name of person filing: Boston Partners
(b)	Address or principal business office or, if none, residence: ONE BEACON STREET 30TH FLOOR BOSTON, Massachusetts 02108
(c)	Citizenship: Boston Partners - DELAWARE
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 026948109
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: 1,468,404
(b)	Percent of class: 7.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Boston Partners - 1,468,404
	(ii) Shared power to vote or to direct the vote: Boston Partners - 0
	(iii) Sole power to dispose or to direct the disposition of: Boston Partners - 1,468,404
	(iv) Shared power to dispose or to direct the disposition of: Boston Partners - 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. This Schedule is being filed with respect to 1,468,404 shares of American Integrity Insurance Group (the Common Stock) held by Boston Partners on 03/31/2026 for the discretionary account of certain clients. By reason of rule 13d-3 under the act Boston Partners may be deemed to be a beneficial owner of such Common Stock. To the knowledge of Boston Partners no person has the right to receive or the power to direct the receipt of dividends from or the proceeds from the sale of such Common Stock which represents more than 5% of the outstanding shares of the Common Stock referred to in item 4(b) hereof.
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.

Boston Partners

Signature:	/s/Ali Farooqi
Name/Title:	Ali Farooqi / Senior Compliance Manager
Date:	05/14/2026