William Blair holds 5.3% of i3 Verticals (NASDAQ: IIIV) via Schedule 13G

Rhea-AI Filing Summary

i3 Verticals, Inc. reported that William Blair Investment Management, LLC beneficially owns 1,176,960 shares of common stock, representing 5.3% of the class. The filer discloses sole dispositive power over 1,176,960 shares and sole voting power over 892,475 shares. The filing is a Schedule 13G and is signed by the Chief Compliance Officer.

Key Figures

Beneficial ownership: 1,176,960 shares Percent of class: 5.3% Sole voting power: 892,475 shares +3 more

6 metrics

Beneficial ownership 1,176,960 shares Amount beneficially owned as reported on Schedule 13G

Percent of class 5.3% Percent of common stock beneficially owned

Sole voting power 892,475 shares Shares with sole power to vote or direct the vote

Sole dispositive power 1,176,960 shares Shares with sole power to dispose or direct disposition

Reporting period 03/31/2026 Date shown on the Schedule 13G cover

Signature date 05/07/2026 Date the filing was signed by Chief Compliance Officer

Key Terms

Schedule 13G, beneficially owned, sole dispositive power

3 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: i3 Verticals, Inc."

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Item 4. (a) Amount beneficially owned: 1,176,960"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Item 4. (c)(iii) Sole power to dispose or to direct the disposition of: 1,176,960"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

i3 Verticals, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

46571Y107

(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): 46571Y107

1

Names of Reporting Persons

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

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 892,475.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,176,960.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,176,960.00

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: i3 Verticals, Inc.
(b)	Address of issuer's principal executive offices: 40 BURTON HILLS BLVD., SUITE 415, NASHVILLE, TENNESSEE, 37215
Item 2.
(a)	Name of person filing: William Blair Investment Management, LLC
(b)	Address or principal business office or, if none, residence: 150 North Riverside Plaza, Chicago, IL 60606
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 46571Y107
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: 1,176,960
(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: 892,475
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,176,960
	(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.
	Not Applicable
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.

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Signature:	Telmo Martins
Name/Title:	Chief Compliance Officer
Date:	05/07/2026

FAQ

What stake does William Blair report in i3 Verticals (IIIV)?

William Blair reports beneficial ownership of 1,176,960 shares, equal to 5.3% of i3 Verticals common stock. The Schedule 13G lists sole dispositive power for 1,176,960 shares and sole voting power for 892,475 shares.

When was the Schedule 13G for IIIV signed and filed?

The Schedule 13G is signed on 05/07/2026 by the Chief Compliance Officer. The cover shows the reporting period date of 03/31/2026, reflecting ownership as of that period end in the filing.

Does William Blair report shared voting or dispositive power for IIIV?

No shared power is reported. The filing shows 0 shared voting power and 0 shared dispositive power. All disclosed voting and dispositive authority is reported as sole power in the Schedule 13G excerpt.

What office and citizenship are listed for the filer on the IIIV Schedule 13G?

William Blair Investment Management, LLC lists its principal business address as 150 North Riverside Plaza, Chicago, IL 60606 and its citizenship as Delaware in the Schedule 13G filing.