Hanover Insurance Group, Inc. SEC filings THG
Hanover Insurance Group, Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Aug 28, 2017. Its latest annual report, Form ARS, was filed on Mar 26, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 29, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 28, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q/A | Amended quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 10-Q | Quarterly report | Oct 29, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2026 | Oct 28, 2026 |
| 13F-NT | Filing | Aug 12, 2026 | Jun 30, 2026 |
| 10-Q | Quarterly report | Jul 29, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2026 | Jul 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 15, 2026 | Jul 15, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 13, 2026 | May 12, 2026 |
| 13F-NT | Filing | May 13, 2026 | Mar 31, 2026 |
| 10-Q | Quarterly report | Apr 30, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2026 | Apr 29, 2026 |
| ARS | Annual report to shareholders | Mar 26, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 26, 2026 | — |
| DEF 14A | Proxy statement | Mar 26, 2026 | May 12, 2026 |
| 10-K | Annual report | Feb 20, 2026 | Dec 31, 2025 |
| 13F-NT | Filing | Feb 12, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2026 | Feb 3, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 16, 2025 | Dec 16, 2025 |
| 13F-NT | Filing | Nov 10, 2025 | Sep 30, 2025 |
| 10-Q | Quarterly report | Oct 30, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2025 | Oct 29, 2025 |
| 25-NSE | Delisting notice | Oct 15, 2025 | — |
| 8-K |
Current report
New debt, Other events
|
Aug 21, 2025 | Aug 19, 2025 |
| 424B2 | Prospectus | Aug 20, 2025 | — |
| FWP | Free writing prospectus | Aug 19, 2025 | — |
| 424B2 | Prospectus | Aug 19, 2025 | — |
| S-3ASR | Automatic shelf registration | Aug 18, 2025 | — |
| 13F-NT | Filing | Aug 12, 2025 | Jun 30, 2025 |
| 10-Q | Quarterly report | Jul 31, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2025 | Jul 30, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 14, 2025 | May 13, 2025 |
| 13F-NT | Filing | May 14, 2025 | Mar 31, 2025 |
| 10-Q | Quarterly report | May 1, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2025 | Apr 30, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 3, 2025 | Mar 31, 2025 |
| ARS | Annual report to shareholders | Mar 27, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 27, 2025 | — |
| DEF 14A | Proxy statement | Mar 27, 2025 | Mar 27, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 25, 2025 | Feb 25, 2025 |
| 10-K | Annual report | Feb 24, 2025 | Dec 31, 2024 |
| 13F-NT | Filing | Feb 11, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2025 | Feb 4, 2025 |
| 13F-NT | Filing | Nov 12, 2024 | Sep 30, 2024 |
| 10-Q | Quarterly report | Oct 31, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2024 | Oct 30, 2024 |
| 8-K |
Current report
Other events
|
Aug 14, 2024 | Aug 14, 2024 |
| 13F-NT | Filing | Aug 13, 2024 | Jun 30, 2024 |
| S-8 POS | Filing | Aug 6, 2024 | — |
| 10-Q | Quarterly report | Aug 1, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2024 | Jul 31, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 18, 2024 | Jul 18, 2024 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results
|
May 16, 2024 | May 14, 2024 |
| 13F-NT | Filing | May 3, 2024 | Mar 31, 2024 |
| 10-Q | Quarterly report | May 2, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 1, 2024 | May 1, 2024 |
| ARS | Annual report to shareholders | Mar 28, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Mar 28, 2024 | — |
| DEF 14A | Proxy statement | Mar 28, 2024 | May 14, 2024 |
| PRE 14A | Preliminary proxy statement | Mar 15, 2024 | May 14, 2024 |
| 10-K | Annual report | Feb 22, 2024 | Dec 31, 2023 |
| 13F-NT | Filing | Feb 9, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Jan 31, 2024 | Jan 31, 2024 |
| 8-K |
Current report
Officer or director change
|
Dec 7, 2023 | Dec 5, 2023 |
| 13F-NT | Filing | Nov 8, 2023 | Sep 30, 2023 |
| 10-Q | Quarterly report | Nov 2, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 1, 2023 | Nov 1, 2023 |
| 8-K |
Current report
Results of operations
|
