# EDGAR Filing Document

**Accession Number:** 0000944695
**File Stem:** 0002132659-26-000004
**Filing Date:** 2026-5
**Character Count:** 11368
**Document Hash:** 908693413639c4c89c45af834f34904a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002132659-26-000004.hdr.sgml**: 20260513

**ACCESSION NUMBER**: 0002132659-26-000004

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260513

**FILED AS OF DATE**: 20260513

**DATE AS OF CHANGE**: 20260513

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Norton-Gatto Patricia A.
- **CENTRAL INDEX KEY:** 0002132659

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-13754
- **FILM NUMBER:** 26973318

**MAIL ADDRESS:**
- **STREET 1:** 440 LINCOLN STREET
- **CITY:** WORCESTER
- **STATE:** MA
- **ZIP:** 01653
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** HANOVER INSURANCE GROUP, INC.
- **CENTRAL INDEX KEY:** 0000944695
- **STANDARD INDUSTRIAL CLASSIFICATION:** FIRE, MARINE & CASUALTY INSURANCE [6331]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 043263626
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 440 LINCOLN ST
- **CITY:** WORCESTER
- **STATE:** MA
- **ZIP:** 01653
- **BUSINESS PHONE:** 5088551000

**MAIL ADDRESS:**
- **STREET 1:** 440 LINCOLN ST
- **CITY:** WORCESTER
- **STATE:** MA
- **ZIP:** 01653

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLMERICA FINANCIAL CORP
- **DATE OF NAME CHANGE:** 19950501

## Ex-24.Poa

POWER OF ATTORNEY

The undersigned hereby makes, constitutes and appoints each of Dennis F. Kerrigan, Walter H. Stowell, Tonya K. Cahill, Lindsay L. Katz and Julie Solomon, or any one of them acting singly, and with full power of substitution, re-substitution and delegation, the undersigned's true and lawful attorney in fact (each of such persons and their substitutes and delegees being referred to herein as the "Attorney-in-Fact"), with full power to act for the undersigned and in the undersigned's name, place and stead, in the undersigned's capacity as an officer, director or stockholder of The Hanover Insurance Group, Inc. (the "Company"), to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.Execute and file on the undersigned's behalf, individually and in the undersigned's capacity as a trustee for various family trusts, all Forms 3, 4 and 5 (including any amendments thereto) that the undersigned may be required to file with the U.S. Securities and Exchange Commission ("SEC") utilizing the SEC's Electronic Data Gathering and Retrieval ("EDGAR") system, which actions may include (a) enrolling the undersigned in EDGAR Next and (b) preparing, executing and submitting to the SEC a Form ID, amendments thereto, and such other documents and information as may be necessary or appropriate to obtain codes and passwords enabling the undersigned to make filings and submissions utilizing the EDGAR system;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.Submit and file SEC Filings with the SEC utilizing the EDGAR system or cause them to be submitted and filed by a person appointed under <u>Section 4</u> below;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.File, submit or otherwise deliver SEC Filings to any securities exchange on which the Company's securities may be listed or traded;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.Act as an account administrator for the undersigned's EDGAR account, including: (i) appoint, remove and replace account administrators, account users, technical administrators and delegated entities; (ii) maintain the security of the undersigned's EDGAR account, including modification of access codes; (iii) maintain, modify and certify the accuracy of information on the undersigned's EDGAR account dashboard; (iv) act as the EDGAR point of contact with respect to the undersigned's EDGAR account; and (v) any other actions contemplated by Rule 10 of Regulation S-T with respect to account administrators;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.Cause the Company to accept a delegation of authority from any of the undersigned's EDGAR account administrators and, pursuant to that delegation, authorize the Company's EDGAR account administrators to appoint, remove or replace users for the undersigned's EDGAR account; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.Obtain, as the undersigned's representative and on the undersigned's behalf, information regarding transactions in the Company's equity securities from any third party, including the Company and any brokers, dealers, employee benefit plan administrators and trustees, and the undersigned hereby authorizes any such third party to release any such information to the Attorney-in-Fact.

------

The undersigned acknowledges that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a.This Power of Attorney authorizes, but does not require, the Attorney-in-Fact to act in his or her discretion on information provided to such Attorney-in-Fact without independent verification of such information;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b.Any documents prepared or executed by the Attorney-in-Fact on behalf of the undersigned pursuant to this Power of Attorney will be in such form and will contain such information as the Attorney-in-Fact, in his or her discretion, deems necessary or desirable;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c.Neither the Company nor the Attorney-in-Fact assumes any liability for the undersigned's responsibility to comply with the requirements of Section 13 or Section 16 of the Exchange Act or Rule 144, any liability of the undersigned for any failure to comply with such requirements, or any liability of the undersigned for disgorgement of profits under Section 16(b) of the Exchange Act; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d.This Power of Attorney does not relieve the undersigned from responsibility for compliance with the undersigned's obligations under Section 13 or Section 16 of the Exchange Act, including, without limitation, the reporting requirements under Section 13 or Section 16 of the Exchange Act.

The undersigned hereby grants to the Attorney-in-Fact full power and authority to do and perform each and every act and thing requisite, necessary or advisable to be done in connection with the foregoing, as fully, to all intents and purposes, as the undersigned might or could do in person, hereby ratifying and confirming all that the Attorney-in-Fact, or his or her substitute or substitutes, shall lawfully do or cause to be done by authority of this Power of Attorney.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with regard to the undersigned's ownership of or transactions in the securities of the Company, unless earlier revoked in writing.

------

IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney as of April 29, 2026.

<u>/s/ Patricia A. Norton-Gatto</u> 

Patricia A. Norton-Gatto

**NOTARIZATION**

State of Massachusetts

County of Worcester

This Power of Attorney was acknowledged before me on April 29, 2026, by

Patricia A. Norton-Gatto.

 <u>/s/ Kelly Kemp</u> 

Notary Signature

Notary Public

COMMONWEALTH OF MASSACHUSETTS

My Commission Expires July 3, 2031

------

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] 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**<sup>*</sup><br>Norton-Gatto Patricia A.<br><sub>(Last) (First) (Middle)</sub><br>440 LINCOLN STREET<br><sub>(Street)</sub><br>WORCESTER, MA 01653<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>HANOVER INSURANCE GROUP, INC. [ THG ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-05-13 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_SVP & Princpl. Accntg. Officer_ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 2440.302<sup>(1)</sup> | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Common Stock Option (right to buy) | <sup>(2)</sup> | 2035-02-25 | Common Stock | 920 | $161.82 | D |  |
| Common Stock Option (right to buy) | <sup>(3)</sup> | 2036-02-24 | Common Stock | 963 | $173.56 | D |  |

---

### Footnotes:

(1) Includes 470.322 restricted stock units ("RSUs") and underlying dividend equivalent rights granted on 2/27/24, 412.714 RSUs and underlying dividend equivalent rights granted on 2/25/2025, and 406.266 RSUs and underlying dividend equivalent rights granted on 2/24/2026. Each grant of RSUs and the underlying dividend equivalent rights vest on the third anniversary of each applicable grant date.

(2) Such options were granted on 2/25/25 and vest as to one-third of the shares on each of the first three anniversaries of the grant date. The first 1/3 vested on 2/25/2026.

(3) Such options were granted on 2/24/26 and vest as to one-third of the shares on each of the first three anniversaries of the grant date.

**Remarks:**
Exhibit 24 - Power of Attorney

**Signature:** /s/ Lindsay L. Katz, Attorney-in-Fact  
**Date:** 2026-05-13

### Remarks:

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.**