Driehaus reports 560,207 shares of Andersen Group (ANDG) on amended 13G/A

Rhea-AI Filing Summary

Andersen Group Inc. ownership update: Driehaus Capital Management LLC reports beneficial ownership of 560,207 shares of Class A Common Stock, representing 4.43% of the class as of 03/31/2026. The filing is an amendment to a prior Schedule 13G and is signed on 05/15/2026.

The filing shows shared voting and dispositive power over the reported shares (560,207). The schedule is filed under Section 13 and confirms ownership of 5% or less of the class.

Insights

Institutional Ownership Analyst

Large passive holder reports a sub-5% position.

Driehaus Capital Management LLC discloses 560,207 shares held in Class A Common Stock, a 4.43% stake as of 03/31/2026. The position is reported on an amended Schedule 13G, which typically indicates passive investment intent.

Implications depend on voting coordination and future filings; subsequent amendments or a Schedule 13D would signal activist intentions. Future disclosures may show changes in voting or disposition authority.

Compliance & Regulatory Counsel

Amendment clarifies reported holdings and powers.

The amendment lists shared voting power and shared dispositive power of 560,207 shares and attests to ownership below the 5% threshold. The signature block shows the filing was signed by General Counsel on 05/15/2026.

Filing content aligns with Schedule 13G/A procedures; any material change in intent or >5% ownership would require amended disclosure under applicable rules.

Key Figures

Beneficially owned: 560,207 shares Percent of class: 4.43% Signature date: 05/15/2026

3 metrics

Beneficially owned 560,207 shares Class A Common Stock as of 03/31/2026

Percent of class 4.43% Percentage of Class A Common Stock

Signature date 05/15/2026 Amendment signed by General Counsel

Key Terms

Schedule 13G/A, Beneficially owned, Shared dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 ) And indicates passive investor reporting"

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.

Beneficially owned financial

"Amount beneficially owned: 560207"

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.

Shared dispositive power financial

"Shared Dispositive Power 560,207.00"

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

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Accepted by SEC EDGAR 05/15/2026 - 07:04 AM Learn about SEC filing dates

FAQ

How many Andersen Group (ANDG) shares does Driehaus report owning?

Driehaus reports owning 560,207 shares of Andersen Group Class A Common Stock. This stake is disclosed as 4.43% of the class as of 03/31/2026, per the amended Schedule 13G/A.

Does the filing show who controls voting of ANDG shares?

The filing indicates shared voting power and shared dispositive power over 560,207 shares. It lists zero sole voting or dispositive power, indicating control is exercised jointly rather than individually.

Is Driehaus an activist in Andersen Group (ANDG) per this filing?

No activist intent is stated; the Schedule 13G/A format and wording typically reflect a passive investor. The amendment reports holdings and shared powers but does not disclose activist intentions or plans to seek control.

When was the Andersen Group (ANDG) ownership information signed?

The amendment is signed by Janet McWilliams, General Counsel, on 05/15/2026. The reported beneficial ownership amount carries an "as of" date of 03/31/2026 in the filing.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Andersen Group Inc.

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

033853102

(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): 033853102

1

Names of Reporting Persons

DRIEHAUS CAPITAL 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 0.00
6	Shared Voting Power 560,207.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 560,207.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

560,207.00

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)

4.43 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Andersen Group Inc.
(b)	Address of issuer's principal executive offices: 333 Bush Street, Suite 1700, San Francisco, California, 94104
Item 2.
(a)	Name of person filing: Driehaus Capital Management LLC
(b)	Address or principal business office or, if none, residence: 25 East Erie Street, Chicago, Illinois 60611
(c)	Citizenship: USA
(d)	Title of class of securities: Class A Common Stock
(e)	CUSIP No.: 033853102
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: 560207
(b)	Percent of class: 4.43 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 560207
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 560207
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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.

DRIEHAUS CAPITAL MANAGEMENT LLC

Signature:	Janet McWilliams
Name/Title:	Janet McWilliams/General Counsel
Date:	05/15/2026