Oct 18, 2023 | Oct 18, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Sep 21, 2023 | Sep 19, 2023 |
| 13F-NT | Filing | Aug 10, 2023 | Jun 30, 2023 |
| 10-Q | Quarterly report | Aug 4, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2023 | Aug 2, 2023 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jul 21, 2023 | Jul 21, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 20, 2023 | Jul 20, 2023 |
| S-8 | Employee stock plan registration | Jun 22, 2023 | — |
| 13F-NT | Filing | May 12, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 9, 2023 | May 9, 2023 |
| 10-Q | Quarterly report | May 3, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 2, 2023 | May 2, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 19, 2023 | Apr 19, 2023 |
| 8-K |
Current report
Material agreement
|
Mar 29, 2023 | Mar 24, 2023 |
| ARS | Annual report to shareholders | Mar 24, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Mar 24, 2023 | — |
| DEF 14A | Proxy statement | Mar 24, 2023 | — |
| 10-K | Annual report | Feb 23, 2023 | Dec 31, 2022 |
| 13F-NT | Filing | Feb 9, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 2, 2023 | Feb 1, 2023 |
| 8-K |
Current report
Results of operations
|
Jan 19, 2023 | Jan 19, 2023 |
| 13F-NT | Filing | Nov 4, 2022 | Sep 30, 2022 |
| 10-Q | Quarterly report | Nov 2, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2022 | Nov 1, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 20, 2022 | Oct 20, 2022 |
| 10-Q | Quarterly report | Aug 3, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2022 | Aug 2, 2022 |
| 13F-NT | Filing | Jul 29, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Officer or director change
|
Jul 19, 2022 | Jul 19, 2022 |
| 8-K |
Current report
Officer or director change
|
Jun 13, 2022 | Jun 13, 2022 |
| S-8 | Employee stock plan registration | May 12, 2022 | — |
| 13F-NT | Filing | May 11, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Shareholder vote results
|
May 11, 2022 | May 10, 2022 |
| 10-Q | Quarterly report | May 4, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 3, 2022 | May 3, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 28, 2022 | Mar 28, 2022 |
| DEFA14A | Additional proxy material | Mar 25, 2022 | — |
| DEF 14A | Proxy statement | Mar 25, 2022 | May 10, 2022 |
| 10-K | Annual report | Feb 25, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Officer or director change
|
Feb 9, 2022 | Feb 8, 2022 |
| 13F-NT | Filing | Feb 7, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 2, 2022 | Feb 2, 2022 |
| 13F-NT | Filing | Nov 4, 2021 | Sep 30, 2021 |
| 10-Q | Quarterly report | Oct 28, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 27, 2021 | Oct 27, 2021 |
| 8-K |
Current report
Results of operations
|
Sep 22, 2021 | Sep 22, 2021 |
| 13F-NT | Filing | Aug 11, 2021 | Jun 30, 2021 |
| 10-Q | Quarterly report | Jul 28, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2021 | Jul 27, 2021 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 11, 2021 | May 11, 2021 |
| 13F-NT | Filing | May 10, 2021 | Mar 31, 2021 |
| 10-Q | Quarterly report | Apr 30, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2021 | Apr 29, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 15, 2021 | Apr 15, 2021 |
| DEFA14A | Additional proxy material | Mar 26, 2021 | — |
| DEF 14A | Proxy statement | Mar 26, 2021 | May 11, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2021 | Feb 26, 2021 |
| 10-K | Annual report | Feb 24, 2021 | Dec 31, 2020 |
| 13F-NT | Filing | Feb 16, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2021 | Feb 3, 2021 |
| 13F-NT | Filing | Nov 12, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 29, 2020 | Oct 27, 2020 |
| 10-Q | Quarterly report | Oct 28, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 27, 2020 | Oct 27, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 13, 2020 | Oct 13, 2020 |
| 25-NSE | Delisting notice | Sep 22, 2020 | — |
| 8-K |
Current report
Officer or director change
|
Sep 1, 2020 | Aug 31, 2020 |
| 8-K |
Current report
New debt, Other events
|
Aug 24, 2020 | Aug 19, 2020 |
| 424B2 | Prospectus | Aug 20, 2020 | — |
| 8-K |
Current report
Other events
|
Aug 20, 2020 | Aug 20, 2020 |
| FWP | Free writing prospectus | Aug 19, 2020 | — |
