[Form 4] Ategrity Specialty Insurance Co Holdings Insider Trading Activity

Rhea-AI Filing Summary

Insider purchases increased indirect ownership in Ategrity Specialty Insurance Co Holdings (ASIC). Stuart J. Zimmer and Zimmer Financial Services Group LLC reported purchases on 09/25/2025 and 09/26/2025 totaling 9,920 shares of common stock at weighted-average prices of $19.4469 and $19.4449, respectively. Following these transactions, the reporting persons beneficially own 38,527,411 shares indirectly through Zimmer Financial Services Group LLC, plus 253,330 shares held by trusts. Transactions were signed by an attorney-in-fact on 09/29/2025.

Positive

• Insider purchases totaling 9,920 shares on 09/25-09/26/2025, indicating incremental insider buying.
• Weighted-average purchase prices disclosed ($19.4469 and $19.4449) with footnotes providing price ranges.
• Clear disclosure of indirect ownership through Zimmer Financial Services Group LLC and trusts.

Negative

• None.

Insights

Financial Analyst

TL;DR: Insider purchases of 9,920 shares modestly increased indirect stake; purchases executed at ~ $19.45 per share.

The filing documents two open-market purchases totaling 9,920 shares on 09/25/2025 and 09/26/2025 at weighted-average prices of $19.4469 and $19.4449. Post-transaction beneficial ownership is reported as 38,527,411 shares indirectly, with an additional 253,330 shares held in trusts. The purchases were reported by the principal and by Zimmer Financial Services Group LLC, where Mr. Zimmer is the sole managing member, indicating shared beneficial ownership of the record holdings.

Corporate Governance Expert

TL;DR: Form 4 properly discloses director/10% owner transactions and clarifies indirect ownership via an affiliated entity.

The filing identifies Stuart J. Zimmer as a director and 10% owner and Zimmer Financial Services Group LLC as a reporting 10% owner. Footnotes disclose weighted-average pricing ranges and the relationship between Mr. Zimmer and ZFSG, which is appropriate disclosure for Section 16 purposes. Signatures by an attorney-in-fact are present and dated 09/29/2025, fulfilling execution requirements.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Zimmer Stuart J.

(Last) (First) (Middle)

ATEGRITY SPECIALTY INSURANCE CO HOLDINGS

9 WEST 57TH STREET, 33RD FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Ategrity Specialty Insurance Co Holdings [ ASIC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/25/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/25/2025		P		4,179	A	$19.4469(1)	38,521,670	I	See Footnote(2)
Common Stock	09/26/2025		P		5,741	A	$19.4449(3)	38,527,411	I	See Footnote(2)
Common Stock								253,330	I	By Trusts

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

Zimmer Stuart J.

(Last) (First) (Middle)

ATEGRITY SPECIALTY INSURANCE CO HOLDINGS

9 WEST 57TH STREET, 33RD FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Zimmer Financial Services Group LLC

(Last) (First) (Middle)

ATEGRITY SPECIALTY INSURANCE CO HOLDINGS

9 WEST 57TH STREET, 33RD FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.40 to $19.48, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.

2. Securities held of record by Zimmer Financial Services Group LLC ("ZFSG"). Mr. Zimmer is the sole managing member of ZFSG and therefore may be deemed to share beneficial ownership of the securities held of record by ZFSG.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.20 to $19.57, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote

	/s/ Eric Crespolini, Attorney-in-Fact for Stuart J. Zimmer	09/29/2025
	/s/ Eric Crespolini, Attorney-in-Fact for Zimmer Financial Services Group LLC	09/29/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did Stuart J. Zimmer report on Form 4 for ASIC?

He reported two purchases totaling 9,920 shares of ASIC common stock on 09/25/2025 and 09/26/2025 at weighted-average prices of $19.4469 and $19.4449.

How many ASIC shares does the reporting person beneficially own after these transactions?

Following the reported transactions, the reporting persons beneficially own 38,527,411 shares indirectly, plus 253,330 shares held by trusts.

Why is Zimmer Financial Services Group LLC listed on the Form 4?

Zimmer Financial Services Group LLC is the record owner of certain shares; the filing states Mr. Zimmer is the sole managing member and may be deemed to share beneficial ownership of those securities.

Were prices for the purchases reported precisely?

The form reports weighted-average prices and footnotes disclose that shares were bought across ranges ($19.40–$19.48 and $19.20–$19.57) with commitment to provide detailed breakdowns upon request.

Who signed the Form 4 and when?

The Form 4 was signed by Eric Crespolini, Attorney-in-Fact for both reporting persons on 09/29/2025.