| 305B2 | Filing | Aug 19, 2020 | — |
| 424B2 | Prospectus | Aug 19, 2020 | — |
| S-3ASR | Automatic shelf registration | Aug 17, 2020 | — |
| 13F-NT | Filing | Aug 13, 2020 | Jun 30, 2020 |
| UPLOAD | Letter from the SEC | Jul 31, 2020 | — |
| CORRESP | Letter to the SEC | Jul 30, 2020 | — |
| 10-Q | Quarterly report | Jul 29, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2020 | Jul 28, 2020 |
| UPLOAD | Letter from the SEC | Jul 16, 2020 | — |
| 8-K |
Current report
Results of operations
|
Jul 14, 2020 | Jul 14, 2020 |
| 13F-NT | Filing | May 14, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Shareholder vote results
|
May 14, 2020 | May 12, 2020 |
| 10-Q | Quarterly report | Apr 29, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2020 | Apr 28, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 17, 2020 | Apr 17, 2020 |
| DEFA14A | Additional proxy material | Apr 17, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 10, 2020 | Apr 10, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 27, 2020 | Mar 26, 2020 |
| DEFA14A | Additional proxy material | Mar 27, 2020 | — |
| DEF 14A | Proxy statement | Mar 27, 2020 | May 12, 2020 |
| 10-K | Annual report | Feb 24, 2020 | Dec 31, 2019 |
| 13F-NT | Filing | Feb 12, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2020 | Feb 4, 2020 |
| 8-K |
Current report
Results of operations
|
Jan 16, 2020 | Jan 16, 2020 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Dec 6, 2019 | Dec 5, 2019 |
| 13F-NT | Filing | Nov 12, 2019 | Sep 30, 2019 |
| 10-Q | Quarterly report | Oct 31, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2019 | Oct 30, 2019 |
| 13F-NT | Filing | Aug 7, 2019 | Jun 30, 2019 |
| 10-Q | Quarterly report | Aug 1, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2019 | Jul 31, 2019 |
| 8-K |
Current report
Material agreement, New debt, Officer or director change, Other events
|
Jul 1, 2019 | Jun 25, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 16, 2019 | May 14, 2019 |
| 13F-NT | Filing | May 7, 2019 | Mar 31, 2019 |
| 10-Q | Quarterly report | May 2, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
May 1, 2019 | May 1, 2019 |
| DEFA14A | Additional proxy material | Mar 28, 2019 | — |
| DEF 14A | Proxy statement | Mar 28, 2019 | May 14, 2019 |
| IRANNOTICE | Filing | Feb 22, 2019 | — |
| 10-K | Annual report | Feb 22, 2019 | Dec 31, 2018 |
| 13F-NT | Filing | Feb 13, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations
|
Jan 31, 2019 | Jan 30, 2019 |
| 8-K |
Current report
Other events
|
Jan 15, 2019 | Jan 15, 2019 |
| 8-K |
Current report
Material agreement, Agreement ended, Acquisition or sale of assets, New debt, Other events
|
Jan 3, 2019 | Dec 28, 2018 |
| 13F-NT | Filing | Nov 8, 2018 | Sep 30, 2018 |
| IRANNOTICE | Filing | Nov 1, 2018 | — |
| 10-Q | Quarterly report | Nov 1, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2018 | Oct 31, 2018 |
| 8-K |
Current report
Officer or director change
|
Sep 17, 2018 | Sep 17, 2018 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Sep 13, 2018 | Sep 13, 2018 |
| 13F-NT | Filing | Aug 9, 2018 | Jun 30, 2018 |
| IRANNOTICE | Filing | Aug 6, 2018 | — |
| 10-Q | Quarterly report | Aug 3, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2018 | Aug 1, 2018 |
| 8-K |
Current report
Shareholder vote results
|
May 16, 2018 | May 15, 2018 |
| 13F-NT | Filing | May 9, 2018 | Mar 31, 2018 |
| IRANNOTICE | Filing | May 3, 2018 | — |
| 10-Q | Quarterly report | May 3, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Results of operations
|
May 2, 2018 | May 2, 2018 |
| 8-K |
Current report
Other events
|
Apr 16, 2018 | Apr 16, 2018 |
| 8-K |
Current report
Other events
|
Mar 29, 2018 | Mar 28, 2018 |
| DEFA14A | Additional proxy material | Mar 28, 2018 | — |
| DEF 14A | Proxy statement | Mar 28, 2018 | May 15, 2018 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Fire, Marine & Casualty Insurance (SIC 6331)
- Listed as
- THG (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Worcester, MA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 944695
- Former names
- ALLMERICA FINANCIAL CORP (until Nov 14, 2005)
Other Fire, Marine & Casualty Insurance companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.